TY - JOUR

T1 - Screening of Lithium‐Based Salts in Non‐Aqueous Electrolyte Solution of Monoethanolamine for Carbon Dioxide Capture

AU - Ismail, Aisyah Ilyani

AU - Kassim, Mohd Azlan

AU - Aroua, Mohamed Kheireddine

PY - 2025/7/2

Y1 - 2025/7/2

N2 - This study investigates the screening of lithium-based salts in non-aqueous electrolyte solutions of monoethanolamine (MEA) for potential use in integrated carbon capture and conversion (ICCC) technology. Experimental measurements of density, viscosity, nitrous oxide (N 2O) solubility, and CO 2 solubility were conducted for various lithium salts, including lithium chloride (LiCl), lithium bromide (LiBr), and lithium nitrate (LiNO 3), in MEA–dimethyl sulfoxide (DMSO) system at 303.15 K at different CO 2 pressures ranging from 344 to 1379 kPa. The results indicated that the addition of lithium salts to the amine solution significantly enhances CO 2 absorption capacity, exceeding the benchmark value of 0.5 mol CO 2/mol MEA typically reported for 5 M MEA aqueous systems. The highest CO 2 solubility in the system was observed following the order 2 M MEA + 0.5 M LiBr < 2 M MEA + 0.5 M LiNO 3 < 2 M MEA + 0.5 M LiCl in DMSO with corresponding values of 1.2213, 1.2801, and 1.3381 mol CO 2/mol MEA, respectively, identifying LiCl as the most effective additive. It was also found that using DMSO as an organic solvent greatly enhanced the CO 2 absorption capacity compared to water, evidenced by Henry's law constant determined using N 2O analogy, in addition to its lower sensible heat than water. The findings demonstrate that MEA in organic solvent shows a promising performance in CO 2 capture, with CO 2 loading higher than the industrial standard (<0.5 mol CO 2/mol MEA). Ultimately, the screening process outlined in this study serves as a foundation for future research aimed at optimizing electrolyte formulations for enhanced carbon capture efficiency.

AB - This study investigates the screening of lithium-based salts in non-aqueous electrolyte solutions of monoethanolamine (MEA) for potential use in integrated carbon capture and conversion (ICCC) technology. Experimental measurements of density, viscosity, nitrous oxide (N 2O) solubility, and CO 2 solubility were conducted for various lithium salts, including lithium chloride (LiCl), lithium bromide (LiBr), and lithium nitrate (LiNO 3), in MEA–dimethyl sulfoxide (DMSO) system at 303.15 K at different CO 2 pressures ranging from 344 to 1379 kPa. The results indicated that the addition of lithium salts to the amine solution significantly enhances CO 2 absorption capacity, exceeding the benchmark value of 0.5 mol CO 2/mol MEA typically reported for 5 M MEA aqueous systems. The highest CO 2 solubility in the system was observed following the order 2 M MEA + 0.5 M LiBr < 2 M MEA + 0.5 M LiNO 3 < 2 M MEA + 0.5 M LiCl in DMSO with corresponding values of 1.2213, 1.2801, and 1.3381 mol CO 2/mol MEA, respectively, identifying LiCl as the most effective additive. It was also found that using DMSO as an organic solvent greatly enhanced the CO 2 absorption capacity compared to water, evidenced by Henry's law constant determined using N 2O analogy, in addition to its lower sensible heat than water. The findings demonstrate that MEA in organic solvent shows a promising performance in CO 2 capture, with CO 2 loading higher than the industrial standard (<0.5 mol CO 2/mol MEA). Ultimately, the screening process outlined in this study serves as a foundation for future research aimed at optimizing electrolyte formulations for enhanced carbon capture efficiency.

U2 - 10.1002/ghg.2362

DO - 10.1002/ghg.2362

M3 - Journal article

JO - Greenhouse Gases: Science and Technology

JF - Greenhouse Gases: Science and Technology

SN - 2152-3878

M1 - e2362

ER -