Abstract
The significant energy consumption associated with the carbon capture process has long posed a substantial obstacle to the extensive industrial utilization of amine solutions. Therefore, it is imperative to investigate a low-energy-consumption carbon capture solvent. This study meticulously examined thermomorphic absorbents composed of N-methylcyclohexylamine(MCA) and N,N-Dimethylcyclohexylamine(DMCA), delving into its absorption and desorption performances. Initially, focusing on absorption efficiency, we tested six varying concentration ratios of absorbents for CO2 absorption, scrutinizing their absorption rate and capacity. The analysis revealed that the rapid saturation of the absorbent stemmed from its limited absorption capacity. Notably, the MCA:DMCA=1 M:1 M ratio exhibited outstanding absorption capability, at 0.7015 mol CO2/mol amine, surpassing the absorption capacity of 30 wt% Monoethanolamine by a factor of 1.525. Subsequent desorption trials on MCA:DMCA=1 M:1 M at temperatures of 333 K, 348 K, and 363 K indicated successful desorption at 333 K, achieving an efficiency of 82.77 %, which rose with increasing temperature. Lastly, the estimated energy consumption for the latent heat and evaporation heat of this absorbent was approximately 0.342GJ/t CO2, marking a ∼61.1 % decrease compared to liquid-liquid phase change absorbents. These findings underscore the industrial promise of thermomorphic absorbents as a viable option for carbon capture applications.
Published Version
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