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Behavior of an organic solvent drop during the supercritical extraction of emulsions

  1. Facundo Mattea1,2,
  2. Ángel Martín1,2,3,*,
  3. Constantin Schulz4,
  4. Philip Jaeger4,
  5. Rudolf Eggers4,
  6. María José Cocero1,2

Article first published online: 23 OCT 2009

DOI: 10.1002/aic.12061

Issue

AIChE Journal

AIChE Journal

Volume 56, Issue 5, pages 1184–1195, May 2010

Additional Information

How to Cite

Mattea, F., Martín, Á., Schulz, C., Jaeger, P., Eggers, R. and Cocero, M. J. (2010), Behavior of an organic solvent drop during the supercritical extraction of emulsions. AIChE Journal, 56: 1184–1195. doi: 10.1002/aic.12061

Author Information

  1. 1

    High Pressure Processes Group, Dept. of Chemical Engineering and Environmental Technology, University of Valladolid, Valladolid 47011, Spain

  2. 2

    Universidad de Valladolid, Facultad de Ciencias, Prado de la Magdalena s/n, Valladolid 47011, Spain

  3. 3

    Lehrstuhl für Verfahrenstechnische Transportprozesse, Ruhr Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany

  4. 4

    Technical University Hamburg-Harburg, Process Engineering II, Heat and Mass Transfer, Eiβendorfer Str. 38, 21073, Hamburg, Germany

*High Pressure Processes Group, Dept. of Chemical Engineering and Environmental Technology, University of Valladolid, Valladolid 47011, Spain

Publication History

  1. Issue published online: 14 APR 2010
  2. Article first published online: 23 OCT 2009
  3. Manuscript Revised: 22 JUL 2009
  4. Manuscript Received: 25 MAY 2009

Funded by

  • Spanish Ministry of Science and Education. Grant Numbers: CTQ2006-02099, ERT EPSS 007767 PROBIOMAT project
  • National Starch Food Innovation (Hamburg, Germany)
  • Hamburg University of Technology (Germany)
  • Alexander von Humboldt foundation (Germany)

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Keywords:

  • interfacial tension;
  • supercritical carbon dioxide;
  • β-carotene;
  • n-octenyl succinic anhydride (OSA)-modified starch;
  • image analysis

Abstract

The behavior of a drop of dichloromethane in water in contact with CO2 at high pressure has been investigated with the purpose of analyzing the phenomena that takes place during the supercritical fluid extraction of emulsions process. Experiments have been performed with and without a solute (β-carotene) and a surfactant (n-octenylsuccinic anhydride-modified starch) dissolved in the drop, and the evolution of the drop volume as well as of the interfacial tension between the drop and the aqueous phase has been measured. Additionally, a mathematical model has been developed that allows describing the mass transfer. Results show that the drop undergoes swelling and shrinking processes due to diffusion of CO2 into the drop and dichloromethane out of the drop. CO2 concentration in the drop can be as high as 0.9 (molar fraction). Emulsion drops behave as miniature gas antisolvent precipitators and many particles are formed inside the drop. The interfacial tension between the drop and the aqueous phase increases during the process, therefore destabilizing the emulsion. © 2009 American Institute of Chemical Engineers AIChE J, 2010

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