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液膜分离是近年才发展起来的一种新分离技术。早在1968年Tosteson就已观察到冠醚化合物在人造膜中对K~+、Na~+离子的选择性与天然大环化合物在细胞膜中的作用具有共同之处。Cussler曾测定了DB-18-C-6为载体的液膜中一些金属离子的传输通量。Lamb比较了以DB-18-C-6、DT-18-C-6及DKP-18-C-6为载体的氯仿液膜中Pb~(2+)/Na~+、Pb~(2+)/Ca~(2+)、Pb~(2+)/Fe~(3+)、Pb~(2+)/Zn~(2+)的选择比。同时他们还测定了十多种冠醚化合物为载体的氯仿液膜中一些一价和二价金属离子硝酸盐
Liquid membrane separation is a new separation technology developed in recent years. As early as 1968, Tosteson observed that the selectivity of crown ethers to K ~ +, Na ~ + ions in the artificial membrane has something in common with the action of natural macrocycles in the cell membrane. Cussler had measured the transfer flux of some metal ions in the liquid film of DB-18-C-6. Lamb compared the Pb ~ (2 +) / Na ~ +, Pb ~ (2+) content in chloroform solution with DB-18-C-6, DT-18-C-6 and DKP-18- ) / Ca ~ (2 +), Pb ~ (2 +) / Fe ~ (3 +), Pb ~ (2 +) / Zn ~ (2+) At the same time, they also measured a number of monovalent and divalent metal ion nitrates in the chloroform solution of more than ten crown ether compounds