US1633730A - Apparatus and process for making paper pulp - Google Patents

Apparatus and process for making paper pulp Download PDF

Info

Publication number
US1633730A
US1633730A US42960A US4296025A US1633730A US 1633730 A US1633730 A US 1633730A US 42960 A US42960 A US 42960A US 4296025 A US4296025 A US 4296025A US 1633730 A US1633730 A US 1633730A
Authority
US
United States
Prior art keywords
liquor
tank
digester
extractives
pipe
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.)
Expired - Lifetime
Application number
US42960A
Other languages
English (en)
Inventor
Jr Frederick K Fish
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US1633730A publication Critical patent/US1633730A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/20—Pulping cellulose-containing materials with organic solvents or in solvent environment

Definitions

  • UNITED fsTA 1 ame mam; or shin rnAncrsco, CALHORNIA.
  • This invention relates -to improvements in an apparatus and process for. making paper pulp.-
  • One of the prime objects; ofthis invention is to provide a process, and-an apparatus for carrying out the process, which will insure of the retentionof-thesolvent extractives,i.resulting from the treatment free of contact with the air and thereby preserve most of the heat and the valuesin the liquors for-future. use. Then, in the next .operation'these, liquors are enriched by the addition of strengthening agents, which produce highly important. .results and a greatly improved pulp.
  • a further object of the invention s the provision of an apparatus, and vprocess, for materially lightening the color of the pulp, without employing intensive bleachlng after the pulp is finished, thereby reducing t-he cost and time incident to the manufacture of the product.
  • Another object of the invention isto provide a step inthe process of making pulp which acts to wash the pulp before it cools, and by' the liquor used in treating the material.
  • Another objectofthe invention is to provide a process, wherein, in the treatment of the material being acted upon, the digesting liquor is initially mixedwith an alkali and solvent extractives from material similar.
  • a still further ob ect 7 of this invention is to provide a rocess,.where in the digesting liquoris initia ly' charged with an alkali or like reagent and solvent extractives ofplant a liquor, stronger in solvent extractivesthan the initially charged liquor first used. fromthe specific description in the specification, and will be. particularly pointed out in the claims. w
  • alkali is a solvent but not a so vent extractive as used herein.
  • solvent 11o illustrates a digester to receive chips or other fibrous material, suitable for making pulp.
  • tank 1 Spaced from the tank 1, is a tank 2, in which the digesting liquor is stored and pre-lieated before being introduced to digester 1,
  • Apipe 3 connects the bottom of digester 1, withthe top of the tank 2, a valve'4, being provided to regulate the flow of fluid or volatile extractives and thelike, as the case may be, passing from tank to the digester.
  • a pipe-2 connects the top of the dlg'ester' 1 and the top of the A ipe5, communicates with the digester 1, at or aboutthe level of the liquor, when thec-li'ips are submerged, and communicates at its other end with thebottom of tank 2,
  • a valve 6 bein provided to control the flow through'the pipe to tank 2.
  • a 7 in the pipe controllingthe flow of'liquor between the digester and tank and vice versa.
  • a double acting pump 7 to assist the flowof liquor through the pipe 1n .either direction.
  • a closure 8 for the introduction of the chipsto be treated, and adjacent thereto is a relief valve 10.
  • a drain'pipe 11,- p'rovit led with a valve 12. and adjacent thereto is a steam pipe 13, having a* valve 14, for introducing steam to the liquor in the digester l,when carrying out theiprocess.
  • a pipe 1 communicates with the bottom of the 'digester and connects with the suction side of a pum 1?,faiid from the opposite or outlet side of the pump leads a pipe 1, which communicates at its opposite end with the top of thedigester.
  • This pump and pipe line is utilized to establish a circulation in the'digester 1, to facilitate the action of the liquor on and in the chips during the treating operation, as will hereinafter appear.
  • a steam pipe 17, having a valve'lS From the top of tank 2, extends a steam pipe 17, having a valve'lS, and adjacent thereto is a pressure release pipe 19, provided with a valve 20.
  • the bottom of the tank 2 is provided with a pipe 21, and a valve 22. to charge the tank with liquor, and in said bottom s a draw-oil pipe 23, provided with a val-ve24, andfa steam-pipe 25, having a valve 26.
  • valve 44 From the bottom of tank 40 extendsf'a pipe 45, which leads to the pump 7 and 'is' provided with a valve 46.
  • a pipe 41 communicates with-thetop of the'tank 40, and is provided with a valve 42. This pipe connects with the top of the digester 1, through a part of pipe 2*,and
  • pipe 2 is used topass solvent ex- 'tractives and other fluids from the top of tank 40 to the top of the di ester, and vice versa, This line is only use under circum-' stances requiring passage of extractives from the tanks, should occasion require.
  • the top of the tank 40 is pi-ovided with a relief pipe and valve'47, and a steam "pipe and valve 48. From the bottom ofthe'tank 40, leads a pipe 49, which extends to a centri fugal machine 49, and from this machine extends a pipe 50 which leads to an evaporator 51.
  • digesting liquor is introduced to tank 2, through pipe 21. This liquor is. initially charged with an alkali,
  • valve 7 is partially opened to admit suflicientliquor from tank 2, to allow of saturation of the chips, and simultaneously valve 4 is partially opened to admit volatile extractives and alkali from'the totp of tank 2 to the liquor in the bottom 0 the digester, in an amount suflicient to niaintain'the desired temperature. of the chips and the liquor, carebeing taken to regulate :the heat so as to avoid raising the temperature above 150 F.
  • Pump .1 is
  • the vacuum Withdraws the air from around the chips, and from the interiorof said chips, to render the interior more susceptible to the penetration of the digesting liquor, even the innermost cells of the individual pieces. -The vacuum is maintainedfor such length of time as may be found desirable, this depending upon the physical characteristics of the chips, and the nature and extent of treatment, the chips are to be subjected to. l
  • the pump 1 operates to continue the circulating action of the liquor.
  • This circulation Oi the liquor in spray 'form, while the vacuum is on, insuresrthe cellular structure of the chips being further saturated withthe alkali and solvent. extractives which producesin efiecta bleaching action.
  • the vacuum is'on valve 4 is also kept open for continued admission of the volatile extractives to the liquor in the bottom of the .digestenlL
  • valve 4 is opened wide to admit a full charge of the alkali and solvent ,extractives, to the digester l, to bring up the temperature of the chips toor about 212 F.
  • the digesting liquor in tank 2 is heated to the desired degree, and the corresponding pressure raised in the tank by introduction of steam into the bottom of the tank through pipe 25.
