Modeling of Phosphoric Acid Purification by Liquid-Liquid Extraction

Bendada, A.; Meniai, A.-H.; Bencheikh, L. M.

doi:10.1002/1521-4125(200112)24:12<1273::aid-ceat1273>3.3.co;2-a

Cited by 2 publications

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“…Phosphoric acid is the second most important mineral acid with a global production of 39.8 million tons in 2008 . It is mainly produced by the dihydrate process in which the enrichment of the acid by recycling evaporation is energy-intensive. , The trial of applying azeotropic distillation in dehydration of phosphoric acid has caused many concerns. − Some studies were performed by Tu and her colleagues, − including the VLE measurement of benzene/xylene/octane + water binary systems, − and the liquid–liquid equilibria (LLE) determination for phosphoric acid + water + benzene/octane ternary systems. , However, no VLE data for phosphoric acid containing systems were determined.…”

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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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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Efficient Extraction of Phosphoric Acid with a Trialkyl Amine-Based Solvent Mixture

et al. 2015

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Production of phosphoric acid by using wet process technology in China is challenging due to high impurities (P2O5 present is less than 25 wt %). Extraction of phosphoric acid from such low concentration mixtures needs to be improved. Moreover, the separation of chloride and phosphate ions is also important for the subsequent production of phosphate fertilizers. In this study, an organic solvent composed of trialkyl amine (N235), isoamyl alcohol, and sulfonated kerosene was developed to extract phosphoric acid. Pseudoternary phase equilibria, two phase densities, and the viscosities were determined at 298.15 K and atmospheric pressure. Results show that unlike other common organic solvents, the proposed solvent exhibits relatively higher extraction capacity even at low phosphoric acid concentration (P2O5 less than 25 wt %). The separation factor of chloride and phosphate ions reaches up to 39.45 and is several orders of magnitude lager than other common organic solvents including alcohols, cyclohexane, and tri-n-butyl phosphate (TBP). In addition, the solubility of organic solvent in the aqueous phase is close to zero, while the water content in the organic phase keeps nearly constant at a low concentration of around 5 wt %. All of these indicated that the developed solvent mixture is efficient for the extraction of phosphoric acid.

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Modeling of Phosphoric Acid Purification by Liquid-Liquid Extraction

Cited by 2 publications

References 0 publications

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

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

Efficient Extraction of Phosphoric Acid with a Trialkyl Amine-Based Solvent Mixture

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