分隔壁萃取精馏塔分离醋酸水溶液的模拟

提出了一种新的单塔萃取精馏精制醋酸水溶液的新工艺,该工艺采用分隔壁萃取精馏塔(DWC-E)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Aspen Plus模拟软件,对DWC-E塔及常规萃取流程进行了模拟。DWC-E塔的操作条件:塔板数40块,侧线精馏段的板数10块,回流比2,溶剂摩尔比2.5,在此条件下,比较了常规萃取精馏流程与分隔壁精馏塔内温度、液相组成及汽液相流量的变化。结果表明,DWC-E塔比常规的2塔萃取精馏流程节能23.91%。

Simulation of dividing-wall extractive distillation column for separation of the acetic acid and water

A novel process of single-column extractive distillation process was proposed for the separation of the acetic acid and water,in which the dividing-wall extractive distillation column was used instead of the conventional extractive distillation column and striper column,thus not only reducing the cost of equipment but also saving the energy.The dividing-wall extractive distillation column and the conventional extractive distillation process were simulated with Aspen Plus.The parameters of dividing-wall extractive distillation column were proposed: the number of theoretical total plate was 40,the reflux ratio was 2,the molar ratio of extract solvent to feed was 2.5.Temperature,composition and flow rate profiles in dividing-wall extractive distillation column and conventional extractive distillation processes were compared.The results show that the energy consumption of dividing-wall extractive distillation column can be reduced by 23.91% compared with conventional extractive distillation process.