摘要
本文利用液相色谱(反相色谱)的原理,判定钼磷杂多酸萃合物的极性大于伯胺和TBP。根据负荷有机相的红外光谱,认为萃合物属于离子缔合型化合物(pH5～7)。考虑到在pH5～7范围内,伯胺以分子形式存在,可以认为,在萃取过程中,伯胺和杂多酸先以氢键形式缔合成萃合物,[RNH_2]_6…[H_6P_2Mo_5O_(23)]…[xTBP][x<1]。由于杂多酸是强酸,伯胺是弱碱,在萃合物内部发生了质子转移而形成了离子缔合物[RNH_3]_6[P_2Mo_5O_(23)]·xTBP。
Mechanism of synergistic extraction of phosphorus from molybdate solution at pH5-7 with primary amine (RNH_2) and tributylphosphate (TBP) as solvents was studied by High Performance Liquid Chromatography, IR and UV spectra as well as chemical analysis. The experimental results showed that phosphorus was extracted intc organic phase as 5-molybdodiphosphoric acid by solration mechanism with the formation of hydrogen bonding between RNH_2, TBP and molybdophosphoric acid. However, the extracted species exists a...
出处
《有色金属》
CAS
CSCD
1992年第3期59-62,共4页
Nonferrous Metals
关键词
磷
钼酸盐
钼磷酸盐
萃取
胺
TBP
phosphorus molybdate molybdophosphate extraction amine TBP
