HEHEHP与PMBP协同萃取希土元素(Ⅲ)的机理研究

HEHEHP与PMBP协同萃取希土元素(Ⅲ)的机理研究

INVESTIGATION OF SYNERGISTIC EXTRACTION MECHANISM OF RARE EARTH ELEMENTS(Ⅲ) WITH HEHEHP AND PMBP

摘要

摘要: 本文研究了2-乙基己基膦酸单(2-乙基己基)酯(HEHEHP,HL)和1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5(PMBP,HA)的苯溶液在不同矿物酸(H_2SO_4,HCl HNO_3)介质中对希土元素(Ⅲ)的协同萃取。并以Nd~(3+),Yb~(3+),Lu~(3+)为例,研究了HEHEHP-PMBP苯溶液从HNO_3介质中协同萃取希土元素(Ⅲ)的机理,用斜率法确定了协萃配合物的组成,轻希土元素为Nd(HL_2)·A_2,重希士元素为Yb(HL_2)·A,Lu(HL_2)_2·A,计算了协萃反应的平衡常数,还研究了温度对协萃反应的影响,求出了萃取过程的热力学函数。观测了协萃配合物的IR及NMR谱。

Abstract: The synergistic extraction of rare earth elements(Ⅲ) including La, Nd, Gd, Er, Yb, Lu and Y from aqueous mineral acid (H2SO4, HC1, HNO3 ) with binary system 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (HEH-EHP, HL) and 1_phenyl-3-methyl_4-benzoyl-pyrazolone-5 (PMBP, HA) in toluene has been investigated. The compositions of the synergistic extracting complexes and the mechanism of the synergistic extraction have been determined by the methods of slope and constant molarity. The synergistic extracting complexes Nd(HL2)A2 and Yb(HL2)2A have been demonstrated. The synergistic extraction reactions of rare earth elements (Ⅲ) have been proposed as follows.The equilibrium constants and the thermodynamic functions of the synergistic reactions have been calculated. The IR and NMR of the synergistic extracting complexes have been studied as well.

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