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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
Author(s) -
Yoshihisa Kudo,
Kyohei Harashima,
Shoichi Katsuta,
Yasuyuki Takeda
Publication year - 2011
Publication title -
international journal of chemistry
Language(s) - English
Resource type - Journals
eISSN - 1916-9701
pISSN - 1916-9698
DOI - 10.5539/ijc.v3n1p99
Subject(s) - chemistry , nitrobenzene , extraction (chemistry) , stability constants of complexes , 1,2 dichloroethane , phase (matter) , 15 crown 5 , 18 crown 6 , solvent , inorganic chemistry , ion , chromatography , crown ether , organic chemistry , catalysis
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 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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