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

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• 作者：Corina McCrellis ; S. F. Rebecca Taylor ; Johan Jacquemin ; Christopher Hardacre
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：March 10, 2016
• 年：2016
• 卷：61
• 期：3
• 页码：1092-1100
• 全文大小：349K
• ISSN：1520-5134

文摘

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 the case of [P₆₆₆₁₄][123Triz] and [P₆₆₆₁₄][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.