烷基膦酸单烷基酯萃取钪的机理研究

STUDY ON EXTRACTION MECHANISM OF SCANDIUM (III) WITH ALKYLPHOSPHONIC ACID MONOALKYL ESTER

摘要: 研究了仲辛基膦酸单异辛基酯(PT-19)、异丙基膦酸单(1-己基-4-乙基)辛基酯(PT-2)和2-乙基己基膦酸单(2-乙基己基)酯(P_(507))等烷基膦酸单烷基酯的正庚烷溶液从盐酸介质中萃取钪的机理。讨论了平衡水相酸度、萃取剂浓度、温度对萃取平衡的影响,计算了反应的浓度平衡常数和热力学函数,考察了萃合物的IR与NMR谱。

Abstract: The extraction mechanism of Sc(III) from hydrochloric acid solutions with s -octylphosphonic acid mono-iso-octyl ester(PT-19), iso-propylphosphonic acid mono-(1-hexyl-4-ethyl )octy 1 ester(PT-2) and 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (P507) in heptane is investigated. The extraction reaction of Sc(III)can be expressed respectively as follows:The equilibrium constants and thermodynamic functions of extraction reactions are calculated. The IR and NMR spectra of the extraction complexes of Sc(III)are discussed as well.