Investigation of CO₂ Regeneration in Single and Blended Amine Solvents with and without Catalyst

Abstract

Various single and blended amines (namely, MEA­(monoethanolamine), MEA-DEEA (2-diethylamino ethanol), MEA-MDEA (methyldiethanolamine), MEA-1DMA2P (1-dimethylamino-2-propanol)) with three types of catalysts (H-ZSM-5, MCM-41 and SO4 2–/ZrO2) were studied to determine the respective roles of catalyst and solvent in heat duty and CO2 desorption rate with an initial CO2 loading of 0.5 mol CO2/mol amine at 371 K. The results show that performance of the three catalysts in all the four investigated aqueous solution systems followed the trend: H-ZSM-5 > MCM-41 > SO4 2–/ZrO2. These results highlight the fact that even though HZSM-5 has moderate acidic sites as compared to MCM-41 and SO4 2–/ZrO2, its large B/L acid sites ratio coupled with mesopore surface area had the best performance. Furthermore, based on this study, the blended system of aqueous 5 M MEA+1 M MDEA with H-ZSM-5 provided the best approach for solution regeneration because the strong electron withdrawing chemical structure of MDEA.

CO2 desorption tests of blended monoethanolamine–diethanolamine solutions to discover novel energy efficient solvents

“…Others tried MEA + AMP solutions and it also reduced heat duty . Recently, some researchers developed CO 2 desorption analyses for MEA blended with other R 3 N, such as MEA‐DEEA and MEA‐1DMA2P with and without solid catalysts . The CO 2 desorption performance of the noncatalytic heating process indicated that the order of blended amines is 5 mol/L MEA + 1 mol/L MDEA >5 mol/L MEA + 1 mol/L 1DMA2P > 5 mol/L MEA + 1 mol/L DEEA >5 mol/L MEA .…”

On the role of solid particles in CO2 bubble nucleation for solvent regeneration of MEA‐based CO2 capture technology

“…The results for sensible heat, heat of evaporation, and heat of reaction are listed in Table . The heat duty and average desorption rate were also compared with previous reported results by Liu, and Srisang, where solid acid catalysts were added to reduce the energy consumption of the MEA regeneration process. The results showed that the addition of 5 g HZSM‐5 in the solution could save 30.2% of sensible heat, reduce vapor consumption by 18.7%, and total energy consumption by 23.3%.…”

“…Liu et al . compared the desorption performance of MEA rich solution at 98°C using the HZSM‐5 catalyst; the results show that the CO 2 desorption rate increased 29.4% and the heat duty reduced 24.8% . Srisang et al .…”

“…6 Liu et al compared the desorption performance of MEA rich solution at 98°C using the HZSM-5 catalyst; the results show that the CO 2 desorption rate increased 29.4% and the heat duty reduced 24.8%. 7 Srisang et al designed a full-cycle CO 2 absorption-desorption device using the HZSM-5 catalyst for MEA regeneration. 8 The results showed that the heat duty could be reduced by 42%.…”

Catalytic solvent regeneration of a CO2‐loaded MEA solution using an acidic catalyst from industrial rough metatitanic acid

“…It was reported that the solid acids, such as HZSM‐5, γ ‐Al 2 O 3 , and H‐Y were added to a CO 2 ‐loaded MEA absorbent to increase the regeneration rate at 95°C, with a CO 2 desorption rate improvement of 18.2% with HZSM‐5 and 24.0% with γ ‐Al 2 O 3 . Zhang et al . reported that the regeneration performance of the CO 2 ‐loaded MEA solvent was enhanced by adding solid acid catalysts, such as MCM‐41, SO 4 2− /ZrO 2 , and SAPO‐34.…”