Patent ID: 8445736
Filing Date: 2013-05-21
Classification: C07C

Abstract:
1. A process for preparing 1,1,1,2-tetrafluoropropene, comprising contacting, 1,1,2,3-tetrachloropropene with hydrogen fluoride in gas phase in the presence of a chromium fluorination catalyst, and an oxygen containing oxidizing agent, under conditions sufficient to directly produce, in a single reaction step, a reaction mixture comprising 1,1,1,2-tetrafluoropropene and at least one compound of formula CF removing HCl from said reaction mixture; separating 1,1,1,2-tetrafluoropropene from said reaction mixture; and recycling to the reactor hydrogen fluoride, at least one compound of formula CF wherein said fluorination catalyst is activated with hydrogen fluoride at a pressure above about 150 psi.