Method for producing lactide and apparatus used therefor

Details Method for producing lactide and apparatus used therefor Method for producing lactide and apparatus used therefor

1996-08-01

1998-09-01

Owens, Amelia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D31912

Patent

active

058012559

ABSTRACT:
The method for producing lactide includes the steps of (a) synthesizing lactide using lactic acid as a starting material; (b) discharging in gaseous states lactide synthesized and impurities formed upon synthesis in step (a); (c) liquefying gaseous components in step (b) and solidifying only lactide, to thereby separate the impurities from the thus-obtained solidified lactide; and (d) returning the separated impurities in step (c) back to the synthesis step (a). The apparatus used for the above production includes (a) a reactor for carrying out synthesis of lactide; (b) a means for gasifying synthesized lactide and impurities formed upon synthesis in the reactor (a) and discharging the resulting gaseous components; (c) a means for cooling the gaseous components to liquefy the gaseous components obtained by the means (b) and solidify only lactide; and (d) a pipe for returning to the reactor (a) components which are not solidified by the means (c).

REFERENCES:
patent: 5332839 (1994-07-01), Benecki et al.

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