WO2022178391A1 - Procédé permettant de fabriquer de la pâte blanchie, matière première et système de conditionnement - Google Patents

Procédé permettant de fabriquer de la pâte blanchie, matière première et système de conditionnement Download PDF

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Publication number
WO2022178391A1
WO2022178391A1 PCT/US2022/017238 US2022017238W WO2022178391A1 WO 2022178391 A1 WO2022178391 A1 WO 2022178391A1 US 2022017238 W US2022017238 W US 2022017238W WO 2022178391 A1 WO2022178391 A1 WO 2022178391A1
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WO
WIPO (PCT)
Prior art keywords
paper
feedstock
packaging
cooking liquor
paper material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2022/017238
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English (en)
Inventor
Fritz G. Paulsen
Yao P. NTIFAFA
John D. DEJARNETTE
Maria H. SZAJDA-LAM
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WestRock MWV LLC
Original Assignee
WestRock MWV LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WestRock MWV LLC filed Critical WestRock MWV LLC
Publication of WO2022178391A1 publication Critical patent/WO2022178391A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/12—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds
    • D21C9/14—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites
    • D21C9/144—Bleaching ; Apparatus therefor with halogens or halogen-containing compounds with ClO2 or chlorites with ClO2/Cl2 and other bleaching agents in a multistage process
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/12—Combustion of pulp liquors
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • D21C5/022—Chemicals therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1084—Bleaching ; Apparatus therefor with reducing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides

Definitions

  • the present application relates to the manufacture of pulp from feedstock paper, and, in particular, manufacturing pulp from OCC materials.
  • bleached pulp is manufactured by bleaching of virgin pulp ob tained by chemical pulping of wood chips.
  • Bleached chemical pulp is used to manufacture vari ous paper products, which are used in a wide variety of applications.
  • paperboard manufactured from bleached chemical pulp is commonly used for various packaging applica tions, such as packaging for food (e.g., cartons) and packaging for beverages (e.g., cups).
  • packaging for food e.g., cartons
  • packaging for beverages e.g., cups
  • Recycled pulp suitable for manufacturing of bleached paper products may be obtained from repulping of bleached paper products.
  • Recycled pulp is recovered from unbleached paper products or mixtures of bleached or unbleached paper products, such as old corrugated containers (OCC) materials.
  • OCC materials are delivered to paper processors where they are processed using traditional OCC recycling processes to yield free fibers, which are processed into different paper products such as recycled paperboard, the center fluting of corrugated boxes, and as unbleached kraft paperboard.
  • the continued growth of e-commerce has resulted in more home deliveries in corrugated con tainers, and, thus, increased generation of OCC materials.
  • Traditional recycling of OCC materials is straightforward if non-paper material is re moved from the OCC materials prior to collection.
  • a method for manufacturing bleached pulp from a feedstock includ ing feedstock paper and non-paper material in which the feedstock paper includes lignin and cel lulose, includes: cooking the feedstock in cooking liquor to dissolve at least a portion of the lig nin from the feedstock paper and to at least partially dissolve the non-paper material in the cook ing liquor, thereby yielding a cooked pulp; washing the cooked pulp to yield washed pulp and spent cooking liquor; regenerating the spent cooking liquor to yield regenerated cooking liquor; and bleaching the washed pulp.
  • a method for manufacturing bleached pulp from a feedstock in cluding feedstock paper and non-paper material, in which the feedstock paper includes lignin and cellulose includes: cooking the feedstock in cooking liquor to dissolve at least a portion of the lignin from the feedstock paper and to substantially fully dissolve the non-paper material in the cooking liquor, thereby yielding a cooked pulp; washing the cooked pulp to yield washed pulp and spent cooking liquor; regenerating the spent cooking liquor to yield regenerated cooking liq uor; and bleaching the washed pulp.
  • a feedstock for manufacturing bleached pulp includes feedstock paper and non-paper material intermixed with the feedstock paper. The non-paper material is ca pable of dissolving, at least partially, in a cooking liquor.
  • a feedstock for manufacturing bleached pulp includes feedstock paper and non-paper material intermixed with the feedstock paper.
  • the non-paper material is ca pable of substantially fully dissolving in a cooking liquor.
  • a packaging system in another embodiment, includes a corrugated package and a non paper packaging material capable of dissolving, at least partially, in a cooking liquor.
  • a packaging system includes a corrugated package and a non-paper packaging material capable of substantially fully dissolving in a cooking liquor.
  • Fig. 1 is an exemplary method of manufacturing of manufacturing bleached pulp ac cording to an aspect of the present description.
  • FIG. 2 is a schematic illustration of a packaging system according to an aspect of the present description, in an unsealed state.
  • FIG. 3 is a schematic illustration of the packaging system of Fig. 2 in a sealed state.
  • Fig. 1 is an exemplary method of manufacturing of manufacturing bleached pulp ac cording to an aspect of the present description.
  • the present disclosure relates to a novel feedstock 10 comprising feedstock paper 11 and non-paper material 12 intermixed with the feedstock paper 11, wherein the non-paper mate rial 12 is capable of dissolving, at least partially, if not substantially fully, in a cooking liquor.
