Phase equilibrium behavior of carbon dioxide in aqueous 2-amino-2-methyl-1-propanol and N-butyl-3-methylpyridinium tetrafluoroborate

The vapor-liquid phase behavior of CO2 in the mixture of 2-amino-2-methyl-1-propanol (AMP) and N-butyl-3-methylpyridinium tetrafluoroborate ([B3MPYR][BF4]) at equilibrium have been investigated. The phase equilibrium behavior of the CO2 was determined by measuring the CO2 loading at temperatures of 303.15 K and 313.15 K and pressures up to 5000 kPa using a high pressure jacketed reactor. The experimental results show that the solubility of CO2 increases as the pressure increase. However increasing temperature decrease the CO2 solubility. Moreover it was observed that the solubility decrease due to the addition of [B3MPYR][BF4] to the aqueous AMP.