Thermal decomposition of vinylacetylene in shock waves

✍ Scribed by Yoshiaki Hidaka; Hiromitsu Masaoka; Hidekazu Oshita; Takuji Nakamura; Koji Tanaka; Hiroyuki Kawano

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 862 KB
• Volume: 24
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/kin.550241005

✦ Synopsis

The thermal decomposition of vinylacetylene ( C 4 H 4 ) was studied behind reflected shock waves using both a single-pulse method (reaction time between 0.8 and 3.3 ms) and a timeresolved UV-absorption method (230 nm). The studies were done over the temperature range of 1170-1690 K at the total pressure range of 1.3-2.3 atm. The mechanism was used to interpret both the early and late stages of vinylacetylene decomposition at the high temperatures. It was confirmed that C 4 H 4 dissociation proceeded through the following three channels.

C4H4 -

The rate constant expression of reaction (1) was determined as kl = 6.3 X loL3 exp(F87.1 kcal/ R T ) s..'. The rate constants of the succeeding reactions (chain reaction, C 4 H 4 + H + i-C4H3 + H 1 and C 4 H 4 + H -+ C 2 H 2 + C z H 3 and decomposition reactions of free radicals, i-C4H3 + M 4 C4H2 + H + M) were confirmed or estimated.