Study On MX Oxidation Reaction Kinetics And Process Simulation

As a highly promising intermediate raw material,isophthalic acid(IPA)is synthesized by high-purity m-xylene(MX)though air oxidation in liquid phase.This paper firstly studied the mechanism of the MX liquid-phase oxidation under the condition of Co-Mn-Br catalysts and established the main and side reaction kinetic models for MX liquid-phase oxidation.The experimental results of MX liquid-phase oxidation with different catalyst concentrations and water contents showed that the reaction rate constants of the main reaction kinetic model agreed well with the predicted value calculated by Hammett equation and the kinetic model has excellent prediction ability for experimental data.Secondly,the viscosity of the oxidation system was measured by experiments and the thermodynamic parameters of the reaction system were calculated.Based on the above mass transfer and thermodynamic parameters,the relationship between the reaction and mass transfer of the MX liquid-phase oxidation system was analyzed.Finally,based on the operating parameters of three different PX oxidation processes and the kinetic model in this paper,the MX liquid-phase oxidation unit was simulated and the calculated results were in good agreement with the industrial data.The research results in this paper can provide basic parameters and guidance for the design and optimization of MX oxidation process.