Correlation and prediction of dense fluid transport coefficients. VI.n-alcohols

Abstract

A previously described method, based on considerations of hard-sphere theory, is used for the simultaneous correlation of the coefficients of viscosity, selfdiffusion, and thermal conductivity for the n-alcohols, from methanol to n-decanol, in excellent agreement with experiment, over extended temperature and pressure ranges. Generalized correlations are given for the roughness factors and the characteristic volume. The overall average absolute deviations of the experimental viscosity, self-diffusion, and thermal conductivity measurements from those calculated by the correlation are 2.4, 2.6, and 2.0%, respectively. Since the proposed scheme is based on accurate density values, a Tait-type equation was also employed to correlate successfully the density of the n-alcohols. The overall average absolute deviation of the experimental density measurements from those calculated by the correlation is +0.05%.

Diffusion Coefficients of Carbon Dioxide in Eight Hydrocarbon Liquids at Temperatures between (298.15 and 423.15) K at Pressures up to 69 MPa

“…The rough-hard-sphere theory has been successfully used in various forms to correlate transport properties of both pure [19][20][21][22][23][24][25][26] and binary systems. 21,[27][28][29][30][31] For mutual diffusion, the theory may be built up starting from the kinetic-theory expression for the mutual diffusion coefficient of a dilute binary mixture of smooth hard spherical molecules: …”

Correlation and prediction of dense fluid transport coefficients. VII. Refrigerants

“…For nonpolar compounds [ 1-5] these parameters were found to be constant characteristic only of the liquid and the property. In the case of the polar n-alcohols [6], however, these parameters were found to be weak functions of the temperature. It should also be pointed out here that the above analysis, in all previous work, included equivalent relations for the self-diffusion coefficient.…”

“…account for deviations from the behavior of smooth hard spheres [1]. In the case of pure n-alkanes [1], aromatic hydrocarbons [5], and n-alcohols [6], experimental measurements were used to calctdate the temperature dependence of the characteristic molar volumes and the values of parameters R, and R;. For nonpolar compounds [ 1-5] these parameters were found to be constant characteristic only of the liquid and the property.…”

“…~ Chemistry Department, University of Glasgow, Glasgow G12 8QQ, United Kingdom. confidence to predict transport coefficients for these compounds under other conditions of temperature and pressure. The method has also been applied to simple organic molecular liquids [2] and has been extended to n-alkane mixtures [3], aromatic hydrocarbons [5], and n-alcohols [6]. It has been demonstrated that this scheme can lead to predictions of transport coefficients for these systems, at pressures up to 600 MPa, with an uncertainty of + 5 %.…”

“…To overcome this, a generalized Tait-type equation was employed to correlate the density of n-alkanes [8] and n-alcohols [6]. This, in conjunction with the aforementioned scheme, allowed the calculation of the transport properties of n-alkanes and their mixtures and of n-alcohols as a function of temperature and pressure, rather than density.…”