Gel filtration chromatography of petroleum sulfonates

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Abstract

Sulfonated fractions of partially refined petroleum were chromatographed on Sephadex beads in water-95% ethanol (9:1). Each petroleum sulfonate was separated into two portions, a polymeric colloid fraction and an association colloid fraction. The composition of each sample with respect to these two fractions was calculated on a dry weight basis. For each sample, the initial micelle concentration of the association colloid fraction was determined from surface tension measurements and from gel filtration data. A comparison of the results showed that the two techniques yield critical micelle concentrations which differ by as much as a factor of four.

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