Process for reducing molten ammonium sulfates containing metallic impurities to ammonia and sulfur dioxide

US4029745A · kind A · utility

Assignee

• Institut Francais du Petrole des Carburants et Lubricants et Enterprise de Recherches et d'Activities Petroliers Elf · FR

Inventors

• Claude Dezael · Maisons-Laffitte, FR
• Philippe Renault · Noisy-le-Roi, FR
• Andre Deschamps · Villepreux, FR

Key dates

• Filing date: Jul 21, 1975
• Grant date: Jun 14, 1977
• Expiry date: Jul 21, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B17/504
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Molten ammonium sulfates containing iron sulfate as an impurity may be reduced with sulfur or a sulfur compound over long periods provided a fraction of these impure ammonium sulfates is withdrawn, treated for iron removal and fed back to the reduction zone.