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.