Treating cellulosic sheet material

Details Treating cellulosic sheet material Treating cellulosic sheet material

C - Chemistry, Metallurgy

08

B

260/213

C08B 1/02 (2006.01) C08B 3/06 (2006.01)

Patent

CA 1333598

Cellulosic sheet material is processed in preparation for esterification for example acetylation to produce cel- lulose acetate, by treating the sheet material with water and then feeding the wetted material into a machine that simultaneously shreds and dries the material. The condi- tions in the machine are carefully controlled (outlet temperature not in excess of 110°C and moisture content 4- 15% by weight) to ensure that the cellulosic material does not become deactivated towards esterification. The method enables low alpha content cellulosic material supplied in the form of high density sheet to be acetylated to produce high quality cellulose acetate flake.

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