Kinetics and adiabatic fixed-bed simulation of catalytic oxidation of 1,2-dichloroethane

The catalytic oxidation of 1,2-dichloroethane (DCE) was investigated with metal oxide modified zeolite catalysts developed in our laboratory. Kinetics and industrial scale adiabatic single-bed or multi-fixed-bed reactor simulations were studied. Catalytic oxidation reaction data of DCE were collected in a three-stage fixed-bed reactor at 320~420 ℃ and 0~1 244.44 g∙h∙mol-1 feed mass space-time. By analysing the reaction steps of DCE catalytic oxidation and reaction product compositions, a complex reaction network was proposed in which DCE and two relatively large amounts of vinyl chloride (VC) and tetrachloroethylene (PCE) were treated as the key components and trace amounts of other chloroolefins in the products were neglected. The reaction kinetic model was established. The experimental data were fitted by a non-linear least squares method using Matlab, and the kinetic parameters of each reaction were obtained. The quasi-homogeneous one-dimensional model was used to simulate the conversion distribution and the axial temperature distribution using indirect heat transfer and quenched heat transfer under different gas feed flow rates and DCE feed concentrations. The results show that the fitting results are in good agreement with the kinetic experimental data, and the established kinetic model is suitable for the catalytic oxidation of DCE. This study has great potential for industrial scale reactor design for catalytic oxidation of DCE waste gas, and also provides reference for heat transfer mode selection in waste gas treatment. © 2020, Editorial Board of Journal of Chemical Engineering of Chinese Universities". All right reserved."