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

✍ Scribed by M. V. C. Sekhar; G. E. Millward; E. Tschuikow-Roux

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
496 KB
Volume
5
Category
Article
ISSN
0538-8066

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✦ Synopsis

The pyrolysis of 2,2-dichloro-l , 1 ,I-trifluoroethane was studied over the temperature range of 112(tI26OoK 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&FCI, CF&FH, and CF3CC13. The results are interpreted in terms of a parallel C-C1 bond rupture process which becomes competitive with the molecular HCI elimination. 'The rate constant for the *,a-elimination process CF3CHC12 + CFzCFCl $-HC1 has been deduced to be log (klm/sec-') = (13.4 f 0.7) -(63.1 f 3.8 kca1)/2.303RT It was also possible to obtain the overall rate constant for the formation of CFZCFH, which is given by log (k"/sec-') = (1 1.5 f 0.8) -(54.1 i 4.5 kca1)/2.303RT 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.

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