<EM>N</EM>-吡咯烷基-2-吡啶甲酰胺与1， 10-菲啰啉对U（Ⅵ）的协同萃取

N-吡咯烷基-2-吡啶甲酰胺与1， 10-菲啰啉对U（Ⅵ）的协同萃取

摘要: 研究了N-吡咯烷基-2-吡啶甲酰胺（NPPFA）与1, 10-菲啰啉（1, 10-phenanthroline， phen）在硝酸介质中对U（Ⅵ）的协同萃取行为。以二氯乙烷为稀释剂，考察了NPPFA的摩尔分数、水相pH值、盐析剂浓度及温度对萃取分配比的影响。结果表明，NPPFA与phen有显著的协萃作用；当pH大于2.2时，萃取体系易发生乳化现象；盐析剂的加入可以大大提高萃取效率。并用斜率法确定了萃合物的组成为UO₂(NO₃)₂·NPPFA·phen。 

Abstract: The synergistic extraction of U(Ⅵ) from nitric acid solution into mixture of 1-(2-pyridyl)-1-pyrrolidyl-1-methanone（NPPFA） and 1, 10-phenanthroline (phen) in dichloride ethane was studied. The influences of mole fraction of NPPFA, value of pH, the concentration of salting-out agent and temperature on the distribution ratio were discussed. The results show that NPPFA and phen give strong synergism and the distribution ratio of U (Ⅵ) is high by introducing salting-out agent. The formula of synergistic extraction compounds determined by slope analysismethod is UO₂(NO₃)₂·NPPFA·phen.