Method of preparing 1,1-difluoroethane

Details Method of preparing 1,1-difluoroethane Method of preparing 1,1-difluoroethane

1976-10-20

1979-02-06

Vertiz, O. R.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 1708

Patent

active

041384393

ABSTRACT:
A process for preparing 1,1-difluoroethane by contacting acetylene with hydrogen fluoride in the presence of an aluminum fluoride containing catalyst, the hydrofluorination being carried out at a temperature between 150 and 350.degree. C. employing a residence time of one to 60 seconds. The catalyst employed is one prepared by imbibing gamma or eta aluminum oxide with a solution of a bismuth salt and a manganese salt. The so-imbibed catalyst is heated at a temperature between 150 and 250.degree. C. initially in a nitrogen atmosphere and then, after complete drying, in a mixture of air employing increasing concentrations of hydrogen fluoride up to 100 percent hydrogen fluoride atmosphere. The finished catalyst contains:

REFERENCES:
patent: 2471525 (1949-05-01), Hillyer et al.
patent: 3395187 (1968-07-01), Christoph
patent: 3591646 (1971-07-01), Vecchio et al.
patent: 3720722 (1973-03-01), Wada et al.
patent: 3810948 (1974-05-01), Meussdoerffer
patent: 3904701 (1975-09-01), Schultz et al.

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