分隔壁共沸精馏塔分离叔丁醇水混合物的模拟研究

提出了一种单塔共沸精馏分离叔丁醇水混合物的新工艺,新工艺采用分隔壁共沸精馏塔(DWC-A)替代常规共沸精馏流程的共沸精馏塔及回收塔,不仅节省了设备投资,而且降低了总能耗。利用ASPENPLUS模拟软件,对分隔壁共沸精馏塔及常规萃取流程进行了模拟。分隔壁共沸精馏塔的操作条件为:主塔理论板数为25块,副塔理论板数为10块,环已烷为共沸剂,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,分隔壁共沸精馏塔比常规的两塔萃取精馏流程节能17.8%。

Simulation of dividing-wall azeotropic distillation column for separation of tert-butanol from water

A novel single column azeotropic distillation process was proposed for separating tert-butanol from tert-butanol/water mixture,in which the dividing-wall azeotropic distillation column was used to instead of the conventional azeotropic distillation column and recovery column,that could result in equipment investment reducing and energy saving.The dividing-wall azeotropic distillation column and the conventional azeotropic distillation process were simulated by the AspenPlus software.The operation parameters for the dividing-wall azeotropic distillation column were proposed as follows:main column theoretical stages of 25,auxiliary column theoretical stages of 10,and cyclohexane as entrainer.Temperature,composition and flow rate profiles in the dividing-wall azeotropic distillation column and the conventional azeotropic distillation process were compared.The results showed that the dividing-wall azeotropic distillation column could reduce energy consumption by 17.8% compared with the conventional azeotropic distillation process.