CO2 ABSORPSİYON PERFORMANSINI İYİLEŞTİRMEK İÇİN İLERİ ÇÖZÜCÜ SİSTEMLERİNİN OPTİMİZASYONU VE ENERJİ VERİMLİ CO2 YAKALAMA İÇİN KATALİTİK ÇÖZÜCÜ REJENERASYONUNUN ARAŞTIRILMASI

Abstract

The substantial energy demand of CO2-loaded solvent regeneration constitutes a significant economic challenge for the industrial applications of CO2 capture and utilization technologies. The CO2 absorption-desorption performances of non-aqueous tri-blend amines, monoethanolamine (MEA), 2-amino-2-methyl-1-propanol (AMP), methyl diethanol amine (MDEA), 1-dimethyl amino-2-propanol (1DMA2P), diethyl ethanol amine (DEEA), and piperazine (PZ), were investigated in terms of desorption parameters. Two tri-blend amine combinations, primary amine (MEA)/sterically hindered amine (AMP)–tertiary amine (MDEA/1DMA2P/DEEA)-polyamine (PZ) were prepared at 5M total amine concentrations with different molarities. Response surface methodology (RSM) based on a central composite design (CCD) was used to obtain the optimal condition. This study’s first part aimed to determine the molarity ratios of solvent systems and investigate their effects on objective functions: heat duty, desorption rate, and desorption factor. Surface analysis suggested optimum conditions as 3 M MEA–1.375 M MDEA–0.625 M PZ for the lowest energy consumption. The experimental results of the proposed system were compared with the 5M MEA solution.

The nano-catalysts have the capability to improve CO2 desorption while reducing the energy demands for solvent regeneration. The second part of this study focuses on studying the absorption-desorption performance of the selected optimum non-aqueous tri-blend amine combinations (monoethanolamine (MEA), methyl diethanol amine (MDEA) and piperazine (PZ)) in the presence of nanocatalyst. The nanocatalysts used were examined in two different groups as metal oxide nanocatalysts and zeolite nanocatalysts, and different amounts of catalysts were used in the study. The catalysts used are HZSM-5, H-ferrierite (FER), H-mordenite (MOR), γ-aluminium-oxide (Al2O3), titanium-oxide (TiO2), magnesium-oxide (MgO), indium-oxide (In2O3). The incorporation of solid catalysts leads to a substantial enhancement in desorption performance of the solution and reduced the energy consumption in comparison to blank test. Higher desorption efficiency occurred with the presence of lower catalyst amounts. The sequence of CO2 desorption heat duty performance reduction with 0.125 g catalyst, was as follows: MgO (70.9%) > In2O3 (80.2%) > HZSM-5 (84.1%) > Al2O3 (84.2%) > FER (87.1%) > MOR (88.4%) > TiO2 (74%), relative to blank test (100%). HZSM-5 exhibited the highest desorption factor as 4.25*10-7 mol3/kJ.min, while increasing desorption rate to 2.37*10-3 mol/min. This study provides the desorption performance of non-aqueous nanofluids with energy-efficient catalysts, highlighting their potential as promising materials for carbon capture and storage applications with improved energy efficiency.