Solvent Extraction of p-Nitrophenol into Cyclohexane with Phosphines and Their Derivatives

Hirochika NAGANAWA; Haruaki MATSUURA; Yasushi OGIHARA; Satoshi KUSAKABE; Tatsuya SEKINE

doi:10.2116/analsci.6.287

Hirochika NAGANAWA, Haruaki MATSUURA, Yasushi OGIHARA, Satoshi KUSAKABE, Tatsuya SEKINE

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Keywords: Solvent extraction, p-nitrophenol, trioctylamine, trioctylphosphine, trioctylphosphine oxide, triphenylphosphine, triphenylphosphine oxide, triphenylphosphine sulfide, acid-base association, nonaqueous solvent, hydrogen-bonded complex

JOURNAL FREE ACCESS

1990 Volume 6 Issue 2 Pages 287-289

DOI https://doi.org/10.2116/analsci.6.287

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Abstract

The solvent extraction of p-nitrophenol from aqueous acid solutions into cyclohexane with trioctylphosphine (TOP), trioctylphosphine oxide (TOPO), triphenylphosphine (TPP), triphenylphosphine oxide (TPPO) and triphenylphosphine sulfide (TPPS) was examined. The results were compared with those with trioctylamine (TOA). The extracted p-nitrophenol was found to form a 1:1 hydrogen-bonded associate with bases in the organic phase. The association
constant in the organic phase was greater in the order TOPO>TPPO>TOP>TOA>TPPS>TPP. The ability of an extractant for an acid is considered from its chemical properties as a base in the organic phase. It was concluded that it may be related to the association constant with the acid in the solvent.

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