Hydrogen fluoride, from pyrolysis

Vinylidene fluoride, CH2=CF2, is obtained by the pyrolysis of 1,1-difluoro- 1-chloroethane, which in turn is produced from acetylene, vinylidene chloride, or 1,1,1-trichloroethane by reaction with hydrogen fluoride. Because of its low boiling temperature, —84°C, vinylidene fluoride is suspension or emulsion polymerized under pressure. Considerable head-head linkage quantities are produced in these polymerizations. 

CH3F (trace). Pyrolysis of sodium trifluoroacetate alone yields trifluoro-acetyl fluoride and trifluoroacetic anhydride pyrolysis of sodium trifluoroacetate in the presence of sodium hydroxide, however, does appear to give difluorocarbene since tetrafluoroethylene is produced in at least 32% yield. Data from kinetic studies on hydrogen atom abstraction by Me and CFa (generated by photolysis of acetone and hexafluoroacetone, respectively) from methyl trifluoroacetate and methyl fluoroformate have been presented and discussed. ... 

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