Method for treating a process gas flow containing CO2

US8641802B2 · kind B2 · utility

Assignee

• Lurgi GmbH · DE

Inventors

• Ulrich Koss · Darmstadt, DE
• Manfred Meyer · Friedrichsdorf, DE
• Alexander Schriefl · Scheinfeld, DE

Key dates

• Filing date: Sep 5, 2008
• Grant date: Feb 4, 2014
• Expiry date: Jan 25, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/151
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

From the CO2-containing stream of process gas obtained in a process for the treatment of a CO2-containing stream of process gas, which is obtained in the production of pure synthesis gas from raw gas in the partial oxidation of heavy oils, petroleum coke or wastes, or in the gasification of coal, or when processing natural gas or accompanying natural gas, CO2 is removed physisorptively or chemisorptively, and the solvent loaded with CO2 is expanded to a lower pressure for the desorption of CO2. In order to generate CO2 as pure as possible, the contaminated CO2 is condensed to at least 60 bar[a] or below its critical temperature to at least 70 bar[a], and the impurities contained in the liquid CO2 are removed by stripping with gaseous CO2 guided in counterflow.