METHOD FOR TREATING A PROCESS GAS FLOW CONTAINING CO2

摘要

Method for treating a process gas stream containing carbon dioxide during the production of pure synthesis gas from crude gas as a result of the partial oxidation of heavy oils, petroleum coke or waste products comprises compressing carbon dioxide contaminated with 0.1-20 vol.% nitrogen, carbon monoxide, hydrogen and methane at room temperature to a pressure of at least 60 bar or below the critical temperature of carbon dioxide to a pressure of at least 70 bar and removing the impurities contained in the carbon dioxide by stripping the carbon dioxide with carbon dioxide fed in a counter current manner. Preferred Features: The carbon dioxide is compressed to a pressure of 10-30 bar and cooled to a temperature of -40 to -5[deg] C. Stripping gas loaded with nitrogen, carbon monoxide, hydrogen and methane is added to the crude gas.