Solubility of carbon dioxide and nitrous oxide in 50 mass % methyldiethanolamine

The partial pressure of carbon dioxide above a 50 mass % aqueous solution o f methyldiethanolamine was measured as a function of the amount of carbon d ioxide absorbed in the solution. Data were obtained over the temperature ra nge 25 degreesC to 100 degreesC and for carbon dioxide loadings up to 0.5 m ol CO2/mol amine. Data were also obtained for the solubility of nitrous oxi de in these solutions over the temperature range 25 degreesC to 80 degreesC . It is found that the solubility of nitrous oxide decreases significantly as the carbon dioxide loading increases. The data obtained in this study ma y be used with the nitrous oxide analogy method to estimate the physical so lubility of carbon dioxide in 50 mass % methyldiethanolamine solutions as a function of carbon dioxide loading and temperature.