Process for the preparation of iridium acetate

US7951969B2 · kind B2 · utility

Assignee

• UMICORE AG & CO. KG · DE

Inventors

• Ralf Karch · Kleinostheim, DE
• Bernd Kayser · Munich, DE
• Andreas Rivas-Nass · Schriesheim, DE
• Jürgen Bodo Widmer · Darmstadt, DE
• Roland Winde · Frankfurt, DE
• Eileen WÖRNER · Maintal, DE

Key dates

• Filing date: May 24, 2006
• Grant date: May 31, 2011
• Expiry date: Sep 27, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/412
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of indium acetate comprising the steps: (a) reacting an indium compound with an alkaline compound in a protic solvent to obtain an iridium containing precipitate, where the reaction is conducted in the presence of at least one component (i) selected from oxalic acid, a salt of oxalic acid, formic acid and a salt of formic acid, (b) reacting the precipitate in the presence of at least (i) one compound selected from oxalic acid, a salt of oxalic acid, formic acid and a salt of formic acid, and (ii) CH3CO2H and/or CH3(CO)O(CO)CH3 to give an iridium acetate containing solution. The invention also relates to indium acetate having a low halide content, to an indium containing precipitate and to uses of the iridium containing precipitate of the present invention and the iridium acetate of the present invention.