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Pyrolysis of Propyne/2-Methylbut-1-ene-3-yne mixtures between 350 and 450°C

✍ Scribed by Charles Harper; Julian Heicklen

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
626 KB
Volume
21
Category
Article
ISSN
0538-8066

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✦ Synopsis

2-Methylbut-1-ene-3-yne and Propyne mixtures were pyrolyzed at 350-450°C in the absence and presence of O2 and NO. The major product of the reaction is a polymer, but rn-xylene andp-xylene are also produced and were studied as the species of interest. The CsHIo formation rate is first-order in C3H4 and C5H,. The rate coefficient is best fitted by lOg[k(CBHIo),M~'s~'] = (11.2 2 1.0) -(166 ? 13)/2.3RT though it is not inconsistent with log[k(CgH,,), W ' S -' ] = (8.17) -(125.9)/2.3RT

where R is the ideal gas constant in kJ/mol-K. Experiments in the presence of NO show that m-xylene and p-xylene formation occur by two processes: a concerted molecular mechanism (= 41%) and a singlet diradical mechanism (= 59%).

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