Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/21497
Tipo: Artigo
Título: Liquid–liquid equilibrium of aqueous two-phase systems composed of poly(ethylene oxide) 1500 and different electrolytes ((NH4 )2SO4 , ZnSO4 and K2HPO4 ): experimental and correlation
Autor(es): Lemos, Leandro Rodrigues de
Patrício, Pamela da Rocha
Rodrigues, Guilherme Dias
Carvalho, Raquel Moreira Maduro de
Silva, Maria C. Hespanhol da
Silva, Luis Henrique Mendes da
Abstract: Phase diagrams of aqueous two-phase systems composed of PEO1500 + salt (di-potassium phosphate + potassium hydroxide or ammonium sulfate or zinc sulfate) + water were determined at (283.15, 298.15, and 313.15) K. All systems produce a large two-phase region; however the influence of temperature on the binodal position seems to be very small. By analyzing the effects of ammonium sulfate or zinc sulfate, it was observed that zinc was more effective in promoting phase separation than ammonium. The consistency of the tie-line data was ascertained by applying the Othmer–Tobias correlation. In this paper, aqueous two-phase systems data for nine ternary systems are correlated by using the NRTL model and UNIFAC for the activity coefficient. The results are very satisfactory, with root mean square deviations between experimental and calculated compositions as low as 0.99 and 1.21%, respectively. However the NRTL model better represents the systems in study, when compared with UNIFAC.
Palavras-chave: Aqueous two-phase systems
Poly(ethylene oxide)
Liquid–liquid extraction
NRTL
UNIFAC
Editor: Fluid Phase Equilibria
Tipo de Acesso: Elsevier B.V.
URI: https://doi.org/10.1016/j.fluid.2011.03.001
http://www.locus.ufv.br/handle/123456789/21497
Data do documento: 15-Jun-2011
Aparece nas coleções:Artigos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
artigo.pdf
  Until 2100-12-31
texto completo376,2 kBAdobe PDFVisualizar/Abrir ACESSO RESTRITO


Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.