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

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.