反应控制相转移催化液相丙烯环氧化工艺研究

Study on the Process of Epoxidation of Liquid Propylene by Reaction-Controlled Phase Transfer Catalyst

摘要: 在含有反应控制相转移催化剂及H2O2的均相有机体系中，以H2O2为氧源，研究反应控制相转移催化液体丙烯(PP)环氧化制备环氧丙烷(PO)的反应过程，考察了反应温度、反应时间、原料配比、H2O2浓度对反应的影响；并进行了反应条件下H2O2的稳定性考察及反应过程中催化剂相变规律的探讨，在此基础上初步进行反应动力学探索。结果表明：反应速率随温度的升高而增加，但综合考虑H2O2的分解因素，以60℃为最佳，反应时间控制在100 min左右为宜，最佳原料配比( (摩尔比))为3:1，催化剂的催化性能与其相变状况密切相关，催化剂加量为0.3%时，H2O2浓度以1.8~2.2 mmol/g为宜；根据反应平衡建立了反应动力学速率方程，并通过matlab编程，确定了丙烯环氧化反应的反应级数及速率常数。

Abstract: When using aqueous hydrogen peroxide as oxidant, the process of the reaction of the liquid pro-pylene epoxidation by reaction-controlled phase transfer catalyst was studied in the organic sol-vent including reaction-controlled phase transfer catalyst and H2O2; the effects of reaction tem-perature, the ratio of raw materials, reaction time and H2O2 concentration on the epoxidation were investigated. Under the reaction condition, the stability of H2O2 and the phase transforma-tion of the catalyst were also researched. On the basis, the reaction kinetics was explored preli-minarily. The results showed that the reaction rate increased with increasing temperature; the optimal reaction temperature was 60˚C considering the factor of H2O2 decomposition; the reaction time can be controlled at about 100 min; the mole rate of raw material ( (mole)) was 3:1; the catalytic activity was closely related to its phase transition; when the dosage of catalyst was 0.3%, the concentration of H2O2 in 1.8 - 2.2 mmol/g was appropriate. The reaction rate equation was established according to the reaction equilibrium. The order and the rate constant of reaction of epoxy propane were calculated using the MATLAB program.