Kinetics of the thermal decomposition of CF3CHCL2 in a single-pulse shock tube

The pyrolysis of 2,2-dichloro-1,1,1-trifluoroethane was studied over the temperature range of 1120–1260°K at total reflected shock pressures from ～2800 to 3100 torr. Below 1260°K, the decomposition leads to three reaction products which were identified as CF₂CFCl, CF₂CFH, and CF₃CCl₃. The results are interpreted in terms of a parallel C? Cl bond rupture process which becomes competitive with the molecular HCI elimination. The rate constant for the α,α-elimination process has been deduced to be It was also possible to obtain the overall rate constant for the formation of CF₂CFH, which is given by Some evidence for hydrogen fluoride elimination was found at temperatures above 1260°K. However, at these higher temperatures C? C bond scission also occurs and the kinetics of the system become untractable.