Nonaqueous absorbents have shown great potential in lowering regeneration energy for energy-efficient CO 2 capture. The effect of reaction media with varying solvent characteristics (polarity, solubility parameter and dielectric constant) on kinetic behaviors deserves to be discovered. In this work, CO 2 absorption flux against CO 2 partial pressure was determined in a stirred cell reactor at temperatures of 283.2–303.2 K with 1.0–5.0 mol L −1 2-(butylamino)ethanol (BAE) in nonaqueous 2-butoxyethanol (2-BE). Physicochemical properties and the physical mass transfer coefficients were also measured and represented by proposed correlations. The overall reaction rate constants were derived under the well-defined pseudo-first-order regime conditions. The partial reaction order with respect to BAE was found to be about 2.0 in 2-BE and 1.0–1.3 in water respectively, which reveals that the formation of ionic products may be highly depressed in solvent with low Hansen solubility parameter (HSP) resulting in the increasing reaction order. The overall third-order kinetic data can be well represented by termolecular mechanism model with AARD of 10.5 %. The findings will provide fundamental support for further pilot-scale performance demonstration.
Potassium prolinate + water + ethanol (ProK/W/Eth) solution has potential use as a liquid-to-solid phase-changing absorbent for energy-efficient CO2 capture process. In this study, the equilibrium solubility of CO2 in ProK/W/Eth solutions was measured in a stirred equilibrium cell at a temperature range from 293 to 343 K and CO2 partial pressures up to 200 kPa. Density and viscosity were also measured at temperatures from 293 to 333 K and ProK molality up to 6.09 mol·kg–1 ethanol. Moreover, the CO2 loading and cyclic capacity were compared with aqueous monoethanolamine (MEA) and aqueous ProK solution. The solubility data were well-represented using a Soft model with AAD within 8.0%. The data of density and viscosity were also correlated with empirical models. The predicted results matched well the experimental data with AAD within 0.37% for density and 1.38% for viscosity.
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