Extraction of carbon dioxide from gas mixtures with amines absorbing process

Abstract

Currently one of the most efficient technologically and economically to extract CO2 from gas mixtures is the process of chemical absorption using amine absorbents. Choosing an effective absorbent that can be applied to all CO2 concentration range in gas mixtures can greatly improve the technical and economic indicators of CO2 absorption extraction systems from gases in general.The calculations were performed using the HYSYS software system. An efficient absorber based on methyldiethanolamine (MDEA) was proposed that can be used to extract CO2 from the various process gases in a broad range of CO2 concentration: from 9.3 % to 45.0 %.Application of the absorbent reduces the energy consumption for regeneration of the saturated sorbent solution up to 2.5 times in comparison with traditional monoethanolamine reduces for 30 % the sorbent consumption.The results of these researches are used to optimize the extraction processes of ozone-depleting carbon dioxide from the process gases and its realization as a commercial product. One of such gases is landfill gas that contains up to 40 % of CO2. Gas Institute of National Academy of Sciences of Ukraine is the leading Ukrainian technology developer of landfill gas processing. In Ukraine 5 projects for the processing of landfill gas into electricity were implemented with a total power of 6 MW.