Method for preparing 1,1-dichloro-1-fluoroethane

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

1994-08-08

1995-09-12

Siegel, Alan

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

Organic compounds

Halogen containing

570166, C07C 1708

Patent

active

054498430

ABSTRACT:
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 a sulfone solvent or a nitroalkane or nitroarene solvent. In particular, by using a titanium tetrafluoride catalyst in conjunction with tetramethylene sulfone solvent, most all the vinylidene chloride reagent 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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