Process for the preparation of cellulose alkyl ethers

Details Process for the preparation of cellulose alkyl ethers Process for the preparation of cellulose alkyl ethers

C - Chemistry, Metallurgy

08

B

260/217.4

C08B 11/02 (2006.01)

Patent

CA 1086313

PROCESS FOR THE PREPARATION OF CELLULOSE ALKYL ETHERS ABSTRACT OF THE DISCLOSURE The present invention is related to a new process for producing cellulose C1-C4-alkyl ethers by subjecting cellulose to reaction with an alkali metal hydroxide and subjecting the resulting alkali metal salt of cellulose to reaction with an alkyl halide wherein the alkyl group contains 1 to 4 carbon atoms. The new process is characterized by subjecting 1 part by weight of cellulose to reaction with 0.5 to4parts by weight of the alkyl halide in a positive mixer having a fast-running mixing appliance and a container with adjustable internal pressure and cooling of the internal container wall, adding the alkali metal hydroxide in a concentrated aqueous solution or in a substantially water- free and finely divided state, and adjusting the pressure in the reaction vessel with cooling in such a way that the temperature of the reaction mixture remains in the range of from 15 to 40°C., and raising the temperature of the reaction mixture after termi- nation of the alkalization to from 50 to 100°C. - 1a -

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