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Kinetic stability of 1,1,1-Trifluoroethane

โœ Scribed by Wing Tsang; Assa Lifshitz

Book ID
101250946
Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
166 KB
Volume
30
Category
Article
ISSN
0538-8066

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โœฆ Synopsis

1,1,1-Trifluoroethane has been decomposed in comparative rate single-pulse shock-tube experiments. The rate expression for elimination at ca. 2.5 bar and in the temperature range of 1050 to has been found to be 1200 K

The experimental conditions appear to be such that the unimolecular reaction is at the beginning of the fall-off region and we find that for step sizes down between 500 and the high-pressure rate expression is in the range ฯช1 1000 cm k(CF 9CH !: HF ฯฉ CF ฯญ CH ) 3 3 2 2 15 15 ฯช1 ฯญ 2.0 ฯซ 10 exp(ฯช38300/T) to 4 ฯซ 10 exp(ฯช39000/T)s

where the smaller rate parameters refer to the larger step size down. The results are compared with those from an earlier study and the anomalously high A-factor is noted. It is suggested that the existing rate expressions for the fluorinated ethanes may need to be reevaluated.

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