Abstract
For biomolecules and cell particles purification and separation in biological engineering, besides the chromatography as mostly applied process, aqueous two-phase systems (ATPS) are of the most favorable separation processes that are worth to be investigated in thermodynamic theoretically. In recent years, thermodynamic calculation of ATPS properties has attracted much attention due to their great applications in chemical industries such as separation processes. These phase calculations of ATPS have inherent complexity due to the presence of ions and polymers in aqueous solution. In this work, for target ternary systems of polyethylene glycol (PEG4000)–salt–water, thermodynamic investigation for constituent systems with three salts (NaCl, KCl and LiCl) has been carried out as PEG is the most favorable polymer in ATPS. The modified perturbed hard sphere chain (PHSC) equation of state (EOS), extended Debye–Hückel and Pitzer models were employed for calculation of activity coefficients for the considered systems. Four additional statistical parameters were considered to ensure the consistency of correlations and introduced as objective functions in the particle swarm optimization algorithm. The results showed desirable agreement to the available experimental data, and the order of recommendation of studied models is PHSC EOS > extended Debye–Hückel > Pitzer. The concluding remark is that the all the employed models are reliable in such calculations and can be used for thermodynamic correlation/predictions; however, by using an ion-based parameter calculation method, the PHSC EOS reveals both reliability and universality of applications.
Acknowledgment
The author is grateful to research council at Islamic Azad University-Arak branch.
References
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©2016 by De Gruyter Mouton
Articles in the same Issue
- Frontmatter
- Review
- The Soret Effect in Liquid Mixtures – A Review
- Research Articles
- Calculation of NaCl, KCl and LiCl Salts Activity Coefficients in Polyethylene Glycol (PEG4000)–Water System Using Modified PHSC Equation of State, Extended Debye–Hückel Model and Pitzer Model
- Binary Mutual Diffusion Coefficients of Polymer/Solvent Systems Using Compressible Regular Solutions Theory and Free Volume Theory
- Comparative Analysis of Thermoeconomic Evaluation Criteria for an Actual Heat Engine
- Thermoeconomic Optimization of a Combined Heating and Humidification Coil for HVAC Systems
- A Lattice Boltzmann Model for Oscillating Reaction–Diffusion
Articles in the same Issue
- Frontmatter
- Review
- The Soret Effect in Liquid Mixtures – A Review
- Research Articles
- Calculation of NaCl, KCl and LiCl Salts Activity Coefficients in Polyethylene Glycol (PEG4000)–Water System Using Modified PHSC Equation of State, Extended Debye–Hückel Model and Pitzer Model
- Binary Mutual Diffusion Coefficients of Polymer/Solvent Systems Using Compressible Regular Solutions Theory and Free Volume Theory
- Comparative Analysis of Thermoeconomic Evaluation Criteria for an Actual Heat Engine
- Thermoeconomic Optimization of a Combined Heating and Humidification Coil for HVAC Systems
- A Lattice Boltzmann Model for Oscillating Reaction–Diffusion