GB482885A - Improvements in or relating to the production of cellulose ethers - Google Patents

Improvements in or relating to the production of cellulose ethers

Info

Publication number
GB482885A
GB482885A GB21508/36A GB2150836A GB482885A GB 482885 A GB482885 A GB 482885A GB 21508/36 A GB21508/36 A GB 21508/36A GB 2150836 A GB2150836 A GB 2150836A GB 482885 A GB482885 A GB 482885A
Authority
GB
United Kingdom
Prior art keywords
cellulose
sheet
alkali
agent
etherifying agent
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
GB21508/36A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB482885A publication Critical patent/GB482885A/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
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
    • C08B11/10—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals
    • C08B11/12—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals substituted with acid radicals substituted with carboxylic radicals, e.g. carboxymethylcellulose [CMC]
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers

Abstract

Cellulose ethers of a low degree of etherification which are insoluble in water but soluble in aqueous alkali, are prepared by a process involving the steps of continuously impregnating with a liquid etherifying agent a cellulose pulp sheet which has been previously treated with caustic alkali, continuously subjecting the impregnated sheet to pressure to remove excess of etherifying agent, and allowing the impregnated sheet to undergo reaction. As a modification the cellulose pulp sheet may be impregnated with the etherifying agent and caustic alkali simultaneously. The impregnation of the sheet with etherifying agent may be carried out by passing the sheet through a bath or spray of such agent and then through squeezing rollers; or by supplying the agent to the squeezing rollers, for example, by spraying the liquid on to one roller or by arranging that this shall dip into a trough, the roller being if necessary, provided with a covering of absorbent material or with an engraved surface. Aqueous solutions of etherifying agents are conveniently employed, and to them may be added wetting agents; similar additions may be made to the caustic alkali used in the preliminary step. This preliminary treatment with alkali to produce alkali cellulose may also be conducted as a continuous operation. The further reaction necessary to the etherification of the impregnated sheet may comprise standing at room temperature or at temperatures as high as 150 DEG C. or as low as 0 DEG C. In examples, wood-pulp sheets are treated in the above described manner with solutions of sodium methyl sulphate, sodium chloracetate, dimethyl sulphate, diethyl sulphate, ethylene chlorhydrin, and glyceryl monochlorhydrin, the caustic alkali being contained in the solution of the etherifying agent or the cellulose sheets being first converted into alkali cellulose. The Specification as open to inspection under Sect. 91 refers to the production of cellulose ethers in general; and it includes examples of the use of propylene oxide as the etherification reagent to give a product soluble in water, and of benzyl chloride to give a product insoluble in all solvents and somewhat water repellent. This subject-matter does not appear in the Specification as accepted.
GB21508/36A 1935-08-01 1936-08-04 Improvements in or relating to the production of cellulose ethers Expired GB482885A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US482885XA 1935-08-01 1935-08-01

Publications (1)

Publication Number Publication Date
GB482885A true GB482885A (en) 1938-04-04

Family

ID=21953731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21508/36A Expired GB482885A (en) 1935-08-01 1936-08-04 Improvements in or relating to the production of cellulose ethers

Country Status (1)

Country Link
GB (1) GB482885A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2635403A1 (en) * 1976-08-06 1978-02-09 Fritz Loedige METHOD OF PREPARING CELLULOSE ETHERS
KR20180038982A (en) * 2016-10-07 2018-04-17 신에쓰 가가꾸 고교 가부시끼가이샤 Low-substituted hydroxypropyl cellulose, production method thereof, and solid preparation
US10882923B2 (en) 2016-10-07 2021-01-05 Shin-Etsu Chemical Co., Ltd. Low-substituted hydroxypropyl cellulose, production method thereof, and solid preparation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2635403A1 (en) * 1976-08-06 1978-02-09 Fritz Loedige METHOD OF PREPARING CELLULOSE ETHERS
KR20180038982A (en) * 2016-10-07 2018-04-17 신에쓰 가가꾸 고교 가부시끼가이샤 Low-substituted hydroxypropyl cellulose, production method thereof, and solid preparation
CN107915780A (en) * 2016-10-07 2018-04-17 信越化学工业株式会社 Low-substituted hydroxypropyl cellulose, its production method and solid pharmaceutical preparation
EP3308775A1 (en) * 2016-10-07 2018-04-18 Shin-Etsu Chemical Co., Ltd. Low-substituted hydroxypropyl cellulose, production method thereof, and solid preparation
US10513565B2 (en) 2016-10-07 2019-12-24 Shin-Etsu Chemical Co., Ltd. Low-substituted hydroxypropyl cellulose, production method thereof, and solid preparation
US10882923B2 (en) 2016-10-07 2021-01-05 Shin-Etsu Chemical Co., Ltd. Low-substituted hydroxypropyl cellulose, production method thereof, and solid preparation
CN107915780B (en) * 2016-10-07 2021-05-28 信越化学工业株式会社 Low-substituted hydroxypropyl cellulose, method for producing the same, and solid preparation

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