Process and apparatus for purifying an aqueous solution which contains ammonium sulfate, ammonium nitrate and organic compounds

摘要

The invention relates to a process and an apparatus for purifying an aqueous solution which contains ammonium sulfate, ammonium nitrate and organic compounds, which process involves oxidation of at least part of the organic compounds in the aqueous solution, wherein the oxidation is effected in the presence of hydrogen peroxide and ions of a transition metal. The process is in particular suitable for purifying a mother liquor obtained in a crystallization process in which crystallization of ammonium sulfate is effected, said mother liquor containing ammonium sulfate and ammonium nitrate.