| Autor: |
Kilian, H. G., Lagaly, G., Degiorgio, V., Voca, B. R., Canselier, J. P., Noik, C., Bavière, M. |
| Zdroj: |
Trends in Colloid & Interface Science II; 1988, p144-152, 9p |
| Abstrakt: |
Phase diagrams of multicomponent systems containing α-olefinsulfonates are investigated within the framework of enhanced oil recovery. The relationship between the optimum salinity NaCl* and the alkane chain-length is logarithmic at low cosurfactant concentration and linear at higher concentration. At a given brine-to-oil ratio the variation of alcohol concentration alone is almost sufficient to account for the variations in the NaCl* values at the point common to the four Winsor regions. The change in the solubilization parameter SP* is a bit more sensitive to the effect of alcohol than to that of electrolyte. The effect of the overall alcohol-to-sulfonate ratio (A/S) on both NaCl* and SP* is explained with composition data. As the surfactant concentration decreases with constant alcohol content, the A/S ratio in the interfacial structures increases. Thus, the presence of alcohol molecules, reducing the density of surfactant at the interface, decreases surfactant efficiency. Besides, NaCl* decreases when the alcohol concentration increases in each phase. Alcohol concentrations can be calculated by means of the pseudophase model, as can the salt enrichment of the excess aqueous phase when NaCl brines are used. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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