Diffusion in the system water + tri-n-butyl phosphate. Effect of aqueous electrolytes, and of organic phase water concentration

Abstract

The interfacial permeability coefficient k for the transfer of water across the waterltri-n-butyl phosphate (TBP) interface has been determined as a function both of aqueous electrolyte Concentration, and of the initial water concentration 31 the TBP. The diffusion coefficient D of water in the organic phase has also been measured. Both k and D are found to be independent of electrolyte concentration over the range 0-1 m d aqueous NaCI, and for 1.25 mol dm-j aqueous Cr(N03)3. The coefficient D is dependent on the initial water concentration in the TBP phase, with a maximum value at a TBP/H20 mole ratio m2. The results are discussed in terms of possible diffusion mech-aniSmS.

Extraction Studies of Phosphoric Acid Tributyl Ester from Nitric Acid Solutions Using Dodecane in the Presence of Inextractable Metal Nitrates

“…15 Hipfner and Tuck have determined the interfacial permeability coefficient k for the transfer of water across the water/TBP interface as a function of both the aqueous electrolyte concentration and the initial water concentration in the TBP. 16 All of these above authors have mainly focused on the solubility of TBP in water or in the presence of metal nitrate in water. However, literature on the separation of TBP from aqueous nitric acid solution in the presence of different inextractable metal nitrates is not available.…”

“…Kumar et al have proposed an extended Setschenow model for the predicting the solubility of water in (5 to 100) % TBP/diluent/nitric acid/water biphasic system at 298.15 K and also the temperature dependency on the solubility . Hipfner and Tuck have determined the interfacial permeability coefficient k for the transfer of water across the water/TBP interface as a function of both the aqueous electrolyte concentration and the initial water concentration in the TBP . All of these above authors have mainly focused on the solubility of TBP in water or in the presence of metal nitrate in water.…”