GB557324A - Improvements in the production of cellulose from ligno-cellulosic material - Google Patents

Improvements in the production of cellulose from ligno-cellulosic material

Info

Publication number
GB557324A
GB557324A GB632842A GB632842A GB557324A GB 557324 A GB557324 A GB 557324A GB 632842 A GB632842 A GB 632842A GB 632842 A GB632842 A GB 632842A GB 557324 A GB557324 A GB 557324A
Authority
GB
United Kingdom
Prior art keywords
cellulose
solution
dilute
acid
treatment
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
GB632842A
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.)
Henry Dreyfuss Associates LLC
Original Assignee
Henry Dreyfuss Associates LLC
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 Henry Dreyfuss Associates LLC filed Critical Henry Dreyfuss Associates LLC
Priority to GB632842A priority Critical patent/GB557324A/en
Publication of GB557324A publication Critical patent/GB557324A/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
    • 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
    • D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching

Abstract

557,324. Refining cellulosic materials. DREYFUS, H. May 11, 1942, No. 6328. [Class 2 (ii)] In the preparation of cellulose from wood or other ligno-cellulosic material, the material is first subjected to a treatment to remove the lignin and is then heated with a dilute aqueous solution of an acid, other than nitric or nitrous acid, then treated with an alkaline solution to dissolve hemicelluloses, and then the alkaline solution containing the hemicelluloses is removed from the materials. The acid used may by hydrochloric, sulphuric, oxalic, tartaric, or citric acid of a concentration of 0.05 to about 1.0 per cent. strength. The treatment may be carried out at 80-100‹C. for one half to three hours. Wood of poplar, beech, oak, or birch, or straw may be partially or wholly de-lignified by the sulphate, soda, bisulphite, chlorine, peroxide, or hypochlorite processes. The material may then be treated with a dilute solution of caustic soda for removal of residual lignin. The material may then be heated with the dilute acid. After the acid treatment, hemicelluloses may be removed by treatment with caustic soda solution of 6-15 per cent. strength at ordinary temperature. The material may then be treated with a 0.5-1 per cent. solution of caustic soda at 100‹-120‹C. and it may then be bleached. If desired, treatment with the dilute alkali may be carried out before treatment with the more concentrated alkali. In an example, straw is heated under pressure' with dilute caustic soda solution. The crude cellulose is mixed with calcium hypochlorite and water acidulated with hydrochloric acid. After several hours the bleached cellulose is boiled with dilute sodium carbonate solution, and then boiled for 2 hours with dilute hydrochloric acid solution. The cellulose is then treated with a solution of caustic soda of 12 per cent. strength at room temperature for one hour. It is boiled with dilute caustic soda, and then bleached with calcium hypochlorite. The cellulose produced by the process may be used for making high grade paper or for producing cellulose xanthate, cuprammonium cellulose solutions, cellulose acetate, or other cellulose derivatives. Specifications 438,435, 474,305, 477,842, 554,721 and 555,985 are referred to.
GB632842A 1942-05-11 1942-05-11 Improvements in the production of cellulose from ligno-cellulosic material Expired GB557324A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB632842A GB557324A (en) 1942-05-11 1942-05-11 Improvements in the production of cellulose from ligno-cellulosic material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB632842A GB557324A (en) 1942-05-11 1942-05-11 Improvements in the production of cellulose from ligno-cellulosic material

Publications (1)

Publication Number Publication Date
GB557324A true GB557324A (en) 1943-11-16

Family

ID=9812489

Family Applications (1)

Application Number Title Priority Date Filing Date
GB632842A Expired GB557324A (en) 1942-05-11 1942-05-11 Improvements in the production of cellulose from ligno-cellulosic material

Country Status (1)

Country Link
GB (1) GB557324A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262553A2 (en) * 1986-10-03 1988-04-06 Akzo Nobel N.V. Process for treating cellulosic raw materials
WO2008155639A3 (en) * 2007-06-20 2009-02-19 Nagarjuna Energy Private Ltd A process for separating biomass components

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262553A2 (en) * 1986-10-03 1988-04-06 Akzo Nobel N.V. Process for treating cellulosic raw materials
EP0262553A3 (en) * 1986-10-03 1989-04-26 Akzo N.V. Process for treating cellulosic raw materials
WO2008155639A3 (en) * 2007-06-20 2009-02-19 Nagarjuna Energy Private Ltd A process for separating biomass components
AU2008264871B2 (en) * 2007-06-20 2012-05-31 Nagarjuna Energy Private Limited A process for separating biomass components

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