进气氧浓度对PX氧化反应器的影响

以对二甲苯（PX）液相催化氧化反应器的连续鼓泡釜模型，对尾氧浓度保持3．5％时不同进气氧浓度下的反应器进行了模拟。模拟计算发现反应温度随着进气氧浓度的增加而升高，可以通过减少塔顶抽出水量或降低反应压力维持反应釜温度不变。较高的氧浓度进气对反应器操作的影响主要表现在温度效应和浓度效应上，温度效应使得主反应的速率增加，浓度效应却降低主反应的速率。随着进气氧浓度的增加，温度效应和浓度效应共同作用的结果是氧化反应器的生产能力先增大后减小，因此存在一个适宜的进气氧浓度，由计算得到为26.6％。

Effect of Oxygen Volume Fraction in Feed Stream on p-Xylene Oxidation Reactor

A CSTR reactor model was developed to simulate p-xylene oxidation reactor at different volume fraction of oxygen in feed stream. Simulated results showed that reaction temperature increased simultaneously at a fixed oxygen volume fraction in vent, when volume fraction of oxygen in feed stream increased. The decrease of the amount of water taken out at the condenser or the decrease of thereactor pressure could keep reaction temperature constant. Oxygen volume fraction in feed stream influenced reactor operation by two effects. One was reaction temperature, which accelerated main reaction rate, and other was oxygen concentration in the liquid phase, which decelerated main reaction rate. As oxygen volume fraction in feed stream increased, the productivity of the reactor increased, and then decreased. Thus, there was a most appropriate volume fraction of oxygen in feed stream, 26.6%.