GB734216A - Process for the treatment of ligno-cellulosic fibres - Google Patents

Process for the treatment of ligno-cellulosic fibres

Info

Publication number
GB734216A
GB734216A GB2946/53A GB294653A GB734216A GB 734216 A GB734216 A GB 734216A GB 2946/53 A GB2946/53 A GB 2946/53A GB 294653 A GB294653 A GB 294653A GB 734216 A GB734216 A GB 734216A
Authority
GB
United Kingdom
Prior art keywords
treatment
sulphur dioxide
materials
mass
acid
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
GB2946/53A
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.)
PROCEL SA
Original Assignee
PROCEL SA
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 PROCEL SA filed Critical PROCEL SA
Publication of GB734216A publication Critical patent/GB734216A/en
Expired legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00Pulping cellulose-containing materials
    • D21C3/04Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
    • D21C3/06Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01FCHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F2/00Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof
    • D01F2/06Monocomponent artificial filaments or the like of cellulose or cellulose derivatives; Manufacture thereof from viscose
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C1/00Pretreatment of the finely-divided materials before digesting
    • D21C1/04Pretreatment of the finely-divided materials before digesting with acid reacting compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Abstract

Fibrous ligno-cellulosic materials such as wood chips, bagasse or straw are treated, prior to alkali digestion, with steam at atmospheric pressure and at a temperature of substantially 100 DEG C., the steam containing sulphur dioxide and the treatment being carried out under such conditions that the quantity of dilute sulphurous acid condensed on the materials is so small, in relation to the amount of the materials, that substantially no flow of such dilute sulphurous acid occurs over the surfaces of the particles of the materials. The apparatus may consist of an autoclave for discontinuous treatment or of a tall column for continuous treatment. The proportion of sulphur dioxide may be 1-3 per cent, calculated on the dry material treated. In an example 100 kg. of eucalyptus wood chips (dry weight) containing 15 per cent of water are charged into a pressure cooker provided with a heat-insulating jacket, the air therein is partially exhausted and 2.5 kg. of gaseous sulphur dioxide is injected together with sufficient steam to increase the temperature to 100 DEG C. The mass is maintained at 100 DEG C. for 2-3 hours, during which time the water content of the chips increases to 40-50 per cent but no flow of condensate occurs over the chips. The pressure cooker is exhausted to remove the residual free sulphur dioxide, and the lignosulphonic acid formed during the treatment is neutralized and dissolved by the addition of black liquor from a previous cycle of operations. The mass is heated to 100 DEG C., drained and covered with an aqueous solution of caustic soda (110 g. per litre). Part of the caustic soda may be replaced by sodium sulphide. The mass is heated to 160-170 DEG C. for 1.2 hours, drained and washed. The black liquor thereby obtained is used for the neutralization of the next batch of hydrolized cellulosic material. The treated pulp may be bleached, e.g. by two or three treatments with chlorine in an acid medium followed by hypochlorite in an alkaline medium. Examples are given of the similar treatment of bagasse and chopped straw. The sulphur dioxide may be generated in situ in the cooker, e.g. by charging the cooker with aqueous solutions of sodium bisulphite and sulphuric acid.
GB2946/53A 1952-02-15 1953-02-02 Process for the treatment of ligno-cellulosic fibres Expired GB734216A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1005824X 1952-02-15

Publications (1)

Publication Number Publication Date
GB734216A true GB734216A (en) 1955-07-27

Family

ID=9565170

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2946/53A Expired GB734216A (en) 1952-02-15 1953-02-02 Process for the treatment of ligno-cellulosic fibres

Country Status (4)

Country Link
DE (1) DE1005824B (en)
FR (1) FR1052900A (en)
GB (1) GB734216A (en)
NL (1) NL87584C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998049390A1 (en) * 1997-04-28 1998-11-05 Almeida Oliveira Baptista Joao A wood delignification chemical process using ammonium magnesium bisulphite as the active reagent
WO2013164598A1 (en) * 2012-05-02 2013-11-07 Innovia Films Limited Process
EP3901367A1 (en) * 2020-04-20 2021-10-27 Scitech-service OY Method for prehydrolysis of lignocellulosic material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA766073B (en) * 1975-10-24 1977-09-28 D Econimidis Production of pulp

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE124556C (en) *
DE237081C (en) * 1909-12-13
DE395119C (en) * 1923-10-11 1924-05-14 Carl G Schwalbe Dr Process for the pretreatment of vegetable raw materials to facilitate the subsequent acidic or alkaline digestion
DE484805C (en) * 1924-11-02 1929-11-11 Leopold Enge Process for softening wood or similar vegetable fibers
DE744868C (en) * 1940-03-22 1944-01-27 Dr Georg Jayme Process for the production of low-pentosan cellulose from plant matter
BE447209A (en) * 1941-12-22

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998049390A1 (en) * 1997-04-28 1998-11-05 Almeida Oliveira Baptista Joao A wood delignification chemical process using ammonium magnesium bisulphite as the active reagent
WO2013164598A1 (en) * 2012-05-02 2013-11-07 Innovia Films Limited Process
CN104321347A (en) * 2012-05-02 2015-01-28 伊诺维亚薄膜有限公司 Process
JP2015517582A (en) * 2012-05-02 2015-06-22 イノヴィア フィルムズ リミテッド Method
US9493581B2 (en) 2012-05-02 2016-11-15 Innovia Films Limited Process for the manufacture of viscose
EP3901367A1 (en) * 2020-04-20 2021-10-27 Scitech-service OY Method for prehydrolysis of lignocellulosic material
WO2021214387A1 (en) * 2020-04-20 2021-10-28 Scitech-Service Oy Method for prehydrolysis of lignocellulosic material

Also Published As

Publication number Publication date
NL87584C (en)
FR1052900A (en) 1954-01-28
DE1005824B (en) 1957-04-04

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