Process for preparing 1,1,1-trifluoro-2-chloroethane
AssigneeAusimont S.p.A.
InventorPaolo Cuzzato
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Abstract
In the preparation of 1,1,1-trifluoro-2-chloroethane (HCFC 133a) by means of hydrofluorination in the gas phase of trichloroethylene (TCE) in the presence of a carried catalyst based on Cr2O3 it is possible to prolong the catalyst life by feeding to the hydrofluorination reactor, along with trichloroethylene, little amounts (7-25 mols % calculated on the mixture with trichloroethylene) of 133a.
Claims2
A process for the preparation of 1,1,1-trifluoro-2-chloroethane by reacting, in the gas phase, a mixture consisting of 1,1,1-trifluoro-2-chloroethane and trichloroethylene in a molar ratio from 7:93 to 25:75 with hydrogen fluoride in the presence of a catalyst consisting of chromium trioxide carried on aluminum trifluoride at a temperature from 280 degrees celsius to 300 degrees celsius.
Dependencies are inferred from the claim text.