苯与丙烯烷基化的加压反应与常压精馏集成过程模拟研究

Simulation of process integrated atmospheric distillation with pressure reaction for alkylation of benzene and propylene

针对苯与丙烯烷基化生产异丙苯先反应后分离的传统工艺中苯烯比高、能耗大的问题,本文提出了加压反应与常压精馏集成新工艺,采用Aspen Plus对该过程进行稳态模拟。在苯与丙烯摩尔比为1的进料情况下,研究了侧反应器台数、侧反应器间间隔塔板数、丙烯分配比例、提馏段塔板数和再沸比等参数对此反应精馏过程的影响规律。在侧反应器3台、反应器间隔塔板数2块、丙烯分配比(0.84/0.14/0.02)、提馏段塔板数5块、再沸比为8时,苯转化率达到99%,异丙苯选择性达到98%。与传统工艺相比,加压反应与常压精馏集成新工艺的反应器总体积减小34.4%,精馏塔再沸器热负荷减少63.8%,节能效果显著。

In order to decline the ratio of benzene to propylene and energy consumption during the production of cumene by alkylation of benzene, a novel reactive distillation process integrated pressure reaction and atmospheric distillation was proposed, and the steady-state process simulation was carried out using Aspen Plus. With the molar ratio of benzene to propylene as 1, the influences of side reactor number, interval stage number between adjacent side reactors, distribution of propylene, stage number of stripping section and reboil ratio on the performance of the reactive distillation process were investigated. The simulation results indicated that the optimal parameters were as follows, 3 side reactors, 2 interval stage number between adjacent side reactors, distribution of propylene as 0.84/0.14/0.02, 5 stage number of stripping section and reboil ratio as 8. Under the optimum conditions, the conversion of benzene reached 99 %, and the selectivity of cumene was up to 98 %. Simulation results show that compared with the traditional process, reactor volume of reactive distillation process integrated pressure reaction and atmospheric distillation reduced 34.4 %, reboiler heat duty of distillation reduced 63.8 %, which has remarkable energy-saving effect.