Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1981-12-10
1983-08-30
Clingman, A. Lionel
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
252 85C, C08G 5900
Patent
active
044018134
ABSTRACT:
A process for preparing a form of carboxymethyl cellulose which exhibits superior rheological and fluid loss characteristics in aqueous calcium chloride solutions which comprises conducting causticization of high molecular weight cellulose in the absence of oxygen, at a temperature less than 350.degree. C., in an aqueous solution containing 86.9.+-.2% by weight isopropanol, at an isopropanol-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 monochloroacetic acid molar ratio during the subsequent etherification 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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Lowell Jack L.
Nevins Michael J.
Reid Kenneth I. G.
Walter Kenneth L.
Clingman A. Lionel
NL Industries Inc.
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