(Liquid + liquid) equilibrium of the ternary aqueous system containing poly ethylene glycol dimethyl ether 2000 and tri-potassium citrate at different temperatures |
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| Affiliation: | 1. Research Laboratory-III, Department of Chemical Engineering, Sant Longowal Institute of Engineering and Technology, Longowal, 148 106, Punjab, India;2. Biotechnology Research Laboratory, Department of Food Engineering and Technology, Sant Longowal Institute of Engineering and Technology, Longowal, 148 106, Punjab, India;1. Department of Environmental Science and Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing, 100083, China;2. Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing, 100083, China;1. EPIUnit – Instituto de Saúde Pública, Universidade do Porto, Portugal;2. Departamento de Comunicação e Artes, Universidade de Aveiro, Portugal;3. Centre for Health Equity, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia;4. Departamento de Ciências da Saúde Pública e Forenses e Educação Médica, Faculdade de Medicina, Universidade do Porto, Porto, Portugal;1. Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC), Valencia, Spain;2. Department of Agricultural Economics, Statistics and Business Management, Universidad Politécnica de Madrid, Madrid, Spain |
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| Abstract: | (Liquid + liquid) equilibria (LLE) of the {poly ethylene glycol di-methyl ether 2000 (PEGDME2000) + tri-potassium citrate + H2O} system have been determined experimentally at T = (298.15, 303.15, 308.15, and 318.15) K. The effect of temperature on the binodals and tie-lines for the investigated aqueous two-phase system (ATPS) has also been studied. In this work, the three fitting parameters of the Merchuk equation and an empirical equation that we proposed in our previous work were obtained with the temperature dependence expressed in the linear form with (T − T0) K as a variable. Furthermore, the Othmer–Tobias and Bancroft, a temperature dependent Setschenow-type equation and osmotic virial model, the segment-based local composition models (the extended NRTL and the modified NRTL) were used for the correlation and prediction of the liquid–liquid phase behavior of the system studied. In addition, the effect of the polymers PEGDME2000 and poly ethylene glycol 2000 on the phase forming ability were studied. Also, the free energies of cloud points for this system were calculated from which it was concluded that the increase of the entropy is driving force for formation of studied aqueous two-phase system. |
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