  • paper refers to any material formed from pressed/laid fibers of cellulosic pulp and includes paperboard.
  • the feedstock paper 11 includes lignin 13 and cellulose 14.
  • the feedstock paper 11 may have a relatively high quantity of lignin 13.
  • a feedstock paper 11 useful in the disclosed methods may have, on average, a kappa number of at least 60.
  • a feedstock paper 11 useful in the disclosed methods may have, on average, a kappa number of at least 70.
  • a feedstock paper 11 useful in the disclosed methods may have, on average, a kappa number of at least 80.
  • a feedstock paper 11 useful in the disclosed methods may have, on average, a kappa number of at least 90.
  • a feedstock paper 11 useful in the disclosed methods may have, on average, a kappa number of at least 100. In yet another expression, a feedstock paper 11 useful in the disclosed methods may have, on average, a kappa number of at least 110. In yet another expression, a feed stock paper 11 useful in the disclosed methods may have, on average, a kappa number of at least 120
  • the non-paper material 12 includes any non-paper material 12 capable of dissolving, at least partially, in a cooking liquor, which is a chemical solution employed to reduce wood chips (or, in the case of the present disclosure, feedstock paper) into cellulose fiber by dissolving lig nin.
  • the cooking liquor may be a kraft cooking liquor, and may include sodium hydroxide (NaOH) and sodium sulfide (Na2S) among other possible components.
  • the cooking liquor may use other types of cooking chemis tries (soda, sulfite, green liquor, and carbonate).
  • the non-paper material 12 is capable of substantially fully dissolving in the cooking liquor.
  • the non-paper material 12 may be about 100 percent soluble in the cooking liquor.
  • the non-paper material 12 at least partially dissolves in the cook ing liquor.
  • the non-paper material 12 may be at least 50 percent (by weight) sol uble in the cooking liquor.
  • the non-paper material 12 may be at least 60 per cent (by weight) soluble in the cooking liquor.
  • the non-paper material 12 may be at least 70 percent (by weight) soluble in the cooking liquor.
  • the non-paper material 12 may be at least 80 percent (by weight) soluble in the cooking liquor.
  • the non-paper material 12 may be at least 85 percent (by weight) soluble in the cooking liquor.
  • the non-paper material 12 may be at least 90 percent (by weight) soluble in the cooking liquor.
  • the non-paper material 12 may be at least 95 percent (by weight) soluble in the cooking liquor.
  • the non-paper material 12 may be at least 98 percent (by weight) soluble in the cooking liquor.
  • the non-paper material 12 has a positive gross heating value in the dis solved state when dissolved within the cooking liquor.
  • the non-paper material 12 contributes to a regeneration process for regenerating a spent cooking liquor 30 to yield regenerated cooking liquor 20 using the positive heating value of the non-paper material 12.
  • the heating value in the dissolved state may be determined by comparing a heating value of a spent cooking liquor 20 with the dissolved non-paper material 12 with a heating value of a spent cooking liquor 20 with out the dissolved non-paper material 12.
  • the non-paper material 12 has a positive gross heating value in the dissolved state when dissolved within the cooking liquor. In one particular implementation, the non-paper material 12 has a high positive gross heating value in the dis solved state when dissolved within the cooking liquor. As one example, the non-paper material 12 may increase the heating value of the spent cooking liquor by at least 0.01 kJ per gram of the solid content of the non-paper material 12. In another example, the non-paper material 12 may increase the heating value of the spent cooking liquor by at least 0.1 kJ/g.
  • the non-paper material 12 may increase the heating value of the spent cooking liquor by at least 1 kJ/g. In yet another implementation, the non-paper material 12 may increase the heating value of the spent cooking liquor by at least 10 kJ/g.
  • Exemplary suitable non-paper material 12 capable of dissolving, at least partially, in the cooking liquor includes organic or inorganic non-paper material 12 capable of dissolving in the cooking liquor.
  • Suitable non-paper material 12 may include, for example, acrylic, ethylene vinyl acetate, epoxy resins, fiberglass, isocyanate, isoprene, polyethylene glycol, polyethylene oxide, polyvinyl acetate, polyvinyl chloride, propionates, silicone, starch, stearic acid monoglycerides, and styrene acrylic.
  • the non-paper material 12 capable of dissolving, at least partially, in the cooking liquor may be a bio-based non-paper material.
  • Bio-based materials are materials composed in whole or in significant part of biological products.
  • Suitable bio-based non-paper material 12 may include, for example, starch.
  • the non-paper material 12 may take the form of various contaminants within the feed stock paper 11.
  • the non-paper material 12 capable of dissolving, at least partially, in the cooking liquor may take the form of packaging material, such as adhesive, adhesive tapes, air pillows, bubble wrap, cold packs, packaging foam, packaging peanuts, plastic wrap, printing la bels, RFID tags, or any other material employed in the packaging of a product for shipping.
  • the non-paper material 12 may serve a variety of functions.
