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Brazilian Journal of Chemical Engineering

versão impressa ISSN 0104-6632versão On-line ISSN 1678-4383

Resumo

SE, R.A.G.  e  AZNAR, M.. Thermodynamic modelling of phase equilibrium for water + poly(Ethylene glycol) + salt aqueous two-phase systems. Braz. J. Chem. Eng. [online]. 2002, vol.19, n.2, pp.255-266. ISSN 0104-6632.  http://dx.doi.org/10.1590/S0104-66322002000200006.

The NRTL (nonrandom, two-liquid) model, expressed in mass fraction instead of mole fraction, was used to correlate liquid-liquid equilibria for aqueous two-phase polymer-salt solutions. New interaction energy parameters for this model were determined using reported data on the water + poly(ethylene glycol) + salt systems, with different molecular masses for PEG and the salts potassium phosphate, sodium sulfate, sodium carbonate and magnesium sulfate. The correlation of liquid-liquid equilibrium is quite satisfactory.

Palavras-chave : aqueous two-phase systems; liquid-liquid equilibrium; polymers; salts; NRTL model.

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