Electron beam treatment of chloroethylenes/air mixture in a flow reactor

Computational study on the mechanisms and kinetics of the CH2CCl + O2 reaction

The potential energy surface for the CH2CCl + O2 reaction has been investigated by using the CCSD(T)/cc-pVTZ//B3LYP/6-311++G(d,p) method. Two type reaction mechanisms have been located. The H-abstraction of CH2CCl by O2 generates CHCCl + HO2 surmounting a 20.86 kcal/mol barrier. The addition between O2 and CH2CCl proceeds to an intermediate CH2CClO2 (IM1t and IM1c) without a barrier, which can further dissociate or isomerize to various products with the complicated processes. The temperature and pressure dependence rate constants for the CH2CCl + O2 reaction were computed by means of multi-channel RRKM-TST theory. Moreover, TDDFT calculations imply that IM1t, IM1c, IM2, IM4, IM5t, and IM5c will photolyze under the sunlight.

Destruction of 1,1-dichloroethylene/air mixture under gamma-ray irradiation

Radiation-induced decomposition of 1,1-dichloroethylene(1,1-DCE)) in air was investigated in the experiment. The model gas prepared by mixing 1,1-dichloroethylene vapor with air was sealed in batch reactors and subjected to gamma irradiation. Inorganic products (CO+CO2) and organic products were analyzed by means of a TOC analyzer and gas-chromatography, respectively. It was found that chloroacetyl chloride (CH2ClCOCl) was present as the main organic product while inorganic products (CO+CO2) occurred in quantities below 10 based on relative carbon balance. Energy consumption of 1,1-DCE by using gamma-ray irradiation was compared with that by using electron beam irradiation.