乙醇/丙醇-水-复合溶剂体系汽液平衡研究  

Vapor-liquid equilibrium for ethanol/1-propanol-water-mixed solvents systems

作　　者：王洪海[1] 方静[1] 李春利[1] 高光英[2] 

机构地区：[1]河北工业大学化工学院,天津300130 [2]天津大学化工学院,天津300072

出　　处：《化学工程》2009年第11期40-43,共4页Chemical Engineering(China)

基　　金：河北省自然科学基金资助项目(B2006000018)

摘　　要：为研究复合萃取溶剂体系下醇-水的汽液平衡,分别选用盐质量浓度为0.2 g/mL的乙二醇+氯化锂、乙二醇+醋酸钾2种复合萃取溶剂,测定了101.3 kPa下不同溶剂体积比(0.5∶1,1∶1,2∶1)时乙醇-水和丙醇-水的汽液平衡数据。分别用W ilson和NRTL热力学模型对所测汽液平衡数据按拟三元体系进行了关联。利用工业规模的实验装置,对测定结果进行了验证。结果表明,复合萃取溶剂能使乙醇-水和丙醇-水体系的共沸点消失,大大改变了体系中醇与水的相对挥发度。关联结果表明,W ilson热力学模型较NRTL热力学模型更适于乙醇/丙醇-水复合萃取溶剂体系。工业规模生产数据验证了所测定数据的可靠性,乙醇产品纯度可达到99.85%。In order to study the vapor-liquid equilibrium （VLE） of the mixed solvents, the VLE data of ethanolwater-mixed solvents and 1-propanol-water-mixed solvents were determined at 101.3 kPa and in different solvent volume ratios of 0.5 ： 1, 1 ： 1, 2 ： 1, respectively, by selecting ethanediol ＋ lithium chloride and ethanediol ＋ potassium acetate as two kinds of mixed solvents with the salt mass concentration of 0.2 g/mL. Wilson model and NRTL model were used to correlate the VLE data as a ternary system. The test results were verified by an industrial-scale experimental device. It shows that two kinds of mixed solvents proposed can eliminate the azeotropic point of ethanol-water and 1-propanol-water system and increase the relative volatilities obviously. The correlation results show that the Wilson model is better than the NRTL model. The data of industrial production process proves that the determined data is reliable and the product purity can be as high as 99.85%.

关 键 词：乙二醇 醋酸钾 氯化锂 汽液平衡 NRTL模型 Wilson模型 

分 类 号：O642.42[理学—物理化学]