Experimental investigation on CO2 absorption and physicochemical characteristics of different carbon-loaded aqueous solvents

Abstract

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.

Amine-Ionic Liquid Blends in CO2 Capture Process for Sustainable Energy and Environment

“…A similar behaviour was also reported earlier. [41][42][43] From this study, it was also observed that [TBA][Br] exhibits higher reaction mixture temperature when compared to [TBA][OAC] in solvent blends. Higher the reaction mixture temperature may lower the viscosity of solvent blends during absorption.…”

“…The constant 0.5Psig pressure of CO 2 inlet gas is passed into the reactor containing solvent blends until the solution reaches saturation. [41][42][43] During absorption process, CO 2 loaded solution was withdrawn at various time intervals and the carbon loading was measured with the help of Chittick apparatus. 41 Physicochemical properties such as pH, solubility of CO 2 (carbon loading), density, surface tension and viscosity were measured before and after completion of the absorption process.…”

Volumetric, Acoustic, and Refractive Behavior of Acid Gas Absorbers: N-Vinyl-2-pyrrolidinone and Glycol Ethers (2-(2-Ethoxyethoxy)ethanol, 2-(2-Butoxyethoxy)ethanol, and 2-(2-(2-Methoxyethoxy)ethoxy)ethanol)

“…All of the basic physicochemical properties of the solvent and CO 2 absorption exhibit interdependent eccentrics. 29 An exhaustive review of the literature reveals that researchers had studied binary mixtures of NVP with water, 7 alcohols, 30 and ionic liquids, 31,32 DEGMEE with N,N-dimethylformamide, 33 ionic liquids, 34 alcohols, 35,36 etc., DEGMBE with water, 37 amines, 38 alcohols, 39 etc., as well as mixtures of TEGMME with water, 40 alcohols, 41 and Nmethyldiethanolamine. 42 But to the best of our knowledge, no literature is available for binary mixtures of NVP with DEGMEE, DEGMBE, and TEGMME, respectively.…”

Carbon dioxide desorption intensified by metal atom

“…[2][3][4][5][6][7] During the chemical absorption process, the solvent significantly influences CO 2 capture performance. [8][9][10][11] Amine solutions, such as monoethanolamine, methyldiethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP)/piperazine solution, and mixture amines, are conventional solvents used to capture CO 2 . In order to characterize the performance of the amine solutions, mathematical modeling analysis and experiment analysis have been usually employed to predict the reaction mechanism, CO 2 fraction distribution, and temperature variation trend.…”

“…Chemical absorption has been developed as one of the most promising methods for industrial CO 2 capture 2‐7 . During the chemical absorption process, the solvent significantly influences CO 2 capture performance 8‐11 …”