Purification of 1,1-dichloro-1-fluoroethane

Details Purification of 1,1-dichloro-1-fluoroethane Purification of 1,1-dichloro-1-fluoroethane

1989-12-15

1990-08-21

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

570164, C07C 1738

Patent

active

049508164

ABSTRACT:
The present invention provides a process for the purification of 1,1-dichloro-1-fluoroethane comprising the steps of: (a) reacting anhydrous hydrogen fluoride with 1,1,1-trichloroethane or vinylidene chloride containing dichloroacetylene to form 1,1-dichloro-1-fluoroethane; and (b) passing the 1,1-dichloro-1-fluoroethane through activated carbon to substantially remove unsaturated impurities. In particular, the present process reduces the amounts of dichloroacetylene and vinylidene chloride in the 1,1-dichloro-1-fluoroethane product so as to meet the current specifications set forth by the Panel for Advancement of Fluorocarbon Test.
The purified 1,1-dichloro-1-fluoroethane product is useful as a blowing agent and a solvent.

REFERENCES:
patent: 3026359 (1962-03-01), Mastrangelo
patent: 3833676 (1974-09-01), Ukaji et al.
patent: 4849558 (1989-07-01), Goodman
A. L. Henne et al., J. Am. Chem. Soc. 65, 1271 (1943).

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