Abstract
The miscibility of monoethanolamine (MEA) in five superbase ionic liquids (ILs), namely the trihexyl-tetradecylphosphonium benzotriazolide ([P66614][Bentriz]), trihexyl-tetradecylphosphonium benzimidazolide ([P66614][Benzim]), trihexyl-tetradecylphosphonium 1,2,3-triazolide ([P66614][123Triz]), trihexyl-tetradecylphosphonium 1,2,4-triazolide ([P66614][124Triz]), and trihexyl-tetradecylphosphonium imidazolide ([P66614][Im]) was determined at 295.15 K using 1H 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 ...
Highlights
Carbon dioxide is a greenhouse gas that is released into the atmosphere from flue gas streams
Five trihexyl-tetradecylphoshonium-based ionic liquids paired with superbasic anions, namely the, 1,2,4triazolide, 1,2,3-triazolide, benzotriazolide, benzimidazolide, and imidazolide were mixed in equimolar amounts with MEA and the effect on the CO2 capture was investigated
The results showed that, depending on the anion structure, the presence of MEA could either increase or decrease the CO2 capture ability
Summary
Carbon dioxide is a greenhouse gas that is released into the atmosphere from flue gas streams. In both emissions and methane containing streams, efficient separation is critical for both economic and environmental reasons To enable these types of separations, industrial practice is currently dominated by aqueous alkanolamine solvents (e.g., 30 wt % aqueous monoethanolamine (MEA)) where a chemical reaction occurs between the CO2 and amine solution. This process is attractive due to the low cost of solvent, high reactivity, and an absorption capacity of 1:2 mol of CO2 per mole of solvent ratio.[2,3] These advantages are offset by the volatile and corrosive nature of the aqueous solvent mixtures and the high energy consumption needed for regeneration with an enthalpy of regeneration of CO2,4 ≈ 66.7−76.9 kJ·mol−1, leading to high operational costs and environmental impact.[5,6] Due to these disadvantages there has been a recent increase in interest in the search for a more suitable solvent for postcombustion CO2 capture
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