N-乙基乙二胺与乙二胺体系萃取精馏溶剂选择

基于改进的UNIFAC模型,以MATLAB语言开发了萃取精馏过程相对挥发度的计算程序。依据萃取精馏溶剂选择的基本原则、溶解性能评价、相对挥发度比较和溶剂再生性能等,对乙二胺和N-乙基乙二胺共沸体系萃取精馏溶剂进行筛选。研究结果表明:较为合适的萃取精馏溶剂为丙三醇和乙二醇,其中丙三醇更好,此时N-乙基乙二胺成为易挥发组分;溶剂比是重要的影响因素之一,溶剂比越大,被分离体系的相对挥发度越大,且溶剂比的影响主要集中在溶剂比15以下;原料组成对相对挥发度的影响较弱。

Solvent Selection for Separating N-ethylethylenediamine-Ethylenediamine System by Extractive Distillation

Based on modified UNIFAC model and MATLAB,a program has been developed for calculating the relative volatility of extractive distillation.According to the basic principle for selecting solvent for separating azeotrope system by extractive distillation,the soluble capacity,the relative volatility and the regenerative performance of solvent,the suitable solvents for separating ethylenediamine-N-ethylethylenediamine system by extractive distillation have been determined.The results show that the suitable solvents are ethylene glycol and glycerol,in which glycerol is better.When ethylene glycol and glycerol are solvents,N-ethylethylenediamine will become volatile component.At the same time,the effects of different raw material compositions and solvent ratio on the relative volatility were discussed.The results show that solvent ratio is one of the most important factors.The bigger the solvent ratio is,the greater the relative volatility of system is.The effect of raw material composition on relative volatility is weak.