Thermal reactions of acetonitrile at high temperatures. Pyrolysis behind reflected shocks

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Abstract
The thermal decomposition of acetonitrile was studied behind reflected shocks in a single pulse shock tube over the temperature range 1350–1950 K at overall densities of approximately 3 × 10−5 mol/cc. Methane and hydrogen cyanide are the major reaction products. They are formed by an attack of H and CH3 radicals on acetonitrile. The initiation step of the pyrolysis is the self dissociation of acetonitrile: magnified image for which the following rate constant was obtained: k1 = 6.17 × 1015exp(−96.6 × 103/RT)sec−1. Where R is given in units of cal/K mol. Additional reaction products which appear in the pyrolysis are: C2H2, C2H4, CH2CHCN, CHCHCN, C2H5CN, C2N2, and C4H2. Acetylene is formed from methane pyrolysis and becomes a major reaction product at high temperatures. Acrilonitrile and cyanoacetylene are secondary products originating from the CH2CN radical. Rate parameters for the formation of the reaction products are given.

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