年产60万t对二甲苯项目中苯/甲苯/混合二甲苯分离的Aspen Plus模拟研究

Simulation for Separating Benzene / Methylbenzene / Xylene in the Project of Annual Production Capacity of 600,000 tons of Paraxylene

采用Aspen Plus软件对年产60万t的对二甲苯项目中的苯、甲苯和混合二甲苯物系在分隔壁精馏塔中的分离进行模拟计算,通过对分隔壁精馏塔进料板的位置、回流比、侧线采出位置等参数的优化,以求达到经济效益最好、节能效果最佳为目的。将优化后的分隔壁精馏塔与传统的普通双塔精馏在分离效果、能耗方面进行比较,结果表明分隔壁精馏塔分离效果较好、能耗较低,热负荷比常规精馏塔降低了24.05%。

The research is about separating benzene / methylbenzene / xylene with dividing wall column in the project of annual production capacity of 600,000 tons of paraxylene by using Aspen Plus software for simulation. In order to achieve the best economic benefits and energy saving,we have optimized parameters of the feed position and reflux ratio,side- draw position and others,compared DWC with common distillation in separation efficiency and energy consumption. The result showed that the DWC distillation was excellent in the separation efficiency and the energy consumption,thermal load are lower than common distillation columns 24. 05%,and the reason of less energy was analyzed.