1,2-双(1′-苯基-3′-甲基-5′-氧代吡唑-4′-基)乙二酮-〔1,2〕与三正辛基氧化膦协同萃取RE(Ⅲ)的性能和机理研究  

RE(Ⅲ) Synergistic Extraction with 1,2-Bis(1′-Phenyl-3′-Methyl-5′- Pyrazolone-4′-yl) Ethanedione-[1,2]and Tributyl Phosphate

作　　者：张安运[1] 

机构地区：[1]陕西师范大学化学系,陕西西安710062

出　　处：《稀土》2001年第1期1-4,共4页Chinese Rare Earths

摘　　要：研究了 1,2 -双 ( 1′-苯基 - 3′-甲基 - 5′-氧代吡唑 - 4′-基 )乙二酮 -〔1,2〕( H2 A )与三正辛基氧化膦 ( TOPO )协同萃取 RE( ) ( RE=L a、Pr、Nd、Gd、Dy和 Y)的性能。通过考察萃取剂浓度、溶液酸度和温度对 RE( )萃取平衡的影响 ,确定了萃取机理和萃合物组成 ,求得了半萃取 p H1 /2 值和萃取反应平衡常数 Ks.e.。The synergistic extraction properties and mechanism of RE(Ⅲ)(RE=La,Pr,Nd,Y,Gd and Dy)with 1,2 bis(1' phenyl 3' methyl 5' pyrazolone 4' yl)ethanedione [1,2](H 2A)and tributyl phosphate(TOPO)have been studied in nitric acid solution at 30±1℃.The results show that there is a notable synergistic effect on La 3+ for H 2A+TOPO system,and the synergistic extraction coefficient of La 3+ is calculated to be 4.4.By investigating the influence of concentrations of H 2A and TOPO on the extraction of La 3+ ,the composition of the extracted compound is determined as LaA·HA·TOPO.The half extraction pH 1/2 values of La 3+ ,Pr 3+ ,Nd 3+ ,Y 3+ ,Gd 3+ and Dy 3+ are 3 65,3 05,2 78,2 63,2 46 and 2 36,respectively.Meanwhile,the extraction equilibrium constants,enthalpy change and entropy change of the reaction are also calculated.

关 键 词：稀土元素 1 2-双(1'-苯基-3’-甲基-5'-氧代吡唑-4’-基)乙二酮-[1 2] 三正辛基氧化膦 协同萃取 

分 类 号：O614.33[理学—无机化学] O652.62[理学—化学]