Heat capacities of aqueous solutions containing diethanolamine and N-methyldiethanolamine |
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Authors: | Tzn-Wei Shih Allan N. Soriano Meng-Hui Li |
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Affiliation: | R&D Center for Membrane Technology, Department of Chemical Engineering, Chung Yuan Christian University, Chung Li, Taiwan |
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Abstract: | In this work, we present new results for heat capacities of aqueous mixtures of diethanolamine with N-methyldiethanolamine over the temperature range (303.2 to 353.2) K with a differential scanning calorimeter. For mole fractions of water ranging from 0.2 to 0.8, 16 concentrations of the (DEA + MDEA + water) systems were investigated. For the binary system, (DEA + MDEA), heat capacities of nine concentrations were also measured. A Redlich–Kister-type equation for representing excess molar heat capacity was applied to correlate the measured Cp of aqueous alkanolamine solutions. For a total of 176 data points for the (DEA + MDEA + water) system, the overall average absolute percentage deviation of the calculations are 16.5% and 0.2% for the excess molar heat capacity and the molar heat capacity, respectively. The heat capacities presented in this study are, in general, of sufficient accuracy for most engineering-design calculations. |
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