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Bhatti, Umair H.,Sivanesan, Dharmalingam,Lim, Dae Ho,Nam, Sung Chan,Park, Sungyoul,Baek, Il Hyun Elsevier 2018 Journal of the Taiwan Institute of Chemical Engine Vol.93 No.-
<P><B>Abstract</B></P> <P>Despite the in-depth understanding of the amine-based post-combustion CO<SUB>2</SUB> capture technique gained by research efforts made over the decades, its large-scale practicality is hindered by extensive energy input in desorption and solvent degradation issues. The most thoroughly studied alkanolamine solvent, monoethanolamine (MEA), is still unable to capture a significant portion of CO<SUB>2</SUB> emissions at a bearable economic penalty, owing to these serious drawbacks. Herein, we demonstrate catalytic regeneration of MEA solvent with five commercially available metal oxide catalysts ̶ Ag<SUB>2</SUB>O, Nb<SUB>2</SUB>O<SUB>5</SUB>, NiO, CuO, and MnO<SUB>2</SUB> which would render this process suitable for achieving a bearable penalty. CO<SUB>2</SUB>-rich MEA solvent with an initial loading of 0.50 mol CO<SUB>2</SUB>/mol MEA was used in this study. A temperature range of interest was selected to perform the experiments in order to identify the optimal operating temperature for each of the catalysts used in this study. The results show that all of the catalysts used in this study improve the MEA regeneration where Ag<SUB>2</SUB>O presents the best regeneration performance followed by Nb<SUB>2</SUB>O<SUB>5</SUB> by desorbing up to 3.6 and 2.5 times greater CO<SUB>2</SUB> amounts with faster desorption rates, respectively. Overall, the results show that the MEA solvent can be regenerated at temperature as low as 80 °C, and hence a significant reduction in heat requirement for solvent regeneration is possible. Besides, at this temperature, thermal degradation of the solvent can be avoided completely. Furthermore, as a considerable improvement in the CO<SUB>2</SUB> desorption rate and cyclic capacity is achieved by the catalytic regeneration process, the size of the stripper and the solvent circulation rate can be reduced, which will decrease the capital and operating cost as well.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A promising metal oxide catalyst-aided MEA solvent regeneration technique is presented. </LI> <LI> With catalyst, MEA solvent can be regenerated at temperatures as low as 80 °C. </LI> <LI> Performance of the catalyst depends on acid sites and metal geometry. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Catalyst-aided Regeneration of Amine Solvents for Efficient CO<sub>2</sub> Capture Process
Bhatti, Umair H.,Sultan, Haider,Cho, Jin Soo,Nam, Sungchan,Park, Sung Youl,Baek, Il Hyun The Korean Society for Energy 2019 에너지공학 Vol.28 No.4
Thermal amine scrubbing is the most advanced CO<sub>2</sub> capture technique but its largescale application is hindered due to the large heat requirement during solvent regeneration step. The addition of a solid metal oxide catalysts can optimize the CO<sub>2</sub> desorption rate and thus minimize the energy consumption. Herein, we evaluate the solvent regeneration performance of Monoethanolamine (MEA) and Diethanolamine (DEA) solvents without and with two metal oxide catalysts (TiO<sub>2</sub> and V<sub>2</sub>O<sub>5</sub>) within a temperature range of 40-86℃. The solvent regeneration performance was evaluated in terms of CO<sub>2</sub> desorption rate and overall amount of CO<sub>2</sub> desorbed during the experiments. Both catalysts improved the solvent regeneration performance by desorbing greater amounts of CO<sub>2</sub> with higher CO<sub>2</sub> desorption rates at low temperature. Improvements of 86% and 50% in the CO<sub>2</sub> desorption rate were made by the catalysts for MEA and DEA solvents, respectively. The total amount of the desorbed CO<sub>2</sub> also improved by 17% and 13% from MEA and DEA solvents, respectively. The metal oxide catalyst-aided regeneration of amine solutions can be a new approach to minimize the heat requirement during solvent regeneration and thus can remove a primary shortfall of this technology.
Catalyst-aided Regeneration of Amine Solvents for Efficient CO2 Capture Process
백일현,Umair H. Bhatti,Haider Sultan,조진수,남성찬,박성열 한국에너지학회 2019 에너지공학 Vol.28 No.4
Thermal amine scrubbing is the most advanced CO2 capture technique but its largescale application is hindered due to the large heat requirement during solvent regeneration step. The addition of a solid metal oxide catalysts can optimize the CO2 desorption rate and thus minimize the energy consumption. Herein, we evaluate the solvent regeneration performance of Monoethanolamine (MEA) and Diethanolamine (DEA) solvents without and with two metal oxide catalysts (TiO2 and V2O5) within a temperature range of 40–86 oC. The solvent regeneration performance was evaluated in terms of CO2 desorption rate and overall amount of CO2 desorbed during the experiments. Both catalysts improved the solvent regeneration performance by desorbing greater amounts of CO2 with higher CO2 desorption rates at low temperature. Improvements of 86% and 50% in the CO2 desorption rate were made by the catalysts for MEA and DEA solvents, respectively. The total amount of the desorbed CO2 also improved by 17% and 13% from MEA and DEA solvents, respectively. The metal oxide catalyst-aided regeneration of amine solutions can be a new approach to minimize the heat requirement during solvent regeneration and thus can remove a primary shortfall of this technology.
Sultan, Haider,Bhatti, Umair H.,Cho, Jin Soo,Park, Sung Youl,Baek, Il Hyun,Nam, Sungchan The Korean Society for Energy 2019 에너지공학 Vol.28 No.4
The high energy penalty in amine-based post-combustion CO<sub>2</sub> capture process is hampering its industrial scale application. An advanced process is designed by intensive heat integration within the conventional process to reduce the stripper duty. The study presents the technical feasibility for stripper duty reduction by intensive heat integration in CO<sub>2</sub> capture process. A rigorous rate-based model has been used in Aspen Plus® to simulate conventional and advanced process for a 300 MW coal-based power plant. Several design and operational parameters like split ratio, stripper inter-heater location and flowrate were studied to find the optimum values. The results show that advanced configuration with heat integration can reduces the stripper heat by 14%.
Minimization of Energy Consumption for Amine Based CO2 Capture Process by Process Modification
백일현,Haider Sultan,Umair H. Bhatti,조진수,남성찬,박성열 한국에너지학회 2019 에너지공학 Vol.28 No.4
The high energy penalty in amine-based post-combustion CO2 capture process is hampering its industrial scale application. An advanced process is designed by intensive heat integration within the conventional process to reduce the stripper duty. The study presents the technical feasibility for stripper duty reduction by intensive heat integration in CO2 capture process. A rigorous rate-based model has been used in Aspen Plus® to simulate conventional and advanced process for a 300 MW coal-based power plant. Several design and operational parameters like split ratio, stripper inter-heater location and flowrate were studied to find the optimum values. The results show that advanced configuration with heat integration can reduces the stripper heat by 14%.