连续萃取精馏分离异丙醇-水的静态模拟分析

Static simulation analysis of separation of isopropanol-waterby continuous extractive distillation

一般方法难以分离异丙醇-水形成的共沸体系,故选用乙二醇为萃取剂,采取连续萃取精馏的方法应用Aspen Plus软件模拟其分离过程并进行分析。萃取精馏塔的初始参数为物料进料流率4800 kmol/h、n(异丙醇)∶n(水)=3∶2,理论塔板数26块、物料进料位置为第16块塔板、最小回流比1.4、萃取剂进料位置为第4块塔板,可分离得到质量分数为99.5%的异丙醇,再用Aspen Plus中Model Analysis Tools模块的灵敏度分析对实验进行模拟优化,优化结果为理论塔板数28块、物料进料位置第17块塔板、最小回流比1.5、萃取剂进料位置第4块塔板,优化后异丙醇的质量分数可达到99.8%。

It is difficult to separate the azeotropic system formed by isopropanol and water by general methods.Ethylene glycol was selected as the extraction agent,and the separation process was simulated and analyzed by Aspen Plus software.Initial parameters of extraction rectification tower:the material feeding flow rate is 4800 kmol/h,the molar ratio of isopropanol and water is 3∶2,the number of theoretical trays is 26,the feeding position of the material is the 16th tray,the minimum reflux ratio is 1.4,feeding position of the extraction agent is the 4th piece,and running test under above conditions can get isopropanol with purity 99.5%.Sensitivity analysis in Model Analysis Tools of Aspen Plus was used to simulation and optimization,the optimization results as follows:the number of theoretical trays is 28,the feeding position of the material is the 17th tray,the minimum reflux ratio is 1.5,and the feeding position of the extraction agent is the 4th tray.The purity of isopropanol after optimization can reach 99.8%.