Extraction Equilibria of Amino Acids with Di-(2-ethylhexyl)phosphoric Acid

Abstract

Abstract: The extraction equilibria of various amino acids with di-(2-ethylhexyl)phosphoric acid(P₂₀₄) were studied in the lower pHrange.P₂₀₄ reacts with the cations of amino acids according to the stoichiometric ratio determined by ionic valency.For monovalent cations, the reaction forming complex can be expressed as follows: A⁺ + 2(HL)₂＝AL(HL)₃ + H⁺ The values of extraction equibibrium constant K_ex of several amino acids were obtained.The effects of some parameters on the distribution ratio of amino acids were also studied.

Key words: Amino acid, Di-(2-ethylhexyl) phosphoric acid, Extraction equilibrium, Distribution ratio

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CAO Han-Jin, WANG De-Bao, LIU Pei-Yan, WU Zi-Sheng, YAN Zhong. Extraction Equilibria of Amino Acids with Di-(2-ethylhexyl)phosphoric Acid[J]. Chem. J. Chinese Universities, 1996, 17(3): 386.

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Extraction Equilibria of Amino Acids with Di-(2-ethylhexyl)phosphoric Acid

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