4.2 Article

Effect of the Presence of MEA on the CO2 Capture Ability of Superbase Ionic Liquids

Journal

JOURNAL OF CHEMICAL AND ENGINEERING DATA
Volume 61, Issue 3, Pages 1092-1100

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jced.5b00710

Keywords

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Funding

  1. Engineering and Physical Sciences Research Council (EPSRC) [EP/K001329/1]
  2. Department of Employment and Learning
  3. EPSRC [EP/K001329/1] Funding Source: UKRI
  4. Engineering and Physical Sciences Research Council [EP/K001329/1] Funding Source: researchfish

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The miscibility of monoethanolamine (MEA) in five superbase ionic liquids (ILs), namely the trihexyl-tetradecylphosphonium benzotriazolide ([P-66614][Bentriz]), trihexyl-tetradecylphosphonium benzimidazolide ([P-66614] [Benzim]), trihexyl-tetradecylphosphonium 1,2,3-triazolide ([P-66614] [123Triz]) trihexyl-tetradecylphosphonium 1,2,4-triazolide ([P-66614] [124Triz]), and trihexyl-tetradecylphosphonium imidazolide ([P66614] [Im]) was determined at 295.15 K using H-1 NMR spectroscopy. The solubility of carbon dioxide (CO2) in equimolar (IL + MEA) mixtures was then studied experimentally using a gravimetric technique at 295.15 K and 0.1 MPa. The effect of MEA on the CO2 capture ability of these ILs was investigated together with the viscosity of these systems in the presence or absence of CO2 to evaluate their practical application in CO2 capture processes. The effect of the presence of MEA on the rate of CO2 uptake was also studied. The study showed that the MEA can enhance CO2 absorption over the ideal values in the case of [P-66614] [123Triz] and [P-66614] [Bentriz] while in the other systems the mixtures behave ideally. A comparison of the effect of MEA addition with the addition of water to these superbase ILs showed that similar trends were observed in each case for the individual ILs studied.

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