Reactive Extraction of o-Aminophenol with Di(2-ethylhexyl)phosphoric Acid in Different Diluents

Di(2-ethylhexyl)phosphoric acid was used as a reagent for the extraction of o-aminophenol in 2-octanol and kerosene. Equilibrium data for active and inactive diluents were obtained at various di(2-ethylhexyl)phosphoric acid concentrations. Both neutral and positive forms of o-aminophenol could be ex...

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Bibliographic Details
Published in:Journal of chemical and engineering data 2007-05, Vol.52 (3), p.671-675
Main Authors: Cui, Jie-Hu, Li, De-Liang
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
Liquid-liquid extraction
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Summary:Di(2-ethylhexyl)phosphoric acid was used as a reagent for the extraction of o-aminophenol in 2-octanol and kerosene. Equilibrium data for active and inactive diluents were obtained at various di(2-ethylhexyl)phosphoric acid concentrations. Both neutral and positive forms of o-aminophenol could be extracted by di(2-ethylhexyl)phosphoric acid. The maximum distribution coefficient occurred when the initial pH value was between pK a1 and pK a2, the dissociation constants of o-aminophenol. At the same concentration the extractabilitiy of di(2-ethylhexyl)phosphoric acid increased as the polarity of the diluent increased. The difference of the distribution coefficient between polar diluents and nonpolar diluents decreased with an increase in the di(2-ethylhexyl)phosphoric acid concentration. Fourier transform infrared spectroscopic analysis was used to show that the behavior is controlled by ion association and ion exchange reactions.
ISSN:0021-9568
1520-5134
DOI:10.1021/je0601412