Heat Capacity of Aqueous Mixtures of Monoethanolamine with 2-Amino-2-methyl-l-propanol

Heat capacities of aqueous mixtures of monoethanolamine with 2-amino-2-methyl-l-propanol were measured from 30 °C to 80 °C with a differential scanning calorimeter (DSC). The heat capacities of 2-amino-2-methyl-l-propanol, 2-amino-2-methyl-l-propanol + water, and monoethanolamine + 2-amino-2-methyl-l-propanol were also studied. Eight binary systems and sixteen ternary systems were studied. The estimated uncertainty of the measured heat capacities is ±2%. An excess molar heat capacity expression using the Redlich−Kister equation for the composition dependence is used to represent the measured C p of aqueous alkanolamine solutions. The results (AAD %, the average absolute percentage deviation) for the calculation of the excess molar heat capacities are 3.6% and 13.2% for the binary and ternary systems, respectively. The heat capacities of aqueous mixtures of monoethanolamine with 2-amino-2-methyl-l-propanol presented in this study are, in general, of sufficient accuracy for most engineering-design calculations.