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叔丁醇、异丙醇和水易形成二元和三元共沸,此共沸体系无法采用常规精馏等方法进行分离。本文分别以乙二醇、环丁砜和乙二醇为萃取剂,NRTL为平衡模型,采用Aspen Plus软件对叔丁醇-异丙醇-水分离的三塔萃取精馏过程进行模拟。分别考察了三塔的塔顶出料量、回流比、溶剂比、塔板数及原料进料位置等因素对分离效果的影响。并设计正交实验方案,对分离过程进行进一步优化,确定过程条件对叔丁醇和异丙醇的纯度及收率的影响,为叔丁醇-异丙醇-水体系分离提供基础数据。结果表明,在优化条件下,可得到纯度和收率为99.87%和94.29%的叔丁醇、纯度和收率为98.69%和89.38%的异丙醇。
Tert-butanol, isopropanol and water to form a binary and ternary azeotropic, the azeotropic system can not be separated by conventional methods such as distillation. In this paper, ethylene glycol, sulfolane and ethylene glycol as extractants, NRTL as a balance model, using Aspen Plus software t-butanol - isopropanol - water separation of the three-column extractive distillation process simulation. The influences of the factors such as the amount of material discharged from the top of the three towers, the reflux ratio, the solvent ratio, the number of plates and the feed position of the feedstock on the separation efficiency were investigated respectively. Orthogonal experimental design was designed to further optimize the separation process to determine the influence of process conditions on the purity and yield of tert-butanol and isopropanol, and to provide basic data for the separation of tert-butanol-isopropanol-water system. The results showed that under the optimized conditions, the yield of tert-butanol with purity and yield of 99.87% and 94.29%, and the purity and yield of isopropanol of 98.69% and 89.38% were obtained.