Continuous Purification of Wet-Process Phosphoric Acid via Microchannel

Document Type : Research Article


1 Department of Chemical Engineering, Faculty of Energy, Kermanshah University of Technology, Kermanshah, I.R. IRAN

2 Research Center of Oils and Fats, Kermanshah University of Medical Science, Kermanshah, I.R. IRAN


Solvent extraction is an economically efficient method widely used in the purification of wet phosphoric acid. In this study, a microchannel was applied to promote the mixing and purification of phosphoric acid during continuous production. For this aim, solvent extraction was conducted to purify phosphoric acid via methyl isobutyl ketone/tri-butyl phosphate mixtures. Additionally, the Box-Behnken design method was used to survey the solvent extraction process. The effect of various operational parameters such as solvent concentration (45–65 %wt.), temperature (18-28˚C), and organic/aqueous phase ratio (2:1–6:1) at a constant flow rate of 70 mL/L was examined. Experimental results indicated that the microchannel at the residence time of 6.85 min could promote the extraction percentage of and sulfate removal of more than 98% and 60%, respectively, compared to the batch extractor.


Main Subjects

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