Mechanism of the slow extraction of iron(III) from acid perchlorate solutions by di(2-ethylhexyl)phosphoric acid in n-octane

Roddy, J.W.; Coleman, C.F.; Arai, Sumio

doi:10.1016/0022-1902(71)80179-3

Cited by 68 publications

(24 citation statements)

References 7 publications

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“…A similar type of mechanism through the formation of hydroxy species has been suggested for the extraction of Fe(II1) with HDEHP by Roddy et al (26). Similar to the fact that the sulphate ion (10) decreases the distribution ratio of Cr(III), the rate of extraction of Cr(II1) is also decreased by the presence of sulphate ion, probably due to the formation of the aqueous Cr3 +-SO,' -complex and/or Cr3 + -SO,'-ion pairs (27).…”

Section: T No3-concentrationssupporting

confidence: 54%

Kinetics of solvent extraction of metal ions with HEDHP. III. The kinetics and mechanism of solvent extraction of Cr(III) from acidic aqueous solutions with bis-(2-ethyl hexyl) phosphoric acid in benzene

Islam¹,

Biswas²

1979

Can. J. Chem.

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MUHAMMAD FAKHRUL ISLAM and RANJIT KUMAR BISWAS. Can. J. Chem. 57,3011 (1979). The rate of solvent extraction of chromium(II1) from aqueous sulphuric acid solutions (containing 0.05 mol dm-3 sulphate ion and 0.25 mol dm-3 acetate buffer, ionic strength, I = 0.40 mol dm-3) with bis-(2-ethyl hexyl) phosphoric acid (HDEHP or H2Az) in benzene has been measured under various conditions. The rate of backward extraction measurement of Cr(II1) from organic phase to aqueous phase is not possible due to the inert property of Cr(II1)-DEHP chelate. The forward rate is found to be first-order w.r. [Traduit par Ie journal]

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Section: T No3-concentrationssupporting

confidence: 54%

Kinetics of solvent extraction of metal ions with HEDHP. III. The kinetics and mechanism of solvent extraction of Cr(III) from acidic aqueous solutions with bis-(2-ethyl hexyl) phosphoric acid in benzene

Islam¹,

Biswas²

1979

Can. J. Chem.

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“…Iron(III) extraction with di(2-ethylhexyl) phosphoric acid (D2EHPA) has been extensively studied. [7,[17][18][19][20][21][22] Difficulties have been reported in stripping the loaded organic, [11,19,20] when an acidic extractant such as Versatic 10 or D2EHPA was used as the extractant. A high concentration of acid is required to strip iron(III) from these acidic extractants, and regeneration of these solvents is a problem.…”

Section: Introductionmentioning

confidence: 99%

“…Most of these studies, however, examine the extraction of iron when its concentration in solution is not very high, which will be the condition if pure iron oxide is produced in bulk through solvent extraction techniques. Several solvents such as organophosphorus acid derivatives, [3,7,[15][16][17][18][19][20][21][22] carboxylic acids, [8,11,[23][24][25] amines, [4,6] etc. have been used for iron extraction.…”

Section: Introductionmentioning

confidence: 99%

“…Over the past 3 decades, a considerable amount of work has been carried out and reported [3][4][5][6][7][8][9][10][11][12][13][14] on iron(III) removal from solutions by solvent extraction. Most of these studies, however, examine the extraction of iron when its concentration in solution is not very high, which will be the condition if pure iron oxide is produced in bulk through solvent extraction techniques.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Sahu

Das

1997

Metall Mater Trans B

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The extraction of iron(III) from chloride solutions at macrolevel concentration by different solvents such as tri-n-butyl phosphate (TBP), di(2-ethylhexyl) phosphoric acid (D2EHPA), and their mixture in various proportions has been investigated at different acid concentrations. The synergistic extraction of iron(III) with a mixture of TBP and D2EHPA was studied and the results were compared with that of the extraction by individual solvent alone. An increase in the concentration of the synergist, TBP, in the D2EHPA-TBP solvent system resulted in an increase in the synergistic coefficient value. The experimental data are treated graphically to explain the formation of organic phase extracted species, and the equilibrium extraction constants for the species are determined. It is found that a maximum of two molecules of TBP are adducted to the extracted species of the corresponding nonsynergistic system. Stripping of iron(III) with hydrochloric acid from loaded D2EHPA was found to increase with an increase in acid concentration. In the case of D2EHPA-TBP mixtures, stripping efficiency was increased with an increase in acid concentration up to a certain level and then it was decreased. The experimental results indicate that an iron exchange reaction between loaded D2EHPA and TBP proceeds during stripping at a higher concentration of hydrochloric acid (from mixed loaded solvent system). A plausible mechanism for iron(III) extraction and stripping has been discussed.

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“…The investigation on the solvent extraction of iron (III) mainly focused on separation of iron from blue dust, iron scrap, waste chloride pickle liquors from steel plants and ilmenite leach liquors. A survey of the literature showed that a large number of reagents had been used for the extraction of iron (III), such as organophosphorus acid derivatives [1][2][3][4][5][6][7] , amines [8][9][10][11] , neutral extractants [12][13][14][15] , carboxylic acid etc. Among them, organophosphorus acid extractants and amines are the leading extractants for iron (III) in acid solutions.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction of iron (III) from chloride acid solutions by decanol

Mao¹

2015

Proceedings of the 3rd International Conference on Material, Mechanical and Manufacturing Engineering

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The solvent extraction of iron (III) from acidic chloride solutions by decanol in kerosene has been investigated. The solvent extraction results demonstrated that the dissolved iron was present as HFeCl 4 .2Decanol. Extraction of iron (III) increased with increased hydrochloric acid concentration in the aqueous phase. On the other hand, titanium (IV ) aluminum (III), calcium (II) and magnesium (II) were not extracted under these experimental conditions. IR spectral study of the extracted complex was further used to clarify the nature of the extracted complex. The extracted complex was easy to strip. Using 0, 0.5 and 1 mol.dm -3 HCl as the stripping agents the stripping rate of iron (III) was above 90%.

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Mechanism of the slow extraction of iron(III) from acid perchlorate solutions by di(2-ethylhexyl)phosphoric acid in n-octane

Cited by 68 publications

References 7 publications

Kinetics of solvent extraction of metal ions with HEDHP. III. The kinetics and mechanism of solvent extraction of Cr(III) from acidic aqueous solutions with bis-(2-ethyl hexyl) phosphoric acid in benzene

Kinetics of solvent extraction of metal ions with HEDHP. III. The kinetics and mechanism of solvent extraction of Cr(III) from acidic aqueous solutions with bis-(2-ethyl hexyl) phosphoric acid in benzene

Synergistic extraction of iron(III) at higher concentrations in D2EHPA-TBP mixed solvent systems

Solvent extraction of iron (III) from chloride acid solutions by decanol

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