Method for acetylating shredded cellulosic
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United States of America Patent
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Aug 6, 1991
Issued Date -
N/A
app pub date -
Oct 17, 1990
filing date -
Jul 15, 1988
priority date (Note) -
Expired
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Abstract
Cellulosic sheet material is processed in preparation for esterification for example acetylation to produce cellulose 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 conditions in the machine are carefully controlled (outlet temperature not in excess of 110.degree. 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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