Process for preparing alkali metal salt of carboxymethyl...

Details Process for preparing alkali metal salt of carboxymethyl... Process for preparing alkali metal salt of carboxymethyl...

C - Chemistry, Metallurgy

08

B

260/217.2

C08B 11/12 (2006.01)

Patent

CA 1177827

Abstract of the Disclosure A process for preparing a form of carboxymethyl cellulose which exhibits superior rheological and fluid loss character- istics in aqueous calcium chloride solutions which comprises conducting causticization of high molecular weight cellulose in the absence of oxygen, at a temperature less than 35°C, in in aqeuous solution containing 86.9 + 2% by weight isopropanol, at an isopropanl-water solution to cellulose weight ratio from 2 to 1 to 7.5 to 1, and in the presence of sufficient. alkali metal hydroxide such that the alkali metal hydroxide to mono- chloroacetic acid molar ratio during the subsequent etheri- fication of the alkali cellulose is greater than 2.00 to 1, wherein the monochloroacetic acid utilized contains less than about 2% by weight dichloroacetic acid.

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