GB549551A - Ligno-cellulose fibrous pulps and process of making same - Google Patents

Ligno-cellulose fibrous pulps and process of making same

Info

Publication number
GB549551A
GB549551A GB3663/41A GB366341A GB549551A GB 549551 A GB549551 A GB 549551A GB 3663/41 A GB3663/41 A GB 3663/41A GB 366341 A GB366341 A GB 366341A GB 549551 A GB549551 A GB 549551A
Authority
GB
United Kingdom
Prior art keywords
treatment
acid
steam
solution
feeder
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
Application number
GB3663/41A
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.)
Valmet AB
Original Assignee
Defibrator AB
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 Defibrator AB filed Critical Defibrator AB
Publication of GB549551A publication Critical patent/GB549551A/en
Expired legal-status Critical Current

Links

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
    • D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Paper (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

549,551. Preparation of cellulosic pulp. AKTIEBOLAGET DEFRIBRATOR. March 17, 1941, No. 3663. Convention date, March 21, 1940. [Class 2 (ii)] Lignocellulosic raw material is subjected to mechanical defibration in a closed receptacle at a temperature above 100‹C. and under a steam pressure above atmospheric pressure, acid conditions corresponding to a pH-value of 1-4 being maintained within the raw material by the addition of a solution of an acid, a salt, or other compound capable of creating acid conditions at the elevated temperature of the treatment. The treatment is carried out for a period of not more than 10 minutes, after which the fibre stock is immediately discharged from the receptacle. The process is applicable to the treatment of straw from wheat, rye, corn, rice, grasses, flax, and other plants, or of wood, bagasse or bamboo. The acidic substance may be sulphuric, sulphurous, hydrochloric, nitric, or acetic acid, or sodium bisulphate, sodium bisulphite, or aluminium sulphate. The conditions of treatment are preferably such that a slight hydrolysis of the hemi-celluloses including pentosanes occurs but the lignin and cellulose are substantially unaffected. The process may be carried out as a continuous operation in apparatus having a continuous feeder, pre-heater, disc refiner, and discharger. The feeder may consist of a plunger or feed-screw, continuously pressing the chips or chaff into a steam-tight plug through a relatively narrow plug-forming pipe into the pre-heater of the defibrator which is working in an atmosphere of steam under pressure. The quantity of solution added is not greater than what can be absorbed by the material. The plunger or screw feeder presses out any excess of acid solution. The defibrated pulp is discharged to the outside atmosphere. It may then be washed, beaten, screened, and formed into paper or board. The acidic solution may be applied to the fibrous material by immersion or spraying. If desired, it may be sprayed into the defibrator. A mineral acid may be used in an amount of 0.2-3 per cent. based on the weight of dry straw. The moisture present, including condensed steam, should be about one-quarter to ten litres per kilogram of material when the latter is subjected to the mechanical treatment.
GB3663/41A 1940-03-21 1941-03-17 Ligno-cellulose fibrous pulps and process of making same Expired GB549551A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE549551X 1940-03-21

Publications (1)

Publication Number Publication Date
GB549551A true GB549551A (en) 1942-11-30

Family

ID=20311760

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3663/41A Expired GB549551A (en) 1940-03-21 1941-03-17 Ligno-cellulose fibrous pulps and process of making same

Country Status (2)

Country Link
GB (1) GB549551A (en)
NL (1) NL61014C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2992154A (en) * 1956-04-16 1961-07-11 Cigarette Components Ltd Process for producing an article of curly interlocking cellulosic fibres and fibrils
EP2336344A1 (en) * 2009-12-21 2011-06-22 Sekab E-Technology AB Pre-treatment of cellulosic material
CN112726245A (en) * 2021-02-02 2021-04-30 李亚龙 Wood fiber production process

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2992154A (en) * 1956-04-16 1961-07-11 Cigarette Components Ltd Process for producing an article of curly interlocking cellulosic fibres and fibrils
EP2336344A1 (en) * 2009-12-21 2011-06-22 Sekab E-Technology AB Pre-treatment of cellulosic material
WO2011080131A3 (en) * 2009-12-21 2011-09-29 Sekab E-Technology Ab Pre-treatment of cellulosic material
US8834633B2 (en) 2009-12-21 2014-09-16 Sekab E-Technology Ab Pre-treatment of cellulosic material
AP3319A (en) * 2009-12-21 2015-06-30 Sekab E Technology Ab Pre-treatment of cellulosic material
US9528129B2 (en) 2009-12-21 2016-12-27 Sekab E-Technology Ab Pre-treatment of cellulosic material
CN112726245A (en) * 2021-02-02 2021-04-30 李亚龙 Wood fiber production process
CN112726245B (en) * 2021-02-02 2024-01-26 李亚龙 Wood fiber production process

Also Published As

Publication number Publication date
NL61014C (en)

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