Process flow for removing CO2 and H2S in gas mixture

Abstract

The present invention provides a process flow for removing CO2 and H2S in gas mixture. The invention is characterized in that the process flow satisfies the high recovery rate requirement to the effective component in the purifying process of the gas mixture which contains the impurities of CO2 and H2S, satisfies the high recovery rate requirement to the effective component in the purifying process of the gas mixture which comprises CO2 and H2S, and realizes the recovery of sulfur product and high-concentration CO2 thereby effectively increasing the economic and social benefit of the gas mixture purifier.

Description

technical field [0001] The invention relates to a method for removing CO from mixed gas 2 、H 2 The technological process of S is mainly used for the treatment of CO 2 、H 2 The comprehensive purification treatment of the mixed gas of S impurities is especially suitable for the comprehensive purification treatment of the shift gas in the production of synthetic ammonia and co-production of urea and the comprehensive purification treatment of the shift gas in the production of methanol. Background technique [0002] Contains CO 2 、H 2 The mixed gas of S, especially the shift gas in the production of synthetic ammonia and methanol, needs to remove the CO in order to meet the needs of subsequent processes 2 、H 2 S and other impurities. Due to the advantages of simple process, low investment, simple operation, low operating cost, and simultaneous removal of CO, pressure swing adsorption technology 2 、H 2 The characteristics of impurities such as S have been widely used, e...

AI Technical Summary

Problems solved by technology

Although this method is effective for shifting CO in the gas 2 The impurities were removed and recovered, but the H in the shift gas was not 2 S proposes a recycling plan, while H 2 S mixed with CO 2 Product gas also affects CO 2 Product gas purity and potential adverse effects on subsequent processes

Invention patent ZL200310104007.X and invention patent ZL01108694.7 also respectively provide a pressure swing adsorption decarburization method for synthetic ammonia shift gas in the production of synthetic ammonia and co-production of urea. 2 Purification and separation of effective components of hydrogen and nitrogen in the shift gas, but the two also have no effect on the H in the shift gas 2 S proposes a separate separation and recovery plan

First of all, the equipment investment is large. Due to the long process flow of the low-temperature methanol washing process and the derivative Claus process, a large number of absorption towers, flash towers, scrubbers, heat exchangers, burners, catalytic reactors, condensers, and various Pumps and refrigeration systems, etc., so require a large investment in equipment; secondly, due to the existence of a large number of mass transfer, heat transfer processes and multiple catalytic oxidation (or reduction) reaction processes, resulting in high energy consumption and consumption of reactants , resulting in higher unit operating costs; moreover, due to the technical limitations of the derivative Claus sulfur recovery process itself, it cannot be applied to H 2 Sulfur recovery treatment of gas with S content below 20%

[0005] In general, at present, there is no use of pressure swing adsorption to treat CO-containing gases such as shift gas at home and abroad. 2 、H 2 The mixed gas of S impurities is purified and CO is recovered at the same time 2 and technology reports on sulfur

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