Measuring CO2 and N2O Mass Transfer into GAP-1 CO2–Capture Solvents at Varied Water Loadings

Abstract

This paper investigates the CO2 and N2O absorption behavior in the water-lean gamma amino propyl (GAP)-1/TEG solvent system using a wetted-wall contactor. Testing was performed on a blend of GAP-1 aminosilicone in triethylene glycol at varied water loadings in the solvent. Measurements were made with CO2 and N2O at representative lean (0.04 mol CO2/mol alkalinity), middle (0.13 mol CO2/mol alkalinity), and rich (0.46 mol CO2/mol alkalinity) solvent loadings at 0, 5, 10, and 15 wt % water loadings at 40, 60, and 80 °C and N2O at (0.08–0.09 mol CO2/mol alkalinity) at 5 wt % water at 40, 60, and 80 °C. CO2 flux was found to be nonlinear with respect to log mean pressure driving force (LMPD). Liquid-film mass transfer coefficients (k′g) were calculated by subtracting the gas film resistance (determined from a correlation from literature) from the overall mass transfer measurement. The resulting k′g values for CO2 and N2O in GAP-1/TEG mixtures were found to be higher than that of 5 M aqueous monoethanolamine u...