分壁式精馏塔分离醇类三元物系的模拟研究

Simulation of Alcohol Ternary Mixture Separation by Dividing Wall Column

采用分壁式精馏塔分离乙醇-正丙醇-正丁醇三元物系,通过Aspen Plus软件对其进行严格计算。模拟优化之后的塔设备参数和操作条件为:主塔理论板数为35块,进料段理论板数为16块,回流比为9.15,在进料段的第9块板处进料,侧线出料位置为第18块板,隔板的上下端连接位置分别为主塔第10块板和第27块板。与常规的两塔精馏相比,再沸器热负荷减少33.79%。

Dividing Wall Column was used to separate alcohol ternary mixture of ethanol, 1-propanol and nbutanol. Rigorous calculation of the separation was executed by Aspen Plus software. Column parameters and operation conditions were ascertained by simulation and optimization： 35 theoretical plates in main column, 16 theoretical plates in feed segment, reflux ratio 9.15, feeding plate at 9a plate of feed segment, lateral line discharging plate at 18^th plate of the main column, upper link position of dividing wall at 10^th plate and lower link position of it at 27^th plate of the main column. Compared with the direct sequence of conventional distillation, re-boiler duty was reduced by 33.79%.