One-step continuous process for preparing cyclic esters

Details One-step continuous process for preparing cyclic esters One-step continuous process for preparing cyclic esters

1990-05-03

1991-08-27

Ivy, C. Warren

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549518, C07D31900

Patent

active

050434586

ABSTRACT:
A continuous, gas-assisted atmospheric process for preparing cyclic esters of alpha-hydroxycarboxylic acids, such as lactide, which comprises feeding the reactants into a reactor having means for introducing an inert gas at the operating temperature, forming a reaction mass having cyclic esters in the reactor, passing a flow of said inert gas through said reactor whereby cyclic esters are swept from the reaction mass into a gaseous product stream, and recovering the cyclic esters therefrom.

REFERENCES:
patent: 3457280 (1969-07-01), Schmitt et al.
patent: 4835293 (1989-05-01), Bhatia

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