Abstract
The surface tensions of petroleum cuts were predicted using the modified UNIFAC group contribution method. Each petroleum cut was considered to be composed of three pseudocomponents: paraffinic, naphthenic and aromatic. The surface tension of the cut was predicted by calculating the bulk and surface activity coefficients, concentrations and surface tensions of the pseudo-components. The pseudocomponent surface tension was calculated from the critical properties using a corresponding state method. Crude oil cuts having boiling points ranging between 32 and 451°C were tested. Comparison of experimental and predicted surface tensions revealed quite good agreement, with a percentage absolute deviation of 4.1%.
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