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Chemically based models to predict distribution coefficients in the copper (II) and zinc (II) chloride-tri-n-octylamine extraction systems

Technical Report ·
DOI:https://doi.org/10.2172/6605370· OSTI ID:6605370
The fundamental chemistry of copper (III) and zinc (II) chloride extraction by the extractant tri-n-octylamine is reviewed. The chemically based model is derived for both the single systems and the binary system. The predictive model makes use of the aqueous phase metal chloride complexes' stability constants, their extraction mechanism, and the equilibrium constant for the extraction reaction. The distribution coefficient of copper and zinc can be predicted by the equation D = K/sub 1/..cap alpha../sub 0/phi/sup 2/, where phi is the product of the equilibrated organic concentration and the chloride ion concentration in the aqueous phase, K/sub 1/, is the effective equilibrium constant containing the quotient of the activity coefficients of the reacting species and ..cap alpha../sub 0/ is the degree of formation of the free metal ion in the equilibrated aqueous phase. Excellent agreement between the experimental data and the predicted values was obtained. The multicomponent, binary metal extraction is examined in a quantitative manner. The separation factor can be predicted by the equation S/sub M,N/ = K/sub 1/'((..cap alpha../sub 0/)M/(..cap alpha../sub 0/)N). This model was based on the assumption that the activity coefficient varies slightly with its concentration. The experimental results show that the data fit the binary model very well. The suppression of copper extraction in the presence of zinc was noticed.
Research Organization:
Ames Lab., IA (USA)
DOE Contract Number:
W-7405-ENG-82
OSTI ID:
6605370
Report Number(s):
IS-T-938
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
AMINES
CHELATING AGENTS
CHLORIDES
CHLORINE COMPOUNDS
COPPER
COPPER CHLORIDES
COPPER COMPOUNDS
COPPER HALIDES
DISTRIBUTION FUNCTIONS
ELEMENTS
EXTRACTION
FUNCTIONS
HALIDES
HALOGEN COMPOUNDS
KINETICS
MATHEMATICAL MODELS
METALS
ORGANIC COMPOUNDS
PARTICLE MODELS
REACTION KINETICS
SEPARATION PROCESSES
SOLVENT EXTRACTION
STATISTICAL MODELS
THERMODYNAMIC ACTIVITY
THERMODYNAMIC MODEL
TOA
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC
ZINC CHLORIDES
ZINC COMPOUNDS
ZINC HALIDES