二(二烷基甲基)胺萃铂机理研究

STUDY ON MECHANISM OF EXTRACTION OF PLATINUM BY DI(DIALKYL METHYL)AMINE

本文研究了二(二烷基甲基)胺(7203)从氯化物体系中萃取铂的机理.结果表明在 pH2.45前后,铂的萃取率出现最大值.采用斜率法确定萃合物驵成为(R_2HNH)_2PtCl_4.通过紫外-可见光谱法研究,证实7203萃铂机理为阴离子交换反应,可表示为2R_2HN·HCl_(o)+PtCl_(1(A))^(2-)(R_2HNH)_2PtCl_(4(o))+2Cl_(A)^-

The extraction mechanism of platinum from chloride systems by di(dialkyl methyl)amine(7203)was studied.The results show that the extraction rate of platinum reaches the maximum at pH 2.45.The composition of the extracted complex is(R_2HNH)_2PtCl_4 as determined by the saturation method,slope method and the method of equimolal series.Based on UV-vis-spectra study,the extraction mechanism of platinum with di(dialkyl methyl)amine (7203)was proved to be an anion exchange reaction as follows 2R_2HN.HCl_(o)+PtCl_(4(A))^(2-)≒(R_2HNH)_2PtCl_(4(O))+2Cl_(A)^-