Process for thermal decomposition of aluminum chloride hexahydrate

US4080437A · kind A · utility

Assignee

• Aluminum Pechiney · FR

Inventors

• Lothar Reh · Zumikon, CH
• Ludolf Plass · Kronberg, DE
• Hans-Werner Schmidt · Bayreuth, DE
• Gunter Schoene
• Philippe Marchessaux · Aix-en-Provence, FR

Key dates

• Filing date: May 20, 1976
• Grant date: Mar 21, 1978
• Expiry date: May 20, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S423/16
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Process for the thermal decomposition of aluminum chloride hexahydrate into anhydrous Al.sub.2 O.sub.3, comprising predrying and then decomposition in a fluidization reactor, the said fluidization being ensured by recycled gaseous HCl, and finally heating at the temperature necessary to obtain the desired crystallization state, namely anhydrous Al.sub.2 O.sub.3, the said pre-drying being carried out by the gases coming from this final heating.