process for the manufacture of ammonium sulfate from an aqueous solution of ammonium sulfate, which contains substances

摘要

An improvement in a process for recovering ammonium sulfate from a contaminated, aqueous ammonium sulfate Solution containing both tarry organic and heavy contaminants (e.g., from Group VIII of the Periodic Table) is disclosed wherein a compound, or several compounds, which can form complexes together with said metal ions, and the solution is then treated with one, or several, water-soluble organic substances which, at least in combination with a saturated ammonium sulfate solution, are capable of forming a two-layer liquid phase system therewith. The resultant two layers may be separated into an aqueous phase containing purified ammmonium sulfate and an organic phase containing the organic substance, organic contaminants and metallic contaminants. The ammonium sulfate can be recovered as water-white, cubical crystals.