Experiments and Thermodynamic Modeling of the Solubility of Carbon Dioxide in Three Different Deep Eutectic Solvents (DESs)

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• 作者：Nouman Rafique Mirza ; Nathan J. Nicholas ; Yue Wu ; Kathryn A. Mumford ; Sandra E. Kentish ; Geoffrey W. Stevens
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：November 12, 2015
• 年：2015
• 卷：60
• 期：11
• 页码：3246-3252
• 全文大小：422K
• ISSN：1520-5134

文摘

Carbon capture and storage is needed to reduce the anthropogenic emissions of carbon dioxide (CO₂) in atmosphere. Deep eutectic solvents (DESs), due to their low vapor pressure and environmentally benign nature are possible solvents for the carbon capture step. In the present study, the solubility of CO₂ in three DESs, namely, reline (choline chloride and urea in a 1:2 molar ratio), ethaline (choline chloride and ethylene glycol in a 1:2 molar ratio), and malinine (choline chloride, malic acid, and ethylene glycol in a 1.3:1:2.2 molar ratio) has been studied in a temperature range of (309 to 329) K at pressures up to 160 kPa. Henry鈥檚 constants for CO₂鈥揇ES systems have been determined under these conditions with values in the range of (3.7 to 6.1) MPa (on a molality basis). Thermodynamic modeling using a modified Peng鈥揜obinson equation of state was used to correlate the experimental data. Results showed excellent agreement with a maximum average absolute relative deviation of 1.6% calculated over the complete set of data. The calculated Gibbs free energy, enthalpy of dissolution, and entropy of dissolution show that the CO₂ absorption is exothermic and the entropy of the system falls as a result of gas absorption.