Extraction of phosphoric acid from various aqueous solutions using tributyl phosphate (TBP)

Abstract

Solvent extraction of phosphoric acid from various aqueous solutions has been investigated using tributyl phosphate in kerosene as the extractant. The effect of the nature of the diluent on the extraction of phosphoric acid with TBP has been studied and correlated with the dielectric constant. The extraction equilibrium curve showed that an overall extraction yield of more than 80 % could be reached from aqueous solutions containing 0.8M of sulfuric acid. Pure phosphoric acid was stripped from the loaded organic phase by counter current stripping with distilled water. The produced acid was post treated to eliminate the co-extracted acids and characterized. Keywords phosphoric acid • TBP • extraction Acknowledgement The author would like to express his thanks to General Director of the Syrian Atomic Energy Commission Prof. I. Othman and Prof. G. Zayzafoon Head of the Chemistry Department for their encouragement to carry out this work and to Mr. H. Shlewit for his valuable discussion. The author would like to extend his thanks to Ms. S. Alike and Mr. A. Rezkalah for their valuable help to carry out this work.

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

“…The extraction of H 3 PO 4 by TBP has been investigated by various authors. 42,45,46,[76][77][78] As can be seen in Fig. 1, the extraction of H 3 PO 4 by TBP is much more gradual than with DiPE or DBE, as extraction is effective even from diluted phosphoric acid solution.…”

Simulation of the Wet Phosphoric Acid Extraction along a Continuous Column

“…Combining equation 3and 4gives the 1 rt order differential system: (6) In the previous equation, Kc, is relative the driving force expressed in Bancroft coordinates. The differential problem has to be solved with the following initial and boundary conditions:…”

“…Techniques such as precipitation, adsorption, ion exchange and solvent extraction were used for the purpose of purifying the industrial phosphoric acid. Of these WPA purifying techniques, liquid-liquid extraction is the most widely used [3][4][5][6][7][8][9][10]. The employed solvents have a relatively excellent selective H 3 PO 4 extraction capability.…”

Investigation of a novel ionic liquid, Cyphos IL 104 for the solvent extraction of mineral acids

“…In the solvent extraction, basic or neutral extractants such as tris-(2-ethylhexyl) amine (TEHA), tri-octyl/decylamine (Alamine 336), Tri-n-butyl phosphate (TBP), Trioctyl methylammonium chloride (Aliquat 336), tri-n-octylphosphine oxide (Cyanex 923) etc. are generally used for the extraction of mineral acids (Alguacil and Lopez, 1996;Gottliebsen et al, 2000;Sarangi et al, 2006;Alibrahim, 2007;Agrawal et al, 2008;Agrawal and Sahu, 2009;Haghshenas et al, 2009). Although the conventionally used extractants are highly efficient for the extraction of acids, in the presence of metal ions selectivity of the acid extraction decreases substantially as the metal ions often get extracted as their anionic complexes (Sinha et al, 2014).…”