Process for the preparation of anhydrous sodium sulfide

US6503474B1 · kind B1 · utility

Assignee

• Degussa AG · DE

Inventors

• Robert Magiera · Frankfurt, DE
• Hans Christian Alt · Gelnhausen, DE
• Gerhard Rasig · Hanau, DE
• Jorg Munzenberg · Hanau, DE
• Christoph Batz-Sohn · Hanau, DE
• Ralf Goedecke · Rodenbach, DE
• Ulrich Deschler · Bad Neuenahr-Ahrweiler, DE
• Volker Knapp · Oberursel, DE
• Karl-Heinz Rützel · Hürth, DE

Key dates

• Filing date: Aug 4, 2000
• Grant date: Jan 7, 2003
• Expiry date: Aug 4, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/38
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process is disclosed for the preparation of anhydrous sodium sulfide by heating sodium sulfide having a water content of from 38 to 40% in a contact drier in vacuo, the temperature of the solid to be dried being increased from approximately 20° C. at the solid inlet to ≧180° C. at the solid outlet.