Title:
PROCESSES FOR PURIFYING GLYCOL ETHERS
Document Type and Number:
WIPO Patent Application WO/2022/241689
Kind Code:
A1
Abstract:
A processes for purifying glycol ethers, comprises (a) providing a glycol ether to a first vessel, the glycol ether, the glycol ether having the following formula: R 1-O- (CHR 2CHR 3) O) nR 4; wherein R 1 is an alkyl group having 1 to 9 carbon atoms or a phenyl group; wherein R 2 and R 3 each individually is hydrogen, a methyl group or an ethyl group, provided that when R 3 is a methyl group or an ethyl group, R 2 is hydrogen and provided that when R 2 is a methyl group or an ethyl group, R 3 is hydrogen; wherein R 4 is hydrogen, an alkyl group having 1 to 4 carbon atoms, an acetyl group, or a propionyl group; and wherein n is an integer of 1 to 3; (b) filling the first vessel with inert gas; (c) heating the glycol ether in the first vessel to a sub-boiling temperature, wherein the sub-boiling temperature is at least 15℃ less than the normal boiling point of the glycol ether; (d) cooling the vapor from the first vessel in a second vessel to provide a liquid; and (e) contacting the glycol ether with a mixed bed of ion exchange resins comprising cationic exchange resins and anionic ion exchange resins.
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Inventors:
JIANG QI (CN)
OHBA KAORU (JP)
LIU YUJUN (US)
OHBA KAORU (JP)
LIU YUJUN (US)
Application Number:
PCT/CN2021/094703
Publication Date:
November 24, 2022
Filing Date:
May 19, 2021
Export Citation:
Assignee:
DOW GLOBAL TECHNOLOGIES LLC (US)
JIANG QI (CN)
OHBA KAORU (JP)
LIU YUJUN (US)
JIANG QI (CN)
OHBA KAORU (JP)
LIU YUJUN (US)
International Classes:
B01J41/07; B01J39/05; B01J39/07; B01J41/12; C08G65/30
Domestic Patent References:
| WO2021000318A1 | 2021-01-07 |
Foreign References:
| CN109232878A | 2019-01-18 | |||
| US5770766A | 1998-06-23 | |||
| CN108367286A | 2018-08-03 |
Other References:
SHI， NUO: "The Purification and Electronic Grade Preparation Process of Propylene Glycol Methyl Ether", 《CHINESE DOCTORAL DISSERTATION & MASTER'S THESE FULL-TEXT DATABASE(MASTER) ENGINEERING SCIENCE AND TECHNOLOGY I》, 15 July 2019 (2019-07-15), ISSN: 1674-0246
Attorney, Agent or Firm:
WU, FENG & ZHANG (CN)
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