Purification of 1,1-dichloro-1-fluoroethane

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

C - Chemistry, Metallurgy

07

C

260/658.1

C07C 17/38 (2006.01) C07C 17/389 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2031983

ABSTRACT PURIFICATION OF 1,1-DICHLORO-1 FLUOROETHANE The present invention provides a process for the purification of 1,1-dichloro-1-fluoroethane comprising the steps of: (a) reacting anhydcous hydrogen fluoride with 1,1,1-trichloroethane or vinylidene chloride containing dichloroacetylene to form 1,1-dichloco-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. 6533k

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