Viscosities and Carbon Dioxide Solubilities of Guanidine Carbonate and Malic Acid-Based Eutectic Solvents

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• 作者：Nouman R. Mirza ; Nathan J. Nicholas ; Yue Wu ; Kathryn H. SmithSandra E. Kentish ; Geoffrey W. Stevens
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：62
• 期：1
• 页码：348-354
• 全文大小：462K
• ISSN：1520-5134

文摘

Carbon capture and storage (CCS) is one of the technologies needed to reduce anthropogenic emissions of CO₂ in the atmosphere. Protic ionic liquids (PILs) are potential nonaqueous solvents that can combine the benefits of ionic liquids (ILs) and deep eutectic solvents (DESs) to make the carbon capture process more sustainable. In the present study, the viscosities of six eutectic-based solvents have been measured within a temperature range of 303.2–330.2 K and have been modeled using a Vogel–Fulcher–Tammann (VFT)-type equation. The results showed that guanidium malate-based eutectic solvents have significantly lower viscosities than most other deep eutectic solvents. Additionally, CO₂ solubilities in three different guanidium-based eutectic solvents have been measured within a temperature range of 313.2–333.2 K and pressures of up to 200 kPa. Henry’s law constants of CO₂ in pure solvents were obtained by modeling the solubility in mixed (aqueous) solvents. The values obtained for Henry’s law constants of CO₂ in the studied guanidium-based eutectic solvents were found to lie within a range of 1.3–24 MPa. The values of the Gibbs free energy and the dissolution enthalpy and entropy showed that the CO₂ absorption is exothermic, and after CO₂ absorption, the entropy of the systems decreased.