Pyrolysis of 1-chloro-1,1-difluoroethane in the absence and in the presence of CCl4 and mixtures of CCl4 + HCl

The thermal dehydrochlorination CF₂ClCH₃ → CF₂ ? CH₂ + HCl has been studied in a static system between 637 and 758 K. It is a homogeneous, molecular first-order reaction and its rate constant is given by This reaction has also been studied in the presence of CCl₄ and mixtures of CCl₄ and HCl between 585 and 662 K. It is then accelerated and the initial rate increase is given by with log₁₀ (k′, L^½ /mol^½ · s) = ?(41,650 ± 180)/4.576T + (10.84 ± 0.06) and log₁₀ k″ = (7900 ± 180)/4.576T ? (0.59 ± 0.06). A radical chain mechanism is shown to be consistent with these latter results.