Solvent scrubbing recovery of lactide and other dimeric cyclic esters
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United States of America Patent
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May 26, 1992
Grant Date -
N/A
app pub date -
Oct 23, 1990
filing date -
Oct 23, 1990
priority date (Note) -
Expired
status (Latency Note)
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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 nonpolar water-immiscible solvent at a temperature at which the cyclic ester is removed from the solvent and any water present in the gas stream is vaporized from the solvent. The cyclic ester is recovered from the solvent in a high state of optical purity.
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