Selectivity in extraction

O. Winkler and R. Bakish (ed.), Vacuum Metallurgy, Elsevier, Amsterdam, 1971. P. C. Hayes, Process Selection in Extractive Metallurgy, Hayes Publishing Co., Brisbane, 1985. 

Selectivity in extraction can be defined as the ability to extract only the analyte(s) of interest, while leaving... 

Li S and Hartland S. 1992. Influence of cosolvents on solubility and selectivity in extraction of xanthines and cocoa butter from cocoa beans with supercritical carbon CO2. J Supercrit Fluids 5 7-12. 

The cation selectivity in extraction experiments is dependent on differences in both the distribution constants KD and the binding constants Klf) in the water-saturated organic solvent (3). The extractability of alkali cations into... 

Choudhary, S. Morrow, J. R. Dynamic acylhydrazone metal ion complex libraries A mixed-ligand approach to increased selectivity in extraction. Angew. Chem. Int. Ed. 2002, 41, 4096-4098. 

Activity coefficients at infinite dilution, of organic solutes in ILs have been reported in the literature during the last years very often [1,2,12,45,64, 65,106,123,144,174-189]. In most cases, a special technique based on the gas chromatographic determination of the solute retention time in a packed column filled with the IL as a stationary phase has been used [45,123,174-176,179,181-187]. An alternative method is the "dilutor technique" [64,65,106, 178,180]. A lot of y 3 (where 1 refers to the solute, i.e., the organic solvent, and 3 to the solvent, i.e., the IL) provide a useful tool for solvent selection in extractive distillation or solvent extraction processes. It is sufficient to know the separation factor of the components to be separated at infinite dilution to determine the applicability of a compound (a new IL) as a selective solvent. 

Parent resorcin[4]arenes also show Cs selectivity in extraction from alkaline media (pH 12), for example, into benzene.24 With long alkyl chains appended to the bridging carbon atom, separation by flotation is possible. 

PRINCIPLES OF SOLVENT EXTRACTION OF ALKALI METAL IONS UNDERSTANDING FACTORS LEADING TO CESIUM SELECTIVITY IN EXTRACTION BY SOLVATION Bruce A. Moyer and Yunfu Sun... 

Li, S. and Hartland, S. Influences of co-solvents on solubility and selectivity in extraction of xanthine stimulants and cacao butter from cacao beans with supercritical C02, 2nd International Symposium on Supercritical Fluids, Boston 1991... 

Fig. 4.10. Supramolecular extractants 4, 5 and 6 showing peak selectivity in extraction.

Selectivity in Extraction by Amine-Based Extractants (T(OD)A in Kerosene)... 

Table 5 Selectivity in Extraction from Concentrated HCl + H P04 Solutions...

The excellent combination of efficiency, reversibility, and selectivity in extraction by ABC extractants provides for saving on capital cost. In many cases, stoichiometric extraction results in about 1 mole of extracted acid per mole of amine in the loaded extractant (organic-to-aqueous volume ratio of about 3 in treating an effluent comprising 30% free sulfuric acid). Well-adjusted distribution curves achieve nearly complete extraction and a quite concentrated back-extract by three or four theoretical stages in extraction and a similar number of theoretical stages in back-extraction. Phase mixing and phase separation are satisfactory too. 

Table 10 Selectivities in Extraction from Solutions Comprising H3PO4 + H2SO4 + H2SiFe...

Understanding Factors Leading to Cesium Selectivity in Extraction by Solvation... 

Selectivity in extraction procedures is the degree to which solutes in a mixture can be separated by virtue of having different distribution ratios. For... 

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