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• W1965637951 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. Introduction Adsorption of surfactant from aqueous solutions has attracted considerable interest in recent years primarily because of its importance in enhanced oil primarily because of its importance in enhanced oil recovery. Recent studies have added to our understanding of the adsorption mechanism and are helpful in guiding the selection of new, minimally adsorbing surfactants. This, however, is not a sufficient criterion on which to base the choice of a surfactant; one must also consider the phase behavior of the oil/water/surfactant system and no doubt take into account a host of other properties such as microemulsion viscosity, polymer-surfactant interactions, etc., all of which may play an important role in the displacement process. In this paper we consider the adsorption of surfactant onto a well-characterized alumina surface from excess aqueous phases which are in equilibrium with optimal middle phase microemulsions. Thus, for the first time both optimum phase behavior and the corresponding adsorption are considered collectively. For a given surfactant, the results presented here show that, even if all of the systems compared are optimum ones, both the adsorption and the solubilization differ widely depending on the salinity, the hydrocarbon ACN, and the alcohol concentration. Thus, the performance of a given surfactant may vary from mediocre to outstanding even if the system has been carefully optimized. For the two surfactants tested, a strong correlation between adsorption and solubilization was found. If, for example, the hydrocarbon ACN was held constant and the salinity and alcohol concentration varied so as to maintain a sequence of optimum systems, a maximum in the solubilization was found. At or near this same salinity a minimum of adsorption was also seen to exist. Thus, it would appear, based on the results obtained to date, that steps taken to increase solubilization will also tend to reduce adsorption. OPTIMUM SYSTEMS The phase behavior and solubilization of a 1 wt % sodium chloride solution taken together with a surfactant, cosolvent (secondary butanol), and various alkane hydrocarbons are shown in Figure 1. The graph shows that by systematically increasing the alkane carbon number (ACN), which is termed an ACN scan, one can affect a transformation from a Type II system (microemulsion in equilibrium an excess aqueous phase) to a Type I system (microemulsion in equilibrium with an excess oil phase). At intermediate values of the ACN, three phases are observed as indicated in Figure 1. The solubilization is defined as the volume of oil (Vo) or volume of water (Vw) which is contained in the middle phase per volume of surfactant (Vs). The optimum system per volume of surfactant (Vs). The optimum system is defined as the one for which Vo/Vs = Vw/Vs (solubilization at optimum)." @default.
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• W1965637951 date "1982-09-26" @default.
• W1965637951 modified "2023-09-27" @default.
• W1965637951 title "Compositional Effects on the Adsorption of Surfactant From Aqueous Phases in Equilibrium With a Middle Phase Microemulsion" @default.
• W1965637951 doi "https://doi.org/10.2118/11212-ms" @default.
• W1965637951 hasPublicationYear "1982" @default.
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