Absorption of CO2 into Aqueous Potassium Salt Solutions of l-Alanine and l-Proline

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• 作者：Jin-ah Lim ; Dong Hyun Kim ; Yeoil Yoon ; Soon Kwan Jeong ; Ki Tae Park ; Sung Chan Nam
• 刊名：Energy & Fuels
• 出版年：2012
• 出版时间：June 21, 2012
• 年：2012
• 卷：26
• 期：6
• 页码：3910-3918
• 全文大小：463K
• 年卷期：v.26,no.6(June 21, 2012)
• ISSN：1520-5029

文摘

Aqueous potassium salt solutions of l-alanine and l-proline were investigated as carbon dioxide (CO₂) absorbents. The CO₂ absorption capacities and absorption heats (鈭捨?i>H_abs) of the aqueous amino acid salts were measured in a semi-batch absorption system and differential reaction calorimeter (DRC). The solution experiments tested concentrations of 2.5 M and were carried out at 298 and 313 K. The ¹³C and ¹H nuclear magnetic resonance (NMR) spectra were used to identify the species distributions in the CO₂-loaded absorbents. The absorption properties were compared to those of the commercial monoethanolamine (MEA) absorbent, revealing that the CO₂ loading capacity was higher than that of MEA (0.68 mol of CO₂/mol of solute for the potassium salt of l-alanine > 0.5 mol of CO₂/mol of solute for MEA). The absorption heat was lower than that of MEA at 298 K (53.26 kJ/mol of CO₂ for the potassium salt of l-alanine < 81.77 kJ/mol of CO₂ for MEA).