Patent ID: 9567274
Date: 2017-02-14
CPC Classifications: B01J,C07C

Claim:
1. A process for producing 2-chloro-1,1,1,2-tetrafluoropropane comprising: (i) reacting 2-chloro-3,3,3-trifluoropropene with hydrogen fluoride in the presence of an ionic liquid based catalyst under conditions sufficient to form a reaction mixture comprising 2-chloro-1,1,1,2-tetrafluoropropane and HCl as a byproduct, wherein the catalys is obtained by reacting at least one halogenated or oxyhalogenated Lewis acid based on aluminum, titanium, niobium, tantalum, tin, antimony, nickel, zinc or iron with a salt of general formula Y+A−, in which A− denotes a halide anion or hexafluoroantimonate anion and Y+ a quaternary ammonium cation, quaternary phosphonium cation or ternary sulfonium cation; (ii) separating HCl and HF by a separation process from the reaction mixture to form an organic mixture; (iii) separating said organic mixture into a first stream comprising 2-chloro-1,1,1,2-tetrafluoropropane, and a second stream comprising unreacted 2-chloro-3,3,3-trifluoropropene; and (iv) recycling the unreacted 2-chloro-3,3,3-trifluoropropene to step (i).