Method for treating a process gas flow containing CO2

Abstract

The invention relates to a method for treating a process gas flow containing CO2 that is produced whilst producing pure synthesis gas from the crude gas of the process gas flow or during the partial oxidation of heavy olis, petroleum cokes and waste substances or during coal gasification or during the treatment of natural gas or gas which accompanies petroleum, from which CO2 is removed by physisorption or chemisorption and the solvent charged with CO2 is released at a low pressure for the desorption of the CO2. In order to produce CO2 as pure as possible, the unpurified CO2 is compressed at least at 60 bar[a] or below the critical temperature thereof to at least 70 bar[a] and the impurities contained in the liquid CO2 are removed by stripping with gaseous CO2 guided into the counter flow.

Description

technical field [0001] The present invention relates to a method for treating 2 method of process gas stream that contains CO 2 The process gas stream is obtained during the production of pure synthesis gas from crude gases such as partially oxidized crude gases of heavy oil, petroleum coke or waste, either in the gasification of coal, or in the treatment of Natural gas or petroleum associated gas obtained by physical or chemical absorption from which contains CO 2 CO removal from the process gas stream 2 , will be loaded with CO 2 The solvent is decompressed to a lower pressure, thereby desorbing CO 2 . Background technique [0002] by name and hot potash wash Known processes are used for the production of pure synthesis gas from crude gases, which are partially oxidized crude gases of heavy oils, petroleum coke or waste materials, or from the gasification of coal, or from the processing of natural gas or petroleum-associated gas. [0003] exist In the pro...

AI Technical Summary

Problems solved by technology

[0005] In order to remove unwanted components CO, H contained in crude gas as follows 2 O, H 2 S, COS, HCN, NH 3 , organosulfur compounds, metal carbonyl compounds and hydrocarbons, the crude gas is from the partial oxidation of heavy oil, petroleum coke and waste, from the gasification of coal and from the processing of natural gas and petroleum associated gas, the above through physical absorption and chemical The disadvantage of the absorption method by absorption is that the CO produced 2 still contain 0.1 to 20% by volume, especially 0.5 to 2.5% by volume, of one or more components N 2 , CO, H 2 and CH 4 , and are therefore not suitable for many applications

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