| The pyrolysis behavior of cyclohexane and cyclohexane/benzene mixtures diluted in argon was investigated using a chemical shock tube. The temperature range of 1000 to 1600 K was studied with reaction times varying from 0.5 to 2.0 milliseconds. Concentrations ranged from 0.75 to 1.5 ;Liquid and solid residue recovered consisted of phenyl substituted compounds, with cyclohexylbenzene, biphenyl, and C;Pyrolysis of cyclohexane/benzene mixtures resulted in the same product distribution as that of cyclohexane. The influence of the aromatic was seen in the shifting of the maximum yields of 1,3 butadiene and cyclohexene to lower temperatures. Additionally, unsaturated compounds appeared in the pyrolysate at lower temperatures. Liquid and solid residue recovered included styrene, C;A chemical mechanism to describe the decomposition of cyclohexane was proposed. A computer code was written to simulate the mechanism and executed using reaction temperatures and times. The computer model predicted the decomposition behavior well over the intermediate temperature range, but under predicted decomposition at low temperatures.;Principle products of cyclohexane decomposition were ethylene, 1,3 butadiene, and cyclohexene. Yields of cyclohexene and 1,3 butadiene reached maximum values before declining with increasing temperature. Methane, acetylene, diacetylene, vinyl acetylene, and benzene appeared in the pyrolysate as cyclohexene and 1,3 butadiene yields decreased. Propylene, cyclohexadiene, diacetylene, and vinyl acetylene yields reached maximum values before decreasing as temperature increased.;Decomposition is initiated by cleavage of the C-C bond to form the hexenyl diradical. |
