Phase diagram and thermodynamic modeling of PEO + organic salts + H2O and PPO + organic salts + H2O aqueous two-phase systems

dc.creatorPatrício, Pamela da Rocha
dc.creatorMageste, Aparecida Barbosa
dc.creatorLemos, Leandro Rodrigues de
dc.creatorCarvalho, Raquel Moreira Maduro de
dc.creatorSilva, Luis Henrique Mendes da
dc.creatorSilva, Maria C. Hespanhol da
dc.date2018-08-28T16:30:55Z
dc.date2018-08-28T16:30:55Z
dc.date2015-06-15
dc.date.accessioned2023-09-27T21:35:28Z
dc.date.available2023-09-27T21:35:28Z
dc.identifier03783812
dc.identifierhttps://doi.org/10.1016/j.fluid.2011.02.013
dc.identifierhttp://www.locus.ufv.br/handle/123456789/21486
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8963118
dc.descriptionThe phase diagrams of PEO1500 + sodium tartrate + water, PPO400 + sodium tartrate + water, PEO1500 + sodium succinate + water, PPO400 + sodium succinate + water, PEO1500 + sodium citrate + water, PPO400 + sodium citrate + water and PPO400 + sodium acetate + water aqueous two-phase systems were determined at (283.15, 298.15, and 313.15) K. Both equilibrium phases composition were analyzed by conductimetry and refractive index. In this paper, the influences of polymer hydrophobicity, salt nature and temperature on the phase diagram were analyzed. The phase separation processes was endothermic and the hydrophobic increase make easier the phase splitting, while the electrolyte capacity to induce phase separation follow the order: citrate > tartrate > succinate. The consistency of the tie-line data was ascertained by applying the Othmer–Tobias correlation. The experimental data were correlated with the NRTL model for the activity coefficient, with estimation of new interaction energy parameters. The results, analyzed in terms of root mean square deviations between experimental and calculated compositions, were considered satisfactory.
dc.formatElsevier B.V.
dc.formatapplication/pdf
dc.languageeng
dc.publisherFluid Phase Equilibria
dc.relationv. 305, n. 1, p. 1- 8, jun. 2011
dc.rightsElsevier B.V.
dc.subjectAqueous two-phase systems
dc.subjectPoly(ethylene oxide)
dc.subjectPoly(propylene oxide)
dc.subjectNRTL model
dc.titlePhase diagram and thermodynamic modeling of PEO + organic salts + H2O and PPO + organic salts + H2O aqueous two-phase systems
dc.typeArtigo


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