Abstract
ABSTRACT Adsorption onto nonporous alumina from an excess aqueous phase in equilibrium with an optimum middle phase microemulsion and the corresponding solubilization have been measured as a function of isopentanol concentration, sodium chloride concentration, and alkane molecular weight for 4-dodecyl benzene sulfonate and 4-tridecyl benzene sulfonate. The concentration of isopentanol was adjusted so that each system was optimal. A multilinear regression analysis and a designed set of experiments were used to construct contours in the optimal plane--coordinate axes represented by the logarithm of salinity and hydrocarbon alkane carbon number (ACN). These contour plots showed that at a constant ACN, the solubilization parameter exhibits a maximum and adsorption a minimum when the electrolyte concentration is increased. Two different surfactants were studied. It was found that the one having the longer hydrocarbon tail yielded a larger solubilization and a smaller adsorption.
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