On the relationship between the carbon-number of n-paraffins and their solubility in supercritical solvents

A relationship is postulated between the solubility of liquid n-paraffins in supercritical solvents, such as methane and carbon dioxide, and the carbon number of the solute. The predictions of the simplified perturbed-hard-chain equation of state suggest that, at fixed temperature and pressure, the...

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Bibliographic Details
Published in:Fluid phase equilibria 1989, Vol.52, p.389-396
Main Authors: Peters, C.J., De Swaan Arons, J., Harvey, A.H., Sengers, J.M.H.Levelt
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solutions
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Summary:A relationship is postulated between the solubility of liquid n-paraffins in supercritical solvents, such as methane and carbon dioxide, and the carbon number of the solute. The predictions of the simplified perturbed-hard-chain equation of state suggest that, at fixed temperature and pressure, the logarithm of the mole fraction of the solute varies linearly with the carbon number. A relation of this type is very useful for predicting supercritical solubility of long n-alkanes and retrograde condensation of natural gas. We present the thermodynamic considerations that lend support to this hypothesis and we show that it agrees with available experimental data.
ISSN:0378-3812
1879-0224
DOI:10.1016/0378-3812(89)80344-9