Patent ID: 6348634
Filing Date: 2002-02-19
Classification: B01J,C07C

Abstract:
A reductive dimerization process of 1,1,1-trifluoro, 2,2,2-trichloroethane (CFC-113a) with hydrogen with formation of 1,1,1,4,4,4-hexafluoro-2,2,3,3-tetrachloro-butane and 1,1,1,4,4,4-hexafluoro-2,3-dichlorobutene, and mixtures thereof, wherein the catalyst is formed of metal ruthenium supported on one of the following materials:a) graphitized carbon obtainable by treatment of the carbon at temperatures higher than 2000Â° C., in inert gas, having surface area in the range 350-100 m2/g BET, or b) aluminum fluoride having a high surface area, not lower than 25 m2/g, and a pore volume not lower than 0.20 cc/g, prepared by fluorination with gaseous HF of an alumina containing from 0.5 to 15% by weight of silicon oxide, and having a surface area of at least 150 m2/g with pore volume not lower than 0.3 cc/g.