Process for rapid conversion of oligomers to cyclic esters
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United States of America Patent
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Feb 25, 1992
Issued Date -
N/A
app pub date -
Sep 21, 1990
filing date -
May 8, 1990
priority date (Note) -
Expired
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Abstract
A gas-assisted process for the rapid conversion of oligomers of alpha-hydroxycarboxylic acids, esters or nitrogen salts thereof to cyclic esters in high yields and high states of purity. An inert gas is intimately contacted with the oligomer so as to create a large interfacial area. The large interfacial area permits removal of the cyclic ester substantially as fast as the cyclic ester is formed.
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