Extraction Equilibria of Organic Acids with Tri-n-Octylphosphineoxide

Tadashi Hano; Michiaki Matsumoto; Takaaki Ohtake; Kiyotaka Sasaki; Fumiaki Hori; Yoshinobu Kawano

doi:10.1252/jcej.23.734

Tadashi Hano, Michiaki Matsumoto, Takaaki Ohtake, Kiyotaka Sasaki, Fumiaki Hori, Yoshinobu Kawano

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Keywords: Extraction, Organic Acid, Equilibrium, Trioctylphosphineoxide

JOURNAL FREE ACCESS

1990 Volume 23 Issue 6 Pages 734-738

DOI https://doi.org/10.1252/jcej.23.734

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Abstract

The extraction equilibrium of organic acids (acetic, glycolic, propionic, lactic, pyruvic, butyric, succinic, fumaric, maleic, malic, itaconic, tartaric, citric and isocitric) with tri-n-octylphosphine oxide (TOPO) was measured. The solvation numbers of the acids were the same as the numbers of the carboxyl groups on each acid molecule. The extraction equilibrium constant was controlled by the hydrophobicity of the acid when hexane was used as a diluent.

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