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Pyrolysis of acetylene-vinylacetylene mixtures between 400 and 500°C

✍ Scribed by Chellappah Chanmugathas; Julian Heicklen

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
559 KB
Volume
18
Category
Article
ISSN
0538-8066

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✦ Synopsis

Acetylene and vinylacetylene mixtures were pyrolyzed at 400-500°C in the absence and presence of O2 or NO. The major product of the interaction between CzH2 and C4H4 is polymer, but benzene is also produced. Both the C2H2 removal and CsHs formation rates are first-order in C2Hz and C4H4. The rate coefficients are log(k{CzHZ}, M-' s -~) = 6.26 2 0.20 -(70.6 2 3.6)/2.3RT log(k{C,jH,j}, M-' s-') = 8.65 * 0.39 -(125.9 2 5.4)/2.3RT where R is the ideal gas constant in kJ/mol-K. Benzene formation occurs by two processes: a concerted molecular mechanism (=60%) and a singlet diradical mechanism (=40%).

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