In this study, CO2 absorption capacity in aqueous mixtures of 2-amino-2-methyl-1-propanol, (AMP) and N-butyl-3-methylpyridinium tetrafluoroborate, [B3MPYR][BF4] was measured at pressures from 200 kPa up to 5000 kPa and temperatures of 303.15 K - 333.15 K. The AMP concentration was maintained at 1 M while the [B3MPYR][BF4] concentration ranges from 0.05 M to 0.3 M. It was observed that CO2 loading capacity increases when the pressure increased. However, increasing of temperature will decrease the CO2 loading. From the experimental results, a simple correlation, as suggested by Jou and Mather was used to predict the CO2 loading in the aqueous AMP-[B3MPYR][BF4] mixtures. The model were found to be in a good agreement with the experimental results where only 1.66% of the predicted values deviate more than 20% compared to the experimental values.