PROCESS FOR THE PREPARATION OF CELLULOSE ALKYL ETHERS

摘要

PROCESS FOR THE PREPARATION OF CELLULOSE ALKYL ETHERS 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 waterfree 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.degree.C., and raising the temperature of the reaction mixture after termination of the alkalization to from 50 to 100.degree.C. - 1a