METHOD FOR PREPARING 2,3,3,3-TETRAFLUOROPROPENE

Disclosed in the present invention is a method for preparing 2,3,3,3-tetrafluoropropene. The method comprises a method for preparing 2,3,3,3-tetrafluoropropene by means of a two-step method, a method for co-producing 2,3,3,3-tetrafluoropropene and 1-chloro-2,3,3,3-tetrafluoropropene, and a method for co-producing 2,3,3,3-tetrafluoropropene and 1-chloro-3,3,3-trifluoropropene. The method for preparing 2,3,3,3-tetrafluoropropene by means of a two-step method comprises: A1. a telomerization step, involving subjecting chlorofluoromethane and trifluoroethylene to a pressure telomerization reaction under the action of a telomerization catalyst to prepare 3-chloro-1,1,1,2-tetrafluoropropane, wherein the telomerization catalyst is a Lewis acid catalyst or a mixed catalyst of a Lewis acid catalyst and dichloromethane, and A2. a dehydrochlorination step, involving dehydrochlorinating 3-chloro-1,1,1,2-tetrafluoropropane under the catalytic action of activated carbon to obtain 2,3,3,3-tetrafluoropropene. The present inve