Atmospheric pressure process for preparing pure cyclic esters

Details Atmospheric pressure process for preparing pure cyclic esters Atmospheric pressure process for preparing pure cyclic esters

1987-02-24

1989-05-30

Hollrah, Glennon H.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C00Z31900

Patent

active

048352934

ABSTRACT:
This invention relates to an improved process for preparing highly pure cyclic esters by heating a polymer of the corresponding .alpha.-hydroxy acid or its ester or a copolymer of .alpha.-hydroxy acid or its ester and a thermally stable polyether in the presence of an inert gas at atmospheric pressure. The cyclic ester is carried from the reaction with the inert gas to a solvent system.

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Abstract of EP 47473 (03/82).

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