Experimental study on CO2 absorption in aqueous mixtures of 2-amino-2-methyl-1-propanol and N-butyl-3-methylpyridinium Tetrafluoroborate

摘要

The issue of global warming associated with CO2 emissions has attracted many researchers to develop new solvent to reduce CO2 emissions. Blended amine mixtures have been identified as one of the promising chemical solvent to perform the task due to their capacity to capture high volume of CO2 without major modification of the existing equipment. In order to access the potential of the blended amine mixture to capture CO2, it is necessary to determine the solubility of CO2 in the mixtures. Therefore, in this work, the potential of blended mixture of 2-amino-2-methyl-1-propanol (AMP) and N-butyl-3-methylpyridinium Tetrafluoroborate [B3MPYR][BF4] as a solvent for capturing carbon dioxide (CO2) was studied using high pressure jacketed reactor. The CO2 solubility in aqueous mixtures of AMP-[B3MPYR][BF4] were performed at temperatures of 303.15 K to 323.15 K and pressures from 200 kPa up to 5000 kPa. The concentrations of [B3MPYR][BF4] were varied from 0.05 to 0.3 M. Similar to other amine mixtures behavior, the experimental results demonstrated that the CO2 solubility in the AMP-[B3MPYR][BF4] mixtures increases as the pressure increased and increasing the temperature will reduce the CO2 loading. It appears that increasing the concentration of [B3MPYR][BF4] will decrease the CO2 loading. This indicates that adding more [B3MPYR][BF4] to AMP is not favorable for CO2 capture and compared to single AMP, the blended AMP-[B3MPYR][BF4] mixtures have less CO2 absorption capacity.