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Extraction Studies of Fe(II) Ion from Hydrochloric Acid Solutions by di ‐(2‐Ethylhexyl) Phosphoric Acid
Author(s) -
Yang ChaoYeuh,
Shih JengShang,
Yeh YuChai
Publication year - 1982
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198200003
Subject(s) - chemistry , hydrochloric acid , phosphoric acid , extraction (chemistry) , inorganic chemistry , stoichiometry , oxidizing agent , partition coefficient , aqueous solution , chromatography , organic chemistry
The partition of Fe(II) between hydrochloric acid solution and solvent of di ‐(2‐ethylhexyl)‐phosphoric acid (HDEHP) in kerosene has been studied at varying concentrations of hydrochloric acid, solvent and Fe(II) ion. A stoichiometric extraction equation was derived as: Fe 2+ ( a ) +2(HX) 2(0) =FeH 2 X 4(0) +2H + (a) where the subscripts a and o refer, respectively, to aqueous and organic phases. Corresponding to the stoichiometries, value of Ks which equaled was obtained from the plot of D[H + ] 2 vs . F 2 where D is the observed distribution ratio, F the concentration of HDEHP in organic phase. The kinetic studies of the extraction of Fe(II) species from hydrochloric acid into HDEHP under nitrogen atmosphere was carried out and the forward and back reaction constant was calculated. Also the oxidizing effect of air on the HDEHP‐Fe(II) complex in organic phase was studied.