Acetylation of cellulose in densified gas
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United States of America Patent
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Sep 22, 2015
Grant Date -
Feb 21, 2013
app pub date -
Aug 20, 2012
filing date -
Aug 19, 2011
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Abstract
Cellulose acetates and processes for producing same. The process involves esterifying a cellulose containing material in the presence of a densified gas such as supercritical carbon dioxide to form a cellulose acetate product having a degree of substitution less than 3. The cellulose acetate preferably is sulfate-free.
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