This study investigated CO2 capture from flue gas by
using glycerol as solvent. Absorption was simulated using a rate-based
model with three cases under similar operating conditions. CO2 separation was first simulated using ENRTL-RK thermodynamic
model with monoethanolamine (MEA) as solvent. CO2 absorption
was then simulated using NRTL-RK thermodynamic model with glycerol
solvent, and then an aqueous mixture of MEA/glycerol was also simulated
using ENRTL-RK thermodynamic model. Simulation results confirm that
glycerol can be used as promoter with MEA solvent to enhance CO2 capture. The optimal glycerol concentration for CO2 absorption is 10–40 wt %, in which 10 wt % glycerol exhibits
the lowest CO2 concentration in the outlet gas from the
absorber. The CO2 removal efficiency increases from 62.24%
for 10 wt % MEA aqueous solution to 64.33% for the mixture of 10 wt
% MEA–10 wt % glycerol aqueous solution. The CO2 removal efficiency for 10 wt % glycerol aqueous solution is 27.31%.
It is essential to understand the adsorption of guest molecules on carbon-based materials for both theoretical and practical reasons. It is crucial to analyze the surface properties of carbon-based materials with a wide range of applications (e.g., catalyst supports, hydrogen storage, sensors, adsorbents, separation media, etc.). Inverse gas chromatography (IGC) as a powerful and sensitive technique can be used to characterize the surface physicochemical properties (i.e., Brunauer-Emmett-Teller (BET) surface area, surface energy heterogeneity, heat of adsorption, specific interaction of adsorption, work of cohesion, glass transition temperatures, solubility, and so forth) of various types of materials such as powders, films, and fibers. In this review, the principles, common methods, and application of IGC are discussed. In addition, the examples of various experiments developed for the IGC to characterize the carbonaceous materials (such as carbon nanotubes, graphite, and activated carbon) are discussed.
CO 2 removal from mixed CO 2 -N 2 gas was investigated by using aqueous solutions of monoethanolamine (MEA) (10 wt%), glycerol (10 wt%), and a mixture of MEA (10 wt%)glycerol (10 wt%) in a pilot-scale packed column. Aspen Plus simulator was employed to simulate the CO 2 -MEA-glycerol process using a rate-based model. Then, the experimental data of pilot-scale columns were applied to validate the simulation results. The lowest and highest rich CO 2 loadings for the MEA solvent were measured in 3.65% and 13.9% mol CO 2 /mol MEA with 1.4 and 3.9 L/min gas flow rates, respectively. In comparison to CO 2 -MEA system, the lowest and highest rich CO 2 loadings for CO 2 -MEA-glycerol system increased by 42.2% and 14.8%, respectively under the same conditions. The values of CO 2 loadings predicted by the simulation were in concordance with the experimental values. Results suggested that the hybrid MEA-glycerol solution had better CO 2 absorption performance than the aqueous MEA solution.
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