Solubility Measurement and Thermodynamic Properties Calculation for Several CO₂ + Ether Absorbent Systems

Abstract

Six physical absorbents with the ether groups were selected for CO2 absorption: tetraethylene glycol dimethyl ether (TEGDME), diethylene glycol monohexyl ether, 2-butoxyethyl ether, triethylene glycol monobutyl ether, ethylene glycol dibutyl ether, and dipropylene glycol dimethyl ether (DPGDME). CO2 solubilities in these absorbents were measured at 273.15 and 283.15 K and 0–1.2 MPa. Henry’s constants of these CO2 + ether absorbent systems were calculated and analyzed at 273.15 K. The ether group is found more powerful than the methylene group, and the ethyl group is more effective than the hydroxyl group to improve the absorption ability of the absorbents. A lower temperature tends to facilitate the absorption process by increasing the absorption ability. Henry’s constants and mass solubilities of the ether absorbents were compared with those of the ionic liquids, common solvents, and other absorbents. TEGDME and DPGDME are potential absorbents according to the evaluation in both mole and mass fraction. The thermodynamic properties, such as entropy, enthalpy, and Gibbs free energy of solution, for CO2 + the ether absorbent systems were calculated and discussed for potential development of corresponding CO2 capture processes.

Rechargeable K‐CO2 Batteries with a KSn Anode and a Carboxyl‐Containing Carbon Nanotube Cathode Catalyst

“…The results reveal that the practical amount of released CO 2 is close to the theoretical value (2501 ppm mAh −1 , see detailed calculations in Supporting Information). The minor difference between the practical and theoretical values can be attributed to the slight dissolution of CO 2 in the ether‐based electrolyte [17] . According to the aforementioned studies, the electrochemical redox reaction at the cathode can be described as 4 K + + 3 CO 2 + 4 e − ⇄ 2 K 2 CO 3 + C.…”

Chemoinformatics-Driven Design of New Physical Solvents for Selective CO2 Absorption

“…A dataset containing mole fraction solubility values (χ) for 280 liquid solvents at 298.15 K and 1 atm was collected (Table S1, Supporting Information) from IUPAC reports, − scientific literature, − and patents. , The mole fraction solubility for a binary (gas–liquid) system is defined as where n (g) is the amount of the dissolved gas and n (l) is the amount of solvent.…”

Rechargeable K‐CO2 Batteries with a KSn Anode and a Carboxyl‐Containing Carbon Nanotube Cathode Catalyst

“…Them inor difference between the practical and theoretical values can be attributed to the slight dissolution of CO 2 in the ether-based electrolyte. [17] According to the aforementioned studies,the electrochemical redox reaction at the cathode can be described as…”