The equilibrium solubility of H 2 S, CO 2, and their mixed gas in a solution of N -methyldiethanolamine (MDEA) mixed with ethylene glycol (EG) has been measured at temperatures from 25 to 90 °C, partial pressures of H 2 S from 0.34 to 38.8 kPa, and partial pressures of CO 2 from 1.92 to 95.4 kPa. The solubility of either CO 2 or H 2 S in mixed MDEA solutions was compared with that in 30 wt % MDEA aqueous solutions. The result shows that the CO 2 solubility in MDEA mixed with EG is much lower than its solubility in aqueous MDEA solutions because the reaction between MDEA and CO 2 would be limited by a very low water content. However, the H 2 S solubility is only somewhat lower than that in aqueous MDEA solutions only considering its lower solubility in EG than in water. This result indicated that the selectivity of H 2 S against CO 2 is improved. A simplified model was proposed to correlate the experimental data and the average deviation for solubility of H 2 S and CO 2 is 4.59% and 6.19%, respectively. The enthalpy changes of solving of CO 2 and H 2 S in solutions of MDEA mixed with EG depend on the loading of acid gases, and it is lower than that of solving in aqueous MDEA solutions. This phenomenon may be explained by the fact that the degree of solvation in an organic solvent is less than that in water.
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Xu et al. (2002) studied this question.
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