Flue gas purification process

US4873065A · kind A · utility

Assignee

• Kernforschungszentrum Karlsruhe GmbH · DE

Inventors

• Hartmut Braun · Karlsruhe, DE
• Hubert Vogg · Karlsruhe, DE

Key dates

• Filing date: Apr 22, 1987
• Grant date: Oct 10, 1989
• Expiry date: Apr 22, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Improved flue gas purification process features a heavy metal separating process, such as an anion exchange process, in which a scrubbing condensate is treated to remove at least the Hg contained therein prior to extracting the flue ash, which was previously separated and collected, with the scrubbing condensate to extract soluble heavy metals therefrom. A further heavy metal separating process, such as a cation exchange process, in which the scrubbing condensate after the extraction step is treated to remove at least one of Cd and Zn contained therein is also featured and may be performed after the extraction step or after solid/liquid separation of the flue ash and condensate from the extraction step.