Solubility of CO₂ in and Density, Viscosity, and Surface Tension of Aqueous 2-Amino-1,3-propanediol (Serinol) Solutions

In this work, 2-amino-1,3-propanediol (Serinol) aqueous solutions were characterized through density, viscosity, surface tension and CO 2 solubility measurements in order to evaluate the potential use of this alkanolamine for CO 2 removal from different gas mixtures. Density and viscosity were measured from temperature T = (293.2 to 313.2) K and for amine concentrations from molality m = (0.953 to 4.693) mol·kg –1 . Surface tension data were measured for the same solution concentrations but at T = (298.2 and 313.2) K. CO 2 solubility in Serinol solutions from m = (0.953 to 4.704) mol·kg –1 was determined at T = 313.15 K and at T = (343.15 and 373.15) K for the m = 4.704 mol·kg –1 solution. CO 2 loading capacities were compared to literature data for monoethanolamine (MEA) and those obtained for (2.712 + 1.161) mol·kg –1 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD) + piperazine (Pz) solution at T = (313.15 and 373.15) K. It was found that Serinol solutions have higher surface tensions compared to conventional absorbents, making them very suitable for CO 2 removal using membrane contactors. Solubility measurements showed that Serinol carbamates formed by the reaction with CO 2 can be more easily regenerated in comparison with those produced in contact with MEA. The CO 2 cyclic capacity of Serinol was found to be 58% higher than that of MEA and close to the value obtained for the AHPD + Pz system.