Physical Solubility and Diffusivity of N₂O and CO₂ into Aqueous Solutions of (2-Amino-2-methyl-1-propanol + Monoethanolamine) and (N-Methyldiethanolamine + Monoethanolamine)

Abstract

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.

Solubility of CO2 in Nonaqueous Absorption System of 2-(2-Aminoethylamine)ethanol + Benzyl Alcohol

“…6 Many researchers have used blended amines, a solution of two or more amines in a variety of compositions, to improve absorption or desorption ability. 7,8 However, regardless of what the compositions of solutions are, the high sensible heat, and the latent heat of water vaporization will inevitably consume excessive energy in the regeneration process. During the regeneration process, a large amount of sensible heat is first utilized to increase the solution temperature to the stripping temperature because of the specific heat capacity of the aqueous solution.…”

Solubility of carbon dioxide in aqueous solutions of 2-amino-2-hydroxymethyl-1,3-propanediol

“…As is widely accepted nowadays, nitrous oxide can be used as a non-reactive surrogate of CO 2 to estimate through N 2 O analogy the physical solubility of CO 2 in amine solutions [14][15][16][17][18][19][20][21][22][23]. This analogy is described by the following Henry's law constant relationship [14]:…”

The physical solubilities and diffusivities of N2O and CO2 in aqueous ammonia solutions on the additions of AMP, glycerol and ethylene glycol

“…The apparatus and experimental procedure used were the same as those described by Li and Lai [10]. A thin solution film was maintained on the outside wall of the column by adding 0.03-0.05 vol% of Tween 80 to each amine solution.…”

“…Since CO 2 reacts in ammonia solutions, its physical solubility and diffusivity cannot be measured directly [10]. Therefore, the solubility and diffusivity of CO 2 in aqueous solvents were estimated by using the "N 2 O analogy method" as a function of temperature (293, 303, 313 and 323 K).…”