Kinetics and mechanism of the interfacial mass transfer of Zn/sup 2 +/, Co/sup 2 +/ and Ni/sup 2 +/ in the system: bis(2-ethylhexyl)phosphoric acid, n-dodecane - KNO/sub 3/, water
The mass transfer rate of Zn(II), Co(II) and Ni(II) between aqueous nitrate solutions and n-dodecane solutions of the organic soluble ligand HDEHP has been investigated using a forced convection, constant interfacial area stirred cell. The distribution ratios necessary to evaluate the kinetic experiments have been determined and the equilibrium constants which describe the heterogeneous complex formation reaction between Zn/sup 2 +/, Co/sup 2 +/, Ni/sup 2 +/ and HDEHP have been evaluated. The results have been interpreted according to two limiting models: 1) the mass transfer rate is controlled by slow reversible interfacial reactions, 2) the mass transfer is controlled by interfacial film diffusion. Both models are adequate to interpret the experimental data. The conclusion is reached that, if interfacial chemical reactions are rate controlling, rate constants of interfacial complex formation reactions independent of the nature of the cation are obtained. This result supports a reaction mechanism which is rate controlled by the microscopic diffusion of the cation through a viscous and structured layer of interfacial water adjacent to the liquid interface. 17 references, 7 figures, 1 table.
- Research Organization:
- Argonne National Lab., IL
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 6243158
- Journal Information:
- Solvent Extr. Ion Exch.; (United States), Vol. 1:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COBALT
SOLVENT EXTRACTION
NICKEL
ZINC
AQUEOUS SOLUTIONS
CHEMICAL REACTION KINETICS
COBALT 60
CORRELATIONS
DIFFUSION
DODECANE
EQUILIBRIUM
EXPERIMENTAL DATA
HDEHP
MASS TRANSFER
MATHEMATICAL MODELS
NICKEL 63
NUMERICAL ANALYSIS
POTASSIUM NITRATES
SCINTILLATION COUNTING
TRACER TECHNIQUES
ZINC 65
ALKALI METAL COMPOUNDS
ALKANES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
COBALT ISOTOPES
COUNTING TECHNIQUES
DATA
DAYS LIVING RADIOISOTOPES
DISPERSIONS
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
ESTERS
EVEN-ODD NUCLEI
EXTRACTION
HYDROCARBONS
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
MATHEMATICS
METALS
MINUTES LIVING RADIOISOTOPES
MIXTURES
NICKEL ISOTOPES
NITRATES
NITROGEN COMPOUNDS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORIC ACID ESTERS
POTASSIUM COMPOUNDS
RADIOISOTOPES
REACTION KINETICS
SEPARATION PROCESSES
SOLUTIONS
TRANSITION ELEMENTS
YEARS LIVING RADIOISOTOPES
ZINC ISOTOPES
400105* - Separation Procedures
400201 - Chemical & Physicochemical Properties
400301 - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)