EP0771902A1 - Procédé pour la préparation de papier et de pâte à papier - Google Patents

Procédé pour la préparation de papier et de pâte à papier Download PDF

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Publication number
EP0771902A1
EP0771902A1 EP96116677A EP96116677A EP0771902A1 EP 0771902 A1 EP0771902 A1 EP 0771902A1 EP 96116677 A EP96116677 A EP 96116677A EP 96116677 A EP96116677 A EP 96116677A EP 0771902 A1 EP0771902 A1 EP 0771902A1
Authority
EP
European Patent Office
Prior art keywords
pretreatment
bleaching
agents
pretreatment agent
pulp
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.)
Withdrawn
Application number
EP96116677A
Other languages
German (de)
English (en)
Inventor
Joachim Dr. Grütze
Martin Dr. Riegels
Eckhard Wenderoth
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.)
Bayer AG
Original Assignee
Bayer AG
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
Priority claimed from DE1995140359 external-priority patent/DE19540359A1/de
Priority claimed from DE1995143480 external-priority patent/DE19543480A1/de
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0771902A1 publication Critical patent/EP0771902A1/fr
Withdrawn legal-status Critical Current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
    • D21C9/1026—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
    • D21C9/1005—Pretreatment of the pulp, e.g. degassing the pulp

Definitions

  • the invention relates to a process for the production of paper and pulp by pretreatment with a liquor which, if appropriate in addition to other auxiliaries, contains anionic wetting or dispersing agents, the countercations of which preferably represent 5 to 100 equivalent% of all cations of lithium.
  • Vegetable pulps are subjected to a number of treatment steps in the manufacture of paper and pulp. This includes preparation, bleaching, dyeing and grinding. Pretreatment includes, in particular, the disintegration, grinding and bleaching of the native raw material. This pretreatment is necessary on the one hand in order to remove natural, colored components and thus to increase the whiteness of the subsequent product by removing them. On the other hand, these natural components interfere with the dyeing of brilliant shades, so that a uniform lightening of the substrate to be colored is necessary in order to achieve the desired shade.
  • soluble Mg salts are sometimes used to remove or inhibit metal ions (e.g. Cu, Fe, Mn).
  • the fiber materials are bleached either oxidatively, reductively or in combination, whereby typical formulations contain bleaching agents as well as complexing agents (e.g. EDTA or DTPA) and stabilizers (e.g. water glass).
  • bleaching agents as well as complexing agents (e.g. EDTA or DTPA) and stabilizers (e.g. water glass).
  • complexing agents e.g. EDTA or DTPA
  • stabilizers e.g. water glass.
  • the pretreatment compensates for growth-related, morphological and endogenous material differences of the native cellulose, which on the one hand leads to a higher dye build-up capacity and on the other hand to more uniform semi-fabrics leads, but also to better quality and running properties in downstream manufacturing or finishing processes.
  • No chemical pretreatment is usually carried out in the bleaching processes used for the production of paper and cellulose and in the bleaching of recycled fiber material.
  • the bleaching processes used use oxidizing agents, reducing agents and / or combinations thereof. For above-average requirements, chlorine-containing bleaching agents are preferred.
  • the object of the invention was to maintain or improve the previous bleaching effect in paper and cellulose production in the pretreatment process without having to accept an attack on the fibers. Furthermore, process steps in the pulp production should be optimized, e.g. the bleaching process through higher throughputs.
  • the invention relates to a process for the production of paper and pulp by pretreating natural fibers of plant origin or their mixtures with synthetic fibers with auxiliaries which contain anionic wetting or dispersing agents, bleaching agents and / or bleaching stabilizers and / or surfactants and / or not being used -ionic components are present or absent.
  • a preferred method is characterized in that the cations of the anionic wetting or dispersing agents are 5 to 100 equivalent% of lithium cations. The remaining cations are generally 95 to 0 equivalent% Na + , K + , ammonium, Ca ++ and / or Mg ++ cations.
  • Natural fibers of vegetable origin to be pretreated according to the invention are, for example, wood pulp, wood pulp and cotton, regenerated cellulose, linen, jute, sisal, hemp, other grasses and annual plants, their mixtures with one another or their mixtures with synthetic fibers such as polyamide, polyester or polyacrylonitrile.
  • the natural fiber is present in such mixtures in an amount of 10 to 95% by weight.
  • the natural ones are preferred Fibers of plant origin, especially wood pulp, wood pulp and preferably cotton and their mixtures with the synthetic fibers mentioned, as well as their forms as secondary fiber pulps, for example from recycling processes.
  • Examples of forms of pretreatment are grinding and bleaching, and bleaching in a particularly preferred manner.
  • Anionic wetting agents (I) or dispersing agents (II) to be used according to the invention are preferably phosphates, sulfates, sulfonates, carboxylates or mixtures thereof, in particular their Li salts.
  • the anionic wetting or dispersing agents (I) or (II) are known compounds which can be prepared in a known manner. According to the invention, they are now neutralized at least partially with LiOH, Li 2 CO 3 , LiHCO 3 or other Li salts of weak acids. Due to the manufacturing process, K or ammonium salts before, the free acid of (I) or (II) can be obtained with the aid of an acidic ion exchanger and then neutralized with one of the above-mentioned Li compounds.
  • wetting agents (I) mentioned can be present as a mixture in a pretreatment liquor for the process according to the invention or more than one dispersant (II) can be present, mixtures of substances from group (I) with substances from group (II) can also be present. It is also possible that other cations of Na, K, ammonium, Ca or Mg can also be present in addition to the Li cation. 0.02-5 g, preferably 0.1-2 g of Li cations, of wetting or dispersing agents are preferably present in the pretreatment liquor per 100 g of fiber to be pretreated.
  • Li-containing compounds (I) or (II) can also be formed in the pretreatment liquor from non-Li-containing wetting or dispersing agents and added Li compounds from the group consisting of LiOH, inorganic and organic Li salts .
  • the pretreatment liquors according to the invention contain the alkali salts of (I) and (II), preferably in a total amount of 0.2-20 g / l, preferably 0.5-10 g / l. If there is another cation besides Li + , this is preferably Na + .
  • the pretreatment according to the invention can be carried out in conventional digestion methods e.g. be carried out in the pulper in the form of dispersing bleach, preferably at 20 ° C. to 110 ° C.
  • the duration of the application of the method according to the invention depends on the desired degree of brightness or the pollution.
  • the aim is to shorten the bleaching time with the same bleaching result.
  • the form of pretreatment according to the invention as a bleach is carried out in such a way that a hypochlorite, hydrogen peroxide, another peroxide, a per compound, ozone or mixtures of these compounds are added to the pulp water mixture as the bleaching agent.
  • Hypochlorite in particular hydrogen peroxide, peroxide or a per compound, is preferred.
  • the anionic wetting or dispersing agent (I) or (II) can be used before or during the bleaching.
  • the wetting or dispersing agent (I) or (II) can also be formed only during the pretreatment from non-Li-containing (I) or (II) and added lithium compound, in particular LiOH, inorganic or organic Li salts will.
  • bleach stabilizers Water glass is an example of a bleach stabilizer:
  • the components mentioned can be used both individually and in any mixture with one another to produce the pretreatment liquor to be used according to the invention.
  • the H 2 O 2 bleaching liquor mentioned is preferably supplemented by Li-containing (I) or (II).
  • Dyes were used for the staining, which correspond to the following formulas in the form of the free acid:
  • Red dye of the formula R Red dye of the formula R.
  • the dyes were used in an amount of 1% by weight and 0.5% by weight, based on dry cellulose.
  • Dyeing temperature 20 ° C or 40 ° C, see Table.
  • Example 17 Increasing the Absorbency of Base Papers to Improve Dyeability in Surface Application Processes.
  • Example 18 / Wood pulp bleach
  • An unbleached pulp from cellulose boiling was thickened and bleached in a first bleaching stage with HOCl, O 2 , O 3 or H 2 O 2 .
  • a temperature of 60 to 80 ° C. was set here by adding steam.
  • Mixture I according to Example 1 was then added in an amount of 0.5-5%, based on the dry fiber.
  • the procedure in the second bleaching stage was then as usual.
  • Example 20 cotton bleach
  • a cotton pulp was processed and thickened and compressed in the usual way.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP96116677A 1995-10-30 1996-10-17 Procédé pour la préparation de papier et de pâte à papier Withdrawn EP0771902A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE1995140359 DE19540359A1 (de) 1995-10-30 1995-10-30 Verfahren zur Herstellung von Papier und Zellstoff
DE19540359 1995-10-30
DE1995143480 DE19543480A1 (de) 1995-11-22 1995-11-22 Verfahren zur Herstellung von Papier und Zellstoff
DE19543480 1995-11-30

