US1904894A - Process and apparatus for the manufacture of cellulose - Google Patents

Process and apparatus for the manufacture of cellulose Download PDF

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Publication number
US1904894A
US1904894A US527672A US52767231A US1904894A US 1904894 A US1904894 A US 1904894A US 527672 A US527672 A US 527672A US 52767231 A US52767231 A US 52767231A US 1904894 A US1904894 A US 1904894A
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Prior art keywords
digestion
container
charge
impregnation
cellulose
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Expired - Lifetime
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US527672A
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English (en)
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Westad Daniel
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Individual
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Individual
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    • 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
    • D21C1/00—Pretreatment of the finely-divided materials before digesting
    • D21C1/10—Physical methods for facilitating impregnation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/02—Chip soaking

Definitions

  • This invention relates to the manufacture of cellulose by heating wood chips or other cellulosic materials under pressure with aqueous solutions of chemicals capable of dissolving the incrustations of the raw material, thus liberatim the cellulose fibres,- and the invention has For its object a method of carrying this process into effect, which allows of obtaining an increased yield of cellulose of 10 first class quality as compared with the processes hitherto employed.
  • the digestion operation and the preparatory treatment with digestion liquor at low temperaturesunder high pressure may be carried out in the same vessel, viz. an ordinary digestor, but it is preferred to carry the operations into effect as separate steps in two or more separate sets ofcontainers, so arran ed in relation to one another that the material (wood chips and the like) can be readily transferred from one set of containers to another.
  • the process accordoperation allows of a coning to the invention is composed of two main phases: the impregnation base and the digestion or cooking phase.
  • the cellulosic material wood chips andthe like
  • the digestion liquor under'a high pressure, but at a relatively low temperature (viz. below 100911., usually between and 15; C. and even down to near zero).
  • the use of sulphite solutions or other solutions prepared by the use of gaseous reaction components may go a treatment of the chips 5 with the gaseous reagent or reagents.
  • This treatment with gaseous reagents may also suitably be efl'ected at low temperatures and in the same container as that in which the subsequent impregnation with liquid under 70 pressure takes place.
  • the gas may be applied under ordinary or increased pressure and even under pressures sufliciently high to bring about partial or complete condensation of the gas.
  • the impregnation step and the di estion step are carried out in diflerent vesse s, and v these vessels are suitably arranged above one another.
  • the impregnation vessel may be arranged on the floor above the digestors, so that the mixture of impregnated chi s and impregnation liquid can be transferre to the digestor under the actionof its ownweight.
  • the transfer of the charge is facilitated by 9 giving to the containers a form, adapted for the purpose.
  • the form of the vessel is suitably so elected as to romote as far as possible the utilization of t e gravity of the charge to convert same into a cyclonic centripetal moin relation to this container walls.
  • a suitable container may for example considered as composed of a conical main ort1on and a non-symmetrically cup-shaped ttom rtion,havingadeepened art, in which the ischarge o ning is placecfeccenlgricall x r1- ence has roved that a vessel so constrliifted can re I be em tied of a charge consisting of wood 0 ips and liquid.
  • I a In order to promote the discharge of the material, it may also be of advantage to provide the bottom portion of the container around the discharge opening with recesses, ribs or vanes, so arranged as to form an an le with radial lines throu h the center of t e discharge opening.v Ot erwise any type of container may be used forthe. reparatory treatment of the chips, provided tihat the allow of rapid and complete emptyingo the contents.
  • the vanes or ribs referred to above may with advantage be used in containers of any type and in combination with excentrically as well as with centrallyarrangod discharge openings. It is no necessary condition I -sectiononline-IV-IV of Fig. 2, an
  • vanes are arranged immediately adjacent to the outlet or at the bottom of the container.
  • the desired effect will be pro-- quizd also when the vanes are arranged on or nearto the side walls of the container.
  • a plane for carrying the invention intoef feet may'for example consist of two spherical digestors of 2i) m capacity each one preheating container of 32 in capacit above said digestors and two interim ta (impre nation containers) with a capacity of eac 46 m, arranged above the said preheating containers.
  • FIG. 1 is a diagrammatic representation of the P w a Fig. 2 1s a vertical sectional view, on an enlarged scale, of one of the impregnation Fig. 8 is a horizontal sectional view of the same tank on lines III-III of F 2 Fig. 4 is a side view of the ta partly in I his a horizontal sectional view of an im regnati 'on guide members on tbe bottom.
  • 1 and 2 represent the impre ation tanks, 3 the preheating (or precooking container and 4 and 5 the digestors.
  • the interim tanks (impregnation tanks) 1 and 2 are charged with chips, containing for example 32 per cent of moisture. This moisture percentage may be the result of a preceding soaking of the chips, in water orsome aqueous solution of chemicals, or it may be the original moisture of the wood, from which the chips have been cut.
  • e tank is thereupon laced under a pres- Sulphur dioxide gas is now introduced into sure of about 6 atmosp eres by liquid (or gas) ressure, while the temperature is maintaine below 70 C., for example at about 20
  • the presure is relieved and the mixture of chips and li uid is run into the preheating vessel'3.
  • E cient mixing of chips and liquor is promoted by the cyclonic motion oft e charge during the transfer to the preheating vessel, and may be further promoted by pumping liqluor from the bottom of the preheatingvesse into the interim tank at a int above the charge.
  • the temperature in the charge thus introduced into the preheatin vessel is now for exam le about 20 0. he charge is then hea to boiling temperature. After about 3 hours, the char is introduced into one of the di tors. e transfer and the mixing of chi and liquor is romoted by clrculatlon of 'quor as descri d in connection with the transfer from interim tank to pre- I heating vessel.
  • the digestion operation is carried out in process is terminated and the digestors em tied.
  • any other type of digestion liquid than calcium of course be employed, such as for examp e sulphite solution, in which the base is magnesia, potash, soda or am- ,monia or mixtures of two or more of these bases, with or without auxiliary additlons,
  • the employed bases or auxiliary additions may also be added in part to the digestion liquor, before it is brought into the impregnation vessel; but they may also be used at least in part to prepare the chips or other celluloslc raw materialfpreviously to the introduction of the sulphurous acid gas into the charge.
  • the'process as described maybe carried outalso without the use of special preheatin vessels 3.
  • the charge is direct y trarsferred from the, impregnation tanks 1, 2 to the digestors 4, 5.
  • the number of digestors will then havev to be increased with one for each two impregnation tanks.
  • the volumes of the di estors will then have to be dimensioned as or the preheating vessel in the described example.
  • the invention is not limited to the use of two or three sets of containers, but covers the execution of the process in any number of stages carried into efiect in succession in separate containers,
  • a process of recovering cellulose from raw materials comprising subjecting a charge of the raw material to impregnation with a digestion-liquid under a pressure raised several atmospheres above normal and at a temperature considerably below 100 C. in a closed impregnation vessel for a period of several hours, thereupon transferring the entire charge including the contained digestion liquid into another vessel, and then heating the charge consistingof im regnated raw material and digestion liqui to digestion temperatures considerably-above 100 C. for a period of time sufficient to effect complete dissolution of the incrustations on the material.
  • a process for the recovering of cellulose from raw materials comprising subjecting a batch of the raw material to impregnation with digestion 1i uid in an impregnation chamber for a de nite period of time, subjectingi another batch of the material to the ind of impregnation in another impregnation chamber for the same period of time as that of the first named batch, trans-' ferring the first named batch in its entirety, from the impregnation chamber into a secondary treating chamber and retaining same in this chamber for a definite period of time, removing the treated charge from said secondary treating chamber, and immediately afterwards transferring the second impregnated batch in its entirety directly from the second impregnationv chamber into the secondary treating chamber and retaining same therein for the same period of time as the removed batch.
  • a container for'impregnating cellulosei downwardly m 6.
  • a container according to claim 5 in which there is provided interior guide members so arranged in relation to the flow of the charge during discharge through the opening in the bottom that they effect a whirling motion of the charge around a vertical ans.
  • a multiple-stage process for recovering cellulose from raw materials in which a charge of the material is impregnated with reactive liquid in one container and is subjected to a final digestion treatment in another container, the duration of the impregnation treatment in relation to the duration of the digestion treatment being shortened or lengthened by decreasing or increasing respectively the number of impregnation containers in cooperative operation with the digestion containers.
  • Process of recovering cellulose from raw materials comprising subjecting a charge of the raw material to the action of gaseous sulphurous acid so as to effect absorption of gaseous sulphurous acid in the moisture in the interior of the lndividualpiecesof raw material, thereupon subjecting the so. re-

