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分别用乙基纤维素和海藻酸钙作为膜材，将Ｐ５０７（２－乙基己基鳞酸单２－乙基己基酯）微胶囊化。将这两种含萃取剂的微胶囊用于萃取Ｌａ３＋、Ｎｄ３＋和Ｌｕ３＋，可以将这些离子富集于微胶囊内。由于固体膜对芯材固定化和对离子的阻障作用，使萃取的传质过程发生了变化。以渗透系数来比较三种离子的传质速度，改变原料液的ｐＨ，可使离子的渗透系数改变，从而增大离子间渗透系数的差值。用６ｍｏｌＬ－１的ＨＣｌ对微胶囊内稀土离子进行反萃取，可以定量地富集稀土。
P507 (2-ethylhexyl 2-ethylhexyl) acetate was microencapsulated with ethyl cellulose and calcium alginate as the membrane respectively. These two kinds of extraction agent-containing microcapsules for the extraction of La3 +, Nd3 + and Lu3 +, these ions can be enriched in the microcapsules. Due to the immobilization of the solid membrane on the core material and the barrier function of the ions, the mass transfer process of extraction is changed. The permeability coefficient to compare the mass transfer rate of three ions, changing the pH of the feed solution, the permeability coefficient of ions can change, thereby increasing the difference between the permeability coefficient of ions. Rare earths can be quantitatively enriched by stripping rare earth ions in microcapsules with 6 molL-1 HCl.