  • the non-paper material 12 capable of dissolving, at least partially, in the cooking liquor may include paper material that does not dis solve in the cooking liquor.
  • First exemplary non-paper material 12 in the form of packaging material may serve the function of bonding a package together.
  • the non-paper material 12 in the form of packaging ma terial may be bonded between two opposing faces of feedstock papers.
  • first ex emplary non-paper material in the form of packaging material may include adhesive capable of dissolving, at least partially, in the cooking liquor.
  • first exemplary non-paper material in the form of packaging material may include adhesive tapes (e.g., standard or fiber- reinforced) capable of dissolving, at least partially, in the cooking liquor.
  • Second exemplary non-paper material 12 may serve the function of sealing a package.
  • the non-paper material 12 in the form of packaging material may be sealing between two oppos ing ends of feedstock papers.
  • second exemplary non-paper material 12 in the form of packaging material may include adhesive tapes (e.g., standard or fiber-reinforced) capa ble of dissolving, at least partially, in the cooking liquor.
  • Third exemplary non-paper material 12 in the form of packaging material may serve the function of adhering to the outside or inside the package, such as for identification purposes.
  • the non-paper material 12 in the form of packaging material may be adhered to a surface of a feed stock paper.
  • third exemplary non-paper material 12 in the form of packaging ma terial may include printing labels capable of dissolving, at least partially, in the cooking liquor.
  • third exemplary non-paper material 12 in the form of packaging material may include RFID tags capable of dissolving, at least partially, in the cooking liquor.
  • Fourth exemplary non-paper material 12 in the form of packaging material may serve the function of protecting a product contained within the package.
  • the non-paper material 12 in the form of packaging material may be unattached to any feedstock paper.
  • fourth exemplary non-paper material 12 in the form of packaging material may include air pillows ca pable of dissolving, at least partially, in the cooking liquor.
  • fourth exemplary non-paper material 12 in the form of packaging material may include cold packs capable of dis solving, at least partially, in the cooking liquor.
  • fourth exemplary non paper material 12 in the form of packaging material may include packaging foam capable of dis solving, at least partially, in the cooking liquor.
  • fourth exemplary non paper material 12 in the form of packaging material may include packaging peanuts capable of dissolving, at least partially, in the cooking liquor.
  • fourth exemplary non-paper material 12 in the form of packaging material may include plastic wrap capable of dis solving, at least partially, in the cooking liquor.
  • the feedstock paper 11 may contain various contaminates, such as adhesive, adhesive tapes (e.g., standard or fiber-reinforced), air pillows, bubble wrap, cold packs, packaging foam, packaging peanuts, plastic wrap, printing labels, RFID tags, and other non-paper packaging materials.
  • non-paper material 12 e.g., contaminants
  • non-paper material 12 is formed from non-paper material 12 capable of dissolving, at least partially, in the cooking liquor.
  • the feedstock 10 of the present disclosure may be utilized in the methods of the present disclosure without necessitating separation of non-paper material 12 prior to conversion of the feedstock paper 11 into bleached recycled pulp.
  • the non-paper material 12 capable of dissolving, at least partially, in the cooking liquor may include paper material that does not dissolve in the cooking liquor, but the paper material within the non-paper material 12 may be repulped with the feedstock papers.
  • a fiber-reinforced adhesive tapes may include cellulosic fibers that reinforce the adhesive tape. The cellulosic fibers may not dissolve in the cooking liquor. However, the cellulosic fibers may be pulped to manufacture the recycled bleached pulp.
  • a printing label may in clude paper material and non-paper material 12 capable of dissolving, at least partially, in the cooking liquor. The paper material may not dissolve in the cooking liquor. However, the paper material may be pulped to manufacture the recycled bleached pulp.
  • the feedstock 10 of the present disclosure excludes substantial amounts of other solid materials that do not dissolve in the cooking liquor.
  • at least 90 weight percent of the solids content of the feedstock 10 is the feedstock paper 11 and the non-paper ma terial 12.
  • at least 95 weight percent of the solids content of the feed stock 10 is the feedstock paper 11 and the non-paper material 12.
  • at least 98 weight percent of the solids content of the feedstock 10 is the feedstock paper 11 and the non-paper material 12.
  • at least 99 weight percent of the solids content of the feedstock 10 is the feedstock paper 11 and the non-paper material 12.
  • At least 99.5 weight percent of the solids content of the feedstock 10 is the feedstock paper 11 and the non-paper material 12. In yet another implementation, at least 99.8 weight percent of the solids content of the feedstock 10 is the feedstock paper 11 and the non- paper material 12. In yet another implementation, at least 99.9 weight percent of the solids con tent of the feedstock 10 is the feedstock paper 11 and the non-paper material 12.
  • the feedstock 10 may contain water.
  • the quantity of water in the feedstock may be due to the equilibrium moisture content or may be greater than the equilibrium moisture content.
  • the feedstock may have a solids content of at least 70 percent by weight.
  • the feedstock may have a solids content of at least 75 percent by weight.
