Advances in atmospheric gas-phase reactions initiated by amine absorbent escape
Carbon capture chemical absorption(CCA)is currently the most promising technology for reducing CO2 emissions from power plants and other fossil fuel-using industries,but fugitive emissions of amine absorbents from CCA systems can trigger a range of atmospheric chemical reactions.During the operation of CCS,the amine absorbent is emitted into the atmosphere in the form of liquid droplets,gaseous and aerosol particles,and thus triggering atmospheric gas-phase reactions.The reaction between amine absorbent and OH radical mainly involves—CH2 group and H-extraction reaction between C—H bonds.A small amount occurs between N—H bonds,and a very small portion occurs between—OH groups,generating imines,aldehydes,etc.The reaction with Cl radical involves—CH2 group,—NH2 group and—OH group,generating nitrogen oxides,HCl,etc.The reaction with NO,includes the extraction of amino or alkyl groups.Hydrogen reaction,and the addition reaction with unsaturated compounds to generate nitric acid,nitramine,nitrosamines,etc.The reaction between amines and ozone mainly produces amides,isocyanates,nitroso compounds and so on.These compounds are potentially harmful to both the atmospheric environment and human health,and may cause serious impacts on air quality and ecosystems,and even health problems such as cancer.There are domestic and international regulations on carbon capture emission limits and few total amine emission limits.Although some progress has been made in the control of amine emissions,the problems of low removal efficiency,limited applicability,process complexity and high energy consumption of small particle aerosols need to be solved.
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