The densities and viscosities of aqueous blends of N-methyldiethanolamine (MDEA) and 2-amino-2-methyl-1-propanol with monoethanolamine (MEA) and diethanolamine (DEA) have been measured at (25, 30, 35, 40, 45, and 50) °C. The total amine strength in the solution was kept at 30 mass % in view of recent interest in using concentrated amine solutions in gas treating. Correlations for the density and viscosity of the ternary mixtures are presented.

In this work, the physical solubility of N 2 O in (monoethanolamine + water), (N-methyldiethanolamine + monoethanolamine + water), and (2-amino-2-methyl-1-propanol + monoethanolamine + water) and the diffusivity of N 2 O in (N-methyldiethanolamine + monoethanolamine + water) and (2-amino-2-methyl-1-propanol + monoethanolamine + water) have been measured at (293, 298, 303, 308, and 313) K. For the binary mixture, the amine concentration ranges studied are (2.0, 2.5, and 3.0) kmol‚m -3 . For the ternary mixtures, the total amine strength in the solution was kept at 30 mass %, in view of the recent interest in using concentrated amine solutions in gas treatment. A solubility apparatus was used to measure the solubility of N 2 O in amine solutions. The diffusivity was measured with a wetted wall column absorber. The accuracy of the measurement is estimated to be (2%. A semiempirical model of the excess Henry's constant was used to correlate the solubility of N 2 O in amine solutions. The parameters of the correlation were determined from the measured solubility data. The experimental N 2 O solubility and diffusivity data have been correlated. Comparison with the experimental results indicates that the models for solubility and diffusivity will be useful in estimating the solubility of N 2 O in (MEA + H 2 O), (MDEA + MEA + H 2 O), and (AMP + MEA + H 2 O) as well as the diffusivity of N 2 O in (MDEA + MEA + H 2 O) and (AMP + MEA + H 2 O) solvents. The "N 2 O analogy" is then used to estimate the solubility and diffusivity of CO 2 in the aqueous alkanolamine solutions.

The solubility of CO 2 in aqueous solutions, 18 mass %, 25 mass %, and 30 mass % (2.0 M, 2.8 M, and 3.4 M), of 2-amino-2-methyl-1-propanol (AMP) has been measured over a temperature range of (303 to 323) K and a partial pressure range of (1 to 100) kPa. In this work, the modified Clegg-Pitzer equation is used to correlate and predict the vapor-liquid equilibria of the (CO 2 + AMP + H 2 O) system. The model predicted results are in good agreement with the experimental vapor-liquid equilibrium (VLE) measurements in this work. A nontraditional optimization algorithm, simulated annealing (SA), has been used for the parameter estimation. It is observed that adopting the SA technique for the estimation of interaction parameters results in better VLE prediction accuracy than using the traditional deterministic techniques, such as Levenberg-Marquardt.

In this work the physical solubility of N 2 O in (diethanolamine + water), (2-amino-2-methyl-1-propanol + water), (N-methyldiethanolamine + water), (N-methyldiethanolamine + diethanolamine + water), and (2-amino-2-methyl-1-propanol + diethanolamine + water) as well as the diffusivity of N 2 O in (Nmethyldiethanolamine + diethanolamine + water) and (2-amino-2-methyl-1-propanol + diethanolamine + water) have been measured at (293, 298, 303, 308, and 313) K. For the binary mixtures the amine concentration ranges studied are (2.0, 2.5, and 3.0) kmol‚m -3 . For the ternary mixtures the total amine strength in the solution was kept at 30 mass %, in view of the recent interest in using concentrated amine solutions in gas treating. A solubility apparatus was used to measure the solubility of N 2 O in amine solutions. The diffusivity was measured with a wetted wall column absorber. The uncertainty of the measurement is estimated to be (2%. A semiempirical model of the excess Henry's constant proposed by Wang et al. (Chem. Eng. J. 1992, 48, 31-40) was used to correlate the solubility of N 2 O in amine solutions. The parameters of the correlation were determined from the measured solubility data. The experimental N 2 O solubility and diffusivity data have been correlated. Comparison with the experimental results indicates that the models for solubility and diffusivity will be useful in estimating the solubility of N 2 O in (DEA + H 2 O), (AMP + H 2 O), (MDEA + H 2 O), (MDEA + DEA + H 2 O), and (AMP + DEA + H 2 O) as well as diffusivity of N 2 O in (MDEA + DEA + H 2 O) and (AMP + DEA + H 2 O) solvents. The "N 2 O analogy" is then used to estimate the solubility and diffusivity of CO 2 in the aqueous alkanolamine solutions.

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