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Spectroscopic analysis of CO2 Solubility in DBU Ionic Liquids: Synthesis, Experimental and COSMO-RS Study
  • Dr. Venkatramana Losetty,
  • Cecilia Devi Wilfred
Dr. Venkatramana Losetty
Vel Tech Rangarajan Dr Sagunthala R&D Institute of Science and Technology
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Cecilia Devi Wilfred
Universiti Teknologi PETRONAS
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Abstract

In this study, four DBU based ILs namely [DBU][Ac], [DBU][TFA], [DBU][MSA] and [DBU][TFMSA] (1,8-diazabicyclo[5.4.0]undec-7-ene as cation and acetate, trifluoroacetate, methanesulfonate and trifluoromethanesulfonate as anions) were synthesized for CO2 capture. The neat and dried ILs was characterized by 1H NMR and 13C NMR spectroscopic methods. The systematic analysis of CO2 solubility in ILs was performed at 10 bar, 15 bar and 20 bar pressure and at T=(303.15 and 313.15) K. Among the four ILs, [DBU][Ac] showed highest CO2 sorption efficiency (0.7992 mol/mol IL at 20 bar pressure and at 303.15 K) due to the formation of new compound during the absorption process. From the experimental data (pressure-concentration-temperature), Henry’s constant (KH) was predicted to calculate the absorption tendency of ILs. The sign and magnitude of thermodynamic properties such as Henry’s constant (KH), Gibbs free energy (ΔGo), enthalpy (ΔHo) and entropy (ΔSo) reveals the CO2 sorption efficiency.