N-正丁基异辛酰胺合成及其萃取Pt(IV)的性能

Synthesis of N-Butyl Isooctylamide and Study on Its Extraction of Pt(IV)

合成了N-正丁基异辛酰胺(BiOA),并对其从盐酸介质中萃取Pt(IV)进行了研究.结果表明:待萃液Pt(IV)浓度为1.000 g·L-1,HCl浓度为5 mol·L-1时,用2.0 mol·L-1N-正丁基异辛酰胺-5%TBP-正辛烷按相比(O/A)1:1混合萃取Pt(IV),经过5 min的萃取振荡,萃取率可达99.5%.此萃取体系中TBP对Pt(IV)无协萃效应;水是载Pt(IV)有机相的有效反萃剂,反萃率可以达到90.3%.N-正丁基异辛酰胺萃取Pt(IV)的反应是放热反应,反应热为-10.52 kJ·mol-1.红外光谱分析表明,在1 mol·L-1～5 mol·L-1的HCl范围内,N-正丁基异辛酰胺萃取铂的反应为酸性离子缔合萃取.萃取反应为:PtCl62-+2BiOA(0)+2H+→[(BiOAH+)2·PtCl62-](0).

N-butyl isooctylamide （BiOA） was prepared and characterized by IR, MS and H-NMR spectra. The performance of extracting platinum（IV） using N-butyl isooctylamide were investigated, Extraction percentage of Pt（IV） reaches to 99.5% from 5 mol·L^-1 HCl with 2.0 mol·L^-1 BiOA-5%TBP in octane. TBP was no synergistic extraction for Pt（IV） in this system. Water is efficient stripping reagent. The extraction reaction is an exothermic reaction and △H =-10.52 kJ·mol^-1. When HCl concentration ranges from 1.0 mol·L^-1 to 5.0 mol·L^-1, the reaction of extracting Pt（IV） was acid ion association extraction and the extraction equation was： PtCl6^2-＋2BiOA（0）＋2H^＋→ [ （BiOAH^＋）2·PtCl6^2- ]（0）