Process and integrated plant for the treatment of the carbon oxides formed in the production of aluminum

US12351926B2 · kind B2 · utility

Assignees

• BASF SE
• thyssenkrupp AG · DE
• thyssenkrupp Uhde GmbH · DE

Inventors

• Frederik Scheiff · Ludwigshafen, DE
• Marc Leduc · Speyer, DE
• Andreas Bode · Bellevue, US
• Karsten Bueker · Dortmund, DE
• Nicolai Antweiler · Essen, DE

Key dates

• Filing date: May 28, 2020
• Grant date: Jul 8, 2025
• Expiry date: May 4, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B2203/061
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process can be used for the treatment of an offgas stream, which is formed in a plant for the production of aluminum by electrolytic reduction of aluminum oxide in a melt, using at least one anode composed of a carbon-containing material. The offgas stream contains carbon oxides due to the reduction of the aluminum oxide by the carbon. At least a substream of the carbon oxides contained in the offgas stream is reacted with hydrogen or mixed with a hydrogen stream and is subsequently passed to a use. After purification and conditioning of the offgas stream in a device, an enrichment, for example with carbon monoxide, can subsequently be carried out in a reactor and the synthesis gas obtained in this way can be fed to a chemical or biotechnological plant for the synthesis of chemicals of value.