Solubility of N₂O and CO₂ in Dimethyl Sulfoxide, 2-(Butylamino)ethanol, and Their Water-Lean Blends

Abstract

The water-lean absorbent of dimethyl sulfoxide (DMSO)/2-(butylamino)ethanol (BAE)/H 2 O has recently been proposed for energy-efficient CO 2 capture. The CO 2 /N 2 O analogy method can provide important fundamental data for its kinetic study. In this work, the physical solubility of N 2 O and CO 2 in DMSO was measured in a static equilibrium cell at temperatures of (293.15−333.15) K. Solubility of N 2 O in BAE and the BAE/DMSO binary blends with 22.6, 34.9, and 61.8 mass % BAE was also determined. The effect of the water content on N 2 O solubility in the water-lean ternary blends with 61.8 mass % BAE was also discussed. The ratios of solubility of CO 2 to N 2 O in polar solvents (i.e., DMSO and water) were found to be very close at temperatures of 323−333 K. Experimental solubility data and the ones calculated from the recommended correlation models match well with each other, with average absolute relative deviations within 0.9%.

Measurement and Modeling of Thermophysical Properties of the Ternary System 2-(Butylamino)ethanol + Dimethyl Sulfoxide + Water and Its Binary Subsystems

“…The measured data and the literature data follow the same trend lines and overlap well with each other. For the BAE + DMSO binary blends, only three sets of density data at 22.6, 34.9, and 61.8 mass % BAE were reported in our recent work . Graphical comparison can be found in Figure S4.…”