Title:
METHOD FOR REFINING GLYCOLIDE AND GLYCOLIDE OBTAINED USING SAME
Document Type and Number:
WIPO Patent Application WO/2022/089413
Kind Code:
A1
Abstract:
The present invention provides a method for refining glycolide and glycolide obtained using same. The method comprises the steps of using a solvent A to extract impurities from crude glycolide and then using a solvent B to perform recrystallization, wherein the solvent A comprises at least two solvents and the solvents are mutually soluble. In the method of the present invention, two types of polar solvents are used for the refining of crude glycolide, having a good extraction effect on acidic impurities such as glycolic acid oligomers, and the solvents being easily fully removed during solid-liquid separation and drying, thereby solving the problem of solvent residues in the refined product and achieving the technical effect of low free acid content in the product. The technical solution of the present invention has the technical advantages of easy solvent recovery and low free acid content in the product.
Inventors:
XIONG WENTAO (CN)
WANG RUI (CN)
ZHOU FEN (CN)
XIONG JINGEN (CN)
WANG RUI (CN)
ZHOU FEN (CN)
XIONG JINGEN (CN)
Application Number:
PCT/CN2021/126351
Publication Date:
May 05, 2022
Filing Date:
October 26, 2021
Export Citation:
Assignee:
CHINA PETROLEUM & CHEM CORP (CN)
SHANGHAI RES INST PETROCHEMICAL TECH SINOPEC (CN)
SHANGHAI RES INST PETROCHEMICAL TECH SINOPEC (CN)
International Classes:
C07D319/12
Foreign References:
| CN107868074A | 2018-04-03 | |||
| CN101054371A | 2007-10-17 | |||
| US20150259320A1 | 2015-09-17 | |||
| CN107868075A | 2018-04-03 | |||
| CN100999516A | 2007-07-18 | |||
| US5223630A | 1993-06-29 | |||
| CN105272958A | 2016-01-27 | |||
| CN107868075A | 2018-04-03 |
Other References:
WU QING-YUN,ZHOU WEI-YOU,HE MING-YANG,CHEN QUN: "Synthesis of Glycolide", FINE CHEMICALS, vol. 29, no. 4, 15 April 2012 (2012-04-15), pages 413 - 416, XP055924987, ISSN: 1003-5214, DOI: 10.13550/j.jxhg.2012.04.014
XIAO TIANPENGFEI,WANG RUI: "Technology Progress of Glycolide Synthesis", CHINA SCIENCE AND TECHNOLOGY INFORMATION, 1 July 2013 (2013-07-01), XP055925089, ISSN: 1001-8972, DOI: 10.3969/j.issn.1001-8972.2013.13.071
See also references of EP 4234543A4
XIAO TIANPENGFEI,WANG RUI: "Technology Progress of Glycolide Synthesis", CHINA SCIENCE AND TECHNOLOGY INFORMATION, 1 July 2013 (2013-07-01), XP055925089, ISSN: 1001-8972, DOI: 10.3969/j.issn.1001-8972.2013.13.071
See also references of EP 4234543A4
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (CN)
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