Heat capacity of alkanolamines by differential scanning calorimetry

Measurements of the heat capacities of the alkanolamines monoethanolamine, diethanolamine, diglycolamine, di-2-propanolamine, triethanolamine, N-methyldiethanolamine, 2-amino-2-methyl-1-propanol, and 2-piperidineethanol were performed from 30 to 80 degrees C with a differential scanning calorimeter (DSC). The heat capacity of liquid water has been measured to verify the validity of the C-p measurements. The measured C-p of each alkanolamine has been expressed as a function of temperature. The estimated uncertainty of the measured heat capacities including the effect of impurities in a substance with a purity of 95% is +/- 3%. The measured heat capacities are, in general, of sufficient accuracy for most engineering-design calculations.