PROCESS FOR THE JOINT PREPARATION OF 1, 3, 3, 3-TETRAFLUOROPROPENE AND 2, 3, 3, 3-TETRAFLUOROPROPENE

摘要

A process for the joint preparation of 1, 3, 3, 3-tetrafluoropropene and 2, 3, 3, 3-tetrafluoropropene, comprising: a. a starting material of 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-mCl m＝CCl-CHF 2-nCl n (formula I), CF 3-pCl pCHCl＝CH 2Cl (formula II), and CF 3-xCl xCF 2-yCl yCHF 2-zCl 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-fluoro-3, 3-difluoropropyne, 3-fluoro-2, 3, 3-trifluoropropene, and 3-fluoro-1, 3, 3-trifluoropropene; c. the 3-fluoro-3, 3-difluoropropyne, 3-fluoro-2, 3, 3-trifluoropropene, and 3-fluoro-1, 3, 3-trifluoropropene are reacted with hydrogen fluoride, simultaneously yielding 1, 3, 3, 3-tetrafluoropropene and 2, 3, 3, 3-tetrafluoropropene.