Method for co-producing various alkenyl halides and hydrofluoroalkanes

A method for co-producing alkenyl halides and hydrofluoroalkanes, comprising following steps of:

• (a) introducing cis-1-chloro-3,3,3-trifluoropropene into a first reactor where an isomerization reaction occurs in the presence of a first catalyst to obtain a first reactor reaction product, wherein a temperature of the isomerization reaction is 200-400° C., and an air velocity of the isomerization reaction is 300-1000 h−1;
• (b) introducing the first reactor reaction product obtained in the Step (a) into a first rectification column to obtain a product of trans-1-chloro-3,3,3-trifluoropropene and a first rectification column bottom liquid;
• (c) mixing 30-70 wt % of the trans-1-chloro-3,3,3-trifluoropropene obtained in the Step (b) with hydrogen fluoride, and then introducing the trans-1-chloro-3,3,3-trifluoropropene and the hydrogen fluoride in a second reactor where a reaction occurs in the presence of a catalyst to obtain a second reactor reaction product, wherein a molar ratio of the hydrogen fluoride to the trans-1-chloro-3,3,3-trifluoropropene is 8-20:1, a temperature of the reaction is 180-400° C., and a space velocity of the reaction is 300-1000 h−1;
• (d) introducing the second reactor reaction product obtained in the Step (c) into a phase separator for separation to obtain an inorganic phase and an organic phase;
• (e) introducing the organic phase obtained in the Step (d) into a second rectification column to obtain a product of trans-1,3,3,3-tetrafluoropropene and a second rectification column bottom liquid;
• (f) introducing the second rectification column bottom liquid obtained in the Step (e) into a third rectification column to obtain a product of cis-1,3,3,3-tetrafluoropropene and a third rectification column bottom liquid;
• and
• (g) introducing the third rectification column bottom liquid obtained in the Step (f) into a fourth rectification column to obtain a product of 1,1,1,3,3-pentafluoropropane and a fourth rectification column bottom liquid.