Patent ID: 8293953
Filing Date: 2012-10-23
Classification: C07C

Abstract:
1. A method for producing 1,1-dichloro-2,3,3,3-tetrafluoropropene comprising contacting a mixture of dichloropentafluoropropane comprising 1,1-dichloro-2,2,3,3,3-pentafluoropropane with an aqueous alkali solution in the presence of a phase transfer catalyst, wherein said mixture of dichloropentafluoropropane is obtained by subjecting a starting material comprising one isomer or a mixture of at least two isomers of dichloropentafluoropropane and having a 1,1-dichloro-2,2,3,3,3-pentafluoropropane content of less than 60 mol %, to an isomerization reaction in the presence of a Lewis acid catalyst or a metal oxide catalyst so as to increase the 1,1-dichloro-2,2,3,3,3-pentafluoropropane content in the product to be higher than the content in the starting material.