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首页> 外文期刊>Fluid Phase Equilibria >Excess Gibbs energies and volumes of the ternary system chloroform + tetrahydrofuran + cyclohexane at 298.15K
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Excess Gibbs energies and volumes of the ternary system chloroform + tetrahydrofuran + cyclohexane at 298.15K

机译：298.15K时过量的吉布斯能量和三元体系氯仿+四氢呋喃+环己烷的体积

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摘要

Vapour-liquid equilibria and densities for the ternary system chloroform + tetrahydrofuran +cyclohexane and for the binary mixtures containing chloroform have been determined at 298.15 K. Vapour-liquid equilibrium data have been collected by head-space gas-chromatographic analysis of the vapour phase directly withdrawn from an equilibration apparatus. Density measurements have been carried out by means of a vibrating tube densimeter. Molar excess Gibbs energies GE and volumes V~E,as well as activity coefficients and apparent molar volumes of the components, have been obtained from the measured quantities and discussed. The binary chloroform + tetrahydrofuran displays negative deviations from ideality, while chloroform + cyclohexane positive deviations, for both volume and Gibbs energy. The GE's and V~E's for the ternary system are positive in the region rich in cyclohexane while negative in the region rich in chloroform + tetrahydrofuran. This indicates that hydrogen bonding between chloroform and tetrahydrofuran molecules produces negative values of GE and V~E and strongly influences the behaviour of the ternary system.
机译：三元系统氯仿+四氢呋喃+环己烷以及含氯仿的二元混合物的汽-液平衡和密度已在298.15 K下确定。通过汽相的顶空气相色谱法直接收集了汽-液平衡数据从平衡装置中退出。密度测量已经通过振动管密度计进行。摩尔过剩吉布斯能量GE和体积V〜E，以及各组分的活度系数和表观摩尔体积已从测量量中获得并进行了讨论。对于体积和吉布斯能量，二元氯仿+四氢呋喃显示出偏离理想值的负偏差，而氯仿+环己烷显示出理想值的负偏差。三元体系的GE和V E在富含环己烷的区域为正，而在富含氯仿+四氢呋喃的区域为负。这表明氯仿和四氢呋喃分子之间的氢键产生GE和V〜E的负值，并强烈影响三元体系的行为。

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