LOCAL COMPOSITIONS IN THERMODYNAMIC EXCESS FUNCTIONS FOR LIQUID MIXTURES
LOCAL COMPOSITIONS IN THERMODYNAMIC EXCESS FUNCTIONS FOR LIQUID MIXTURES
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DOI：
10.1002/aic.690140124
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发表时间：
1968-01-01
期刊：
影响因子：
3.7
通讯作者：
PRAUSNITZ, JM
中科院分区：
文献类型：
--
作者：
RENON, H;PRAUSNITZ, JM
一个关键的讨论给出了使用本地组成的液体混合物的过量吉布斯自由能的表示。基于Scott的双液体模型和类似于Wilson所使用的非随机性假设，推导出一个新的方程。对于相同的活度系数在无限稀释，混合吉布斯能计算与新的方程以及货车Laar，威尔逊和海尔的方程，这四个方程给出了类似的结果为中度非理想的混合物，但他们明显不同的强烈非理想系统，特别是对于那些有限的可溶解性。新方程包含一个非随机参数α 12，使其适用于多种混合物。通过适当选择α12，新方程可以很好地代表许多类型的液体混合物，而其他局部组成方程似乎仅限于特定类型。考虑仅基于二元数据来预测三元气液平衡和三元液液平衡。
A critical discussion is given of the use of local compositions for representation of excess Gibbs energies of liquid mixtures. A new equation is derived, based on Scott's two‐liquid model and on an assumption of nonrandomness similar to that used by Wilson. For the same activity coefficients at infinite dilution, the Gibbs energy of mixing is calculated with the new equation as well as the equations of van Laar, Wilson, and Heil; these four equations give similar results for mixtures of moderate nonideality but they differ appreciably for strongly nonideal systems, especially for those with limited miscibility. The new equation contains a nonrandomness parameter α12which makes it applicable to a large variety of mixtures. By proper selection of α12, the new equation gives an excellent representation of many types of liquid mixtures while other local composition equations appear to be limited to specific types. Consideration is given to prediction of ternary vapor‐liquid and ternary liquid‐liquid equilibria based on binary data alone.