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.