N,N-二仲辛基氨基乙酸萃取Pt(Ⅱ)和Pd(Ⅱ)

金属学报, 1985, 21(5): 85-91.

N,N-二仲辛基氨基乙酸萃取Pt(Ⅱ)和Pd(Ⅱ)

内蒙古医学院

国家物资局徐州稀贵金属再生利用研究所

中国科学院上海有机化学研究所

EXTRACTION OF Pt(II)AND Pd(II)WITH N,N-DISECONDARYOCTYLGLYCINE

ZHANG Jianmin , ZHANG Aiyou , HE Zhenyu , MA Guangjia Xuzhou Institute of Reclamation and Utilization of Less-Common Metals , State Bureau of Supplies , YUAN Chengye , ZHOU Liying

本文以N,N-二仲辛基氨基乙酸为萃取剂,三氯甲烷(50v.-%)和煤油为稀释剂组成的萃取有机相,在萃取Pt(Ⅱ)和Pd(Ⅱ)过程中,研究HCl浓度、Pt(Ⅱ)和Pd(Ⅱ)起始浓度,离子强度和萃取剂浓度等诸因素对分配比的影响.根据实验结果,认为在萃取Pt(Ⅱ)的过程中,萃取剂浓度高吋,有机相中形成[R_2NHCH_2COOH+][PtCl_3(R_2NCH_2COOH]-的萃合物,而低浓度时为H[PtCl_3(R_2NCH_2COOH)],萃取Pd(Ⅱ)时,有机相形成[R_2NHCH_2COOH]+[PdCl_3(R_2NCH_2COOH)]-的萃合物.本文对HCl浓度变化等诸因素对分配比的影响作了解释.

The mechanism of extraction of Pt(Ⅱ)or Pd(Ⅱ)with N,N-disecondaryoctylg-lycine was investigated in the extraction system:H_2PtCl_4(or H_2PdCl_4) (?)/HCI(0.05—9 N)/(i-C_8H_(17))_2 NCH_2COOH CHCl_3(50 v.-%)-kerosene.The effects of con-centration of HCl,initial concentration of Pt(Ⅱ)or Pd(Ⅱ)and ionic strength(LiCl)in aqueous phase,extractant concentration in organic phase and phase ratio(A:O)on distribution ratio(D)were studied and the composition of the extrac-ted species of Pt(Ⅱ)and extractant was evaluated as H~+[PtCl_3(i-C_8H_(17))_2NCH_2-COOH]~- or[(i-C_8H_(17))_2NHCH_2COOH]~+[PtCl_3(i-C_8H_(17))_2NCH_2COOH]~-.And the extra-cted species of Pd(Ⅱ)and extractant was considered as(R_2NHCH_2COOH)~+[PdCl_3(R_2NCH_2COOH)]~-.

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