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首页> 外文期刊>Fluid Phase Equilibria >Determination of the excess enthalpy of binary mixtures from the measurements of the heat of solution of the components: application to the perfluorohexane plus hexane mixture
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Determination of the excess enthalpy of binary mixtures from the measurements of the heat of solution of the components: application to the perfluorohexane plus hexane mixture

机译：从组分溶液的热测量确定二元混合物的过量焓：应用于全氟己烷加己烷混合物

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摘要

A calorimetric technique and a calculation procedure to obtain excess enthalpies H-E of liquid mixtures is described and tested. It is based on a heat-how calorimeter used as a titration calorimeter to measure the heat effects associated to small additions of one of the components, or a mixture of them, to the ampoule containing a known amount of the other component or of a mixture of them. The procedure takes into account the presence of a small vapour space and calculates the heat involved in the vapour-liquid equilibration after each addition. The experimental values are fitted with a parametric equation such as Redlich-Kister to determine the H-E parameters by least-squares adjustment. The technique has been tested with respect to the systems ethanol + cyclohexane, dioxane + water and tetrachloromethane + benzene. The results show a good agreement with literature data for these mixtures, and confirm the capability of this technique to reliably replace the mix-flow technique when the components mix slowly, or show a mixture gap, or are available in small quantities. H-E results are reported for the system perfluorohexane + hexane for which the mixing process is slow. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 25]
机译：描述并测试了量热技术和计算程序以获得液体混合物的过量焓H-E。它基于用作量热法的热量计，用于测量与将一种组分或一种组分的少量添加到含有已知量的另一种组分或混合物的安瓿瓶中相关的热效应其中。该程序考虑到存在较小的蒸气空间，并计算每次添加后蒸气-液体平衡所涉及的热量。将实验值与参数方程式（例如Redlich-Kister）拟合，以通过最小二乘平差确定H-E参数。该技术已针对乙醇+环己烷，二恶烷+水和四氯甲烷+苯的体系进行了测试。结果表明与这些混合物的文献数据吻合良好，并证实了该技术在组分缓慢混合或显示出混合物间隙或少量可用时能够可靠地替代混合流技术的能力。报告了混合过程缓慢的全氟己烷+己烷体系的H-E结果。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：25]

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