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在萃取色层法分离稀土元素中,常用的固定相有:二(2-乙基已基)磷酸(P-204)、2-乙基已基苯基磷酸、2-乙基己基磷酸单2-乙基己基酯(P-507)等。二(1-甲基庚基)磷酸(P215)是P204的异构体,它的支链在α位置上,空间位阻较大,因此对稀土元素的分离应具有较高的分离因数,反萃取的酸度也应比P204的低。我们将P215用于萃取色层法以分离稀土。在一定的酸度下,可将14个稀土元素分离,在有硫酸铵存在时,也可将Y与Ho和Er分离。
In the extraction of color separation of rare earth elements, the commonly used stationary phase are: bis (2-ethylhexyl) phosphate (P-204), 2-ethylhexyl phenyl phosphate, Ethylhexyl ester (P-507) and the like. Bis (1-methylheptyl) phosphoric acid (P215) is an isomer of P204. Its branches are sterically hindered at the α-position, and therefore should have a higher separation factor for the separation of rare earth elements. The acidity of the extract should also be lower than that of P204. We use P215 for extraction chromatography to separate rare earths. In a certain degree of acidity, 14 rare earth elements can be separated, in the presence of ammonium sulfate, Y and Ho and Er can also be separated.