Separation of phosphoric acid and nitric acid mixtures with tri-n-butyl phosphate at 303.2K

Ren, Yongsheng; Cheng-qi, Liu; Zhao, Han; Lv, Linyu; Li, Yang

doi:10.1016/j.fluid.2015.03.010

Cited by 8 publications

(4 citation statements)

References 23 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The total concentration of nitric acid in the aqueous phase was measured by acid–base neutralization titration with an automatic titrator. , The concentration of calcium in the aqueous phase was determined by EDTA titration . The concentration of water in the organic phase was measured with a Karl Fischer titrator. − The concentration of water in the aqueous phase and the concentrations of calcium nitrate and nitric acid in both phases were calculated by a material balance. , Three parallel samples were carried out, with standard deviations below 0.15% for Ca(NO 3 ) 2 in the aqueous phase and 0.2% for water in the organic phase, and the average values were taken as the results in each experiment. The mass was measured with an analytical balance, and the measuring accuracy is ±0.0001.…”

Section: Methodsmentioning

confidence: 99%

Liquid–Liquid Equilibrium in the Nitric Acid + Calcium Nitrate + Water + Tri-n-octylamine System

Cao

et al. 2021

J. Chem. Eng. Data

View full text Add to dashboard Cite

In this paper, liquid−liquid equilibrium (LLE) data of the quaternary system nitric acid + calcium nitrate + water + tri-n-octylamine (TOA) was investigated at 298.15 K and under atmospheric pressure for different mass percentages of nitric acid and calcium nitrate in the initial aqueous phase. The densities of aqueous phase (ρ a ) and organic phase (ρ o ) were measured. The distribution coefficients of nitric acid (D 1 ) and water (D 3 ) and the separation factor of nitric acid against calcium nitrate (β 2 1 ) were calculated. Based on these experimental and calculated data, the selectivity and capability of TOA for extracting nitric acid were evaluated. The reliability of LLE data was tested by Hand and Othmer−Tobias equations. Both of the equations showed good linear correlations. The electrolyte non-random two-liquid (eNRTL) model was used to correlate the experimental data, and the binary interaction parameters and pair parameters were determined. The root-mean-square error value (1.29%) was calculated for the eNRTL model, indicating that the excellent results for this model were suitable to determine the LLE data of this quaternary system.

show abstract

Section: Methodsmentioning

confidence: 99%

Liquid–Liquid Equilibrium in the Nitric Acid + Calcium Nitrate + Water + Tri-n-octylamine System

Cao

et al. 2021

J. Chem. Eng. Data

View full text Add to dashboard Cite

show abstract

“…Some studies have reported the LLE data in the system consisted of phosphoric acid and nitric acid. Ren et al 9 obtained the LLE data of quaternary system, including phosphoric acid, nitric acid, water, and TBP at 303. Jia et al 18 studied the LLE of nitric acid + phosphoric acid + water + TOA at 298.15 K. Our previous studies have determined the LLE data of the nitric acid + calcium nitrate + water + TOA system at 298.15 K. 19 However, no effect of two high-content components in the acidolysis product (phosphoric acid and calcium nitrate) on the extraction of nitric acid by TOA has been reported, and no LLE data for the system nitric acid + phosphoric acid + calcium nitrate + water + TOA has been found in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…It must be purified to yield relatively pure phosphoric acid. Acid-insoluble substances can be separated by filtration, while soluble substances can be separated by crystallization, chemical precipitation, ion exchange, or solvent extraction. − Among them, the solvent extraction method is the most widely utilized. To separate phosphoric acid or nitric acid, a variety of extractants have been used.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Liquid Equilibria of the System Nitric Acid + Phosphoric Acid + Calcium Nitrate + Water + Tri-n-Octylamine at 298.15 K

Cao

Dong

et al. 2023

J. Chem. Eng. Data

View full text Add to dashboard Cite

Liquid−liquid equilibrium (LLE) data of the system nitric acid + phosphoric acid + calcium nitrate + water + tri-n-octylamine (TOA) were measured at 298.15 K and atmospheric pressure. The distribution coefficients of nitric acid, phosphoric acid, calcium nitrate, and water and the separation factors of nitric acid against phosphoric acid, nitric acid against calcium nitrate, and nitric acid against the water were calculated. Based on these data, the capability and selectivity of TOA for extracting nitric acid in this system were evaluated. The experimental results were used to obtain binary interaction parameters and pair parameters as correlated by the electrolyte non-random two-liquid (eNRTL) model. The eNRTL model was shown to be suitable for predicting the LLE data of this system, with a rootmean-square deviation of just 1.17%.

show abstract

“…Wet process phosphoric acid (WPA) is produced by decomposition of phosphate rock with mineral acid which is thus far acknowledged as a more economical, environmental-friendly method of production. 1,2 However, WPA is accompanied by a number of undesirable impurities beside solids and organic matters so that purification must be conducted during the downstream production. Several physicochemical treatment techniques have been investigated for purifying WPA 580 L I et al including adsorption, crystallization, ion exchange, ion precipitation and solvent extraction.…”

Section: Introductionmentioning

confidence: 99%

Wet process of phosphoric acid purification by solvent extraction using tri-n-butyl phosphate and cyclohexanol mixtures

Jun

Jin

et al. 2017

J Serb Chem Soc

View full text Add to dashboard Cite

Solvent extraction is an efficient, economical and widely-used technology for the purification of wet process phosphoric acid (WPA). This present work focused on the development of a solvent extraction system, TC, representing tri-n-butyl phosphate (TBP) and cyclohexanol mixtures. The equilibrium phase diagram of the system H 3 PO 4 −H 2 O−TC at 298.2 K and atmospheric pressure was obtained. The effects of extraction time, phosphoric acid concentration, extractant concentration, temperature and phase volume ratio on extraction efficiency were studied. The extracted complexes were estimated to be 1.8H 3 PO 4 2TC. The extraction process of H 3 PO 4 was exothermic and the enthalpy change, ΔH, was obtained. The solvent mixtures had a high efficiency for phosphoric acid purification via multi-stage counter-current extraction from the industrial WPA in a reciprocating plate extraction column with an H 3 PO 4 extraction yield of 85.08 % at 313.2 K. The stability, extraction efficiency and recycling capability of TC for H 3 PO 4 extraction were also estimated.

show abstract

Separation of phosphoric acid and nitric acid mixtures with tri-n-butyl phosphate at 303.2K

Cited by 8 publications

References 23 publications

Liquid–Liquid Equilibrium in the Nitric Acid + Calcium Nitrate + Water + Tri-n-octylamine System

Liquid–Liquid Equilibrium in the Nitric Acid + Calcium Nitrate + Water + Tri-n-octylamine System

Liquid–Liquid Equilibria of the System Nitric Acid + Phosphoric Acid + Calcium Nitrate + Water + Tri-n-Octylamine at 298.15 K

Wet process of phosphoric acid purification by solvent extraction using tri-n-butyl phosphate and cyclohexanol mixtures

Contact Info

Product

Resources

About