EG-EGDA分离萃取剂的筛选及其萃取工艺模拟  

Screening of EG-EGDA separation extractant and its extraction process simulation

作　　者：曹江婷 陈布天 程晓亮 刘娜 代方方 王晨[1] CAO Jiang-ting;CHEN Bu-tian;CHENG Xiao-liang;LIU Na;DAI Fang-fang;WANG Chen(Key Laboratory of Auxiliary Chemistry&Technology for Chemical Industry,Ministry of Education,Shaanxi University of Science&Technology,Xi′an 710021,China;Changqing Chemical Group,Xi′an 710021,China)

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021 [2]长庆化工集团,陕西西安710021

出　　处：《陕西科技大学学报》2024年第2期103-109,115,共8页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21706150);陕西省大学生创新创业训练计划项目(S202210708118)。

摘　　要：乙酸与乙二醇(EG)的直接酯化法是合成乙二醇二乙酸酯(EGDA)的常用方法,然而,针对产物体系中EG-EGDA共沸物分离萃取剂的选择研究较少.利用COSMO-SAC模型,评价了萃取剂甲苯、邻二甲苯、间二甲苯、乙苯对EG-EGDA体系的萃取效果.结果表明,四种萃取剂萃取性能遵循乙苯>间二甲苯>甲苯>邻二甲苯规律,乙苯的表面屏蔽电荷主要分布在非极性区,同时具有较大的峰面积,表明乙苯萃取分离共沸体系的能力最强.使用Othmer-Tobias和Hand方程对相平衡数据的可靠性进行验证,相关系数R 2均大于0.99.以乙苯为萃取剂,采用Aspen Plus软件对萃取分离EG-EGDA的工艺进行模拟优化,结果表明,萃取塔最佳塔板数为4,最佳进料为250 kg/h.回收塔最佳塔板数为7,最佳进料板位置为4,溶剂回收塔的摩尔回流比为2.5,在最优工艺参数下,得到EGDA的回收率为98.15%,模拟结果为分离EG-EGDA的工业研究提供了理论基础.The direct esterification of acetic acid with ethylene glycol(EG)is a common method for the synthesis of ethylene glycol(EGDA).However,few studies have focused on the selection of extractants for the separation of EG-EGDA azeotrope.The COSMO-SAC model was used to evaluate the extraction efficiency of the EG-EGDA system with toluene,o-xylene,m-xylene and ethylbenzene as extractors.The results showed that the extraction performance of the four extraction agents followed the order of ethylbenzene>m-xylene>toluene>o-xylene.The surface shielding charge of ethylbenzene was mainly distributed in the non-polar region and had a large peak area,indicating that ethylbenzene had the strongest ability to extract and separate the azoic system.The reliability of the phase equilibrium data was verified using the Othmer-Tobias and Hand equations,with correlation coefficients R 2 all higher than 0.99.Using ethylbenzene as the extractive solvent,the extraction process of ethylene glycol and ethylene glycol diacetate was simulated and optimized by Aspen Plus software.The results showed that the optimal number of column plates was 4,and the optimal feed was 250 kg/h.The optimal number of plates in the recovery column is 7,the optimal position of the feed plate is 4,and the molar reflux ratio of the solvent recovery column is 2.5.Under the optimal process parameters,the recovery rate of ethylene glycol diacetate is 98.15%.The simulation results provide a theoretical basis for industrial research on the separation of ethylene glycol-ethylene glycol diacetate.

关 键 词：乙二醇 乙二醇二乙酸酯 萃取剂筛选 COSMO-SAC模型 过程模拟 

分 类 号：TQ028.3[化学工程]