Patent · US Active

Additive for reducing chromium (VI) to chromium (III) ions

US8361221B2 · kind B2 · utility

2Cited by

6References

11Claims

0Family size

Assignee

CHRYSO · FR

Inventors

Pierre-Antoine Andreani · Simpsonville, US
Bruno Pellerin · Avon, FR
Karen Ayme · Pithiviers, FR

Key dates

Filing date	Jul 6, 2009
Grant date	Jan 29, 2013
Priority date	—
Expiry date	Jan 23, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC04B2111/1081
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.