GB358980A - Process for working up crude cellulose ester solutions - Google Patents

Process for working up crude cellulose ester solutions

Info

Publication number
GB358980A
GB358980A GB2152930A GB2152930A GB358980A GB 358980 A GB358980 A GB 358980A GB 2152930 A GB2152930 A GB 2152930A GB 2152930 A GB2152930 A GB 2152930A GB 358980 A GB358980 A GB 358980A
Authority
GB
United Kingdom
Prior art keywords
water
cellulose
forced
crude
reaction mixture
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
GB2152930A
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to GB2152930A priority Critical patent/GB358980A/en
Publication of GB358980A publication Critical patent/GB358980A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B3/00—Preparation of cellulose esters of organic acids
    • C08B3/22—Post-esterification treatments, including purification
    • C08B3/26—Isolation of the cellulose ester
    • C08B3/28—Isolation of the cellulose ester by precipitation

Abstract

Crude solutions of fatty acid esters of cellulose obtained by the acylation of cellulose in the presence of solvents insoluble in water, for example chlorinated hydrocarbons, are worked up by firstly partially deacidifying the crude solution as by extraction with small amounts of water, and then forcing into water while maintaining a large surface of contact, the temperature of the water lying above the boiling point of the azeotropic mixture of solvent, water, and acid. The crude solution may itself be heated during precipitation, which may take place under reduced pressure. In examples, (1) a reaction mixture of cellulose acetate prepared in the presence of ethylene chloride is extracted twice with water so that the residue contains only 30-50 per cent of the original acetic acid and is forced through a sieve into water at 85 DEG C. The cellulose ester is precipitated in a flaky, porous form. (2) A reaction mixture of cellulose acetobutyrate containing methylene chloride is extracted as above and forced into water at 50 DEG C. Specification 337,366, [Class 2 (ii), Cellulose &c.], is referred to.
GB2152930A 1930-07-16 1930-07-16 Process for working up crude cellulose ester solutions Expired GB358980A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2152930A GB358980A (en) 1930-07-16 1930-07-16 Process for working up crude cellulose ester solutions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2152930A GB358980A (en) 1930-07-16 1930-07-16 Process for working up crude cellulose ester solutions

Publications (1)

Publication Number Publication Date
GB358980A true GB358980A (en) 1931-10-16

Family

ID=10164440

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2152930A Expired GB358980A (en) 1930-07-16 1930-07-16 Process for working up crude cellulose ester solutions

Country Status (1)

Country Link
GB (1) GB358980A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775529A (en) * 1951-03-28 1956-12-25 British Celanese Manufacture and use of cellulose esters

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775529A (en) * 1951-03-28 1956-12-25 British Celanese Manufacture and use of cellulose esters

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