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  • Paper (AREA)
  • Extraction Or Liquid Replacement (AREA)
US527672A 1930-05-27 1931-04-04 Process and apparatus for the manufacture of cellulose Expired - Lifetime US1904894A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO375821X 1930-05-27

Publications (1)

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US1904894A true US1904894A (en) 1933-04-18

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US527672A Expired - Lifetime US1904894A (en) 1930-05-27 1931-04-04 Process and apparatus for the manufacture of cellulose

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US (1) US1904894A (en(2012))
BE (1) BE379441A (en(2012))
DE (1) DE593890C (en(2012))
FR (1) FR720219A (en(2012))
GB (2) GB375821A (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076739A (en) * 1958-08-11 1963-02-05 Nettel Frederick Manufacture of pulp from fibrous substances
US3393122A (en) * 1964-06-03 1968-07-16 Georgia Pacific Corp Pretreatment of green wood with reducing agent prior to storage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1044477B (de) * 1954-03-01 1958-11-20 Amsler Morton Corp Anordnung zur Regelung, Anzeige oder Registrierung einer Betriebsgroesse
US2885317A (en) * 1954-03-30 1959-05-05 Stora Kopparbergs Bergslags Ab Method in manufacturing chemical or semi-chemical pulp from heavily resinous wood

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3076739A (en) * 1958-08-11 1963-02-05 Nettel Frederick Manufacture of pulp from fibrous substances
US3393122A (en) * 1964-06-03 1968-07-16 Georgia Pacific Corp Pretreatment of green wood with reducing agent prior to storage

Also Published As

Publication number Publication date
GB375873A (en) 1932-06-30
GB375821A (en) 1932-06-30
FR720219A (fr) 1932-02-17
BE379441A (en(2012))
DE593890C (de) 1934-03-09

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