PROCESS FOR THE JOINT PREPARATION OF 1, 3, 3, 3-TETRAFLUOROPROPENE AND 2, 3, 3, 3-TETRAFLUOROPROPENE
申请人:XI'AN MODERN CHEMISTRY RESEARCH INSTITUTE
公开号:US20170320797A1
公开(公告)日:2017-11-09
A process for the joint preparation of 1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropene, comprising: (a) starting materials comprising at least one compound having the structure of formula I, II or III is reacted with hydrogen fluoride, producing 1,2,3-trichloro-3,3-difluoropropene, 1,2,3-trichloro-1,1,2-trifluoropropane, and 1,2,3-trichloro-1,1,3-trifluoropropane; in the compounds of said formulae CF
2−m
Cl
m
=CCl-CHF
2−n
Cl
n
(Formula I), CF
3−p
Cl
p
CHCl=CH
2
Cl (Formula II), and CF
3−x
Cl
x
CF
2−y
Cl
y
CHF
2−z
Cl
z
(Formula III), m=0, 1, 2; n=1, 2; p=2, 3; x=1, 2, 3; y=1, 2; z=1, 2 and 4≦x+y+z≦6; (b) the 1,2,3-trichloro-3,3-difluoropropene, 1,2,3-trichloro-1,1,2-trifluoropropane and 1,2,3-trichloro-1,1,3-trifluoropropane undergo dechlorination, producing 3-chloro-3,3-difluoropropyne, 3-chloro-2,3,3-trifluoropropene and 3-chloro-1,3,3-trifluoropropene; and (c) the 3-chloro-3,3-difluoropropyne, 3-chloro-2,3,3-trifluoropropene and 3-chloro-1,3,3-trifluoropropene are reacted with hydrogen fluoride, simultaneously yielding 1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropen.
FIG.
1
is designated as the drawing of the Abstract.