Process for decreasing the corrosiveness of a sour water

US5431877A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Volker Brucken · Eschborn, DE
• Gert Ungar · Frankfurt am Main, DE
• Hans-Martin Stonner · Eschborn, DE
• Ernst Stoldt · Heppenheim, DE
• Johann Schlauer · Schmallenberg, DE
• Nikola Anastasijevic · Schongau, DE
• Eilhard Hillrichs · Büdingen, DE

Key dates

• Filing date: Mar 2, 1994
• Grant date: Jul 11, 1995
• Expiry date: Mar 2, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S210/904
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

An aqueous solution which contains ammonium polysulfide is proportionally added to the sour water, which contains cyanide ions, ammonium ions, and sulfide ions. At least part of the cyanide ions contained in the sour water is converted to thiocyanate ions by the ammonium polysulfide. The solution which contains ammonium polysulfide is prepared from an aqueous solution by oxidation in an electrochemical cell. That aqueous solution may consist entirely or in part of sour water.