HOMOGENEOUS LIQUID-LIQUID EXTRACTION.
Item
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Title
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HOMOGENEOUS LIQUID-LIQUID EXTRACTION.
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Identifier
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AAI8023709
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identifier
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8023709
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Creator
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HONG, CHIA-SWEE.
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Contributor
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Harmon L. Finston
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Date
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1980
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Language
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English
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Publisher
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City University of New York.
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Subject
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Chemistry, Analytical
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Abstract
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Solvent or liquid-liquid extraction is based on the principle that a solute will distribute itself in a certain ration between two immiscible solvents, one of which is usually water and the other an organic solvent such as benzene, carbon tetrachloride or chloroform. In certain cases the initially aqueous solute is quantitatively transferred to the organic phase. The technique can be used for purposes of preparation, purification, enrichment, separation and analysis, on all scales of working from microanalysis to production processes.;Some problems do, however, remain in solvent extraction, e.g., slow extraction rates and incomplete extractions. A new homogeneous liquid-liquid extraction method using propylene carbonate has been developed, which is characterized by immediate formation of the complex upon achieving a single homogeneous liquid phase at elevated temperature. Two distinct phases appear upon cooling to room temperature. This method was applied to the extraction of a number of metal ions such as Fe(III), Cu(II), Ni(II), Pb(II) and Zn(II) from aqueous solution into propylene carbonate. The extraction behavior of both monodentate and bidentate complexes were investigated and compared with the usual liquid-liquid extractions. Butylene carbonate, an analogue of propylene carbonate, was also studied as an extractant. Atomic absorption was applied to the analyses of both organic and aqueous phases by direct comparison with the standards.;We have demonstrated some potentialities of homogenous liquid-liquid extraction, and believe that this idea might be advantageously applied to problems in separation chemistry for which the conventional solvent extraction procedure is inadequate.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Chemistry
