Method of preparing 1,1-dichloro-1-fluoroethane

Details Method of preparing 1,1-dichloro-1-fluoroethane Method of preparing 1,1-dichloro-1-fluoroethane

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2129363

2129363 9413607 PCTABS00032 A more efficient reaction mechanism is provided for producing 1,1-dichloro-1-fluoroethane (HCFC-141b) by reacting vinylidene chloride with hydrogen fluoride in the liquid phase in the presence of a catalyst and sulfone based or nitrated solvent. In particular, by using a titanium tetrafluoride catalyst in conjunction with tetramethylene sulfone solvent, most all the vinylidene chloride reagents can be converted to HCFC-141b to the virtual exclusion of unwanted, closely associated byproducts like 1,1-difluoro-1-chloroethane (HCFC-142b) and 1,1,1-trifluoroethane (HFC-143a) while reducing the production of tars to a minimum.

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