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A Modified Local Composition-Based Model for Correlating the Vapor-Liquid and Liquid-Liquid Phase Equilibria of Aqueous Polymer-Salt Systems

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Abstract

In this research, a new local composition model has been proposed to study the vapor-liquid and liquid-liquid phase equilibria of polyelectrolyte solutions. The proposed model has been used in order to obtain the activity of water in polyethylene glycol (PEG) and polypropylene glycol (PPG) solutions. The interaction parameters introduced into the proposed model have been reported. The interaction parameters between the salt and water molecule have been estimated using the experimental mean ionic activity coefficients of aqueous electrolytes studied in this work. Also, the interaction parameters between the polymer and salt molecule, and the polymer and water molecule have been computed using the experimental activity of water data in aqueous polymer solutions. The results showed that the proposed model, segment-based Wilson and segment-based NRTL models have good accuracy in correlating the vapor-liquid phase equilibria of the water-polymer and water-polymer-salt systems.

Also, the liquid-liquid phase behavior of the polymer-salt aqueous two-phase systems has been correlated using the proposed model. The results show that the proposed model can more accurately correlate the phase behavior of aqueous two-phase systems than the UNIQUAC and the modified Wilson models.

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Authors and Affiliations

  1. Department of Chemical and Petroleum Engineering, Sharif University of Technology, Tehran, Iran

    Gholam Reza Pazuki, Vahid Taghikhani & Manuchehr Vossoughi

  2. Institute for Nano-science and Nano-technology, Sharif University of Technology, Tehran, Iran

    Manuchehr Vossoughi

Authors
  1. Gholam Reza Pazuki
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  2. Vahid Taghikhani
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  3. Manuchehr Vossoughi
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Correspondence to Manuchehr Vossoughi.

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Pazuki, G.R., Taghikhani, V. & Vossoughi, M. A Modified Local Composition-Based Model for Correlating the Vapor-Liquid and Liquid-Liquid Phase Equilibria of Aqueous Polymer-Salt Systems. J Solution Chem 37, 665–675 (2008). https://doi.org/10.1007/s10953-008-9259-1

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  • DOI: https://doi.org/10.1007/s10953-008-9259-1

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