Abstract
Support-free cross-linked polyethyleneimine sorbent (CPEI) for CO2 capture was evaluated as the regenerable sorbent. The total amines available for the CO2 capture on CPEI were determined by the polyethyleneimine/glutaraldehyde ratio for the synthesis of CPEI. The CO2 capacity of CPEI in the slurry bubble column reactor reached 4.92 mmol/g, which is 1.97 times higher than that obtained under anhydrous conditions. The adsorption kinetics of CPEI in the reactor were investigated in terms of the CPEI amount, the CO2 fraction, the gas flow rate, temperature, and the total amines available. The experimental breakthrough curves for the sorbent were well-fitted with a fractional-order kinetic model. The modeling analysis found the influence of diffusion resistance on the adsorption is more significant than that of the driving force. The CO2 capacity of CPEI remained almost constant during the temperature swing adsorption/desorption cycles.
Highlights
Anthropogenic activity is the main cause of the increased atmospheric concentrations of CO2 [1]
The results show that the CO2 capacity of cross-linked polyethyleneimine sorbent (CPEI) slurry decreased by about 1:5 ± 0:5% after ten cycles of operations
The CPEI-3 sorbent prepared at the PEI/GA ratio of 7 : 1 demonstrated the highest CO2 adsorption capacity
Summary
Anthropogenic activity is the main cause of the increased atmospheric concentrations of CO2 [1]. The long-term exposure to the CO2 level higher than 0.5% can cause severe health problems, such as fatigue, listlessness, malaise, mood changes, and headache [2,3,4]. The removal of CO2 from cabin atmosphere is a critical function of the life support system of submarine and space capsule [5]. The removal of CO2 from the ambient environment can be achieved by applying a variety of physical and chemical processes such as aqueous solutions of alkanolamine absorption [6], membrane separation [7], and biological capture [8]. Chemical absorption/adsorption is regarded as one of the most promising CO2 capture technologies. It has been widely used due to its high efficiency, low energy consumption, environmental friendliness, etc. [9, 10]
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