Extraction of phosphoric acid with long-chain tertiary amines—II

Marcus, Yizhak; Asher, Leon; Barak, H.

doi:10.1016/0022-1902(78)80132-8

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…Very few experimental data have been reported in the literature for these systems. However Marcus et al (1978) measured equilibrium data between Alamine 336 in toluene, phosphoric acid, and the acids HCl, HBr and H2S04. Their experimental data at 25 "C were compared with the binary models presented above.…”

Section: Binary Mixturesmentioning

confidence: 99%

“…Hydrochloric acid is, for 3 of the 5 data values close to maximum loading and for the other two acceptably modelled for low amine concentrations, but somewhat too high values are obtained for high amine concentrations. The data of Marcus et al (1978) incorporate values with higher (1 1 %) organic HC1 concentrations compared with the total amine concentration. This model does not incorporate amine salts where the amine to hydrochloric acid ratios differ from 1.…”

Section: Binary Mixturesmentioning

confidence: 99%

“…The calculated sulphuric acid extraction is about 20% too low but with the correct trend. Marcus et al (1978) Thus no pure acid isotherm was included for HX. The conclusion from this comparison is that the mixed complexes seem to have too strong an influence for these binary solutions.…”

Section: Binary Mixturesmentioning

confidence: 99%

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On the modelling of multicomponent acid extraction with long‐chain aliphatic amines

Stenström

Wingefors

1988

Can J Chem Eng

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The solvent extraction of phosphoric, hydrochloric, sulphuric, hydrofluosilicic and hydrofluoric acids with long‐chain aliphatic amins is modelled. Pure acid equilibria are based on existing isotherms or calculated extraction constants when only experimental data are available. For binary mixtures binary combinations of acid complexes are added. In the aqueous phase Bromley's model for electrolytes is used for calculation of ionic activity coefficients and the appropriate association/dissociation equilibria taken into account for calculation of ionic strength. For the organic phase an empirical model for the non‐ideal behaviour of phosphoric acid is used. For multicomponent mixtures at low acid concentrations the model calculates the extraction of phosphoric, hydrochloric and sulphuric acid almost quantitatively. For hydrofluosilicic and hydrofluoric acid the calculations are less precise and further information is needed about the different fluoride exchange equilibria involved.

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Section: Binary Mixturesmentioning

confidence: 99%

Section: Binary Mixturesmentioning

confidence: 99%

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On the modelling of multicomponent acid extraction with long‐chain aliphatic amines

Stenström

Wingefors

1988

Can J Chem Eng

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“…An excellent summary of early research on the extraction of organic and strong acids by high-molecular-weight amines is given by Marcus and Kertes (1969). More recent investigators extracted nitric, hydrochloric, and hydrofluoric acids using LA-2 amine dissolved in kerosene (Russo et al, 1975), examined the effects of nitric acid and uranium on the extraction of hydrofluoric acid by primary amines (Beranova and Kuca, 1975), extracted phosphoric acid with tertiary amines (Marcus et al 1978), and extracted thiocyanic acid using various high-molecular-weight extractants including amines (DeJong and Brinkman, 1978). Process development work has been published on recovery of nitrate ions by secondary amines (Mattila and Lehto, 1977) and on deacidification of glyoxal using tertiary amines (McCain and Theiling, 1980).…”

Section: Introductionmentioning

confidence: 99%

Fluosilicic acid extraction by high-molecular-weight amines

Tivnan¹,

McCluskey²

1982

Ind. Eng. Chem. Proc. Des. Dev.

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The extractlon of fluoslilclc acid from dilute aqueous solutions by high-molecular-weight amines in kerosene has been studied. Extraction equlllbrium curves for various commercial amines are presented for room temperature, an amine concentration of 0.2 M, and aqueous acid concentrations up to 1 M. Formation of stable suspensions, coextraction of water, and aggregation of amine salts are discussed. Amine extraction of fluosilicic acid is compared with that of other mineral acids. The enthalpy, entropy, and equilibrium constant of the reversbble binding of NO to FeI'NTA in an aqueous solutionhave been determined to be AHo = -11.9 kcal/mol, AS = -11.1 eu, and K = 4.6 X lo5 M-' at 50 OC, respectively. The formation and dissociation rate constants of Fe"(NTAXN0) are k 1 7 X 10' M-l s-l a nd k -, 2 35 s-', respectively, at 25 OC. The rate of binding of NO to form the complex is much faster than the mass transfer rate at typical wet scrubber conditions.

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