Synergistic Extraction of Organic Acids with Tri-n-Octylamine and Di-2-Ethylhexylphosphoric Acid

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Yasuyuki Kawamura¹  Michiaki Matsumoto¹  Kazuo Kondo¹ 

[1] Department of Chemical Engineering and Materials Science, Faculty of Engineering, Doshisha University

关键词: Synergism;    Extraction;    Organic Acids;    Tri-n-Octylamine;    Di-2-Ethylhexylphosphoric Acid;   

DOI  :  10.1252/jcej.37.1150

来源: Maruzen Company Ltd

【 摘 要 】

References(14)Cited-By(3)The equilibria of organic acids (acetic, glycolic, propionic, lactic, butyric, pyruvic, tartaric, succinic, fumaric, L-malic, itaconic and citric, HA) extracted with tri-n-octylamine (TOA) and di-2-ethylhexylphosphoric acid (D2EHPA, HR) were measured. Synergism was observed in the extraction of all acids investigated when a mixed extractant of TOA and D2EHPA was used, while the extraction ability of TOA or D2EHPA alone was negligible under the experimental conditions. In the synergistic system, the distribution ratio of the acids plotted against the D2EHPA concentration showed a bell shape. FT-IR spectrum of the mixed extractant suggested that TOA and D2EHPA interacted. From these results, we estimated that TOA·HR and TOA·(HR)2 were the active and inactive species for the acid extraction, respectively, and that the extracted species was HA·TOA·HR. The calculated distribution ratios of organic acids showed good agreement with the experimental results. The obtained synergistic extraction equilibrium constants roughly correlated with the hydrophobicity of each acid.

【 授权许可】

Unknown