Kinetics of the thermal decomposition of CF 3 CHCL 2 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 CF 2 CFCl, CF 2 CFH, and CF 3 CCl 3 . 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 CF 2 CFH, 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.