| 摘要 |
An organic phase including both phosphoric acid and sulfuric acid is purified of sulfate ion content by countercurrently washing same with an aqueous liquid in an at least two-stage wash zone, the pH of which having been adjusted with an alkali metal or ammonium compound to a value greater than that as would exist if the washing were effected with the aqueous liquid alone, under the same conditions, and whereby there results a purified organic phase comprising both SO4 and P2O5 in an amount by weight of SO4 to P2O5 of less than 50 ppm. |