  • the feedstock may have a solids content of at least 80 percent by weight.
  • the feedstock may have a solids content of at least 85 percent by weight.
  • the feedstock may have a solids content of at least 90 percent by weight.
  • the feedstock may have a solids content of at least 95 percent by weight.
  • the feedstock 10 may be in the form of a bundle of feedstock paper 11 and non-paper material 12 pressed together into a densified mass.
  • a suita ble feedstock paper 11 may be (or may include) old corrugated containers (OCC), which may be received in bulk (e.g., bales).
  • OCC old corrugated containers
  • An OCC bale is a bundle of old corrugated containers that have been pressed together at a high pressure into densified mass.
  • a typical bale size may be, for ex ample, in a range of from 5 to 100 cubic feet, such as in a range of from 10 to 50 cubic feet.
  • feedstock comprised of a mixture of different types of feedstock paper 11 may be used.
  • suitable feedstock for the disclosed methods include corrugated box plant clippings, kraft bagging, newsprint, and recov ered kraft fibers, double liner kraft (DLK), and paper mill broke (trim rolls or rejected quality rolls).
  • FIG. 1 Illustrated in Fig. 1 is an example of the methods of the present disclosure, generally designated 100, for manufacturing bleached pulp 50 from a feedstock 10 comprising at least feedstock paper 11 and non-paper material 12.
  • the method 100 may include a step of reducing a size of the feedstock 10.
  • the size reduction step (Block 110) may be performed before an impregnation step (Block 120), though variations are contemplated and will not result in a departure from the scope of the pre sent disclosure.
  • Various techniques may be used for reducing the size of (e.g., shredding) the feedstock 10.
  • a hogger may be used to perform the size reduction step (Block 110).
  • a cutter may be used to perform the size reduc tion step (Block 110).
  • a sheer may be used to perform the size reduction step (Block 110).
  • the method 100 may include a step of impregnating the feedstock 10 with cooking liquor 20 prior to a cooking step (Block 130).
  • the cooking liquor 20 may be a kraft cooking liquor, and may include sodium hydroxide (NaOH) and sodium sulfide (Na2S) among other possible components.
  • the cooking liquor 20 may use other types of cooking chemistries (soda, sulfite, green liq uor, and carbonate).
  • the impregnation step (Block 120) may yield an impregnated material 22 having a liq- uor-to-fiber mass ratio.
  • the liquor-to-fiber mass ratio may be at most about 4: 1.
  • the liquor-to-fiber mass ratio may be at most about 3 : 1.
  • the liquor-to-fiber mass ratio may be less than 3 : 1.
  • the liquor-to- fiber mass ratio may be at most about 2.5:1.
  • the liquor-to-fiber mass ratio may be at most about 2: 1.
  • the liquor-to-fiber mass ratio may range from about 1 : 1 to about 3:1.
  • the subsequent cooking step may be referred to as vapor-phase digestion.
  • the present disclosure is not limited to a low liquor-to-fiber mass ratio or to vapor-phase digestion.
  • the cooking liquor 20 used in the impregnation step may contain a percent age of active alkali ions.
  • the percentage of active alkali ions may be about 5 percent by weight of the feedstock 10 to about 10 percent by weight of the feedstock 10.
  • the percentage of active alkali ions may be about 5 percent by weight of the feedstock to about 15 percent by weight of the feedstock.
  • the percentage of active alkali ions may be about 5 percent by weight of the feedstock to about 20 percent by weight of the feedstock.
  • the percentage of active alkali ions may be about 5 percent by weight of the feedstock to about 25 percent by weight of the feedstock.
  • the impregnation step (Block 120) may include the step of compressing the feedstock 10. Without being limited to any particular theory, it is believed that compressing the feedstock 10 aids in the impregnation step (Block 120) and facilitates a more uniform distribution of the cooking liquor 20 throughout the impregnated material 22.
  • the compressing step (Block 122) may be performed by a plug/compression screw feeder, such as an MSD Impressafiner ® , which is commercially availa ble from Andritz AG of Graz, Austria.
  • the compressing step (Block 122) may be performed by a screw press.
  • the com pressing step (Block 122) may be performed by a kneader.
  • the use of multiple different appa ratus (e.g., in series and/or in parallel) for performing the compressing step (Block 122) is also contemplated.
  • the compressing step (Block 122) may be performed on the feedstock 10 to achieve a desired compression ratio.
  • the compressing step (Block 122) may be per formed to achieve a compression ratio greater than 1 : 1, on a volume basis.
  • the compressing step (Block 122) may be performed to achieve a compression ratio of at least about 1.5:1, on a volume basis.
  • the compressing step (Block 122) may be performed to achieve a compression ratio of at least about 2:1, on a volume basis.
  • the compressing step (Block 122) may be performed to achieve a compression ratio of at least about 2.5:1, on a volume basis.
