Ra. Sachleben et al., RING-SIZE AND SUBSTITUENT EFFECTS IN THE SOLVENT-EXTRACTION OF ALKALI-METAL NITRATES BY CROWN-ETHERS IN 1,2-DICHLOROETHANE AND 1-OCTANOL, Solvent extraction and ion exchange, 14(6), 1996, pp. 995-1015
The extraction of alkali metal nitrate salts by solutions of crown eth
ers in each of the two diluents 1,2-dichlorethane and l-octanol has be
en surveyed. The crown ethers include 18-crown-6, 21-crown-7, and 24-c
rown-8 ethers bearing cyclohexano, benzo, t-alkylbenzo, and/or furano
substitutents. The extraction efficiencies of the different crown ethe
rs are examined in terms of ring-size, substituent, and solvent effect
s. Partition ratios for the crown ethers between water and either 1,2-
dichloroethane or l-octanol are discussed. The extraction selectivitie
s, expressed as the separation factor for cesium over sodium, are exam
ined in relation to crown ether structure.