Additive for reducing chromium (vi) to chromium (iii) ions
AssigneeChryso
InventorsPierre-Antoine Andreani, Bruno Pellerin, Karen Ayme
Life of this patent
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Abstract
The invention relates to an additive for reducing Cr(VI) ions to Cr(III) ions, comprising a complex of tin(II) and a carboxylic acid or a salt thereof, and to the process for the preparation thereof. It also relates to a process for preparing a material having a low chromium(VI) content. Finally, it relates to the use of said additive for reducing chromium(VI) ions to chromium(III) ions.
Claims15
-14. (canceled)
A process for preparing a material having a low chromium (VI) content including the step of bring the material into contact with an appropriate amount of an additive comprising an aqueous solution of a tin(II) complex comprising a carboxylic acid or a salt thereof to reduce Cr(VI) ions to Cr(III) ions.
Dependencies are inferred from the claim text.