Gas solubility of CO2 in aqueous solutions of N-methyldiethanolamine and diethanolamine with 2-amino-2-methyl-1-propanol

Gas solubility of H2S in aqueous solutions of N-methyldiethanolamine and diethanolamine with 2-amino-2-methyl-1-propanol at 313, 343, and 393K in the range 2.5–1036kPa

“…Fig. 4 shows a comparison between the solubility results of H 2 S of this work and those reported previously for CO 2 [4] in an aqueous solution of 32.5 wt.% MDEA and 12.5 wt.% DEA with 4 wt.% AMP, at 313.15, 343.15, and 393.15 K. It is possible to observe that H 2 S presents larger solubility than CO 2 , e.g. in this solution, at 313.5 K and 500 kPa, the value of xH 2 S is 0.118, whereas the value of xCO 2 is 0.104.…”

“…Although we have almost continuously used the experimental device for different solubility studies, some of them reported fairly recently [4], we decided that in order to establish the accuracy of the experimental data presented in this work with the experimental arrangement and procedure described, to measure the solubility of hydrogen sulfide in an aqueous solution of 35 wt.% MDEA with 10 wt.% DEA, at 313.15 K. The new data from this work agree well with the literature data [10,11]. Fig.…”

“…The degassed aqueous solution was then fed into the previously evacuated equilibrium cell. The temperature of the equilibrium cell was controlled within ±0.02 K up to 343 K, and within ±0.5 K at 393 K. The equilibrium total pressure was measured with an accuracy of ±3.5 kPa [4][5][6]. The vapor pressure of the H 2 Sfree aqueous alkanolamine solutions was determined at each equilibrium temperature, hence the partial pressure of H 2 S was simply calculated as the difference between the equilibrium total pressure and the vapor pressure of the aqueous alkanolamine solution.…”

“…The apparatus used in the present study is based on the static method with circulation of the vapor phase and is the same used in previous works [4][5][6] with minor modifications. It consists of an equilibrium cell and two gas-storage cylinders, immersed in independent constant-temperature bath circulators.…”

“…We have studied in previous work the solubility of CO 2 in aqueous solutions of mixtures of three alkanolamines: a tertiary amine MDEA, a secondary amine DEA, and a sterically hindered amine 2-amino-2-methyl-1-propanol (AMP) under conditions that include the working temperature and pressure of an absorption tower and that of a stripping tower [4].…”