Publications (1)

Publication Number Publication Date
EP0771902A1 true EP0771902A1 (fr) 1997-05-07

Family

ID=26019915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96116677A Withdrawn EP0771902A1 (fr) 1995-10-30 1996-10-17 Procédé pour la préparation de papier et de pâte à papier

Country Status (2)

Country Link
EP (1) EP0771902A1 (fr)
CA (1) CA2188909A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8980050B2 (en) 2012-08-20 2015-03-17 Celanese International Corporation Methods for removing hemicellulose
US8986501B2 (en) 2012-08-20 2015-03-24 Celanese International Corporation Methods for removing hemicellulose
CN115787334A (zh) * 2022-12-20 2023-03-14 东莞顺裕纸业有限公司 一种高强瓦楞芯纸的粗浆预处理方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0571089A (ja) * 1991-08-14 1993-03-23 Mitsubishi Gas Chem Co Inc 機械パルプの漂白方法
GB2278616A (en) * 1993-05-21 1994-12-07 Bayer Ag Lithium-containing assistants for dyeing and printing of cellulosic and/or regenerated cellulosic materials
EP0685589A2 (fr) * 1994-05-30 1995-12-06 Bayer Ag Procédé de prétraitement de fibres naturelles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0571089A (ja) * 1991-08-14 1993-03-23 Mitsubishi Gas Chem Co Inc 機械パルプの漂白方法
GB2278616A (en) * 1993-05-21 1994-12-07 Bayer Ag Lithium-containing assistants for dyeing and printing of cellulosic and/or regenerated cellulosic materials
EP0685589A2 (fr) * 1994-05-30 1995-12-06 Bayer Ag Procédé de prétraitement de fibres naturelles

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9316, Derwent World Patents Index; Class A97, AN 93-131635, XP002025412 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8980050B2 (en) 2012-08-20 2015-03-17 Celanese International Corporation Methods for removing hemicellulose
US8986501B2 (en) 2012-08-20 2015-03-24 Celanese International Corporation Methods for removing hemicellulose
CN115787334A (zh) * 2022-12-20 2023-03-14 东莞顺裕纸业有限公司 一种高强瓦楞芯纸的粗浆预处理方法
CN115787334B (zh) * 2022-12-20 2023-12-29 东莞顺裕纸业有限公司 一种高强瓦楞芯纸的粗浆预处理方法

Also Published As

Publication number Publication date
CA2188909A1 (fr) 1997-05-01

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