biostudies-literatureUnknown13(21)Ab Rahim AHA series of ammonium-based protic ionic liquids (APILs) namely ethanolammonium pentanoate [ETOHA][C5], ethanolammonium heptanoate [ETOHA][C7], triethanolammonium pentanoate [TRIETOHA][C5], triethanolammonium heptanoate [TRIETOHA][C7], tributylammonium pentanoate [TBA][C5] and tributylammonium heptanoate [TBA][C7] was synthesized <i>via</i> proton transfer. Their structural confirmation and physiochemical properties namely thermal stability, phase transition, density, heat capacity (<i>C</i>_p) and refractive index (RI) have been determined. Specifically, [TRIETOHA] APILs have crystallization peaks ranging from -31.67 to -1.00 °C, owing to their large density values. A comparison study revealed the low <i>C</i>_p values of APILs in comparison to monoethanolamine (MEA) which could be advantageous for APILs to be used in CO₂ separation during recyclability processes. Additionally, the performance of APILs toward CO₂ absorption was investigated by using a pressure drop technique under a pressure range of 1-20 bar at 298.15 K. It was observed that [TBA][C7] recorded the highest CO₂ absorption capacity with the value of 0.74 mole fraction at 20 bar. Additionally, the regeneration of [TBA][C7] for CO₂ absorption was studied. Analysis of the measured CO₂ absorption data showed marginal reduction in the mole fraction of CO₂ absorbed between fresh and recycled [TBA][C7] thus proving the promising potential of APILs as good liquid absorbents for CO₂ removal.RSC advances14268-14280https://www.ebi.ac.uk/biostudies/studies/S-EPMC10168136biostudies-literatureSynthesis and characterization of ammonium-based protic ionic liquids for carbon dioxide absorption.PMC10168136Abd Ghani NAb Rahim AHYunus NMOthman Zailani NZAllim MFMohd Fariddudin SAJaffar ZUmar MfalseSynthesis and characterization of ammonium-based protic ionic liquids for carbon dioxide absorption.A series of ammonium-based protic ionic liquids (APILs) namely ethanolammonium pentanoate [ETOHA][C5], ethanolammonium heptanoate [ETOHA][C7], triethanolammonium pentanoate [TRIETOHA][C5], triethanolammonium heptanoate [TRIETOHA][C7], tributylammonium pentanoate [TBA][C5] and tributylammonium heptanoate [TBA][C7] was synthesized <i>via</i> proton transfer. Their structural confirmation and physiochemical properties namely thermal stability, phase transition, density, heat capacity (<i>C</i>_p) and refractive index (RI) have been determined. Specifically, [TRIETOHA] APILs have crystallization peaks ranging from -31.67 to -1.00 °C, owing to their large density values. A comparison study revealed the low <i>C</i>_p values of APILs in comparison to monoethanolamine (MEA) which could be advantageous for APILs to be used in CO₂ separation during recyclability processes. Additionally, the performance of APILs toward CO₂ absorption was investigated by using a pressure drop technique under a pressure range of 1-20 bar at 298.15 K. It was observed that [TBA][C7] recorded the highest CO₂ absorption capacity with the value of 0.74 mole fraction at 20 bar. Additionally, the regeneration of [TBA][C7] for CO₂ absorption was studied. Analysis of the measured CO₂ absorption data showed marginal reduction in the mole fraction of CO₂ absorbed between fresh and recycled [TBA][C7] thus proving the promising potential of APILs as good liquid absorbents for CO₂ removal.2023-01-01T00:00:00Z2023 May2025-04-22T05:08:48.788Z2025-04-05T21:17:42.295ZS-EPMC101681363717999410.1039/d3ra01345f