MA Genxiang LI Deqian Changchun Institute of Applied Chemistry
,
Academia Sinica
,
Changchun
,
China Changchun Institute of Applied Chemistry
,
Academia Sinica
,
Changchun
,
Jilin
,
China
金属学报(英文版)
The synergistic extraction of Cd(Ⅱ)with primary amine N-1923 and neutral organophosphorus reagents(TBP,DBBP,B)from hydrochloric acid has been investigated at μ=0.5,t=25℃.The compositions of the synergistic extraction complexes and the mechanism of the synergistic extraction have been determined by the methods of slope and constant mole. The synergistic extraction complexes with composition(RNH_3Cl)_2·CdCl_2·B have been demonstrated.The synergistic extraction reactions and additional reaction of Cd(Ⅱ)have been proposed as follows: CdCl_2+2RNH_3Cl_(o)+B_(o)(RNH_3Cl)_2·CdCl_2·B_(o) (RNH_3Cl)_3·CdCl_(2(o)+B_(o)(RNH_3Cl)_2·CdCl_2·B_(o)+RNH_3Cl_(o) In addition,the equilibrium constants and the thermodynamic functions of the synergistic ex- traction reactions have been calculated.The IR and NMR spectra of the synergistic ext-ac- tion complexes of Cd(Ⅱ)have been studied as well.
关键词:
primary amine
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null
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null
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null
马根祥
,
李德谦
金属学报
本文研究了伯胺N_(1923)与中性磷试剂(TBP,DBBP)的正庚烷溶液,从盐酸介质中对Cd(II)的协同萃取。用斜率法、等摩尔系列法确定协萃配合物的组成为(RN-H_3Cl)_2·CdCl_2·B,求得协萃反应的平衡常数分别为lgK_(12)(TBP)=2.13,lgK_(12)(DBBP)=2.37;有机相协萃配合物的生成常数分别为lgβ_(12)(TBP)=1.22,lgβ_(12)(DBBP)=1.41,计算了协萃反应的热力学函数,并对协萃配合物的IR,NMR谱进行了研究。
关键词:
伯胺
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neutral organophosphorus reagent
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synergistic extraction
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cadmium
孙盼
,
黄焜
,
刘会洲
中国有色金属学报
采用酸化伯胺A-N1923-酒石酸钠体系,研究强碱性溶液中的钒、铬萃取分离行为,同时考察铝在钒、铬萃取分离过程中的走向.结果表明:碱性溶液中添加少量的酒石酸钠,可显著抑制钒铬的共萃,即使在浓度大于0.1 mol/L的NaOH溶液中,仍然可以实现钒、铬的萃取分离;钒、铬、铝的萃取分离受酒石酸钠浓度、料液初始碱度、初始钒铬浓度、萃取相比及萃取剂浓度等影响较大.当料液pH值在10～13之间时,钒/铬、铝/铬的分离系数可分别达到89和60.298 K时,有机相对钒的饱和萃取容量为5.855 g/L.萃取负载有机相可以先用0.5mol/L的硝酸钠溶液选择性反萃铝,然后用1.5 mol/L的硝酸钠溶液反萃钒,反萃后有机相可再生循环使用.
关键词:
钒
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铬
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萃取
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分离
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碱性溶液
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伯胺
