Abstract

Anthropogenic CO2 emissions have enforced policymakers on the proper CO2 capture technologies planning. One of the well-established technologies for CO2 capture is the amine-based post-combustion CO2 capture. During the CO2 capture process, amines have been found to undergo nitrosation, producing nitramines and nitrosamines, which are potentially carcinogenic, mutagenic and toxic. Investigations on the formation of nitrosamines, nitramines and their destruction are at the state of the art for amine-based post-combustion CO2 capture technology. However, significant literature is available on this issue based on water treatment practices. Nitrosamines are more potent carcinogenic than nitramines. Whereas, nitramines are more stable than nitrosamines. Formation of nitrosamines through post-combustion CO2 capture within the process operating premises is mainly a function of NOx content in flue gas. Moreover, other contaminants like SOx and chlorine (Cl) also affect nitrosamines formation. Atmospheric formation of nitrosamines and nitramines is due to loss of amine to the environment through aerosols, amines mist, and amine vapors. All the available technologies for the elimination of nitramines and nitrosamines have certain limitations. However, photolysis and UV treatment through advanced oxidation processes are more effective. This study provides an alarmist situation of nitrosamines and nitrosamines formation from amine-based post-combustion CO2 capture technology based on the literature available for water treatment as well as CO2 capture. The manuscript discusses the concerns, formation and elimination of nitramines and nitrosamines.

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