  • the liquor treating step in my process is important, as the previous tre'atmentofthe plant material by the mixture of the solvent extractives and alkali ,materia-lly assists the liquor step to accomplish the desired end, bearing in mind that, previous tothis time the plant material was subjected to the 'action of the alkali and extractives, and liquor under low temperature conditions, which distributed the alkali and extractives in and throughout the cellular structure of the chips and caused a bleaching action of the fibers.
  • the constituents to be removed have therefore, to a very large degree, been heated, softened,
  • the liquor serves" to melt and dissolve resins and removes same from within the chips; removes tannins and organic matter,
  • the light color of the fina product is one of therewithout afi'ectin sults flowing from my improved process and is of commercial importance as it saves the expense and delay incident to the usual intensive bleaching step.
  • ebullition of the digesting liquor in the digester '1 and the liberation of the released constituents from the chips, cause certain of these constitutents to rise to the top.
  • This layer or surface accumulation on theliquor contains resinous substances, terpenes and other by-products liberated from the chips, which would be detrimental to the, pulp if permitted to come into contact with the atmosphere and thereafter remain in or on the liquor or material, and yet these byproducts are valuable as extractives for future use, if preserved free of contact with the atmosphere.
  • valve 6, in pipe 5 is opened, and pressure in the digester lblows the surface constituents accumulated on top of the liquor, and the volatile extractives above the liquor, over into tank 2, where same are preserved for use on a subsequent charge of chips in the digester. This suddenly reduces the pressure in tank 1, which causes an .outward movement of the liquor containing the constituents from the chips, pressure at this time being below the pressure in tank 1.
  • Valve 6 is closed, and the volatile and other constituents saved from the charge in the digester 1, are preserved in tank 2 without air in anywise coming into contact with said liquor, thus preventing oxidation or other deterioration of these important constituents.
  • valve 7' is opened, and pump 7" is started, which with the contained pressure, forces the digesting liquor from the digester 1, through pipe 7 and into the bottom of tank 2, then valve 7 is closed.
  • H 1
  • the liberated extractives and the resinous properties taken from the wood now contained in the liquor are car ried over without in anywise coming into contact with the atmosphere, and the orig inal digesting liquor is thereby enriched, and is preserved for a subsequent treatment, the lighter properties of course rising to the top of the liquor in tank 2, and are em-- .reaanso uents from the innermost cells of the chips and transfer same to tank 34., from whence they are transferred into tank 2 by the pump 36, and are preserved to further enrich the already enriched liquor in tank 2, to be used in a subsequent treatment.
  • This second .vacuum treatment recovers extractives which only become volatile under pressure below atmospheric, such extractives being preserved and intermixed in the liquor for enriching same for future use.
  • Tank 40 is charged with cooking liquor, which may be soda, sulphate or the like, and the temperature and corresponding pressure isprovided to super-heat the liquor, the desired temperature and pressure being raised according to the character of liquor being used. While the vacuum is held in the digester 1, valves '2' and 46 are opened and steam is admitted to the top of the tank through pipe 48, which transfers the cooking liquor from tank 40 .to, the bottom of digester 1, and there valves 38 and 28 are closed, and the vacuum pump is stopped, and steam is then vadmitted to the digester through vpipc 13. The temperature of the cooking iquor in the digester is raised to about 337 F. and a corresponding pressure of about lbs. and the material is cooked from about four to seven hours, depending .upon theresult sought tobe accomplished.
  • cooking liquor which may be soda, sulphate or the like
  • Valves 7 a and 46 are of course closed as soon as the liquor has been transferred.
  • valve 44 may be opened and by reason of the pressure I and the pressure in the digester and the action of the pump transfers the liquor to tank 40, entirely free of contact with the atmosphere, hence saving the values in the liquor and the added solvent extractives from the material for future use.
  • valve 7 is opened and pump 7 is started and super-heated digesting' liquor from tank 2 is transferred to the digester 1, and the pulp material is treated for approximately 30 minutes, the temperature of the liquor during this treatment being maintained at about 285 F. With a corresponding pressure, After this treatment the liquor is again transferred to tank 1 2, without in anywise coming in contact with the atmosphere. The pulp is now removed from the digester.
  • This treatment of the pulp material at this stage of the process acts to preliminarily wash the material, which assists in expediting the final washing of the pulp.
  • One of the salient features of the invention is the recovery of the cooking liquor without contact with the air to preserve the base liquor' and its now intermingled and intermixed solvent extractives for cooking the next run of chips in the digester. All this cooking liquor is not preserved asits base has been weakened by the action incurred in the digester. Hence a part of the recovered liquor is drawn off to the centrifugal machine, and treated to separate the lighter from the heavier portions, the lighter portion of the liquor being preserved to recover any remaining values. The matter separated in the centrifugal machine is removed to incinerators and treated to further recover chemicals for reuse.
  • the used recovered liquor in tank 40 is weakened but the materials recovered from the previous use are preserved and are utilized by adding strengthening agents to bring-it up to the desired strength for action on a charge in another reuse.
  • the digesting liquor is greatly enriched for the next charge to be treated.
  • a pipe 60 is connected to the pipe 2*, and the evaporator 51 and in the pipe is avalve 61.
  • step 11 which consists in enriching the liquor used in the first stage by the addition of gases or vapours evolved from the second stage liquor in the storage tank.
  • An apparatus for producing pulp consisting of a digester in combination with a tank for preliminary treating liquor, a
  • a pump for removing air from material in said digester means for circulating liquor to or fromisaid digester from or to each of said tanks, withoutcontact with the atmosphere. and separate. means for transferring vapours containing volatile solvent extractivesfrom or to the top of said digester from or to each of said tanks.
  • An apparatus as defined in claim 13 having additional means for circulating volatile extractives from the top of either or both of said tanks to the bottom of the and incorporating the recovered vapors and volatile extractives in the liquorin which the pulp is treated.