  • the compressing step (Block 122) may be performed to achieve a compression ratio of at least about 3 : 1, on a volume basis. In an other expression, the compressing step (Block 122) may be performed to achieve a compression ratio of at least about 3.5: 1, on a volume basis. In another expression, the compressing step (Block 122) may be performed to achieve a compression ratio of at least about 4: 1, on a volume basis. In yet another expression, the compressing step (Block 122) may be performed to achieve a compression ratio between about 2: 1 and about 4: 1, on a volume basis. [0048] As shown in Block 124, the impregnation step (Block 120) may further include the step of adding a surfactant to the feedstock 10. Without being limited to any particular theory, the ad dition of surfactant may aid in the penetration of cooking liquor 20 into materials.
  • the method 100 includes the step of cooking the impregnated material 22 to dissolve lignin 13 from the feedstock paper 11 and to dissolve, at least partially, the non-paper material 12 into the cooking liquor 20, thereby yielding a cooked pulp 24.
  • the cooking step may be performed in a continuous digester, such as a Pandia-type digester, a Messig & Durkee (M&D-type) digester, a Kamyr-type digester, or the like.
  • a continuous digester such as a Pandia-type digester, a Messig & Durkee (M&D-type) digester, a Kamyr-type digester, or the like.
  • M&D-type Messig & Durkee
  • Kamyr-type digester or the like.
  • the use of a batch digester is also contemplated.
  • the cooking step (Block 130) dissolves lignin 13 from the feedstock paper 11 into the cooking liquor 20.
  • the cooking step (Block 130) may be performed to a kappa number of at most about 40.
  • the cooking step (Block 130) may be per formed to a kappa number of at most about 35.
  • the cooking step (Block 130) may be performed to a kappa number of at most about 33.
  • the cook ing step (Block 130) may be performed to a kappa number of at most about 30.
  • the cooking step (Block 130) may be performed to a kappa number ranging from about 15 to about 40.
  • the cooking step (Block 130) may be performed to a kappa number ranging from about 24 to about 32.
  • the cooking step (Block 130) may be performed at a cooking temperature and the im pregnated material 22 may have a residence time at the cooking temperature.
  • the cooking temperature and the residence time may depend on various factors, such as the chemistry of the cooking liquor 20 and the liquor-to-fiber mass ratio of the impregnated material 22.
  • the cooking liquor 20 is a kraft cooking liquor
  • the cooking temperature may range from about 140 °C and about 170 °C
  • the residence time may range from about 30 minutes to about 90 minutes at the cooking temperature.
  • the non-paper material 12 dis solve, at least partially, into the cooking liquor 20 at the same conditions during which the cook ing step dissolves lignin 13 from the feedstock paper 11 into the cooking liquor 20.
  • the non-paper material 12 dissolves into the cooking liquor 20 more easily than the lignin 13 from the feedstock paper 11 so that the non-paper material 12 is fully dissolved when the desired amount of lignin is removed from the feedstock paper 11.
  • the method 100 may include the step of screening the cooked pulp 24 to remove rejects 136.
  • the rejects 136 may include undissolved material 137, such as undissolved non-paper material 12.
  • the screening step 135 may only be required when the non-paper material 12 is not fully (about 100 percent) soluble in the cooking liquor 20.
  • the method 100 includes the step of washing the cooked pulp 24 to yield washed pulp 26 and spent cooking liquor 30.
  • the washing step may be performed, for example, with water or an aqueous solution, as is well known in the art.
  • the spent cooking liquor 30 is regenerated to yield regenerated cooking liquor 20 using a positive heating value of the dissolved lignin and the dissolved non-cellulosic organic components in the spent cooking liquor 30.
  • the regeneration step, block 150 is not lim ited and may include any method for regenerating a spent cooking liquor 30.
  • the step of regenerating the spent cooking liquor 30 may include, for example, an evaporation step at block 152 and a recovery step at block 154.
  • the method 100 may optionally include the step of blending the cooked pulp 24 (or washed pulp 26, if washed first) with virgin pulp 40 (i.e., pulp not obtained by recy cling) to yield a pulp blend 42.
  • the blending step (Block 160) may be performed prior to the bleaching step (Block 170), though variations (e.g., blending after bleaching) are also contem plated.
  • the pulp blend 42 may contain various quantities of virgin pulp 40 without departing from the scope of the present disclosure.
  • the pulp blend 42 includes about 5 percent by weight to about 95 percent by weight cooked pulp 24 (or washed pulp 26, if washed first), with balance virgin pulp 40.
  • the pulp blend 42 includes about 5 percent by weight to about 85 percent by weight cooked pulp 24 (or washed pulp 26, if washed first), with balance virgin pulp 40.
  • the pulp blend 42 includes about 5 percent by weight to about 75 percent by weight cooked pulp 24 (or washed pulp 26, if washed first), with balance virgin pulp 40.
  • the pulp blend 42 includes about 5 percent by weight to about 65 percent by weight cooked pulp 24 (or washed pulp 26, if washed first), with balance virgin pulp 40. In another non-limiting ex ample, the pulp blend 42 includes about 5 percent by weight to about 50 percent by weight cooked pulp 24 (or washed pulp 26, if washed first), with balance virgin pulp 40. In yet another non-limiting example, the pulp blend 42 includes about 10 percent by weight to about 30 percent by weight cooked pulp 24 (or washed pulp 26, if washed first), with balance virgin pulp 40.
