Solvent scrubbing recovery of lactide and other dimeric cyclic esters
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United States of America Patent
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Nov 30, 1993
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N/A
app pub date -
Jan 28, 1992
filing date -
Oct 23, 1990
priority date (Note) -
Expired
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Abstract
An improved process for the recovery of lactide or other dimeric cyclic ester from a gas stream containing the cyclic ester and such hydroxylic impurities as water and open-chain hydroxycarboxylic acids, by scrubbing the gas stream with a water immiscible solvent, such as, a non-polar hydrocarbon, a cycloaliphatic hydrocarbon or a halogenated hydrocarbon solvent, at a temperature at which the cyclic ester and the open-chain hydroxycarboxylic acids are scrubbed from the gas stream and any water present in the gas stream is carried away. The crude cyclic ester-acid composition is separated from the solvent and purified by extracting the acid impurities therefrom. The acid impurities are recovered and recycled.
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