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

Yoshihiro Kudo, Kyohei Harashima, Shoichi Katsuta, Yasuyuki Takeda


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
(= 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
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 w/nitrobenzene (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.

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International Journal of Chemistry   ISSN 1916-9698 (Print)   ISSN 1916-9701 (Online)

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