Analysis of CO₂ solubility and absorption heat into 1-dimethylamino-2-propanol solution

In this work, the CO₂ equilibrium solubility in 1-dimethylamino-2-propanol (1DMA2P) solution was determined as a function of 1DMA2P concentration (over the range of 1–5 M), temperature (in the range of 298–333 K), and CO₂ partial pressure (in the range of 8–101 kPa), and the data used to fit the correlations for K₂ using Kent-Eisenberg, Austgen, Li-Sheng and Hu-Chakma models. A new K₂ correlation model was also developed to predict the CO₂ equilibrium solubility in 1DMA2P solution. It was found that all of the models could fit the CO₂ equilibrium solubility in 1DMA2P solution data with absolute average deviations (ADDs) for the models by Kent-Eisenberg, Austgen, Li-Sheng, Hu-Chakma and Liu et al. of 14, 15, 12, 6.3 and 10%, respectively. In addition, the heat of CO₂ absorption in 1DMA2P solution estimated using Gibbs-Helmholtz equation was found to be −31.67 kJ/mol. Information or guidelines about effective utilization of data of screened solvents is provided based on three absorption parameters, namely, CO₂ equilibrium solubility, second order reaction constant, and CO₂ absorption heat.