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A Mixing Rule Based on WS Rule for Prediction of Phase Behavior of Polymer Solutions

Abbasi, Akram | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40618 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cirus; Taghikhani, Vahid
  7. Abstract:
  8. The cubic equation of state (CEOS) is a powerful method for calculation of (vapor + liquid) equilibrium (VLE) in polymer solutions. However, the traditional mixing rules are not appropriate to extend the CEOS to non-ideal mixtures such as polymer solutions. For better prediction of (vapor + liquid) equilibria in polymer solutions, it is better to use mixing rules based on Excess Gibbs free energy function, GE. Choosing an appropriate excess Gibbs free energy for a mixing rule is a major step. In this work, by using three EOS (PRSV, Dashtizadeh and SRK) with FH-NRTL-NRF excess Gibbs free energy model and Wong–Sandler mixing rule, the EOS/GE method is applied for prediction of phase equilibrium of polymer solutions. It should be mentioned that the NRTL-NRF model in terms of volume fraction of polymer and solvent (instead of mole fraction) must be used. The results show that EOS/GE approach is an appropriate method for prediction of (vapor + liquid) equilibrium in polymer solutions. It is also shown that PRSV EOS has better accuracy, although Dashtizadeh EOS –with one parameter less than PRSV- has the same accuracy except in PPG-water and PEG-water systems.

  9. Keywords:
  10. Cubic State Equations ; Vapor-Liquid Equilibrium (VLE) ; Polymeric Solution ; Dashtizadeh State Equation ; New Mixing Rules ; NonRandom Two Liquid-NonRandom Factor (NRTL-NRF)Model

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