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Surfactant Effects on Mass Transfer in Liquid-Liquid Systems

  • M. Alcina Mendes
Part of the International Centre for Mechanical Sciences book series (CISM, volume 463)

Abstract

This paper reviews the work done by the author and co-workers on the effect of surfactants on mass transfer in binary and ternary liquid-liquid systems. A Schlieren optical apparatus has been used to visualise the selected organic-aqueous interfaces during the mass transfer process, when the aqueous phase was “clean” or “contaminated” by soluble ionic and non-ionic surfactants. Molar fluxes, in the same liquid-liquid systems, have been measured with a Mach-Zehnder interferometer. Results obtained in the laboratory and under microgravity conditions are included. The most significant finding is that the addition of some surfactants to the partially miscible binary liquid-liquid systems investigated can induce or increase interfacial convection which enhances the initial mass transfer rates in comparison with values predicted by Fick’ s law. This effect is of great relevance to industrial processes where surfactants may be used advantageously to manipulate interfacial stability and particularly in space applications, where it may be exploited to increase mass transfer in compensation for the lack of gravitational convection effects.

Keywords

Interfacial Tension Mass Transfer Rate Mass Transfer Process Marangoni Convection Schlieren Image 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Wien 2004

Authors and Affiliations

  • M. Alcina Mendes
    • 1
  1. 1.Department of Chemical Engineering and Chemical TechnologyImperial College LondonUK

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