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Patent Searching and Data


Title:
METHOD FOR PREPARING LACTIDE FROM ALKYL LACTATE
Document Type and Number:
WIPO Patent Application WO/2012/148108
Kind Code:
A2
Abstract:
The present invention relates to a method for preparing lactide from alkyl lactate, comprising: a step of polymerizing alkyl lactate under a lead (Pb)-based catalyst so as to prepare lactic acid oligomers; and a step of depolymerizing said lactic acid oligomers to obtain lactide. The method of the present invention may use alkyl lactate, prepared by an esterification reaction between a fermented lactic acid solution and alcohol, directly without a separate dehydrating process such as moisture adsorption or pervaporation using zeolite, thus simplifying processes. In addition, the method of the present invention eliminates the necessity of additional hydrolysis for preparing lactic acid after the preparation of alkyl lactate, which might otherwise be required to prepare lactide. Further, the method of the present invention has the advantage of preparing lactide at a lower temperature than that of existing methods in which lactide is prepared after lactic acid is obtained by hydrolysis.

Inventors:
CHANG JONG SAN (KR)
HWANG DONG WON (KR)
LEE JUNG HO (KR)
HWANG YOUNG KYU (KR)
LEE U HWANG (KR)
Application Number:
PCT/KR2012/002869
Publication Date:
November 01, 2012
Filing Date:
April 16, 2012
Export Citation:
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Assignee:
KOREA RES INST CHEM TECH (KR)
CHANG JONG SAN (KR)
HWANG DONG WON (KR)
LEE JUNG HO (KR)
HWANG YOUNG KYU (KR)
LEE U HWANG (KR)
International Classes:
C12P7/56; C07C55/28; C07C59/08; C12P7/40
Foreign References:
JP2002300898A2002-10-15
JP2000086652A2000-03-28
Attorney, Agent or Firm:
FIRSTLAW P.C. (275-7 Yangjae-Dong Seocho-Ku, Seoul 137-739, KR)
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Claims: