Solvent Extraction of Sodium Permanganate by Mono-benzo 3m-Crown-m Ethers (m = 5, 6) into 1,2-Dichloroethane and Nitrobenzene: a Method which Analyzes the Extraction System with the

摘要

Analytical equations were derived for the extraction of univalent metal salts (MA) by crown ethers (L) into polar diluents. Then, NaMnO4 was extracted at 25 ?C by benzo-15-crown-5 and -18-crown-6 ethers (B15C5 and B18C6) from a water (w)-phase into a 1,2-dichloroethane (DCE)-one. So, the extraction constants of Kex1 and Kex2 were determined, where Kex1 = [NaLMnO4]DCE/[Na+][L]DCE[MnO4 ?] and Kex2 = [NaL+]DCE[MnO4 ?]DCE/[Na+][L]DCE[MnO4 ?] (= Kex1/KNaLMnO4 DCE). From the calculation processes of these Kex values, KD,MnO4 and KMLA DCE values with MLA = NaLMnO4 were obtained and also KNaL DCE values were estimated from the thermodynamic cycle of KML DCE = Kex2/KD,MKD,A. Here, the KMLA DCE, KD,A or KD,M, and KML DCE values denote an ion-pair formation constant of MLA in the DCE-phase, a distribution constant of A? or M+ between the w- and DCE-phases, and a complex formation one of a complex ion ML+ in the DCE-phase, respectively. The same values were obtained for the witrobenzene (NB) extraction systems. By comparing the KNaL org and KD,NaL (= [NaL+]NB/[NaL+]: distribution constant into NB) values with those previously-reported by other methods, the validity of the equations was confirmed. Additionally, extraction-abilities of the extraction systems with DCE and NB were examined, using component equilibrium constants reported before.