Co-vaporization process for preparing lactide
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United States of America Patent
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Mar 23, 1993
Grant Date -
N/A
app pub date -
Jun 24, 1991
filing date -
Jun 24, 1991
priority date (Note) -
Expired
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Abstract
A distillation process for converting lactic acid oligomer to lactide wherein the oligomer is depolymerized in the presence of a co-vaporizable solvent at a temperature and pressure which forms a vapor fraction comprising water, lactide, lactic acid and solvent, and the vapor fraction is condensed and the lactide is recovered from the condensate.
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