申请人:XI'AN MODERN CHEMISTRY RESEARCH INSTITUTE
公开号:US20170342003A1
公开(公告)日:2017-11-30
Disclosed is a process for the preparation of 1,3,3,3-tetrafluoropropene, comprising: (a) a compound having the formula CF
3-x
Cl
x
CHClCHF
2-y
Cl
y
and in the presence of a compound catalyst, undergoes, through n serially-connected reactors, gas-phase fluorination with hydrogen fluoride, producing 1,2,3-trichloro-1,1,3-trifluoropropane, and 1,2-dichloro-1,1,3,3-tetrafluoropropane; in said formula, x=1, 2 or 3; y=1 or 2, and 3≦x+y≦5; (b) 1,2,3-trichloro-1,1,3-trifluoropropane, and 1,2-dichloro-1,1,3,3-tetrafluoropropane undergo, in the presence of a dehalogenation catalyst, gas-phase dehalogenation with hydrogen, producing 3-chloro-1,3,3-trifluoropropene, and 1,1,3,3-tetrafluoropropene; (c) 3-chloro-1,3,3-trifluoropropene and 1,1,3,3-tetrafluoropropene undergo, in the presence of a fluorination catalyst, gas-phase fluorination with hydrogen fluoride, producing 1,3,3,3-tetrafluoropropene. The present invention is primarily used to produce 1,3,3,3-tetrafluoropropene.
本发明公开了一种制备1,3,3,3-四氟丙烯的方法,包括:(a) 在化合物催化剂的存在下,具有公式CF3-xClxCHClCHF2-yCly的化合物通过n个串联反应器,在气相氟化氢的作用下进行气相氟化反应,生成1,2,3-三氯-1,1,3-三氟丙烷和1,2-二氯-1,1,3,3-四氟丙烷;在该式中,x=1、2或3;y=1或2,且3≦x+y≦5;(b) 在去卤化催化剂的存在下,1,2,3-三氯-1,1,3-三氟丙烷和1,2-二氯-1,1,3,3-四氟丙烷在气相氢的作用下进行气相去卤反应,生成3-氯-1,3,3-三氟丙烯和1,1,3,3-四氟丙烯;(c) 在氟化催化剂的存在下,3-氯-1,3,3-三氟丙烯和1,1,3,3-四氟丙烯在气相氟化氢的作用下进行气相氟化反应,生成1,3,3,3-四氟丙烯。本发明主要用于生产1,3,3,3-四氟丙烯。