萃取精馏分离叔丁醇-异丙醇-水共沸体系的研究与优化

The research and optimization of extractive distillation for tert butyl alcohol-isopropanol-water azeotropic system

用传统的蒸馏方法不能分离共沸体系,而采用萃取精馏分离共沸体系可以达到很好的效果。本文以乙二醇为萃取剂,采用Aspen Plus化工模拟软件对叔丁醇-异丙醇-水的共沸体系萃取精馏过程进行模拟分析,并利用软件中的灵敏度分析考察了回流比、原料进料位置、萃取剂进料位置、进料比、塔顶出料比这些因素对分离效果的影响。利用正交实验,进一步优化工艺参数。结果表明:在最优工艺条件下,塔顶醇的质量含量达到99.8%。本文提出了萃取精馏实现工业化的条件,为叔丁醇-异丙醇-水共沸体系分离的工业化提供了理论依据。

Azeotropic system can not be separated by the traditional method of distillation,but the separation effect can get better by using extractive distillation. In this paper, Simulation of extractive distillation for ter tbuty alcohol-isopropanol-water azeotropic mixture was executed by the chemical engineering software Aspen Plus with using ethylene glycolas the extractant.In order to optimize the operating conditions, we examined six factors through the sensitivity analysis in sofeware, these factors including reflux ratio, raw material feed stage,extraction agent feed stage, theoretical plate number, solvent ratio and overhead distillate ratio. The technologic parameter was optimized through the orthogonal experimentation. The simulation result shows that the mass fraction of alcohol can reach 99.8% under the best operating conditions. The simulation provided a theoretical basis for the extractive distillation of tert buty alcohol-isopropanol-water azeotropic mixture.