具有能量集成的萃取精馏新工艺及模拟

提出了一种新的单塔萃取精馏精制芳烃和非芳烃的新工艺,新工艺采用分隔壁萃取精馏塔替代常规萃取精馏流程的萃取精馏塔及溶剂回收塔,不仅节省了设备投资,而且降低了总能耗。利用ASPENPLUS模拟软件,对分隔壁萃取精馏塔及常规萃取流程进行了模拟,考察了溶剂比、回流比及分配比对分隔壁萃取精馏塔的影响,并对两种流程进行了比较,结果表明,分隔壁萃取精馏塔的最佳操作条件为:塔板数为41块,侧线精馏段的板数为10块,回流比为1,溶剂比为3.5,分配比为1.25。在此条件下,分隔壁萃取精馏塔比常规的两塔萃取精馏流程节能25.2%。

A Novel Extractive Distillation Process with Energy Integration and Its Simulation

A novel extractive distillation process was proposed for the separation of aromatics and paraffin.This process used divided-wall extractive distillation column to replace the conventional extractive distillation column and striper column,and therefore reduced the equipment cost and energy consumption.The divided-wall extractive distillation column and conventional extractive distillation process were simulated by Aspen Plus.The effects of operation parameters such as the ratio of extract solvent to feed,reflux ratio and distribution ratio on the separation process were analyzed.The optimum parameters for the divided-wall extractive distillation column were proposed as follows:the theoretical total plate number is 41,the ratio of extract solvent to feed is 3.5,the reflux ratio was 1 and the distribution ratio is 1.25.The divided-wall extractive distillation column could reduce 25.2% energy consumption compared with conventional extractive distillation process.