Abstract
Liquid-liquid solvent extraction technology is used in several industrial processes such as petrochemical processing, pharmaceutical production, food and hydrometallurgy. It is successfully applied for the purification of Wet Phosphoric Acid (WPA) with fairly good purification performances. The purification process is basically carried out in three steps: extraction, washing and recovery, each of these steps is a liquid-liquid extraction operation. The aim was to develop a computer code that helps predicting the overall performance of the purification process for a given set of operating conditions. The adopted approach is based on determining the necessary theoretical stages for each step in the purification process using a numerical technique. Some simulation results for the WPA purification process with Tri-Butyl Phosphate (TBP) at 45°C, Methyl Isobutyl Ketone (MIBK) at 25°C and a mixture (MIBK+TBP) at 30°C are presented.
Highlights
The most commonly used process for the production of phosphoric acid is: thermal and wet-process
On the basis of experiment undertaken to a scale laboratory, this study proposes to exploit the equilibriums isotherms to develop a computer code for the simulation of the operation of purification of Wet Phosphoric Acid (WPA)
The Number of Theoretical Stages’ (NTS) is an important parameter for the dimensioning of the equipments used in the purification process
Summary
The most commonly used process for the production of phosphoric acid is: thermal and wet-process. The thermal process produces a pure acid with huge energy consumption. The wet-process involves reaction of phosphate rock with an acid (mainly sulfuric acid). This process is economic and practiced everywhere in the world [1,2]. Phosphoric acid produced by the latter process contains a variety of impurities, which vary according to the origin of the minerals. These impurities are removed from the acid by several techniques such as precipitation, adsorption, ion exchange and solvent extraction [1-12]
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