In Figure 7, the amount of carbon dioxide absorption is observed in
terms of changes in the concentration of piperazine. This is due to the
accelerated reaction of amine solution with carbon dioxide in the
presence of piperazine, because of its specific properties, piperazine
can improve the absorption of carbon dioxide. However, at higher
concentrations, the incremental gradient of absorption of carbon dioxide
in the adsorbent solution decreases, which is due to the fact that with
excessive increase in the piperazine, the viscosity of the adsorbent
solution increases and the absorption gradient is lower. This indicates
that the added amount of piperazine should be optimal and according to
the system requirements.
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