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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