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https://locus.ufv.br//handle/123456789/21771
Tipo: | Artigo |
Título: | Phase equilibrium of aqueous two-phase systems composed by L35 triblock copolymer + organic and inorganic ammonium electrolytes + water at 298.2 and 313.2 K |
Autor(es): | Veloso, Anne C. G. Patrício, amela R. Quintão, Juan C. Carvalho, Raquel M. M. de Silva, Luis H. M. da Hespanhol, Maria C. |
Abstract: | Liquid-liquid equilibrium data of aqueous two-phase systems (ATPS) composed by L35 triblock copolymer + ammonium electrolytes (nitrate, NO3−; tartrate, C4H4O62−; phosphate, HPO42−; acetate, C2H3O2−) + water, at different temperatures (298.2 and 313.2 K) are presented in this paper. The experimental ATPS data were correlated with the original and modified non-random two-liquid (NRTL) for predicting energetic parameters of the studied systems. The results were satisfactory with global root mean square deviations (33 tie-lines) of the 2.36% and 2.53% for the original and modified models, respectively. The effect of the temperature and electrolyte nature on the biphasic area position was investigated. The increase of the temperature promoted a slight increase in the two-phase region indicating the endothermic character of the phase splitting. The increase in the temperature also promoted a rise in the module of the slope of the tie-lines. The anions ability to promote phase separation followed the order: HPO42− > C4H4O62− > NO3− > C2H3O2−. |
Palavras-chave: | Aqueous two-phase systems Liquid-liquid equilibrium Ammonium salts L35 NRTL |
Editor: | Fluid Phase Equilibria |
Tipo de Acesso: | Elsevier B.V. |
URI: | https://doi.org/10.1016/j.fluid.2018.04.017 http://www.locus.ufv.br/handle/123456789/21771 |
Data do documento: | 15-Ago-2018 |
Aparece nas coleções: | Artigos |
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artigo.pdf Until 2100-12-31 | texto completo | 581,56 kB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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