METHOD FOR PRODUCING GLYCOLIDE

Title:

METHOD FOR PRODUCING GLYCOLIDE

Document Type and Number:

WIPO Patent Application WO/2010/073512

Kind Code:

A1

Abstract:

A method for producing glycolide which comprises: a step (1) wherein a mixture comprising a glycolic acid oligomer and a high-boiling polar organic solvent is refluxed by heating under atmospheric or reduced pressure, while conducting the whole refluxing treatment within a reflux time of 0.1 to 20 hours under such conditions that substantially the total amount of the distillate distilled from the reflux system containing said mixture is refluxed to the reflux system; a step (2) wherein depolymerization is conducted by heating the mixture after the completion of the total refluxing treatment, or a mixture that is prepared by adding said high-boiling polar organic solvent to the glycolic acid oligomer component collected from the mixture after the completion of the total refluxing treatment; and a step (3) wherein glycolide is recovered from the co-distillate.

Inventors:

SUZUKI SHIGERU (JP)
YAMANE KAZUYUKI (JP)
ONO TOSHIHIKO (JP)
SUNAGAWA KAZUHIKO (JP)

Application Number:

PCT/JP2009/006713

Publication Date:

July 01, 2010

Filing Date:

December 09, 2009

Export Citation:

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Assignee:

KUREHA CORP (JP)
SUZUKI SHIGERU (JP)
YAMANE KAZUYUKI (JP)
ONO TOSHIHIKO (JP)
SUNAGAWA KAZUHIKO (JP)

International Classes:

C07D319/12; C08G63/08

Domestic Patent References:

WO2002014303A1	2002-02-21
WO2002014303A1	2002-02-21

Foreign References:

JPH07138253A	1995-05-30
JPH05287056A	1993-11-02
JP2002114775A	2002-04-16
JP2008001733A	2008-01-10
JP2007332113A	2007-12-27
JP2004523596A	2004-08-05
JPH09328481A	1997-12-22
JP2004523596A	2004-08-05

Other References: