Thermal Product Distribution of Chlorinated Hydrocarbons with Pyrolytic Reaction Conditions

Two sets of thermal reaction experiment for chlorinated hydrocarbons were performed using an isothermal tubular-flow reactor in order to investigate thermal decomposition, including product distribution of chlorinated hydrocarbons. The effects of or Ar as the reaction atmosphere on the thermal decomposition and product distribution for dichloromethane() was examined. The experimental results showed that higher conversion of was obtained under atmosphere than under Ar atmosphere. This phenomenon indicates that reactive-gas reaction atmosphere was found to accelerate decomposition. The plays a key role in acceleration of decomposition and formation of dechlorinated light hydrocarbons, while reducing PAH and soot formation through hydrodechlorination process. It was also observed that and HCl in reaction system were the major products with some minor products including chloroethylenes. The /Ar reaction system gives poor carbon material balance above reaction temperature of . Chloroethylenes and soot were found to be the major products and small amounts of and were formed above in /Ar. The thermal decomposition reactions of chloroform() with argon reaction atmosphere in the absence or the presence of were carried out using the same tubular flow reactor. The slower decay occurred when was added to /Ar reaction system. This is because : diradicals that had been produced from unimolecular dissociation reacted with . It appears that the added worked as the : scavenger in the decomposition process. The product distributions for pyrolysis under argon bath gas were distinctly different for the two cases: one with and the other without . The important pyrolytic reaction pathways to describe the important features of reagent decay and intermediate product distributions, based upon thermochemistry and kinetic principles, were proposed in this study.