Viscosity reduction of cellulose derivatives

Details Viscosity reduction of cellulose derivatives Viscosity reduction of cellulose derivatives

C - Chemistry, Metallurgy

08

B

260/213

C08B 3/00 (2006.01) C08B 3/24 (2006.01) C08B 11/00 (2006.01) C08B 11/20 (2006.01)

Patent

CA 1065312

A B S T R A C T Cellulose ethers or esters of high molecular weight are treated in a known manner with a hydrogen halide to degrade them to a very low molecular weight. Then they are decolorized by treatment with gaseous sulfur dioxide. Remaining traces of hydrogen halide and/or sulfur dioxide are conveniently removed by treatment with a mild alkaline treatment, such as ammonia or sodium bicarbonate.

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