Purification of wet phosphoric acid using modified activated carbon

Monser, Lotfi; Amor, Mohamed Ben; Ksibi, Mohamed

doi:10.1016/s0255-2701(99)00008-2

Cited by 70 publications

(36 citation statements)

References 5 publications

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“…There are two main strategies for purifying phosphoric acid: (i) the elimination of the impurities or (ii) the selective extraction of H 3 PO 4 . Most of the oldest methods belong to the rst category and are based on the precipitation of insoluble salts, even if the recovery of specic elements such as uranium attracts increasing attention.…”

Section: Adsorptionmentioning

confidence: 99%

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Phosphoric acid recovery from concentrated aqueous feeds by a mixture of di-isopropyl ether (DiPE) and tri-n-butylphosphate (TBP): extraction data and modelling

et al. 2017

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This paper reports experimental data about the extraction of phosphoric acid from concentrated aqueous feeds (3 to 14 M H 3 PO 4 ) by the mixture of di-isopropyl ether (DiPE) and tri-n-butylphosphate (TBP) at 25 C:distribution ratios of H 3 PO 4 and water, and change of phase volume ratio during extraction. Then, a simple model based on the extraction isotherms of H 3 PO 4 and water as well as on the mass balance of these two compounds is developed in the case of the mixture of 90% wt DIPE and 10% wt TBP that corresponds to the solvent used at the industrial scale for the production of purified phosphoric acid.

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Section: Adsorptionmentioning

confidence: 99%

“…67 The set of mass balance equations for the calculation of the extraction equilibria was solved by the Powell method implemented in Scilab©. 4 and the associated modications of the structure of the aqueous solution implies that phosphoric acid is less and less retained in the latter by hydrogen bonding with water.…”

Section: Computingmentioning

confidence: 99%

Phosphoric acid recovery from concentrated aqueous feeds by a mixture of di-isopropyl ether (DiPE) and tri-n-butylphosphate (TBP): extraction data and modelling

et al. 2017

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“…Assuming that phosphoric acid transfers into the organic phase in a neutral form and exists in the organic phase as a complex of the form pH 3 …”

Section: The Extracted Complexmentioning

confidence: 99%

“…Wet process phosphoric acid (WPA) is a more economical and environmental-friendly method of phosphoric acid production [1][2][3]. However, WPA contains various undesirable impurities and must be purified during the downstream production.…”

Section: Introductionmentioning

confidence: 99%

Purification of Wet Process Phosphoric Acid by Solvent Extraction using Cyclohexanol

Jian

et al. 2017

SERDJ

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Solvent extraction using organic solvents is an important technology for the purification of wet process phosphoric acid (WPA). In this study, the purification process of WPA, using a new type of solvent extraction system, cyclohexanol diluted in kerosene, was investigated. The equilibrium phase diagram of the system H 3 PO 4 H 2 O solvent mixtures at 313.2K was obtained. The effects of extraction time, phosphoric acid concentration, cyclohexanol concentration, temperature, phase ratio on extraction efficiency were studied. The extracted species was shown to be 2H 3 PO 4 · 2C 6 H 12 O. The extraction process of H 3 PO 4 is exothermic and the enthalpy change, H, was obtained. Via a cross-current three-stage extraction, the solvent mixtures have a high efficiency for phosphoric acid purification from the actual industrial WPA with an H 3 PO 4 extraction yield of 90.2% at room temperature. The study is capable of enriching theoretical foundation and technical guidance for the phosphoric acid purification process.

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“…Ferric iron is one of the most troublesome impurities, and it can increase the viscosity of the WPA, thus decreasing its quality. In the published literature, several purification methods have been developed to remove ferric iron from WPA, such as precipitation [5], adsorption [6][7], membrane separation [8], solvent extraction [9][10][11][12], ion-exchange and so on. Nowadays, solvent extraction has become the main purification method to remove ferric iron from WPA.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-assisted Extraction of Fe (III) from Wet-process Phosphoric Acid

Liu

et al. 2017

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An ultrasound-assisted extraction (UAE) method was developed for the extraction of Fe (III) from wet-process phosphoric acid with di (2-ethylhexyl) phosphoric acid (D2EHPA). The influences of UAE parameters, including ultrasonic power, extraction time, concentration of D2EHPA and extraction temperature, were systematically studied. The response surface methodology, a statistical technique, was used to obtain the optimal conditions and evaluate the significance of variables affecting the extraction efficiency of the UAE. It was found that ultrasound could markedly improve the extraction rate of Fe (III) with D2EHPA, the largest improvement is up to 7 times compared with the traditional solvent extraction method. However, the extraction equilibrium of the extraction system was not affected by ultrasound. It is believed that the cavitation effect of ultrasound, along with the increased interfacial surface area, contribute to the enhancement of the extraction rate.

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Purification of wet phosphoric acid using modified activated carbon

Cited by 70 publications

References 5 publications

Phosphoric acid recovery from concentrated aqueous feeds by a mixture of di-isopropyl ether (DiPE) and tri-n-butylphosphate (TBP): extraction data and modelling

Phosphoric acid recovery from concentrated aqueous feeds by a mixture of di-isopropyl ether (DiPE) and tri-n-butylphosphate (TBP): extraction data and modelling

Purification of Wet Process Phosphoric Acid by Solvent Extraction using Cyclohexanol

Ultrasound-assisted Extraction of Fe (III) from Wet-process Phosphoric Acid

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