The thermodynamics of extraction equilibria

Ruvarac, A.; Maksimovic, Z.; Halasi, R.

doi:10.1007/bf02520846

Cited by 5 publications

(1 citation statement)

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“…Hydrous zirconia is the best choice for studies in mixed solvents since it is the hydrous oxide most widely studied in the aqueous medium. [8][9][10][11] With regard to previous studies on the ion-exchange behaviour of hydrous oxides in mixed solvents, the work hitherto reported in the literature is rather scanty and inconclusive.12-14 A thorough study of the ion-exchange behaviour of hydrous zirconia in aqueous/organic solvent media, including kinetic and thermodynamic investigations, has been carried out in this laboratory. The present paper deals with measurements of the capacity of hydrous zirconia in aqueous/methanolic mixtures and with its kinetic behaviour in aqueous/methanolic, aqueous/ethanolic and aqueous/propan-2olic solutions.…”

Section: Introductionmentioning

confidence: 99%

Ion‐exchange behaviour of hydrous zirconia in mixed solvents: Capacity and kinetics of exchange

Misak

Ghoneimy

1982

J. Chem. Technol. Biotechnol.

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The capacity of the Li+ form of hydrous zirconia for Na+ and Cs+ increases in the presence of methanol. This may be due to the greater stability of Lit in methanol/water than in pure water and to dehydration of Na+ and Cs i-and their stronger interaction with the exchange sites, which may facilitate their replacing Li+. The ion-exchange capacity of zirconia for NOa-, C1-and Bris almost the same in aqueous solution and is not affected by addition of up toW%(v/v)methanol, which probably shows that these anions are electrostatically bound in zirconia without specific interactions. The internal diffusion coefficients of the Na+/H+ and CI-/OHsystems decrease in the presence of alcohol: the decrease is highest with methanol and similar for ethanol and propan-2-01. This is discussed in the light of ion solvation and alcohol penetration inside zirconia.

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Section: Introductionmentioning

confidence: 99%

Ion‐exchange behaviour of hydrous zirconia in mixed solvents: Capacity and kinetics of exchange

Misak

Ghoneimy

1982

J. Chem. Technol. Biotechnol.

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Extraction of nickel with dihexyl phosphinic acid and study of Ni(II)‐saccharate complexes

Benéitez

Millán

1989

Ber Bunsenges Phys Chem

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The equilibrium extraction behavior for nickel(II) using a kerosene (Shellsol‐T) solution containing dihexyl‐phosphinic acid is studied. From experimental data, treated by a graphical method, monomeric Ni(DHP)2(HDHP)2 and dimeric (Ni(DHP)2(HDHP)2)2 species are found responsible for the extraction. Constants for the extraction equilibrium have been determined as: log K12 = −11.45 and log K22 = −18.81. Constant for monomer‐dimer equilibrium of nickel species is given as: log K = 4.10. —In presence of ligand, saccharate, is concluded to exist in the aqueous phase a nickel(II)‐saccharate complex (1:1) with a stability constant of 3.46 · 103 and general formula C6H8O8Ni · 3H2O.

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