Modeling of excess properties and vapor–liquid equilibrium of the system H3PO4–H2O

Messnaoui, Brahim; Bounahmidi, Tijani

doi:10.1016/j.fluid.2005.08.002

Cited by 20 publications

(10 citation statements)

References 22 publications

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“…The boiling point of pure phosphoric acid is 217 • C (Weast, 1988). However, the boiling point of phosphoric acid solution decreases as the concentration of phosphoric acid in the solution decreases (Messnaoui & Bounahmidi, 2005). The boiling point is only 108 • C when phosphoric acid concentration is 36 wt% P 2 O 5 , which is the designated concentration in the manufacturing process.…”

Section: Product Filter Floorsmentioning

confidence: 99%

Size distribution, chemical composition and acidity of mist aerosols in fertilizer manufacturing facilities in Florida

Hsu

Lundgren

et al. 2008

Journal of Aerosol Science

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Section: Product Filter Floorsmentioning

confidence: 99%

Size distribution, chemical composition and acidity of mist aerosols in fertilizer manufacturing facilities in Florida

Hsu

Lundgren

et al. 2008

Journal of Aerosol Science

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“…The thermodynamic properties of systems containing phosphoric acid have been researched broadly through the years. Pitzer model, 19 the extended UNIQUAC model, 20 and the electrolyte nonrandom two-liquid (electrolyte NRTL) model 21 are the activity coefficient models widely adopted. By using the electrolyte NRTL model, Messnaoui and Bounahmidi 21 successfully estimated the VLE for the phosphoric acid solution and the activity of undissociated H 3 PO 4 for concentrations up to 36 mol•kg −1 at various temperatures.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Pitzer model, the extended UNIQUAC model, and the electrolyte nonrandom two-liquid (electrolyte NRTL) model are the activity coefficient models widely adopted. By using the electrolyte NRTL model, Messnaoui and Bounahmidi successfully estimated the VLE for the phosphoric acid solution and the activity of undissociated H 3 PO 4 for concentrations up to 36 mol·kg –1 at various temperatures. Messnaoui also simulated the phosphoric acid concentration process with a good result, using the electrolyte NRTL model to calculate the activity coefficients of species in the aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Determination and Correlation of Vapor–Liquid Equilibria for the Phosphoric Acid + Water + Cyclohexane + Ethanol System

2017

J. Chem. Eng. Data

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The production of phosphoric acid by wet processes is quite energy consuming. The adoption of azeotropic distillation in the evaporation process, using cyclohexane as an entrainer, may be potentially economical. The vapor–liquid equilibria (VLE) data were determined by ebulliometric method for the following systems at 20, 40, 60, 80, and 101.3 kPa: (1) phosphoric acid + water + ethanol; (2) phosphoric acid + water + cyclohexane + ethanol; (3) phosphoric acid + water + cyclohexane. The electrolyte NRTL parameters for the following pairs were correlated from the VLE data by using Aspen Plus as a tool: H3PO4–H2O, H+[H2PO4]−–H2O, H3PO4–C2H6O, H3PO4–C6H12, and H+[H2PO4]−–C6H12. The VLE data and the obtained parameters may provide basic data for the enhancement of phosphoric acid by azeotropic distillation.

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“…To further improve the modeling results, more recent investigations have also considered the formation of H 5 P 2 O 8 − in a second reaction step. 7 Held and Sadowski 8 combined an ion-pair formation mechanism with the ePC-SAFT framework to describe the mean ionic activity coefficients and the densities of weak electrolyte solutions. In all of these approaches, except in the approach of Platford, the speciation of electrolytes as well as their molecular interactions were taken into account for the modeling.…”

Section: ■ Introductionmentioning

confidence: 99%

“…On the basis of the Pitzer equation, Pitzer and Silvester considered at least the first dissociation step of H 3 PO 4 into H + and H 2 PO 4 – . To further improve the modeling results, more recent investigations have also considered the formation of H 5 P 2 O 8 – in a second reaction step . Held and Sadowski combined an ion-pair formation mechanism with the ePC-SAFT framework to describe the mean ionic activity coefficients and the densities of weak electrolyte solutions.…”

Section: Introductionmentioning

confidence: 99%

Osmotic Coefficients of Aqueous Weak Electrolyte Solutions: Influence of Dissociation on Data Reduction and Modeling

2012

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The experimental determination and modeling of osmotic coefficients in electrolyte solutions requires knowledge of the stoichiometric coefficient ν(i). In contrast to strong electrolytes, weak electrolytes exhibit a concentration-dependent stoichiometric coefficient, which directly influences the thermodynamic properties (e.g., osmotic coefficients). Neglecting this concentration dependence leads to erroneous osmotic coefficients for solutions of weak electrolytes. In this work, the concentration dependence of the stoichiometric coefficients and the influence of concentration on the osmotic coefficient data were accounted for by considering the dissociation equilibria of aqueous sulfuric and phosphoric acid systems. The dissociation equilibrium was combined with the ePC-SAFT equation of state to model osmotic coefficients and densities of electrolyte solutions. Without the introduction of any additional adjustable parameters, the average relative deviation between the modeled and the experimental data decreases from 12.82% to 4.28% (osmotic coefficients) and from 2.59% to 0.89% (densities) for 12 phosphoric and sulfuric systems compared to calculations that do not account for speciation. For easy access to the concentration-dependent stoichiometric coefficient, estimation schemes were formulated for mono-, di-, and triprotic acids and their salts.

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Modeling of excess properties and vapor–liquid equilibrium of the system H3PO4–H2O

Cited by 20 publications

References 22 publications

Size distribution, chemical composition and acidity of mist aerosols in fertilizer manufacturing facilities in Florida

Size distribution, chemical composition and acidity of mist aerosols in fertilizer manufacturing facilities in Florida

Determination and Correlation of Vapor–Liquid Equilibria for the Phosphoric Acid + Water + Cyclohexane + Ethanol System

Osmotic Coefficients of Aqueous Weak Electrolyte Solutions: Influence of Dissociation on Data Reduction and Modeling

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