Solvent scrubbing recovery of lactide and other dimeric cyclic e

Details Solvent scrubbing recovery of lactide and other dimeric cyclic e Solvent scrubbing recovery of lactide and other dimeric cyclic e

1992-01-28

1993-11-30

Ivy, C. Warren

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31900

Patent

active

052667065

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.

REFERENCES:
patent: 1095205 (1914-05-01), Gruter et al.
patent: 2668162 (1954-02-01), Lowe
patent: 4727163 (1988-02-01), Bellis
patent: 4835293 (1989-05-01), Bhatia
patent: 5117008 (1992-05-01), Bhatia et al.

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