Abstract
The Purification of phosphoric acid used several extractants from the family of oxygenates, sulfurous or amino compounds. In this work, we were interested in the synthesis, physico-chemical and spectroscopic characterization, and use of the product C11H18N2O as an extractant of cadmium from phosphoric acid. The synthesized product was characterized by: infrared spectroscopy, nuclear magnetic resonance, and mass spectroscopy. Solubility tests in different solvents have been carried out. Subsequently, liquid-liquid extraction of cadmium from phosphoric acid was carried out using C11H18N2O as an extractant diluted in benzene. The study investigated the influence of concentration of phosphoric acid and the extracting agent. The result obtained ensure that our synthesized product is promising. The percentage of cadmium extraction from phosphoric acid reached 98.58% at a concentration of 2.5M phosphoric acid and an optimal concentration of 0.5×10-2 M of synthesized extractant.
Highlights
Phosphoric acid is a basic intermediate compound in sensitive industrial fields such as; pharmaceuticals, food, detergents and fertilizers
H3PO4 is mainly manufactured by wet process, where phosphates are solubilized by mineral acids, which often gives a product contaminated with several heavy metals
Kherfan [2] pointed out that the extraction of cadmium from phosphoric acid could be performed with the solvent trioctyl phosphine oxide (TOPO) diluted in kerosene
Summary
Phosphoric acid is a basic intermediate compound in sensitive industrial fields such as; pharmaceuticals, food, detergents and fertilizers. H3PO4 is mainly manufactured by wet process, where phosphates are solubilized by mineral acids, which often gives a product contaminated with several heavy metals. Several methods were evaluated for the purification of phosphoric acid from heavy metals and in particular the removal of cadmium by liquid-liquid extraction by different extracting agents. Kherfan [2] pointed out that the extraction of cadmium from phosphoric acid could be performed with the solvent TOPO (trioctyl phosphine oxide) diluted in kerosene. Nazari [4] studied the extraction of industrial phosphoric acid from the wet process (WPA), using the Alamine 336 as extracting agent that represent a mixture of : trin-octylamine, trin-decylamine, TBP, D2EHPA, and TOPO diluted in 1,2,4-trimethylbenzene/kérosène with the addition of iso-dodecanol in the organic phase. The extraction yield of cadmium from phosphoric acid reached is 68.57% after 20 cycles of the organic phase
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