METHOD FOR PURIFYING HYDROXYCARBOXYLIC ACID, METHOD FOR PRODUCING CYCLIC ESTER, AND METHOD FOR PRODUCING POLYHYDROXYCARBOXYLIC ACID

Title:

METHOD FOR PURIFYING HYDROXYCARBOXYLIC ACID, METHOD FOR PRODUCING CYCLIC ESTER, AND METHOD FOR PRODUCING POLYHYDROXYCARBOXYLIC ACID

Document Type and Number:

WIPO Patent Application WO/2008/015885

Kind Code:

A1

Abstract:

Disclosed is a method for purifying a hydroxycarboxylic acid by distillation, which is characterized by distilling an aqueous hydroxycarboxylic acid solution containing a high boiling point hydroxy compound which is composed of at least one of alcohols and phenols having a boiling point higher than that of the hydroxycarboxylic acid. Consequently, there can be obtained a hydroxycarboxylic acid suitable as a raw material for producing a polyhydroxycarboxylic acid. A polyhydroxycarboxylic acid is obtained by forming an oligomer of the hydroxycarboxylic acid by polycondensing the purified hydroxycarboxylic acid, then forming a cyclic ester composed of a dimer of the hydroxycarboxylic acid by depolymerizing the oligomer, and then ring-opening polymerizing the cyclic ester.

Inventors:

OGAWA TOMOYUKI
KIKUCHI MICHIO

Application Number:

PCT/JP2007/063751

Publication Date:

February 07, 2008

Filing Date:

July 10, 2007

Export Citation:

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Assignee:

KUREHA CORP (JP)
OGAWA TOMOYUKI
KIKUCHI MICHIO

International Classes:

C07C51/44; C07C59/06; C07D319/12; C08G63/06

Domestic Patent References:

WO2004076398A1	2004-09-10
WO2003064366A1	2003-08-07
WO2003064366A1	2003-08-07
WO2002083661A1	2002-10-24
WO2005035623A1	2005-04-21
WO2005044894A1	2005-05-19
WO2007086563A1	2007-08-02

Foreign References:

JP2004523596A	2004-08-05
JP2003514885A	2003-04-22
JPH06501268A	1994-02-10
JP2006169185A	2006-06-29
JP2002128727A	2002-05-09

Other References: