基于ASPEN PLUS模拟共沸精馏分离吡啶-水

Separation of Azeotropic Distillationof Pyridine-Water by ASPEN PLUS

本课题选用共沸精馏的方法,经过多种溶剂筛选,选出正己烷作为共沸剂,利用Aspen Plus模拟软件中NRTL活度方程作为模型,对流程反应进行了模拟计算。辨析了理论塔板数、进料位置和回流比等单一变量对塔釜产物产率的影响。研究结果表明,当塔1的进料位置和理论塔板数为20和21,回流比为1.75时,水的分离率可达到1,当塔2的进料位置和理论塔板数分别为5和37时,塔釜吡啶分离率可达99.98%。

In this paper, the azeotropic distillation method is selected, n-hexane is selected as azeotropic agent through screening of various solvents, and the nrtl activity equation in aspen plus simulation software is used as a model to simulate the process reaction. The effects of single variables such as theoretical tray number, feed position and reflux ratio on the product yield in the bottom of the column were analyzed. finally, when the feed position and theoretical plate number of the first tower distillation column was 20 and 21, and reflux ratio was 1.75, the separation rate of water reaches 1, the feed position and theoretical plate number of the second tower was 5 and 37, respectively, the separation rate of pyridine in the column bottom was 99.98 %.