Solubility and Characterization of CO2 in 40 mass % N-Ethylmonoethanolamine Solutions: Explorations for an Efficient Nonaqueous Solution

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• 作者：Siming Chen ; Shaoyun Chen ; Xiaoyao Fei ; Yongchun Zhang ; Liang Qin
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 29, 2015
• 年：2015
• 卷：54
• 期：29
• 页码：7212-7218
• 全文大小：373K
• ISSN：1520-5045

文摘

The CO₂ solubility in N-ethylmonoethanolamine (EMEA) solutions was investigated using the vapor鈥搇iquid equilibrium (VLE) and the absorption鈥揹esorption apparatus. A tertiary amine, N,N-diethylethanolamine (DEEA), was used as a novel solvent, and other nonaqueous solvents, diethylene glycol, triethylene glycol, benzyl alcohol, n-butyl alcohol and polyethylene glycol-200, were used for comparison. The EMEA + DEEA solution displayed a much higher CO₂ solubility than other nonaqueous solutions though lower than the EMEA + H₂O solution in the VLE experiment. However, the EMEA + DEEA solution exhibited a higher cyclic absorption capacity than EMEA + H₂O solution in the cyclic absorption鈥揹esorption experiment. The reaction mechanism of EMEA + DEEA + CO₂ was investigated by ¹³C NMR spectroscopy, which indicated that the nonaqueous solvent of DEEA participated in the chemical absorption of CO₂, and thus improved the CO₂ solubility. The tertiary amine DEEA used as a nonaqueous solvent shows more excellent performance than alcohols and glycols.