Patent ID: 8207384
Filing Date: 2012-06-26
Classification: B01J,C07C,Y02P

Abstract:
1. A process for preparing 2,3,3,3-tetrafluoropropene (1234yf), comprising: (i) contacting 2,3-dichloro-1,1,1-trifluoropropane (243 db) with hydrogen fluoride HF in the gas phase in the presence of a fluorination catalyst under conditions sufficient to produce a reaction mixture; (ii) separating the reaction mixture into a first stream comprising HCl and 2,3,3,3-tetrafluoropropene (1234yf), and a second stream comprising HF, 2-chloro-3,3,3-trifluoro-1-propene (1233xf), and 1,1,1,2,2-pentafluoropropane (245cb); and (iii) recycling at least a part of the second stream comprising HF 2-chloro-3,3,3,-trifluoro-1-propene (1233xf) and 1,1,1,2,2-pentafluoropropane (245cb) back to step (i),