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Journal of Non-Equilibrium Thermodynamics

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Editor-in-Chief: Hoffmann, Karl Heinz

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Cellulose Acetate Polymeric Membrane Fabrication by Nonsolvent-Induced Phase Separation Process: Determination of Velocities of Individual Components

Mashallah Rezakazemi
  • Faculty of Chemical and Materials Engineering, 68259 Shahrood University of Technology, Shahrood, Iran
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/ Alireza Hemmati
  • Department of Chemical Engineering, Faculty of Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
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/ Saeed Shirazian
  • Corresponding author
  • Department for Management of Science and Technology Development, 469882 Ton Duc Thang University, Ho Chi Minh City, Vietnam
  • Faculty of Applied Sciences, 469882 Ton Duc Thang University, Ho Chi Minh City, Vietnam
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Published Online: 2018-11-14 | DOI: https://doi.org/10.1515/jnet-2018-0042

Abstract

In this work, the velocities of individual components during the immersion process using mathematical modeling of a nonsolvent-induced phase separation process are investigated. For this purpose, a mass average velocity correction factor was defined as the ratio of mass average velocity in the absence of a zero polymer velocity assumption to the mass average velocity with zero polymer velocity assumption. The velocities were computed and the result was coherent with observations of a considered case study. It was concluded that the polymer moves towards the interface, as the sign of the polymer velocity at early moments of immersion was positive, which is in accord with accumulation and vitrification of the polymer at the interface. The positive sign of the solvent and the negative sign of nonsolvent are in accord with the observations as solvent leaves the cast film and nonsolvent penetrates into the film. The reduction of velocity values to the order of magnitude of diffusivities is in accord with the limiting role of the rigid skin layer for mass exchanges. Relatively large velocity values of the solvent rather than the nonsolvent imply that much more solvent is probably left in the cast film rather than the nonsolvent enters into it as observed by densification of the cast film.

Keywords: membrane; nonsolvent-induced phase separation; individual component velocities

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About the article

Received: 2018-07-25

Revised: 2018-10-08

Accepted: 2018-10-19

Published Online: 2018-11-14


Citation Information: Journal of Non-Equilibrium Thermodynamics, ISSN (Online) 1437-4358, ISSN (Print) 0340-0204, DOI: https://doi.org/10.1515/jnet-2018-0042.

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