乙二醇萃取精馏分离异丙醇-正丙醇-水三元混合体系的流程模拟与优化  

Simulation and Optimization of Separation Process of Isopropanol-n-PropanolWater Ternary Hybrid System by Ethylene Glycol Extractive Distillation

作　　者：余期捷 路战胜 李诺 陈双强 徐毅[1] YU Qi-jie;LU Zhan-sheng;LI Nuo;CHEN Shuang-qiang;XV Yi(School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学环境与化学工程学院,上海200444

出　　处：《当代化工》2022年第12期2973-2980,共8页Contemporary Chemical Industry

基　　金：国家自然科学基金-面上项目(项目编号:21975154)。

摘　　要：利用Aspen Plus软件,采用NRTL模型,选择乙二醇(EG)作为萃取剂来分离异丙醇(IPA)、正丙醇(NPA)和水,证明了EG能够很好地分离三元混合物,得到优等品IPA(≥99.96%)和一等品NPA(≥99.5%),流程所排废水为一类废水。该工艺综合考虑原料分离效果和精馏塔热负荷2个指标,利用灵敏度曲线分析了各项参数对2项指标的影响,进而对各项参数做出优化,并分析了回流比-进料位置与分离效果关系以谋求分离条件下可达到的最低能耗。模拟结果可为维巴法生产得到IPA和NPA的精制工段提供理论依据,并能有效指导实际生产。By using Aspen Plus software and NRTL model, ethylene glycol(EG) was selected as the extractant to separate isopropanol(IPA), n-propanol(NPA) and water. It was proved that EG can separate ternary mixture well. The superior product IPA(≥99.96%) and first-class product NPA(≥99.5%) were obtained, and the wastewater discharged by the process was classⅠwastewater. In this process, two indexes of raw material separation and heat load of distillation column were considered comprehensively, and the sensitivity curve was used to analyze the influence of various parameters on the two indexes. Then, the parameters were optimized. In order to obtain the lowest energy consumption under separation conditions, the relationship between reflux ratio, feed position and separation effect was analyzed. The simulation results can provide a theoretical basis for the refining section of IPA and NPA produced by Veba method, and can effectively guide the actual production.

关 键 词：萃取精馏 异丙醇 正丙醇 乙二醇 优化 

分 类 号：TQ028[化学工程]