A kinetic model for the extraction of nitric acid by tri-n-butylphosphate

Solvent Extraction and Stripping Studies in Microchannels with TBP Nitric Acid System

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Solvent Extraction and Stripping Studies in Microchannels with TBP Nitric Acid System

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Kinetics of extraction of nitric acid into binary mixture of tri-n-butyl phosphate and normal paraffin hydrocarbon

“…However, in this respect there exists a conflict, typical for liquid-liquid phase. Lawson and Hughes (1989) derived their kinetic model on the assumption that extraction reaction between nitric acid and the extractant occurred in the aqueous phase and the reaction zone extended into the aqueous diffusion layer. There is no agreement in the literature over the method or arguments suitable for determining the locale of the reaction plane.…”

“…They stated that, the reaction between nitric acid and tri-butyl phosphate occurs instantaneously in a very thin reaction zone located at the interface and the transfer process is greatly enhanced by interfacial turbulence. Lawson and Hughes (1989) developed a kinetic model assuming irreversible reaction for the extraction of nitric acid by TBP in kerosene. The rotating diffusion cell was used for the measurement of the initial rate of mass transfer of nitric acid into TBP-kerosene mixture.…”

Equilibrium Study for the System Tri-n-butyl Phosphate, Normal Paraffin Hydrocarbon, and Nitric Acid

“…The distribution coefficient of nitrous acid has been measured as a function of the nitrous and nitric acid concentrations in the aqueous phase and functions of TBP and uranium concentrations in the organic phase by Uchiyama et al The solubility of TBP in plutonium nitrate solution and in highly radioactive liquid waste (HRLW) of the PUREX process has been determined by Kuno et al, and the variation in solubility of TBP with the concentration of nitric acid and temperature has also been studied. Lawson and Hughes have designed a kinetic model for extraction of nitric acid by TBP and have found that the extraction is controlled by a combination of diffusion and chemical kinetic processes. Baldwin and Higgins have extracted TBP using various diluents and determined the distribution coefficient of TBP in solvents having lower miscibility.…”

Solvent Extraction and Stripping Studies in Microchannels with TBP Nitric Acid System

“……”

Kinetics of extraction of nitric acid into binary mixture of tri-n-butyl phosphate and normal paraffin hydrocarbon

“…However, in this respect there exists a conflict, typical for liquid-liquid phase. Lawson and Hughes (1989) derived their kinetic model on the assumption that extraction reaction between nitric acid and the extractant occurred in the aqueous phase and the reaction zone extended into the aqueous diffusion layer. There is no agreement in the literature over the method or arguments suitable for determining the locale of the reaction plane.…”

“…They stated that, the reaction between nitric acid and tri-butyl phosphate occurs instantaneously in a very thin reaction zone located at the interface and the transfer process is greatly enhanced by interfacial turbulence. Lawson and Hughes (1989) developed a kinetic model assuming irreversible reaction for the extraction of nitric acid by TBP in kerosene. The rotating diffusion cell was used for the measurement of the initial rate of mass transfer of nitric acid into TBP-kerosene mixture.…”

Equilibrium Study for the System Tri-n-butyl Phosphate, Normal Paraffin Hydrocarbon, and Nitric Acid

“…The distribution coefficient of nitrous acid has been measured as a function of the nitrous and nitric acid concentrations in the aqueous phase and functions of TBP and uranium concentrations in the organic phase by Uchiyama et al The solubility of TBP in plutonium nitrate solution and in highly radioactive liquid waste (HRLW) of the PUREX process has been determined by Kuno et al, and the variation in solubility of TBP with the concentration of nitric acid and temperature has also been studied. Lawson and Hughes have designed a kinetic model for extraction of nitric acid by TBP and have found that the extraction is controlled by a combination of diffusion and chemical kinetic processes. Baldwin and Higgins have extracted TBP using various diluents and determined the distribution coefficient of TBP in solvents having lower miscibility.…”

Solvent Extraction and Stripping Studies in Microchannels with TBP Nitric Acid System

“……”

Kinetics of extraction of nitric acid into binary mixture of tri-n-butyl phosphate and normal paraffin hydrocarbon

“…However, in this respect there exists a conflict, typical for liquid-liquid phase. Lawson and Hughes (1989) derived their kinetic model on the assumption that extraction reaction between nitric acid and the extractant occurred in the aqueous phase and the reaction zone extended into the aqueous diffusion layer. There is no agreement in the literature over the method or arguments suitable for determining the locale of the reaction plane.…”

“…They stated that, the reaction between nitric acid and tri-butyl phosphate occurs instantaneously in a very thin reaction zone located at the interface and the transfer process is greatly enhanced by interfacial turbulence. Lawson and Hughes (1989) developed a kinetic model assuming irreversible reaction for the extraction of nitric acid by TBP in kerosene. The rotating diffusion cell was used for the measurement of the initial rate of mass transfer of nitric acid into TBP-kerosene mixture.…”

Equilibrium Study for the System Tri-n-butyl Phosphate, Normal Paraffin Hydrocarbon, and Nitric Acid

“…The distribution coefficient of nitrous acid has been measured as a function of the nitrous and nitric acid concentrations in the aqueous phase and functions of TBP and uranium concentrations in the organic phase by Uchiyama et al The solubility of TBP in plutonium nitrate solution and in highly radioactive liquid waste (HRLW) of the PUREX process has been determined by Kuno et al, and the variation in solubility of TBP with the concentration of nitric acid and temperature has also been studied. Lawson and Hughes have designed a kinetic model for extraction of nitric acid by TBP and have found that the extraction is controlled by a combination of diffusion and chemical kinetic processes. Baldwin and Higgins have extracted TBP using various diluents and determined the distribution coefficient of TBP in solvents having lower miscibility.…”