Title:
METHOD FOR SYNTHESIZING DIFLUOROMETHANE BY MEANS OF GAS PHASE CATALYSIS
Document Type and Number:
WIPO Patent Application WO/2022/028236
Kind Code:
A1
Abstract:
Disclosed is a method for synthesizing difluoromethane by means of gas-phase catalysis. The method comprises: (a) introducing difluoromethane and hydrogen fluoride into a first reactor under the action of a catalyst for a catalytic reaction, so as to obtain a first reaction product; (b) introducing the first reaction product into a deacidification separation tower, so as to obtain a tower bottom component and a tower top component; (c) separating hydrogen chloride from the tower top component obtained in step (b), so as to obtain a mixed material containing difluoromethane; (d) introducing the mixed material obtained in step (c) into a purifying tower, so as to obtain a purified mixture; and (e) introducing the purified mixture obtained in step (d) into a light component removal tower so as to obtain a light component at the tower top, and drying the material at the tower bottom, so as to obtain a difluoromethane product. The method has the advantages of a simple process, mild reaction conditions, a good catalyst activity and a long service life.
Inventors:
ZHOU LIYANG (CN)
HONG JIANGYONG (CN)
YANG BO (CN)
ZHANG YAN (CN)
SHI HAOJIN (CN)
YU HUIMEI (CN)
HONG HAIGANG (CN)
HONG JIANGYONG (CN)
YANG BO (CN)
ZHANG YAN (CN)
SHI HAOJIN (CN)
YU HUIMEI (CN)
HONG HAIGANG (CN)
Application Number:
PCT/CN2021/106982
Publication Date:
February 10, 2022
Filing Date:
July 19, 2021
Export Citation:
Assignee:
ZHEJIANG QUHUA FLUOR CHEMISTRY CO LTD (CN)
International Classes:
B01J27/132; C07C17/20; B01J37/03; B01J37/08; B01J37/26; B01J37/34; C07C17/383; C07C17/395; C07C19/08
Foreign References:
| CN112047803A | 2020-12-08 | |||
| CN110818526A | 2020-02-21 | |||
| CN102895967A | 2013-01-30 | |||
| CN103319303A | 2013-09-25 | |||
| US4147733A | 1979-04-03 |
Attorney, Agent or Firm:
NINGBO AOSHENG PATENT AGENT COMPANY LIMITED. et al. (CN)
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