Patent ID: 8552228

Claim:
A process for the preparation of 2,3,3,3-tetrafluoropropene (1234yf) comprising: (a) contacting in the vapor phase at a temperature of from 100 to 400° C. and at super-atmospheric pressure up to 30 bara.1,1,1-trifluoro-2,3-dichloropropane (243db) with hydrogen fluoride (HF) in the presence of a zinc/chromia catalyst containing from 0.01 to about 25% by weight of zinc or a compound of zinc to produce a compound having the formula CF 3 CHFCH 2 X, wherein X is Cl or F; and (b) dehydrohalogenating the compound of formula CF 3 CHFCH 2 X to produce 1234yf, said dehydrohalogenating being (i) induced thermally, (ii) base-mediated, or (iii) catalyzed by a catalyst selected form a carbon-based catalyst, a catalyst comprising a main group metal, or a catalyst comprising a transition metal.