甲苯甲醇烷基化模拟优化

Toluene alkylation with methanol simulation optimization

面对国内对二甲苯生产人文环境持续恶化,但市场需求量不断上升。故以清洁、绿色的工艺扩大对二甲苯产能是市场导向的结果。本文基于反应动力学方程,建立Aspen Plus流程,从敏感性分析得出最佳反应温度为460℃、压力为0.5 MPa。以部分反应物甲醇作为冷激进入第二个及以后串联的反应器,有利于提高甲苯转化率,对二甲苯选择性;经对比分析,4个反应器串联在理论上可实现经济最优。最后,运用夹点技术对换热网络进行设计优化,实现热公用工程节约34.04%,冷公用工程节约32.27%。本文为甲苯甲醇烷基化工艺实现工业化提供数据支撑,从而缓解我国的对二甲苯供不应求大量依赖进口的现状。

While facing the domestic p-xylene production humanities environment continued to deteriorate, the market demand is rising. So the green technology must be sought to expand on the xylene capacity. Establishment Aspen Plus based on reaction kinetics equation to improve the toluene conversion, the p-xylene selectivity and economic benefits, with in part of reactants methanol being cold shock into the second and subsequent series reactor. From the sensitivity analysis it is concluded that the best reaction temperature is 460~C and pressure is 0.5 MPa. In theory, four reactors in series, which can realize economic optimum. By using pinch technology heat exchange network design optimization, implementation hot utilities saving 34.04%, cold utilities to save 32.27%. This article mainly p-toluene methanol alkylation process achieve industrialization to provide data support, which can ease the p-xylene demand present situation of china.