Solubilities of mixtures of carbon dioxide and hydrogen sulfide in water plus diethanolamine plus 2-amino-2-methyl-1-propanol

The solubilities of mixtures of carbon dioxide and hydrogen sulfide in water + diethanolamine (DEA) + 2-amino-2-methyl-1-propanol (AMP) have been measured at 40 degrees C and 80 degrees C and at partial pressures of acid gases ranging from 1.0 to 200 kPa. The ternary mixtures studied were 30 mass % AMP, 6 mass % DEA + 24 mass % AMP, 12 mass % DEA + 18 mass % AMP, 18 mass % DEA + 12 mass % AMP, 24 mass % DEA + 6 mass % AMP, and 30 mass % DEA aqueous solutions. The model of Deshmukh and Mather (1981) has been used to represent the solubility of mixtures of CO2 and H2S in the ternary solutions. The model reasonably reproduces the equilibrium partial pressures of CO2 and H2S above the ternary solutions for the systems tested.