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Pyrolysis of 1,2‐dichloropropane
Author(s) -
Martens G. J.,
Godfroid M.,
Ramoisy L.
Publication year - 1970
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550020206
Subject(s) - chemistry , pyrolysis , reaction rate constant , substituent , thermal decomposition , activation energy , atmospheric temperature range , decomposition , atmospheric pressure , order of reaction , organic chemistry , thermodynamics , kinetics , physics , oceanography , quantum mechanics , geology
The thermal decomposition of 1,2‐dichloropropane at atmospheric pressure has been studied in the temperature range 227–590°C, in a flow system. Above 450°C, the reaction is homogenous and unimolecular with a rate constant:\documentclass{article}\pagestyle{empty}\begin{document}$$k = 10^{12.95 \pm 0.15} \exp (- 53,070 \pm 500/RT)\sec ^{ - 1}$$\end{document}Below 450°C, a low activation energy, probably heterogenous process competes with the gas phase reaction The primary reaction products are HCl and the monochloropropene isomers; the relative amounts of each isomer depend on the temperature in the low but not in the high temperature region. The direction of the HCl elimination is discussed in terms of substituent effects at the α‐ and β‐carbon positions and compared with literature data on similar reactions Secondary products are formed principally by further pyrolysis of allyl chloride. The first‐order rate constant of this reaction is given by:\documentclass{article}\pagestyle{empty}\begin{document}$$ k = 10^{8.54 \pm 0.2} \exp (- 37,275 \pm 700/RT)\sec ^{ - 1} $$\end{document} .