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

摘要

In this work, 2-amino- 1,3-propanediol (Serinol) aqueous solutions were characterized through density, viscosity, surface tension and CO2 solubility measurements in order to evaluate the potential use of this alkanolamine for CO2 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. CO2 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"' solution. CO2 loading capacities were compared to literature data for monoethanolamine (MEA) and those obtained for (2.712 + 1.161) mol·kg~(-10 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 CO2 removal using membrane contactors. Solubility measurements showed that Serinol carbamates formed by the reaction with CO2 can be more easily regenerated in comparison with those produced in contact with MEA The CO2 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.