Abstract
PurposeTo prepare surfactants and use as pour point depressants for a waxy gas oil.Design/methodology/approachSome anionic surfactants (Calcium O, P.dioctyl benzene sulphonate and calcium hexadecyl benzene sulphonate) were prepared in the laboratory. The physicochemical characteristics were investigated. The adsorption behavior of these surfactants at air/solution and oil/solution interfaces were investigated by measuring the surface tension and interfacial tension as functions of concentration.FindingsThe surface parameters and free energies of micellization and adsorption confirm the decreasing and improving of pour point by prepared surfactants. It is found that there is a good relation between surface properties especially interfacial tension of the prepared surfactants and their efficiency in depressing the pour point. Also, the results indicating that anionic surfactants can be improved pour point of waxy gas oil.Originality/valueAddresses long‐standing problem in the petroleum industry.
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