Decontamination of 2-Chloroethyl Ethyl Sulfide by Pulsed Corona Plasma

摘要

Decontamination of 2-chloroethyl ethyl sulfide (2-CEES,CH3CH2SCH2CH2Cl) by pulsed corona plasma was investigated.The results show that 212.6 mg/m3 of 2-CEES,with the gas flow rate of 2 m3/h,can be decontaminated to 0.09 mg/m3.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 CH3CH2S· and ·CH2CH2Cl radicals.CH3CH2S· can be decomposed to ·C2H5 and ·S.·S can be oxidized to SO2,while ·C2H5 can be finally oxidized to CO2 and H2O.The C-Cl bond in the ·CH2CH2Cl radical can be destroyed to form ·CH2CH2·and ·Cl,which can be mineralized to CO2,H2O and HCl.The H atom in the ·CH2CH2Cl radical can also be substituted by ·Cl to form CHCl2-CHCl2.