Landscapes

  • Paper (AREA)
US42960A 1924-12-22 1925-07-11 Apparatus and process for making paper pulp Expired - Lifetime US1633730A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA244789X 1924-12-22

Publications (1)

Publication Number Publication Date
US1633730A true US1633730A (en) 1927-06-28

Family

ID=4171269

Family Applications (1)

Application Number Title Priority Date Filing Date
US42960A Expired - Lifetime US1633730A (en) 1924-12-22 1925-07-11 Apparatus and process for making paper pulp

Country Status (3)

Country Link
US (1) US1633730A (fr)
FR (1) FR609627A (fr)
GB (1) GB244789A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061612B (de) * 1954-02-08 1959-07-16 Josef Leitner Verfahren zur Herstellung von bleichfaehigem Halbzellstoff durch Behandeln von Nadel- oder Laubholz mit reduzierenden Loesungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061612B (de) * 1954-02-08 1959-07-16 Josef Leitner Verfahren zur Herstellung von bleichfaehigem Halbzellstoff durch Behandeln von Nadel- oder Laubholz mit reduzierenden Loesungen

Also Published As

Publication number Publication date
FR609627A (fr) 1926-08-18
GB244789A (en) 1926-08-19

Similar Documents

Publication Publication Date Title
US2541058A (en) Processing of lignocellulose materials
CN106012627B (zh) 一种利用醇类溶剂制备竹材高白度漂白化机浆的方法
US2675311A (en) Paper pulp process and apparatus
US1633730A (en) Apparatus and process for making paper pulp
US3988198A (en) Method for treating hemi caustic effluents
US1480804A (en) Process of treating lumber
US2284500A (en) Hydrolysis of cellulosic materials
US2372561A (en) Process of treating low rank textile fibers
US3576709A (en) Process for making pulp utilizing a mixture of phosphoric and nitric acids
JPH07501860A (ja) パルプの製造方法
US1842712A (en) Manufacture of wood pulp, etc.
US1830421A (en) Manufacture of pulp and paper from resinous woods
US3278367A (en) Method of producing wood pulp including steaming, vacuum, and impregnation
US2041666A (en) Cyclic process of treating alkaline pulps
CA1087354A (fr) Procede de cuisson aux alcalis et delignification des matieres cellulosiques
US1633731A (en) Process for treating plant material
US2459570A (en) Method of refining sulfate turpentine
US2175154A (en) Method for treating cellulosic material
US1880044A (en) Process of alkaline fiber liberation
USRE20217E (en) Production of pulp
US1825655A (en) Method of manufacturing cellulose
US1862177A (en) Method of manufacturing cellulose
US1830461A (en) Production of pulp, etc.
US1721376A (en) Method of manufacturing cellulose pulp
US1649281A (en) Method of loosening vegetable fibers