以二甲基亚砜为溶剂连续萃取精馏分离二异丙醚-异丙醇  

Separation of Diisopropyl Ether and Isopropyl Alcohol by Continuous Extractive Distillation with DMSO as Solvent

作　　者：杨再兴[1] 王蒙蒙[1] 杜绳 李静[1] 连明磊[1] 叶昆 

机构地区：[1]六盘水师范学院化学与化学工程系,贵州六盘水553004 [2]中国石油集团工程设计有限责任公司华北分公司,河北任丘062552

出　　处：《科技广场》2017年第2期120-122,共3页Science Mosaic

基　　金：贵州省科技厅联合基金项目(黔科合J字LKLS[2013]27号);贵州省教育厅教学内容与课程体系改革项目(编号:GZSJG10977201604);贵州省教育厅重点科研项目(黔教合KY字[2014]282);贵州省教育厅特色重点实验室项目([2011]278);贵州省普通高等学校煤系固体废弃物资源化技术创新团队(黔教合人才团队字[2014]46号);贵州省煤炭资源清洁高效利用科研实验平台(黔科平台[2011]4003号)

摘　　要：本文应用化工过程模拟软件Aspen Plus V7.3对二异丙醚-异丙醇最低共沸物系的连续萃取精馏过程进行了模拟与优化。通过绘制拟二元汽液平衡相图,筛选出合适的萃取剂为二甲基亚砜(DMSO),确定了双塔连续萃取精馏的工艺流程,并利用灵敏度分析工具考察了萃取精馏塔的全塔理论板数、原料进料位置、萃取剂进料位置、回流比、溶剂比(萃取剂对原料的摩尔比)对分离效果的影响。确定的最佳工艺方案为:全塔理论板数为20,原料和萃取剂分别在第15块和第5块理论板进料,回流比为0.5(mole),溶剂比为0.25(mass)。在此工艺条件下:萃取精馏塔塔顶二异丙醚的分离效果达99.86%,萃取剂再生塔塔顶异丙醇的纯度达到95.31%。模拟与优化结果为二异丙醚-异丙醇共沸物连续萃取精馏分离过程的设计和操作提供了参考。Continuous extractive distillation process for diisopropyl ether-isopropyl alcoholazeotropic system is simulated and optimized using Aspen Plus V7.3. By the pseudo-binary phase diagram, DMSO is selected as a suitable extractant. The process of continuous extractive distillation with two columns is confirmed. The separation effect of the number of theory stages,the mixture feed stage,the solvent feed stage,the reflux ratio and the mole ratio of extractant to mixture（solvent ratio） are investigated using sensitivity analysis tool. The optimal condition for the extractive distillation is as follows： the number of theory stages is 20,the mixture feed stage is 15 th,the solvent feed stage is5 th,the reflux ratio is 0.5（mole）,and the solvent ratio is 0.25（mass）. Under the technological condition： the separation effect of the top diisopropyl ether of the extractive distillation tower is up to 99.86%.The purity of isopropyl alcohol of the extractant-recovery column is 95.31%. The results are useful for the design and operation of continuous extractive distillation process for diisopropyl ether-isopropyl alcohol azeotropic system.

关 键 词：萃取精馏 ASPEN PLUS 二异丙醚 异丙醇 二甲基亚砜 

分 类 号：TQ028[化学工程]