二-(2-乙基己基)磷酸P204与三烷基叔胺N235协同萃取钼

应用化学, 2009, 26(11): 1353-1356. doi: 10.3969/j.issn.1000-0518.2009.11.023

二-(2-乙基己基)磷酸P204与三烷基叔胺N235协同萃取钼

孙盈 ^1, , 李艳玲 ^2, , 权新军 ^3, , 廖伍平 ^4,

1.吉林大学化学学院,长春

2.中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春,130022

3.吉林大学化学学院,长春

4.中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春,130022

基金项目: 国家自然科学基金(50704029) 吉林省科技发展计划(20080116)

关键词：协同萃取 , 钼 , 三烷基叔胺 , 二-(乙基己基)磷酸

Synergistic Extraction of Molybdenum Using Acid-base Coupling Extractants of Di-2-ethylhexyl Phosphoric Acid(P204) and Trialkylamine N235

Keywords： synergistic extraction , molybdenum , trialkylamin , di-ethylhexyl phosphoric acid

研究了P204(二-(2-乙基己基)磷酸,HA)和N235(三烷基叔胺,R_3N)二元体系在HCl介质中对金属钼的萃取. 结果表明,P204和N235混合萃取剂在萃取钼时存在协同效应,并且在N235摩尔分数为0.7时协萃系数为2.24;考察了溶液酸度、P204或N235浓度及温度对萃取钼的影响,确定了协萃络合物为(R_3NH)_3·HMo_8O_(26)·(HA)_2,并比较了负载前后有机相的红外光谱.

Synergistic effect on the extraction of molybdenum by the mixed extractants of di-2-ethylhexyl phosphoric acid ( P204) and trialkylamine N235 was investigated. The mixed system showed an obvious enhancement on the extraction of molybdenum with a mole fraction of N235 being about 0. 7. The effects of the aqueous acidity, the concentration of P204 or N235 and temperature on the extraction of molybdenum were further studied. The reaction mechanism was deduced and the extracted species was determined to be (R_3NH)_3 o HMo_8O_(26) o (HA)_2. FT-IR spectra of the mixed extractants and the loaded organic phase were examined.

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