Title:
METHOD FOR SEPARATING ETHYLENE GLYCOL FROM ETHYLENE GLYCOL DIACETATE BY USING SULFOLANE AS ENTRAINER
Document Type and Number:
WIPO Patent Application WO/2023/241727
Kind Code:
A1
Abstract:
The present invention belongs to the field of chemical separation, and disclosed is a method for separating ethylene glycol from ethylene glycol diacetate by using sulfolane as an entrainer. A mixture of ethylene glycol and ethylene glycol diacetate is subjected to extractive rectification under the action of an entrainer, and ethylene glycol is then separated at the top of an extractive rectification tower; the residual materials separated from the tower bottom are subjected to extractive rectification again, and the target product, i.e. ethylene glycol diacetate, is then separated at the top of an entrainer recovery tower; and the entrainer sulfolane is separated at the tower bottom for reuse, and the obtained sulfolane is then circulated into the extractive rectification tower again. By means of the specific setting of the number of tower plates, the temperature, the pressure and the feeding position of the synergistic extractive rectification tower and the entrainer recovery tower, the yield of ethylene glycol is greater than or equal to 99.50%, the mass purity of ethylene glycol is greater than or equal to 99.50%, the yield of ethylene glycol diacetate is greater than or equal to 99.80%, and the mass purity of ethylene glycol diacetate is greater than or equal to 99.90%.
Inventors:
LI JIASHU (CN)
LI JINLONG (CN)
WANG FANG (CN)
LI JINLONG (CN)
WANG FANG (CN)
Application Number:
PCT/CN2023/107635
Publication Date:
December 21, 2023
Filing Date:
July 17, 2023
Export Citation:
Assignee:
UNIV CHANGZHOU (CN)
International Classes:
C07C29/84; C07C31/20; C07C67/54; C07C69/16
Foreign References:
| CN115160109A | 2022-10-11 | |||
| CN109369396A | 2019-02-22 | |||
| US4525245A | 1985-06-25 |
Other References:
WANG FANG, WEN WEI, YAN LINYING, HU SONG, GUO YICANG, CAO YAN, LIU YINGJIE, LI JINLONG: "Research on Thermodynamic Properties of Binary Mixture of Ethylene Glycol and Ethylene Glycol Diacetate", CHEMICAL REACTION ENGINEERING AND TECHNOLOGY., vol. 37, no. 1, 1 February 2021 (2021-02-01), pages 39 - 46, XP093117905, DOI: 10.11730/j.issn.1001-7631.2021.01.0039.08
Attorney, Agent or Firm:
CHANGZHOU INNOVATION PATENT AGENCY (CN)
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