PROCESS FOR PREPARING 1,1,1,2-TETRAFLUOROETHANE AND 1,1,1-TRIFLUOROCHLOROETHANE Russian patent published in 1995 - IPC

FIELD: used as fluorocarbon solvents. SUBSTANCE: the product is 1,1,1,2- tetrafluoroethane and 1,1,1-trifluorochloroethane. Reagent 1: trichloroethylene. Reagent 2: hydrogen fluoride. Reaction conditions: catalytic gas phase reaction is carried out in two reaction zones, the synthesis gases of the first and second reaction zones being directed to the stage of evolution of hydrogen chloride and low-boiling organic products. High-boiling products (including hydrogen fluoride) are recycled to the first and second reaction zones wherein the molar ration of organic products and hydrogen fluoride is maintained at 1:2-30. The temperature in the first reaction zone varies from 180 to 420 C, and in the second reaction zone, from 350 to 450 C. The starting products (hydrogen fluoride and trichloroethylene) are fed to the first reaction zone. EFFECT: more efficient preparation process. 2 dwg, 8 tbl