1-苯基-3-甲基-4-苯甲酰吡唑啉酮-5萃取镓的研究  

Extraction of Gallium(III) with HPMBP

作　　者：杨永会[1] 孙思修[1] 薛梅[1] 刘萍[1] 

机构地区：[1]山东大学化学院,济南250100

出　　处：《化学学报》1998年第6期606-611,共6页Acta Chimica Sinica

基　　金：国家自然科学基金资助课题(2961022)

摘　　要：首次报道了1-苯基-3-甲基-4-苯甲酸吡唑啉酮-5(HPMBP)萃取镓的热力学和动力学,指出在体系中形成Ga(PMBP)_3(H_2O)_2萃合物,配体PMBP既有一次溶剂化作用,又有二次溶剂化作用,并得到红外光谱和核磁共振谱的证实.镓的萃取过程为水相化学反应控制,决速步骤为一次溶剂化过程:Ga^(3+)+HPMBP→Ga(PMBP)^(2+)+H^+.添加剂三辛基氧化膦(TOPO)不影响HPMBP萃取镓的分配比,但降低了HPMBP萃取镓的正向速率,表明动力学抑萃作用与热力学抑萃作用无对应关系.The extraction equilibrium and kinetics of gallium( III ) from hydrochloric acid solutions with 1 - phenyl - 3 - methyl - 4 - benzoyl - pyrazolone - 5(HPMBP) in carbon tetrachloride have been investigated. The composition of the extracted species was found to be Ga(PMBP)3 2H2Ovia the method of slopes, IR and NMR spectra. The values of Kex,△H°, △G° and △S° at 298Kwere calculated. The extraction kinetics of Ga(III) was studied with the growing drop method. The extraction rate equation can be expressed as Rf=kf[Ga3+] [HL](o). The activation energy ofthe reaction was calculated to be 15.9kJ·mol-1. The rate determing step was deduced to takeplace in water phase:Ga3+ HL→GaL2+ + H+ ,which is an immediate coordination process.

关 键 词：HPMBP 镓 萃取热力学 萃取动力学 分离 萃取剂 

分 类 号：O614.371[理学—无机化学]