Process for the preparation of 2, 3, 3, 3-tetrafluoropropene
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United States of America Patent
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-
Jan 9, 2018
Issued Date -
N/A
app pub date -
Feb 5, 2015
filing date -
Dec 13, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Disclosed is a process for the preparation of 2,3,3,3-tetrafluoropropene, comprising the following two reaction steps: a. a compound having the formula CF3-xClxCF2-yClyCH2Cl undergoes gas-phase fluorination with hydrogen fluoride through n serially-connected reaction vessels in the presence of a compound catalyst, producing 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane; in said formula, x=1, 2, 3, y=1, 2, and 3≦x+y≦5; b. the 2,3-dichloro-1,1,1,2-tetrafluoropropane, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,3-dichloro-1,1,2,2-tetrafluoropropane undergo gas-phase dehalogenation with hydrogen in the presence of a dehalogenation catalyst, producing 2,3,3,3-tetrafluoropropene and 3-chloro-2,3,3-trifluoropropene, then separation and refining are performed, producing 2,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 2,3,3,3-tetrafluoropropene.
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International Classification(s)
- 2015 Application Filing Year
- C07C Class
- 3384 Applications Filed
- 2748 Patents Issued To-Date
- 81.21 % Issued To-Date
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- C07C Class
- 0 % this patent is cited more than
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