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Title:
METHOD FOR CONTINUOUS PREPARATION OF 2,3,3,3-TETRAFLUOROPROPENE
Document Type and Number:
WIPO Patent Application WO/2020/133554
Kind Code:
A1
Abstract:
Disclosed is a method for the continuous preparation of 2,3,3,3-tetrafluoropropene. The method comprises: subjecting ethylene and carbon tetrachloride, which act as raw materials, to a liquid-phase catalytic telomerization reaction in the presence of a composite catalyst to obtain a reaction product; and subjecting the reaction product to two-stage membrane separation and purification, then sequentially subjecting same to a primary high-temperature cracking reaction, a gas phase chlorination reaction, a secondary high-temperature cracking reaction, a primary gas phase catalytic fluorination reaction, and a secondary gas phase catalytic fluorination reaction so as to obtain a reaction product, and condensing the product of the secondary gas phase catalytic fluorination reaction and rectifying same to obtain the product 2,3,3,3-tetrafluoropropene. By means of the present invention, the continuous preparation of an HFO-1234yf product is achieved, wherein the product of the primary high-temperature cracking reaction, the gas phase chlorination reaction, the secondary high-temperature cracking reaction, and the primary gas phase catalytic fluorination reaction can be directly used for the next reaction without needing to be purified; and the product of the liquid-phase catalytic telomerization reaction is separated via different two-stage membranes, and the composite catalyst can be recycled. The present invention has the advantages of having a simple process, being low in cost and using readily available raw materials.

Inventors:
LV YANG (CN)
LI HONGFENG (CN)
JIANG QI (CN)
MA LIYONG (CN)
WANG JINMING (CN)
Application Number:
CN2019/000248
Publication Date:
July 02, 2020
Filing Date:
December 17, 2019
Export Citation:
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Assignee:
LV YANG (CN)
International Classes:
C07C17/35; C07C17/389; C07C21/18; C07C17/275; C07C19/01
Domestic Patent References:
WO2017178857A12017-10-19
Foreign References:
CN109796300A2019-05-24
CN107074697A2017-08-18
Attorney, Agent or Firm:
NINGBO AOSHENG PATENT AGENT OFFICE (CN)
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