Continuous Purification of Wet-Process Phosphoric Acid via Microchannel

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 (۴۵–۶۵ %wt.), temperature (۱۸-۲۸˚C), and organic/aqueous phase ratio (۲:۱–۶:۱) at a constant flow rate of ۷۰ mL/L was examined. Experimental results indicated that the microchannel at the residence time of ۶.۸۵ min could promote the extraction percentage of and sulfate removal of more than ۹۸% and ۶۰%, respectively, compared to the batch extractor.

کلیدواژه ها:

Solvent extraction ، Microchannel ، Purification ، Wet-process phosphoric acid