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Title:
METHOD FOR SYNTHESIZING LACTIDE BY MEANS OF CATALYSIS OF LACTIC ACID
Document Type and Number:
WIPO Patent Application WO/2017/143622
Kind Code:
A1
Abstract:
The present invention relates to a method for synthesizing lactide by means of lactic acid catalysis. In the method, a nano-particle aqueous dispersion of zinc oxide is used as a catalyst, and lactide is synthesized by means of catalysis of lactic acid. The present invention has four technical characteristics: 1, the zinc oxide nano aqueous dispersion catalyst has a sufficient area, and the size of each nano particle is only 30 nm to 40 nm, so that there is a sufficient contact area between the substrate (lactic acid) and the catalyst; 2, the new catalyst has a moderate catalytic effect on a polymerization reaction, so that the molecular weight of a prepolymer ranges from 400 g/mol to 1500 g/mol, thereby facilitating a depolymerization reaction; 3, the new catalyst is stable, thereby preventing the catalyst from being oxidized or carbonized; and 4, the new catalyst has low toxicity and has low harm to a human body.

Inventors:
HU YUNZI (CN)
LIAN SIQI (CN)
DAI WEILIE (CN)
Application Number:
PCT/CN2016/075167
Publication Date:
August 31, 2017
Filing Date:
March 01, 2016
Export Citation:
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Assignee:
THE HONG KONG RES INST OF TEXTILES AND APPAREL LTD (CN)
International Classes:
C07D319/12; B01J23/06; B01J35/10
Foreign References:
CN1583740A2005-02-23
US6277951B12001-08-21
Other References:
CHENG, CHAO: "The Selection of Catalyst to Prepare Lactide and an Initial Analysis of Reaction Mechanism", SCIENCE -ENGINEERING (A), CHINA MASTER'S THESES FULL-TEXT DATABASE, 31 January 2006 (2006-01-31), pages 1 - 8, XP055571152
CHEN, JIA ET AL.: "Advances of Catalysts for Synthesizing Lactide", CHEMICAL RESEARCH AND APPLICATION, vol. 19, no. 4, 30 April 2007 (2007-04-30), pages 358, XP009511551
QIU, KUI ET AL.: "On Lactide Synthesis Method and Condition of Reaction", JOURNAL OF CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY, vol. 8, no. 4, 31 December 2006 (2006-12-31), pages 16 - 18, XP009511541, ISSN: 1673-1980
See also references of EP 3421459A4
Attorney, Agent or Firm:
SHENZHEN STANDARD PATENT & TRADEMARK AGENT LTD. (CN)
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