Effect of Temperature and Other Variables on the Optimum Formulation of Anionic Extended Surfactant–Alkane–Brine Systems

• Published in: Journal of surfactants and detergents Vol. 13; no. 1; pp. 69 - 73
• Main Authors: Velásquez, Josmary, Scorzza, Cesar, Vejar, Francia, Forgiarini, Ana M., Antón, Raquel E., Salager, Jean-Louis
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 2010; Springer Nature B.V
• Subjects: Alcohol; Aquatic Pollution; Chemical industry; Chemistry; Chemistry and Materials Science; Extended surfactant; Industrial Chemistry/Chemical Engineering; Microemulsion; Optimum formulation; Original Article; Physical Chemistry; Polymer Sciences; Sulfates; Surfaces and Interfaces; Surfactants; Temperature; Thin Films; Trends; Waste Water Technology; Water Management; Water Pollution Control; Alcohol; Temperature; Microemulsion; Extended surfactant; Optimum formulation
• ISSN: 1097-3958; 1558-9293
• DOI: 10.1007/s11743-009-1142-6

Anionic extended surfactants of the alkyl polypropylene oxide sulfate type are found to obey the linear correlation lnS =  k ACN for optimum formulation (three-phase behavior) of ionic surfactant–oil–water systems, with a k value essentially the same as for n -alkyl sulfates. The addition of n -pentanol produces a shift in optimum formulation without significant change in k . An increase in temperature is found to produce a decrease in surfactant hydrophilicity, which is opposite to the expected behavior of anionic species. This trend, which is typical of nonionic surfactant behavior, is probably due to the partial hydration of the very first propylene oxide units which are located close to the anionic head group.