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Abstract
3-Pentanone (DEK.) is used in this work for the purification of wet process phosphoric acid (WPA) by extraction. The study of impurities (Fe, Al, Mg, SO4 = and F¯ ) distribution between the conjugated phases generated shows that DFY. is very similar to isoamyl alcohol (iA) regarding its purification behavior. A review of the purification capability of all the solvents studied before is also presented. We have found a relation between the total impurities extracted and the amount of water plus phosphoric acid present in the organic phase. This relation would allow to predict the purification behavior of any solvent just from the data for the pure components.