加盐萃取精馏制取无水乙醇的过程模拟

以改进的LIQUAC模型为热力学基础,编写了计算电解质溶液汽液平衡的子程序,并将其链接到化工流程模拟软件PRO/Ⅱ5.10中,进而模拟了加盐萃取精馏制取无水乙醇的工艺流程。模拟结果与工业生产的实际情况基本符合。在此基础上,将此工艺与本文及其它文献中模拟的溶盐精馏、萃取精馏和共沸精馏等各种制取无水乙醇的工艺进行了比较研究。

Simulation of the process of extractive distillation with salt for anhydrous ethanol

The aim of this work is to simulate the process of extractive distillation with salt for purification of ethanol from the ethanol- water binary system. All the work was developed by PRO/II software, version 5.10, having as goal to get the anhydride ethanol(99. 8wt. % ) . The module for calculating activity coefficients of mixed - solvent electrolyte systems that was embedded in PRO/II by this work was programmed with user - added subroutines provided by PRO/II, using the modified LIQUAC model[1] . In the development of this study, the extractive distillation with salt for recovering anhydrous ethanol, in which the ethylene glycol solution with salt is selected for the agent, was simulated successfully , and the results accord with those of the industry production with satisfying accuracy. Finally, a comparative study among the processes of extractive distillation with salt, saline extractive distillation, extractive distillation without salt(conventional extractive distillation) and azeotropic distillation was carried out.