对二甲苯氧化反应器连续全混流模型

在对二甲苯液相催化氧化动力学研究的基础上,比较了化学反应速率与气液传质速率的相对大小。结果表明,工业反应器中,该氧化过程受化学反应控制,动力学是影响反应速率的主要因素。从而不计传质,并将反应器考虑成CSTR模型,模拟计算结果与实际值比较吻合。用此模型对影响反应的各工艺条件的计算机试验表明,停留时间延长、催化剂浓度增加、温度升高、Br/Co(摩尔比)比增大有利于提高TA收率和降低4-CBA浓度,但燃烧消耗加剧;Co/Mn(摩尔比)配比对主反应影响不大,但燃烧副反应随Co/Mn配比增大而增大。

Cstr Model for p-Xylene Oxidation Reactor

Rates of chemical reaction and mass transfer were compared to determine the control step of p-xylene liquid phase oxidation process based on the kinetics previously obtained. It was shown that the p-xylene oxidation is controlled by chemical reaction under the industrial oxidation conditions. Therefore, the effect of mass transfer can be ignored and the CSTR model was used to simulate the reactor. The computation results showed that the yield of terephthalic acid increases and the concentration of 4-CBA decreases when the resident time, catalyst concentration, temperature, and/or the mol ratio of Br/Co increases, but the combustion rate of p-xylene and acetic acid increase simultaneously. It was also found that increasing the mol ratio of Co/Mn accelerates the side combustion reactions more remarkably than the main reactions.