乙酸乙酯-乙醇-水与甘油体系的液液平衡数据测定及关联  

Measurement and correlation of LLE data for ethyl acetate-ethanol-water

作　　者：程莹莹[1] 顾正桂[1,2] 黄杰军[1] 

机构地区：[1]南京师范大学江苏省萃取分离工程技术研究中心,江苏南京210097 [2]江苏沿江化工资源开发研究院,江苏南京210097

出　　处：《计算机与应用化学》2010年第11期1527-1530,共4页Computers and Applied Chemistry

摘　　要：液液平衡数据的测定及热力学模型的研究是化学工程中的重要内容之一,虽然目前已有大量的液液平衡数据发表,但仍有很多物系的相平衡数据有待于人们来测定和研究。本研究选取甘油作为乙酸乙酯液液萃取分离的萃取剂。采用色谱法测定乙醇在甘油中的无限稀释活度系数,并采用单参数法关联UNIQUAC方程中的模型参数;采用液液平衡釜测定乙酸乙酯-水、乙酸乙酯-甘油二元体系和乙酸乙酯-乙醇-甘油、乙酸乙酯-水-甘油、乙酸乙酯-乙醇-水三元体系LLE数据,采用最小方差法关联UNIQUAC方程中的模型参数,并关联二元及三元LLE数据;利用六对模型参数模拟四元LLE数据,并与实验值相比较,实验与计算误差均小于5%。实验值与模拟值吻合较好,精度满足要求,从而可以为液液萃取的工艺改进模拟计算提供可靠的热力学基础数据。另外该体系的液液相平衡数据对于乙酸乙酯的提纯有实际的应用价值。LLE data measurement and thermodynamic model research is one of the important contents of chemical engineering,though currently plenty of LLE data have been published,but there are still a lot of the LLE data needs to be measure and study by people.This study selected glycerol as extraction agent for the liquid-liquid extraction separation of ethyl acetate.The dilution activity coefficient of ethanol in glycerol was measured by the gas chromatogram apparatus,the parameters were simulated by the single parameter method in UNIQUAC equation.The LLE data of two compounds and three compounds were measured by LLE equilibrium pot,the model parameters of UNIQUAC equation were correlated by the minimum variance method,the LLE data of the two compounds and three compounds were correlated.The four compound LLE data were simulated by six parts model parameters,and compared with experiment data,the difference of experiment and calculation results was less than 5%,the experiment and correlation results were provided a basis for liquid-liquid extractive separation of ethyl acetate-ethanol-water.The results show that the simulation values using the model are consistent with the experiment data,which can meet the requirements and provide reliable thermodynamic basic data for the improvement of liquid-liquid extraction process and simulation calculation.Additionally this system of LLE data has practical application value for the purification of ethyl acetate.

关 键 词：乙酸乙酯 乙醇 水 甘油 LLE数据 

分 类 号：TQ015.9[化学工程] TP391.9[自动化与计算机技术—计算机应用技术]