  • the method 100 includes the step of bleaching the cooked pulp 24 (or the washed pulp 26, if washed, or the pulp blend 42, if blended) to yield bleached pulp 50.
  • the bleaching step (Block 170) increases the brightness of the pulp.
  • the bleaching step (Block 170) is performed to achieve a GE brightness of at least about 70 percent.
  • the bleaching step (Block 170) is performed to achieve a GE brightness of at least about 75 percent.
  • the bleaching step (Block 170) is performed to achieve a GE brightness of at least about 80 percent.
  • the bleaching step (Block 170) is performed to achieve a GE brightness of at least about 85 percent.
  • the bleaching step (Block 170) is performed to achieve a GE brightness of at least about 90 per cent.
  • the bleaching step (Block 170) includes traditional chlorine bleaching.
  • the bleaching step (Block 170) includes chlorine dioxide bleach ing.
  • the bleaching step (Block 170) includes peroxide bleach ing.
  • the bleaching step (Block 170) includes oxygen bleaching.
  • the method 100 may include the step of storing the bleached pulp 50 in a storage vessel.
  • the storing step may include storing the bleached pulp in a high-density storage tank.
  • the bleached pulp 50 may be used to manufacture various articles (e.g., paperboard; cups containing paperboard; etc.).
  • the method 100 produces recycled bleached pulp 50, which may be used in a vari ety of applications, such as for manufacturing paper, including paperboard.
  • Fig. 2 is a schematic illustration of a packaging system according to an aspect of the present description, in an unsealed state.
  • Fig. 3 is a schematic illustration of the packaging sys tem of Fig. 2 in a sealed state.
  • the present disclosure relates to a novel packaging system 60 having improved sustain ability.
  • the packaging system 60 comprises a corrugated package 70 and a non-paper packaging material 80 capable of dissolving, at least partially, in a cooking liquor, which is a chemical solu tion employed to reduce wood chips (or, in the case of the present disclosure, feedstock paper) into cellulose fiber by dissolving lignin.
  • the cooking liquor may be a kraft cooking liquor, and may include sodium hydroxide (NaOH) and sodium sulfide (Na2S) among other possible components.
  • the cooking liq uor may use other types of cooking chemistries (soda, sulfite, green liquor, and carbonate).
  • the corrugated package 70 includes a plurality of corrugated walls 71 defining an open ing 72 for placing or removing a product 90 therein.
  • the opening 72 is in the unsealed state be fore placing the product 90 in the corrugated package 70.
  • the opening 72 is in the sealed state after to placing the product 90 in the corrugated package 70 and during transportation of the cor rugated package 70 to a destination.
  • the opening 72 is in the unsealed state after removing the product 90 from the corrugated package 70.
  • the form of the corrugated package 70 is not limited and may include, for example, a corrugated box formed from a single blank of corrugated paper- board, in which corrugated walls 71 are formed by folding the corrugated paperboard, and in which at least one of the walls includes overlapping portions of paperboard, between which are positioned an adhesive or adhesive tape.
  • the non-paper packaging material 80 capable of dissolving, at least partially, in a cook ing liquor may serve a variety of functions with regards to the corrugated package 70.
  • a first exemplary non-paper packaging material 80 may serve the function of bonding the corrugated package 70 together.
  • the first exemplary non-paper packaging material may be bonded between two opposing faces of the corrugated package.
  • the first exemplary non-paper packaging material may include adhesive or adhesive tapes (e.g., standard or fiber-re inforced) capable of dissolving, at least partially, in a cooking liquor.
  • a second exemplary non-paper packaging material may serve the function of sealing the corrugated package 70.
  • the non-paper packaging material may be sealing between two op posing ends of the corrugated package 70.
  • the second exemplary non-paper pack aging material may include adhesive or adhesive tapes (e.g., standard or fiber-reinforced) capa ble of dissolving, at least partially, in a cooking liquor.
  • a third exemplary non-paper packaging material 80 may serve the function of adhering to the outside or inside the corrugated package 70, such as for identification purposes.
  • the non paper packaging material may be adhered to a surface of a corrugated package 70.
  • the third exemplary non-paper packaging material 80 may include a printing label capable of dissolving, at least partially, in a cooking liquor adhered to the outside or inside the corrugated package 70.
  • the third exemplary non-paper packaging material include RFID tag capable of dissolving, at least partially, in a cooking liquor. The RFID tag may be adhered to the outside or inside the corrugated package 70.
  • a fourth exemplary non-paper packaging material 80 may serve the function of protect ing a product 90 contained within the corrugated package 70.
  • the non-paper packaging material 80 may be unattached to any feedstock paper.
