物理化学学报 >> 1992, Vol. 8 >> Issue (05): 636-641.doi: 10.3866/PKU.WHXB19920512

研究论文 上一篇    下一篇

极性非质子溶剂与甲醇或1,2-二氯乙烷的汽液平衡

王沂轩; 赵健萍; 戴明   

  1. 河南化学研究所溶液室，郑州 450003
  • 收稿日期:1991-03-25 修回日期:1992-03-09 发布日期:1992-10-15
  • 通讯作者: 戴明

Vapor-Liquid Equilibrium for Some Polar Aprotic Solvents with Methanol or 1,2-Dichloroethane

Wang Yi-Xuan; Zhao Jian-Ping; Dai Ming   

  1. Research Laboratory of Solution Chemistry, Henan Institute of Chemistry, Zhengzhou 450003
  • Received:1991-03-25 Revised:1992-03-09 Published:1992-10-15
  • Contact: Dai Ming

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摘要： 使用双沸点仪测定了丙酮、乙酸乙酯、对二氧六环、乙腈或三乙胺与甲醇或1,2→二氯乙烷以及二者混合物等十一组二元体系在99.3 kPa下的汽液平衡数据(T,x,p), 计算了有关体系的过量吉布斯自由能。结果表明, 六种非质子溶剂与甲醇组成的二元系GE>0; 乙腈或三乙胺与1,2-二氯乙烷组成的二元系GE>0, 而丙酮、乙酸乙酯或对二氧六环与1,2-二氯乙烷的二元混合物GE<0。从同种分子间或不同种分子间的缔合作用对上述结果进行了讨论。本文还在固定极性非质子溶剂(第三组分)物质的量浓度的条件下, 测定了非质子溶剂+1,2-二氯乙烷+甲醇三元混合物的汽液平衡数据, 考察了非质子溶剂的加入对甲醇+1,2-二氯乙烷二元系GE的影响。

关键词: 汽液平衡, 过量吉氏自由能, 1,2-二氯乙烷, 甲醇

Abstract: Isobaric vapor-liquid equilibrium data have been measured at 99.3 kPa for the binary mixtures of acetone(AON), ethyl acetate(EA), p-dioxane (p-DXN), acetonitrile(AN) or triethylamine (TEA) with methanol or 1,2-dichloroethane (DCE) and of DCE with methanol by using a double ebulliometer. Van Laar equation and Wilson equation were used to correlate VLE data and Barker's method to estimate the vapor composi-tion from (T,x,p) data. Excess Gibbs free energies for the reported binary mixtures were also calculated from the two equations. The values of G~E for the methanol negative. The results are briefly discussed based on the hydrogen bonding between like and unlike molecules and some physical properties of aprotic solvents. Additionally, vapor-liquid equilibrium data for the ternary mixtures, aprotic solvent+MeOH+DCE, were also measured under the given concentration of aprotic solvent.

Key words: Vapor-liquid equilibrium, Excess Gibbs free energy, Methanol, 1,2-di-chloroethane