Accuracy of empirical correlations for estimating diffusion coefficients in aqueous organic mixtures
Accuracy of empirical correlations for estimating diffusion coefficients in aqueous organic mixtures
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DOI：
10.1021/ac961005a
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发表时间：
1997-07-01
影响因子：
7.4
通讯作者：
Carr, PW
中科院分区：
文献类型：
--
作者：
Li, JW;Carr, PW
在甲醇/水和乙腈/水组成（10-100%体积有机物）中，用Aris-Taylor开管法在30 - 60 ℃范围内测定了烷基苯和烷基苯酮的同系扩散系数。的测量值进行了比较，估计来自五个最常见的经验相关性，甲醇混合物的Wilke-Chang，Scheibel，和Lusis-Ratcliff相关性的误差通常小于20%，Scheibel，Wilke-Chang，和Hayduk-Laudie相关性的工作比其他乙腈/水混合物。总的来说，Scheibel相关性显示出最小的误差，我们建议使用更广泛使用的Wilke-Chang方法的系统在这里研究。我们还开发了拟合方程估计粘度，使扩散系数可以很容易地估计。
Diffusion coefficients for a homologous series of alkylbenzenes and alkylphenones have been measured by the Aris-Taylor open tube method from 30 to 60 degrees C over a wide range in methanol/water and acetonitrile/water compositions (10-100% by volume of organic). The measurements were compared to estimates derived from five of the most common empirical correlations, The errors for methanolic mixtures by the Wilke-Chang, Scheibel, and Lusis-Ratcliff correlations are usually less than 20%, The Scheibel, Wilke-Chang, and Hayduk-Laudie correlations work better than others for acetonitrile/water mixtures. Overall, the Scheibel correlation shows the smallest errors, and we recommend its use to that of the more widely used Wilke-Chang method for the systems studied here. We have also developed fitting equations for estimating viscosity so that the diffusion coefficients can be easily estimated.