  • the fourth exemplary non-paper packaging material include non-paper packaging material capable of dissolving, at least partially, in a cooking liquor contained within the corrugated package 70, such as air pillows capable of dissolving, at least partially, in a cooking liquor, bubble wrap capable of dissolving, at least par tially, in a cooking liquor, cold packs capable of dissolving, at least partially, in a cooking liquor, packaging foam capable of dissolving, at least partially, in a cooking liquor, packaging peanuts capable of dissolving, at least partially, in a cooking liquor, and plastic wrap capable of dissolv ing, at least partially, in a cooking liquor.
  • the fourth exemplary non-paper packaging material may include a paper packing material contained within the corrugated pack age 70, to which an adhesive or adhesive tapes (e.g., standard or fiber-reinforced) is adhered thereto, in which the adhesive or adhesive tape is capable of dissolving, at least partially, in a cooking liquor.
  • an adhesive or adhesive tapes e.g., standard or fiber-reinforced
  • the corrugated package 70 includes lignin and cellulose.
  • the corrugated package 70 may have a relatively high quantity of lignin.
  • the corrugated package 70 may have a kappa number of at least 60.
  • the corrugated package 70 useful in the disclosed methods may have a kappa number of at least 70.
  • the corru gated package 70 useful in the disclosed methods may have a kappa number of at least 80.
  • the corrugated package 70 useful in the disclosed methods may have a kappa number of at least 90.
  • the corrugated package 70 useful in the dis closed methods may have a kappa number of at least 100.
  • the corru gated package 70 useful in the disclosed methods may have a kappa number of at least 110.
  • the corrugated package 70 useful in the disclosed methods may have a kappa number of at least 120.
  • the non-paper packaging material 80 include any non-paper material capable of dis solving, at least partially, in a cooking liquor, which is a chemical solution employed to reduce wood chips (or, in the case of the present disclosure, feedstock paper) into cellulose fiber by dis solving lignin.
  • the cooking liquor may be a kraft cooking liq uor, and may include sodium hydroxide (NaOH) and sodium sulfide (Na2S) among other possi ble components.
  • the cooking liquor may use other types of cooking chemistries (soda, sulfite, green liquor, and carbonate).
  • the non-paper packaging material 80 have a positive gross heat ing value in the dissolved state when dissolved within the cooking liquor.
  • the non-paper packaging material 80 contribute to a regeneration process for regenerating a spent cooking liq uor to yield regenerated cooking liquor using the positive heating value of the non-paper packag ing material 80.
  • the heating value in the dissolved state may be determined by comparing a heat ing value of a spent cooking liquor with the dissolved non-paper packaging material 80 with a heating value of a spent cooking liquor without the dissolved non-paper packaging material 80.
  • the non-paper packaging material 80 has a positive gross heating value in the dissolved state when dissolved within the cooking liquor. In one implementation, the non-paper packaging material 80 has a high positive gross heating value in the dissolved state when dissolved within the cooking liquor. In one example, the non-paper packaging material 80 may increase the heating value of the spent cooking liquor by at least 0.01 kJ per gram of the solid content of the non-paper packaging material 80. In another example, the non-paper packag ing material 80 may increase the heating value of the spent cooking liquor by at least 0.1 kJ/g. In another example, the non-paper packaging material 80 may increase the heating value of the spent cooking liquor by at least 1 kJ/g. In yet another example, the non-paper packaging material 80 may increase the heating value of the spent cooking liquor by at least 10 kJ/g.
  • Exemplary suitable non-paper packaging material 80 include organic or inorganic non paper material 12 capable of dissolving, at least partially, in the cooking liquor.
  • Suitable non-pa per material may include, for example, acrylic, ethylene vinyl acetate, epoxy resins, fiberglass, isocyanate, isoprene, polyethylene glycol, polyethylene oxide, polyvinyl acetate, polyvinyl chlo ride, propionates, silicone, starch, stearic acid monoglycerides, and styrene acrylic.
  • the non-paper packaging material 80 capable of dis solving, at least partially, in the cooking liquor may be a bio-based non-paper material.
  • Bio based materials are materials comprises in whole or significant part of biological products.
  • Suita ble bio-based non-paper material may include, for example, starch.
  • the non-paper packaging material 80 may include paper material that does not dissolve in the cooking liquor, but the paper material within the non-paper packaging material 80 may be repulped.
  • a fiber-reinforced adhesive tapes may include cellulosic fibers that rein force the adhesive tape. The cellulosic fibers may not dissolve in the cooking liquor. However, the cellulosic fibers may be pulped to manufacture the recycled bleached pulp.
  • a printing label may include paper material and non-paper material capable of dissolving in the cooking liquor. The paper material may not dissolve in the cooking liquor. However, the pa per material may be repulped to manufacture the recycled bleached pulp.
  • Example 1 In this example two components from a novel packaging system 60 shown in Fig. 3 were separated into their individual component forms (i.e., corrugated package 70 and a non-pa per packaging material 80) to enable measurement of the residual cooking liquor heating values as a result of alkali digestion.
  • Combined box board packaging as the corrugated package 70 was collected from recycled materials made from traditional linerboard, corrugating medium and starch-based adhesives.
  • the non-paper packaging material 80 was a tape available from 3M as Product R3187. Both components were dry shredded independently for the purpose of the exper iment.
