Decontamination of 2-Chloroethyl Ethyl Sulfide by Pulsed Corona Plasma

Decontamination of 2-chloroethyl ethyl sulfide(2-CEES,CH_3CH_2SCH_2CH_2Cl) by pulsed corona plasma was investigated.The results show that 212.6 mg/m~3 of 2-CEES,with the gas flow rate of 2 m~3/h,can be decontaminated to 0.09 mg/m~3.According to the variation of the inlet and outlet concentration of 2-CEES vapor with retention time,it is found that the reaction of 2-CEES in a pulsed corona plasma system follows the first order reaction,with the reaction rate constant of 0.463 s~(-1).The decontamination mechanism is discussed based on an analysis of the dissociation energy of chemical bonds and decontamination products.The C-S bond adjacent to the Cl atom will be destroyed firstly to form CH_3CH_2S· and CH_2CH_2Cl radicals.CH_3CH_2S· can be decomposed to ·C_2H_5 and ·S.·S can be oxidized to SO_2,while ·C_2H_5 can be finally oxidized to CO_2 and H_2O.The C-Cl bond in the ·CH_2CH_2Cl radical can be destroyed to form ·CH_2CH_2·and ·Cl,which can be mineralized to CO_2,H_2O and HCl.The H atom in the ·CH_2CH_2Cl radical can also be substituted by ·Cl to form CHCl_2-CHCl_2.