2004
DOI: 10.1016/j.fluid.2004.03.013
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The electrolyte NRTL model and speciation approach as applied to multicomponent aqueous solutions of H2SO4, Fe2(SO4)3, MgSO4 and Al2(SO4)3 at 230–270°C

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Cited by 22 publications
(20 citation statements)
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“…Nevertheless, an explicit correlation for individual ion activity coefficients depending on temperature, pressure and ionic strength has not yet been formulated. Alternatively some authors have made use of either the Pitzer model, Dickinson et al [1990], Haubrock et al [2005], or the electrolytes NRTL (eNRTL) model, Haghtalab et al [2004]. For simplicity in this work the latter model was chosen and Aspen Plus T M was used for estimating individual ion activity coefficients under actual reaction conditions, see table 1.…”
Section: Resultsmentioning
confidence: 99%
“…Nevertheless, an explicit correlation for individual ion activity coefficients depending on temperature, pressure and ionic strength has not yet been formulated. Alternatively some authors have made use of either the Pitzer model, Dickinson et al [1990], Haubrock et al [2005], or the electrolytes NRTL (eNRTL) model, Haghtalab et al [2004]. For simplicity in this work the latter model was chosen and Aspen Plus T M was used for estimating individual ion activity coefficients under actual reaction conditions, see table 1.…”
Section: Resultsmentioning
confidence: 99%
“…Some works have made use of the electrolytes NRTL (eNRTL) [16,39] and Pitzer model [10] for calculating the thermodynamic properties of the aqueous electrolyte systems. In this work, by applying the eNRTL model implemented in the commercial software Aspen Plus (V-7.2), the ion activity coefficients, dissociation constants and hydronium ion concentrations have been calculated for the different reaction solutions.…”
Section: Thermodynamicsmentioning
confidence: 99%
“…In this work, by applying the eNRTL model implemented in the commercial software Aspen Plus (V-7.2), the ion activity coefficients, dissociation constants and hydronium ion concentrations have been calculated for the different reaction solutions. An advantage of the eNRTL model is the temperature dependence of ion interaction parameters which is applicable from room temperature to 270 C [16]. The major ion concentrations of the different salt solutions were included in the model which were determined using ICP-OES elemental analysis as described above.…”
Section: Thermodynamicsmentioning
confidence: 99%
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“…Reasons include the partial dissociation of the bisulfate ion, the hydronium and bisulfate complex formation, the different extents of proton hydration (with respect to the initial H 2 SO 4 molality) and the partial dissociation of sulfuric acid at high concentrations (because of the elimination of free water). Attempts to model the sulfuric acid system have led to accurate thermodynamic representations of the system, [13][14][15][16][17] but these are deficient in the prediction of speciation. Considering the complexity of the aqueous sulfuric acid system and the large number of proton hydrates that can exist in this solution, 18 it is indeed an intriguing problem to predict the speciation.…”
Section: Introductionmentioning
confidence: 99%