β沸石催化剂上苯/乙烯烷基化反应器模拟

Reactor Simulation for Alkylation of Ethylene with Benzene over β Zeolite

建立了苯与乙烯在β沸石催化剂上烷基化反应的气－液－固三相反应器数学模型，并应用变步长的Ｒｕｎｇｅ－Ｋｕｔａ法给出了模型的解。比较了不同的反应条件和反应器行为。计算结果表明，无论是固定床鼓泡反应器，还是滴流床反应器，反应过程均为气液膜液侧的传质阻力所控制，且固定床鼓泡反应器对该反应更适合。

With the obtained kinetic models,the alkylation reactors of benzene with ethylene over β zeolite have been simulated.A triphase reactor model was proposed and then its resolution was obtained by means of Runge-Kutta method.The simulated results show that the resistance of mass transfer from gas phase to liquid bulk is the largest and fixed bubble reactor is more suitable for the reaction.The simulation also offers the profiles of the component concentration and temperature in reactor.The appropriate operating conditions of fixed bubble reactor are:inlet temperature 130～150 ℃,pressure 0 9～1 2 MPa,molar ratio of benzene to ethylene 6/1～8/1,outlet temperature 180～210 ℃ and pressure 0 6～0 9 MPa.Under these conditions ethylene conversion of 99 5% and ethylbenzene selectivity of 93.0% can be achieved.