分壁精馏塔分离苯/甲苯/二甲苯的模拟工艺研究

分壁精馏塔（简称分壁塔）在节能和节约投资方面都有很大的优势和潜力,因此近几年来人们对它的深入研究也越来越多。以等比例的苯、甲苯和二甲苯为原料,通过模拟工艺流程,研究分析了分壁塔的进料位置、隔板位置、回流比、侧线采出位置以及液汽相分流比与能耗、组分纯度的关系。研究结论显示,分壁塔的最适宜液相分流比和汽相分流比分别为0.65和0.45,与常规精馏塔相比,分壁塔分离所得的苯、甲苯和二甲苯的纯度高,冷凝负荷和热负荷分别比常规精馏塔降低31.066 9%和34.167 5%。

Simulation of Separating Benzene/Toluene/Xylene with Dividing Wall Column

Dividing wall column has a lot of advantages and potential in energy saving and investment saving,there are more and more researches on dividing wall column in recent years.With equal proportion of benzene,toluene and xylene as raw materials and process simulation,the relationships between feed stage,wall position,reflux ratio,side-draw position split ratios of liquid and vapor,and energy consumption,components’ purity were analyzed.Results show that,the best liquid split ratio and the best vapor split ratio are 0.65 and 0.45 respectively.Compared with conventional distillation towers,benzene,toluene and xylene obtained from dividing wall column are more purer,and the condenser duty and reboiler duty of dividing wall column are reduced by 31.066 9% and 34.167 5%,respectively.