Three-phase behavior of brine/alkane/alcohol/alpha-olefinsulfonate mixtures

  • B. R. Voca
  • J. P. Canselier
  • C. Noik
  • M. Bavière
Amphiphile Solutions
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 76)


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.

Key words

Surfactant microemulsion phase diagram α-olefinsulfonate pseudophase model surface efficiency influence of alcohol concentration Winsor regions 


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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1988

Authors and Affiliations

  • B. R. Voca
    • 2
  • J. P. Canselier
    • 2
  • C. Noik
    • 1
  • M. Bavière
    • 1
  1. 1.Institut Français du PétroleRueil-MalmaisonFrance
  2. 2.Ecole Nationale Supérieure d’Ingénieurs de Génie Chimique Chemin de la LogeToulouseFrance

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