Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/81269
Type: Artigo de periódico
Title: Liquid-Liquid Equilibrium of Aqueous Two-Phase System Composed of Poly(ethylene glycol) 400 and Sulfate Salts
Author: Martins, JP
Coimbra, JSD
de Oliveira, FC
Sanaiotti, G
da Silva, CAS
da Silva, LHM
da Silva, MDH
Abstract: Phase diagrams of aqueous two-phase systems (ATPS) composed of 400 g.mol(-1) poly(ethylene glycol) (PEG) + sodium sulfate or magnesium sulfate were determined at (298.15, 308.15, and 318.15) K. The temperature effect oil the biphasic area was not relevant, indicating a small enthalpic contribution associated with the phase separation. The ability of the salts in inducing the formation of the ATPS with PEG 400 followed the order sodium sulfate < magnesium sulfate. The liquid-liquid equilibrium experimental data were correlated using the NRTL (nonrandom two-liquid) activity Coefficient Model, and new interaction parameters were estimated. The mean deviations between calculated and experimental compositions were lower than 0.99 %, showing the good descriptive quality and applicability of the NRTL model.
Country: EUA
Editor: Amer Chemical Soc
Rights: fechado
Identifier DOI: 10.1021/je9006162
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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