Process for extracting water and acetic acid from the aqueous phase of cellulose acetate
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United States of America Patent
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Sep 16, 1997
Issued Date -
N/A
app pub date -
Apr 30, 1996
filing date -
Jul 29, 1991
priority date (Note) -
Expired
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Abstract
A new process has been developed for separating the water and acetic acid present in the aqueous phase contained in cellulose acetate flakes precipitated from esterification solutions of cellulose. The process includes the step of simultaneously extracting water and acetic acid from the aqueous phase with supercritical carbon dioxide until the content of water and acetic acid in the flakes is substantially reduced.
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