Title:
METHOD FOR REFINING BIO-BASED PROPYLENE GLYCOL
Document Type and Number:
WIPO Patent Application WO/2020/063425
Kind Code:
A1
Abstract:
A method for refining bio-based propylene glycol, wherein impurities having a boiling point close to that of propylene glycol are separated. In the present method, C5-C20 lipophilic alcohol compounds, C5-C20 alkanes and/or C4-C20 lipophilic ketone compounds are used as azeotropic agents to implement azeotropy with bio-based propylene glycol to obtain an azeotrope containing propylene glycol; the azeotropic agents in the azeotrope are then separated and removed to obtain crude propylene glycol; and the crude propylene glycol is further purified to obtain propylene glycol.
Inventors:
YUAN YI (CN)
Application Number:
PCT/CN2019/106551
Publication Date:
April 02, 2020
Filing Date:
September 19, 2019
Export Citation:
Assignee:
CHANGCHUN MEIHE SCIENCE AND TECH DEVELOPMENT CO LTD (CN)
International Classes:
C07C29/82; B01D3/36; C07C31/20
Foreign References:
| CN107001206A | 2017-08-01 | |||
| US5425853A | 1995-06-20 | |||
| US5423955A | 1995-06-13 | |||
| CN108191608A | 2018-06-22 | |||
| US4935102A | 1990-06-19 | |||
| US5423955A | 1995-06-13 |
Other References:
See also references of EP 3858809A4
Attorney, Agent or Firm:
CHINA PATENT AGENT (H.K.) LTD. (CN)
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