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本文研究了在以甲苯为溶剂用1-苯基-3-甲基-4-苯甲酰基吡唑酮-5(HPMBP,HA)与液体离于交换剂三辛胺(TOA,B)无机酸盐体系协同萃取镨(Ⅲ)及钕(Ⅲ)。旨在探索其协萃机理。发现无机阴离子不同协萃机理不同。 在ClO~(?)作为介质时,协萃平衡可表示如下: Ln~(3+)+4(HA)_o+(HTOA~+,ClO_4~-)_o=(HTOA~=,LnA_4~-)_o+4H~++ClO~(4-)式中Ln~(3+)=pr~(3+),Nd~(3+);下标o表示有机相,无下标代表水相。 在NO_3~-介质中,协萃平衡有所不同: Ln~(3+)+3(HA)_o+(HTOA~+,NO_3~-)_o=(HTOA~+LnA_3NO_3~-)_o+3H~+ 在Cl~-介质中,也是生成离子对协萃合物(HTOA~+,LnA_4~-)_o,但是当HTOA~+,Cl~-浓度增大至一定程度时,即出现“对抗效应”,logD随log(HTOA~+,Cl~-)_o增大而减小。
In this paper, the effects of 1-phenyl-3-methyl-4-benzoylpyrazolone-5 (HPMBP, HA) and liquid on the separation of TOA, B Synergistic Extraction of Praseodymium (Ⅲ) and Neodymium (Ⅲ) from Salt System. Designed to explore its collaboration mechanism. It is found that different anions have different stripping mechanism. When ClO ~ (?) Is used as a medium, the equilibrium of stripping can be expressed as follows: Ln ~ (3 +) + 4 (HA) _o + (HTOA ~ +, ClO_4 ~ -) _o = (HTOA ~ =, LnA_4 ~ -) _o + 4H ~ + + ClO ~ (4-) where Ln ~ (3 +) = pr ~ (3 +), Nd ~ (3+); subscript o represents the organic phase, no subscripts represent the water phase. In the NO_3 ~ - medium, the stripping equilibrium is different: Ln ~ (3 +) + 3 (HA) _o + (HTOA ~ +, NO_3 ~ -) _o = (HTOA ~ + LnA_3NO_3 ~ -) _ o + 3H ~ In Cl ~ - medium, ion-pair complexes (HTOA ~ +, LnA_4 ~ -) _o were also formed. However, when the concentration of HTOA ~ + and Cl ~ logD decreases with the increase of log (HTOA ~ +, Cl ~ -) _o.