Process for the preparation of 1,1-dichloro-1-fluoroethane

Details Process for the preparation of 1,1-dichloro-1-fluoroethane Process for the preparation of 1,1-dichloro-1-fluoroethane

C - Chemistry, Metallurgy

07

C

260/658.2

C07C 17/08 (2006.01) C07C 17/087 (2006.01) C07C 19/08 (2006.01)

Patent

CA 2004831

PROCESS FOR THE PREPARATION OF 1,1-DICHLORO-1-FLUOROETHANE ABSTRACT OF THE DISCLOSURE The present invention provides a process for the preparation of 1,1-dichloro-1-fluoroethane (known in the art as HCFC-141b). The procass comprises the step of: reacting anhydrous hydrogen fluoride and vinylidene chloride by using excess anhydrous hydrogen fluoride in the presence of a catalytic amount of a catalyst of the formula RmAClnFp wherein A is titanium, zirconium, or hafnium: R is an alkyl, alkenyl, or aryl group; m is 0 to 2: n is 0 to 4; and p is 0 to 4 with the proviso that at least one of n and p is not zero and m+n+p satisfies the valence of A, for a time and at a temperature sufficient to form 1,1-dichloro-1-fluoroethane. The 1,1-dichloro-1-fluoroethane produced by the present process is useful as a blowing agent for the production of rigid urethane thermoinsulation foam.

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