Investigation of the Solubilities of Carbon Dioxide in Some Low Volatile Solvents and Their Thermodynamic Properties

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• 作者：Xiaofeng Li ; Yaotai Jiang ; Guoqiang Han ; Dongshun Deng
• 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：1254-1261
• 全文大小：386K
• ISSN：1520-5134

文摘

Solubilities of CO₂ have been measured in five low volatile organic solvents at temperatures ranging from 293.15 to 323.15 K with 10K intervals under a pressure of 0 to 600.0 kPa using an isochoric saturation method. These organic solvents were selected from γ-butyrolactone (GBL), butyl lactate (BL), 1,1,3,3-tetramethylurea (TMU), 1,3-dimethyl-2-imidazolidinone (DMI), and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU). Henry’s constants and thermodynamic properties such as Gibbs free energy, enthalpy, and entropy of dissolution were derived from the corresponding solubility data. The gravimetric solubilities of CO₂ in these solvents followed the sequence of TMU > DMI ≈ BL ≈ GBL > DMPU. The enthalpies of dissolution were all exothermal at each condition. Henry’s constants of CO₂ in these solvents were further compared with those in ionic liquids and other ordinary absorbents, and it was found that they were similar to that of CO₂ in polyethylene glycol dimethyl ether (NHD), which is widely used in the present industry.