The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 14, 2023
Filed:
Sep. 19, 2019
Applicant:
Changchun Meihe Science and Technology Development Co., Ltd., Changchun, CN;
Inventor:
Yi Yuan, Changchun, CN;
Assignee:
Changchun Meihe Science and Technology Development Co., Ltd., Changchun, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 29/82 (2006.01); B01D 3/36 (2006.01); C07C 29/86 (2006.01);
U.S. Cl.
CPC ...
C07C 29/82 (2013.01); B01D 3/36 (2013.01); C07C 29/86 (2013.01);
Abstract
The invention provides a process for refining bio-based propylene glycol, wherein impurities having boiling points close to that of propylene glycol are separated. In this process, C-Coleophilic alcohol compounds, C-Calkanes and/or C-Coleophilic ketone compounds are subjected to azeotropism as an azeotropic solvent together with the bio-based propylene glycol to obtain an azeotrope containing propylene glycol. Then the azeotropic solvent in the azeotrope is separated to obtain a crude propylene glycol which is further purified to obtain propylene glycol.