Solventless dimeric cyclic ester distillation process

Details Solventless dimeric cyclic ester distillation process Solventless dimeric cyclic ester distillation process

1992-03-13

1993-08-17

Manoharan, Virginia

Distillation: processes, separatory

Miscellaneous separatory

203DIG19, 203DIG21, 549274, B01D 300, C07D31910

Patent

active

052365603

ABSTRACT:
A dimeric cyclic ester of an alpha-hydroxycarboxylic acid (lactide) is separated and recovered from a vapor product stream containing the cyclic ester, the corresponding lower-boiling hydroxycarboxylic acid (lactic), higher-boiling oligomeric hydroxycarboxylic acid and water without the use of solvents. More specifically, the vapor stream is condensed to obtain a condensate containing substantially all the cyclic ester, and the condensate is refined by distillation means alone to recover the cyclic ester substantially free of water, the alpha-hydroxycarboxylic acid and the higher-boiling oligomers.

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