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Solvent Extraction and Ion Exchange Volume 14, 1996 - Issue 6
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Original Articles

RING-SIZE AND SUBSTTTUENT EFFECTS IN THE SOLVENT EXTRACTION OF ALKALI METAL NITRATES BY CROWN ETHERS IN 1,2-DICHLOROETHANE AND 1 -OCTANOL

Richard A. Sachleben* Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, MS-6119/4500S, PO Box 2008, Oak Ridge, Tennessee, 37831-6119
,
Yanpei Deng Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, MS-6119/4500S, PO Box 2008, Oak Ridge, Tennessee, 37831-6119
,
Darla R. Bailey Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, MS-6119/4500S, PO Box 2008, Oak Ridge, Tennessee, 37831-6119
&
Bruce A. Moyer Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, MS-6119/4500S, PO Box 2008, Oak Ridge, Tennessee, 37831-6119
Pages 995-1015 | Published online: 30 Mar 2007
 
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ABSTRACT

The extraction of alkali metal nitrate salts by solutions of crown ethers in each of the two diluents 1,2-dichlorethane and 1-octanol has been surveyed. The crown ethers include 18-crown-6, 21-crown-7, and 24-crown-8 ethers bearing cyclohexano, benzo, t-alkylbenzo, and/or furano substitutents. The extraction efficiencies of the different crown ethers are examined in terms of ring-size, substituent, and solvent effects. Partition ratios for the crown ethers between water and either 1,2-dichloroethane or 1-octanol are discussed. The extraction selectivities, expressed as the separation factor for cesium over sodium, are examined in relation to crown ether structure.

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