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

• Published in: Analytical Sciences Vol. 6; no. 2; pp. 287 - 289
• Main Authors: NAGANAWA, Hirochika, MATSUURA, Haruaki, OGIHARA, Yasushi, KUSAKABE, Satoshi, SEKINE, Tatsuya
• Format: Journal Article
• Language: English
• Published: Tokyo The Japan Society for Analytical Chemistry 01.04.1990; Japan Society for Analytical Chemistry; Japan Science and Technology Agency
• Subjects: acid-base association; Chemistry; Exact sciences and technology; General and physical chemistry; hydrogen-bonded complex; nonaqueous solvent; Others (including liquid-liquid-vapor equilibria); p-nitrophenol; Phase equilibria; Solvent extraction; trioctylamine; trioctylphosphine; trioctylphosphine oxide; triphenylphosphine; triphenylphosphine oxide; triphenylphosphine sulfide; Phosphine; Cyclohexane; Association constant; Extraction; Aqueous solution; Non aqueous solvent; Solvent; Hydrogen bond
• ISSN: 0910-6340; 1348-2246
• DOI: 10.2116/analsci.6.287

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.