Premium
Equilibrium characteristics for the extraction of cobalt and nickel into di(2‐ethylhexyl) phosphoric acid
Author(s) -
Golding J. A.,
Barclay C. D.
Publication year - 1988
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450660612
Subject(s) - phosphoric acid , cobalt , nickel , extraction (chemistry) , aqueous solution , chemistry , liquid–liquid extraction , solvent , aqueous two phase system , phase (matter) , inorganic chemistry , solvent extraction , phosphate , chromatography , organic chemistry
The liquid‐liquid extraction of cobalt and nickel from aqueous sulphate solutions into di(2‐ethylhexyl) phosphoric acid, DZEHPA, has been investigated at 25°C and 60°C. The system studied was made up as follows: the aqueous phase‐cobalt and nickel dphates; the organic phase‐20% D2EHPA, 75% Esso solvent DX3641 and 5% tri‐butyl phosphate. Analogies to vapour‐liquid equilibria were made to develop three methods to correlate the binary equilibrium data, namely: 1) a delta Y method, 2) a method based on the correlation of solvent free mole fractions in both phases and 3) a “pseudo activity” coefficient or pseudo gamma method, γ AB . The methods were evaluated as to their suitability for the prediction of binary isotherms. The delta Y and pseudo gamma methods were found to give the best results.