The anthropogenic carbon dioxide (CO 2 ) denseness in the earth's atmosphere is increasing day-to-day by combusting fossil fuels for power generation. And, it is the most important greenhouse gas (GHG) responsible for 64% of global warming. Solvent-based carbon capture gained more attention towards researchers because of its easiness to integrate with the coal-fired power plant without significant modifications. During CO 2 absorption, the physical property of the solvent gets changed. A change in the solvent's physicochemical property affects further CO 2 absorption, thereby increasing the carbon-capture energy demand. The present experimental study encompasses CO 2 absorption studies using 30 wt% aqueous monoethanolamine (MEA), 2-amino-2methyl-1-propanol (AMP) and piperazine (PZ) followed by the detailed analysis of physicochemical properties (pH, carbon loading (α), viscosity (μ), density (ρ) and surface tension (σ)) of various CO 2 -loaded solutions. The results revealed that these properties are exhibiting interdependent eccentrics. Furthermore, an empirical model was developed to predict the carbon loading of the tested solvents. This model includes the tested physicochemical properties, reaction mixture temperature, diffusivity and change in the mass of solvent during carbon loading. In addition, an empirical model for viscosity as a function of temperature, carbon loading and molecular weight of solvents was developed. These models appear to predict the carbon loading and the viscosity well with greater accuracy.Keywords CO 2 capture . Carbon loading . Diffusivity . Viscosity . Surface tension . Empirical modelling Highlights • Detailed analysis on physicochemical characteristics of different carbon-loaded 30 wt% aqueous MEA/AMP/PZ solutions.• Non-dimensional model to predict the carbon loading of the 30 wt% aqueous MEA/AMP/PZ solution was developed.• In addition, a predictive model for viscosity as a function of solvent molecular weight, temperature and carbon loading of the 30 wt% aqueous MEA/AMP/PZ solution was formulated with greater accuracy.
Carbon dioxide (CO2) is the most significant greenhouse gas, contributing 44% of global warming using coal combustion for electricity generation. The major goal is to reduce carbon dioxide emissions by using the carbon dioxide capture and storage (CCS) technique. Among various techniques, amine-based post-combustion carbon dioxide capture plays a critical role in CCS technology. Monoethanolamine (MEA) acts as a benchmarking solvent in the CCS process owing to its high absorption capacity, lower cost and high rate of reaction. The present investigation used 30 wt% MEA and animised flue gas (15 vol% carbon dioxide and resting nitrogen (N2) gas) at 0.5 pound/square inch (3.45 kPa) inlet pressure for carbon dioxide absorption followed by 1 h solvent regeneration (direct and indirect heating). Furthermore, measurements of physico-chemical properties such as pH, carbon dioxide loading, density, viscosity, alkalinity and surface tension and Fourier transform infrared (FTIR) spectroscopic analysis of unloaded, carbon dioxide-loaded and regenerated samples were carried out. During carbon dioxide absorption, a rich loading of 7.775 mol/kg was obtained, whereas after regeneration, lean loadings of 3.099 and 3.937 mol/kg were achieved. FTIR analysis of the regenerated sample reconfirmed carbamate and bicarbonate presence, indicating that the sample required further regeneration. An increase in density, viscosity and surface tension was observed during carbon dioxide loading due to stronger intermolecular forces between the solvent and carbon dioxide molecules, and a decrease was observed during solvent regeneration due to carbon dioxide stripping.
In the present work, an experiment for CO2 capture process were performed by absorption using various aqueous solvent blends of amine and ionic liquids. The solvent blends were prepared for various compositions by mixing TetraButylAmmonium Acetate [TBA][OAC] and TetraButylAmmonium Bromide [TBA][Br] ionic liquids with Monoethanolamine (MEA). The obtained results were compared with baseline MEA. It was observed that capture efficiency of CO2, absorption rate of CO2 and CO2 diffusion coefficient of MEA-[TBA][OAC] and MEA-[TBA][Br] solvent blends were comparatively higher than baseline 30%MEA. Moreover, the parameters such as density, viscosity, pH, carbon loading and surface tension of all the solvent blends were measured for before and after absorption process. The carbon loading of solvent blends MEA-[TBA][Br] (0.405 mole of CO2/mole of solvent) and MEA-[TBA][OAC](0.459 mole of CO2/mole of solvent) was slightly lower than baseline MEA (0.494 mole of CO2/mole of solvent). However, the viscosity of MEA-[TBA][Br] blends were remarkably lower than MEA-[TBA][OAC] blend and baseline MEA. This might be an important key factor in solvent recovery process with lesser energy demand for sustainable energy and environment.
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