Experimental study on the solvent regeneration of a CO₂‐loaded MEA solution using single and hybrid solid acid catalysts

Abstract

The performance of a hybrid solid acid catalyst consisting of a physical mixture of γ‐Al2O3 and H‐ZSM‐5 in terms of the rate and heat duty for solvent regeneration (i.e., CO2 stripping) of a CO2‐rich MEA solution was compared with the individual performance of γ‐Al2O3, H‐ZSM‐5, and H‐Y solid acid catalysts using MEA (2–7 mol/L), with initial CO2 loading of 0.5 mol CO2/mol MEA at 378 K. It was observed that any catalyst significantly decreased the energy required for CO2 regeneration. The performance of the catalysts investigated ranked as follows: γ‐Al2O3/H‐ZSM‐5 = 2/1 > γ‐Al2O3 > H‐ZSM‐5 > H‐Y if the process is in the lean CO2 loading region whereas it was H‐ZSM‐5 > γ‐Al2O3/H‐ZSM‐5 = 2/1 > γ‐Al2O3 > H‐Y if the process is in the rich CO2 loading region. These results highlight the joint dependence on Brønsted/Lewis acidity and mesopore surface area of heat duty for solvent regeneration. © 2015 American Institute of Chemical Engineers AIChE J, 62: 753–765, 2016

Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

“…1c, TiO 2 barley changes CO 2 desorption from the spent MEA sorbent. Unlike TiO 2 , the HZSM-5 can slightly improve CO 2 desorption as reported by Idem et al 13 . Silica gel also can slightly improve CO 2 desorption, however it cannot lower the temperature for maximum CO 2 desorption rate (Supplementary Table 1).…”

“…Qualitatively consistent with the Bhatti et al work 15 , TiO 2 also barely changes the CO 2 sorption breakthrough curve. Also, recently reported H-ZSM5 13,14 does not change CO 2 breakthrough curve much. However, TiO(OH) 2 significantly increases the effective sorption period in which capturing 90% CO 2 in flue gas is realized as targeted by U.S. Department of Energy (DOE) 16 .…”

“…Our group have showed that FeOOH and TiO(OH) 2 could be used as catalytic supports to reduce the activation energy of the NaHCO 3 decomposition reaction and then enhance the decomposition rate 11,12 . Idem et al reported that H-ZSM and γ-Al 2 O 3 could be used to accelerate the amine based solvent regeneration and thus reducing the heat duty for amine regeneration 13,14 . Bhatti et al 15 recently reported an inspiring finding that transition metal oxides could affect spent monoethanolamine (MEA) regeneration.…”

Amine regeneration tests on MEA, DEA, and MMEA with respect to cabamate stability analyses

“…The catalytic work has been conducted by the author since 2010 . Liang et al studied the catalytic regeneration of 2–7 mol/L MEA solutions, and analyzed the heat duty and CO 2 release under different conditions. For the special groups of enzymes (carbonic anhydrase) .…”

Amine Regeneration Tests on MEA, DEA and MMEA with Respect to Energy Efficiency Study

“…The relative heat duty was also the research focus, and the absolute energy cost require an electric energy meter to measure electric power of the heater [18]. Based on the Figure 2-5 generated, the relative heat duties of these systems were calculated and grouped on Figure 6.…”