Carbon dioxide from a gas stream was captured in a liquid water solution through a polymeric membrane that provided the interfacial area between the two phases. Three different absorbents (monoethanolamine, piperazine, and potassium carbonate) were tested, and the effects of their concentrations on the CO 2 absorption rate were investigated. The solution containing piperazine showed the best CO2 uptake, whereas that containing potassium carbonate was the least effective. This observation can be fully explained when the effects of the physicochemical parameters governing the absorption process (CO2 solubility, diffusivity, and reactivity in the solution) are taken into proper account. Useful guidelines for the correct design of a CO2 capturing system by a liquid solution were obtained.
ASJC Scopus subject areas
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering