Partitioning of a polydisperse nonionic surfactant (nonyl phenol ethoxylate) between water and hexane

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Abstract

The partitioning behavior of a polydisperse nonyl phenol polyethoxylate of an average ethylene oxide (EO) chain length of 7.3 units (N7.3) between water and hexane has been studied as a function of temperature and total surfactant concentration. A complete analysis of all components of the polydisperse mixture in both the oil and water phases was made using a high-resolution capillary GC column and on column injection. Thermodynamic parameters ΔGW→Oo, ΔHW→Oo and ΔSW→Oo have been obtained for the total surfactant system and the individual components. An ideal mixing, phase separation model has been applied to calculate theoretical partitioning behavior as a function of temperature and surfactant concentration, above and below the critical micelle concentration. Excellent agreement between theory and experimental results was obtained.

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    Current address: ICI Australia Operations Pty. Ltd., Speciality Chemicals Group, Surface Science Laboratory, Newsom Street, Ascot Vale, Victoria, 3364, Australia.

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