To replace the thermal
regeneration method of absorbent in the
CO2 capture system, a novel method of CO2 absorption–mineralization
was investigated. In this study, various alkanolamine absorbents,
such as monoethanolamine (MEA), diethanolamine (DEA), N-methyldiethanolamine (MDEA), and 2-amino-2-methyl-1-propanol (AMP),
were applied to the CO2 absorption–regeneration
process with different regeneration methods via thermal treatment
and mineralization. Calcium chloride was added as a calcium source
in the mineralization process. Integration of absorption and mineralization
defined as a single process was proposed in this study to resolve
the excessive requirement of energy in a conventional amine regeneration
process, leading to enhanced working capacity and desorption rate
without increasing the regeneration temperature. This method provides
an increment of working capacity 1.3–3 times higher than the
conventional thermal amine-scrubbing process. Among the tested amines,
MEA exhibited the highest increase of working capacity and AMP showed
the highest yield of CaCO3. MEA, DEA, and MDEA favored
the formation of calcite, while AMP produced a mixture of calcite
and vaterite.
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