Thermodynamic and Kinetic Studies of CO₂ Capture by Glycol and Amine-Based Deep Eutectic Solvents

Abstract

Anthropogenic CO 2 emissions into the atmosphere are responsible for the global warming, therefore, it is essential to reduce these emissions at the source. Recently, deep eutectic solvents (DESs) have shown great potential to absorb the CO 2 . In the current study, 15 different types of amine-and glycol-based deep eutectic solvents were synthesized and investigated for CO 2 absorption. In general, aminebased solvents have shown higher CO 2 absorption as compared to glycol based solvents. In particular, the highest CO 2 absorption was observed for the tetrabutyl ammonium bromide and methyldiethanol amine (TBAB/4MDEA) system having a CO 2 solubility of 0.29 (mol CO 2 /mol solvent) at 1 MPa and 303.15 K. Thermophysical properties of all synthesized DESs were estimated using the modified Lydersen−Joback−Reid method and Lee−Kesler mixing rule. Experimental CO 2 solubility data were well fitted using the nonrandom two liquid and the Peng−Robinson thermodynamic models. Apart, CO 2 solubility data were correlated with Henry's law, and Henry's constant was calculated for all DESs. The kinetic modeling of CO 2 absorption in DESs was also studied and rate constants were evaluated.

Solubility of Carbon Dioxide in Deep Eutectic Solvents Based on 3-Amino-1-Propanol and Tetraalkylammonium Salts at Low Pressure

“…CO 2 capture in DESs can be tailored by varying the molar ratio of the hydrogen bond donor, changing the strength of the hydrogen bond between components or by affecting the physical absorption in a form of the size of the HBA. Due to the chemisorption occurring in DESs used in this study, the CO 2 uptake was much higher than in DESs as physical absorbents, such as for example tetrabutylammonium bromide coupled with methyldiethanol that was studied by Haider and gave a capacity of 0.29 moleCO 2 /mole solvent at high pressure of 1 MPa and 303.15 K [ 22 ].…”

“…It has been established that in deep eutectic solvents based on alkanolamines, chemisorption of carbon dioxide occurs [ 22 , 32 ]. The reaction of CO 2 and DESs results from the content of primary alkanolamine AP and the reactions of its functional groups −NH 2 and −OH: −NH 2 + CO 2 = −NHCOO − H + −OH + CO 2 = −OCOO − H + …”

“…Additionally, they concluded that as a molar ratio of amine increases, the solubility of CO 2 also increases. Haider et al [ 22 ] described the influence of HBAs (ChCl and TBAB) on carbon dioxide absorption in ethylene glycol (EG), diethylene glycol (DEG), MDEA and DEA-based DESs. The authors reported that the highest absorption was obtained in TBAB-based DESs which was explained due to increase in free volume in TBAB-based DESs in comparison to ChCl-based DESs.…”

Impact of Low Salinity Water Injection on CO2 Storage and Oil Recovery for Improved CO2 Utilization

“…The amount of CO 2 absorption (in moles/kg of solvent) in the saline solutions was measured using a well-established approach (Chaturvedi et al, 2018;Haghtalab et al, 2015;Haider et al, 2018). First, the confining pressure of 4, 8, or 12 bar (applied on the CO 2 molecules in the reservoir cell) was established using the pressure gauge and was used to calculate the number of CO 2 moles initially in the reservoir cell.…”

Effect of Hydrogen Bond Donors and Acceptors on CO2 Absorption by Deep Eutectic Solvents

“…Several studies on gas solubility in DES with ionic liquids are being used as HBA [30,[44][45][46][47]. In contrast with DES, only a handful of studies use NADES for CO 2 solubilities; these studies focus mainly on choline chloride as HBA mixed with glycerol/propanediol/malic acids [34] and monoethanolamine [48]. In our previous work, we studied gas absorption performances via novel NADES, which was obtained by considering choline chloride (ChCl), alanine (Al), and betaine (Be) as HBA, and lactic acid (La), malic acid (Ma), and phenylacetic acid (Paa) as HBD.…”