Co-production preparation method of 2, 3, 3, 3-tetrafluoropropene and 1-chloro-3, 3, 3-trifluoropropene

The invention relates to a co-production preparation method of 2, 3, 3, 3-tetrafluoropropene and 1-chloro-3, 3, 3-trifluoropropene, and the co-production preparation method comprises the following steps: A1, a telomerization step: monochlorofluoromethane and trifluoroethylene are subjected to a pressurized telomerization reaction under the action of a telomerization catalyst to prepare 3-chloro-1, 1, 1, 2-tetrafluoropropane; the telomerization catalyst is a Lewis acid catalyst or a mixed catalyst of the Lewis acid catalyst and dichloromethane; the 3-chloro-1, 1, 1, 2-tetrafluoropropane is subjected to a dehydrochlorination reaction and a dehydrofluorination reaction at the same time under the action of a composite dehalogenation catalyst, 2, 3, 3, 3-tetrafluoropropene and 1-chloro-3, 3, 3-trifluoropropene are obtained, and the composite dehalogenation catalyst is prepared from an oxide or fluoride of at least one of Al, Mg or Cr and activated carbon powder. The method has the advantages of simple process, mil