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.
Highlights
Wet process phosphoric acid is produced at the General Fertilizer Company G
Results showed that a mixture of diisopropyl ether (DIPE) and TBP in kerosene is an effective solvent for the extraction of phosphoric acid form the commercial wet acid salted out with sulfuric acid and sodium chloride
The results clearly demonstrate that diluents such as kerosene, benzene and toluene having low dielectric constants show higher extraction yield for phosphoric acid
Summary
Wet process phosphoric acid is produced at the General Fertilizer Company G. The present work was carried out to improve the overall yield of phosphoric acid extraction using TBP in kerosene after the addition of an optimized amount of some mineral acids.
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