  • each component listed above was digested independently in small la boratory digester reactors at typical kraft pulping conditions using a kraft white liquor mixture of sodium hydroxide and sodium sulfide as the cooking liquor portrayed as 20 in Fig. 1.
  • An 18% alkali charge as active alkali on dry combined board or dry tape was used at 25% sulfidity and cooked to a temperature of 165 degrees centigrade and held at this temperature for about 30 to 35 minutes for each cook.
  • the digester was cooled, and contents removed and washed in the laboratory on a Buchner funnel with clean wash water. From Fig.
  • the remaining separated fiber suspended solids (washed pulp 26) and spent cooking liquor 30 (with dissolved lignin 13) were separated from the Buchner funnel.
  • the washed pulp 26 can be further processed into unbleached paper or subjected to further processing to produce a bleached pulp 50.
  • the cooking liquor 30 was further evaporated and tested for higher heating values on a moisture free dry basis.
  • Table 1 demonstrates the contribution of the packaging material before digestion, the resulting digested pulp, and residual cooking black liquors to the higher heating value on a KJ per oven dried gram solids basis or on a moisture free basis.
  • the as-is columns represent the components total higher heating value on a bone-dry basis before digestion, while the pulp and black liquor columns represent the two component streams after the alkali digestion and the washing separation phase completed.
  • Higher heating values on a fuel solids dry basis were deter mined on an IKA calorimeter C 6000 Isoperibol and the TAPPI method T684 was used to deter mine the heating values of the black liquors.
  • Kappa number of the combined board prior to digestion was about 82.3.
  • the cooking process will both remove product lignin from the medium and linerboard grades, isolate the fiber from the tape backing, and dissolve the non-fibrous adhesive components into the pro cess black liquors for improved heating value.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne une matière première qui comprend un papier à base de matière première et un matériau non papier. Le papier à base de matière première comprend de la lignine et de la cellulose. Un procédé consiste à cuire la matière première dans une liqueur de cuisson pour dissoudre au moins une partie de la lignine à partir du papier à base de matière première et pour dissoudre au moins partiellement le matériau non papier dans la liqueur de cuisson, ce qui permet d'obtenir une pâte cuite. Le procédé consiste en outre à laver la pâte cuite pour produire de la pâte lavée et de la liqueur de cuisson résiduaire, à régénérer de la liqueur de cuisson résiduaire pour produire de la liqueur de cuisson régénérée, et à blanchir la pâte lavée.
PCT/US2022/017238 2021-02-22 2022-02-22 Procédé permettant de fabriquer de la pâte blanchie, matière première et système de conditionnement Ceased WO2022178391A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57167475A (en) * 1981-04-02 1982-10-15 Mitsubishi Paper Mills Ltd Production of bleached pulp from unbleached used paper
EP0557651A1 (fr) * 1992-02-24 1993-09-01 Scott Paper Company Procédé intégré de mise en pâte de vieux papiers, donnant des fibres aptes à faire du tissue
EP0627028A1 (fr) * 1992-02-18 1994-12-07 Domtar Inc Delignification a l'oxygene de dechets a base de papier cellulosique.
WO1994028236A1 (fr) * 1993-05-28 1994-12-08 Ab Klippans Finpappersbruk Procede de production de pate de cellulose
JPH07173439A (ja) * 1993-12-17 1995-07-11 Sekisui Chem Co Ltd クラフト粘着テープ
EP0805231A2 (fr) * 1992-04-06 1997-11-05 Westvaco Corporation Procédé de fabrication de papier et un papier ainsi obtenu

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3440134A (en) * 1965-10-15 1969-04-22 M T Reed Construction Co Method for treating corrugated waste-paper and product produced thereby
US4191610A (en) * 1975-04-09 1980-03-04 Prior Eric S Upgrading waste paper by treatment with sulfite waste liquor
US5147503B1 (en) * 1991-03-01 1997-10-21 Domtar Inc Recycling waste cellulosic material with sodium sulphide digestion
US6017415A (en) * 1997-09-05 2000-01-25 International Paper Company Method for co-pulping waste cellulosic material and wood chips

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57167475A (en) * 1981-04-02 1982-10-15 Mitsubishi Paper Mills Ltd Production of bleached pulp from unbleached used paper
EP0627028A1 (fr) * 1992-02-18 1994-12-07 Domtar Inc Delignification a l'oxygene de dechets a base de papier cellulosique.
EP0557651A1 (fr) * 1992-02-24 1993-09-01 Scott Paper Company Procédé intégré de mise en pâte de vieux papiers, donnant des fibres aptes à faire du tissue
EP0805231A2 (fr) * 1992-04-06 1997-11-05 Westvaco Corporation Procédé de fabrication de papier et un papier ainsi obtenu
WO1994028236A1 (fr) * 1993-05-28 1994-12-08 Ab Klippans Finpappersbruk Procede de production de pate de cellulose
JPH07173439A (ja) * 1993-12-17 1995-07-11 Sekisui Chem Co Ltd クラフト粘着テープ

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