Absorption of CO sub(2) into Aqueous Potassium Salt Solutions of l-Alanine and l-Proline
Aqueous potassium salt solutions of l-alanine and l-proline were investigated as carbon dioxide (CO sub(2)) absorbents. The CO sub(2) absorption capacities and absorption heats (- Delta H sub(abs)) of the aqueous amino acid salts were measured in a semi-batch absorption system and differential react...
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Veröffentlicht in: | Energy & fuels 2012-06, Vol.26 (6), p.3910-3918-3910-3918 |
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Sprache: | eng |
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Zusammenfassung: | Aqueous potassium salt solutions of l-alanine and l-proline were investigated as carbon dioxide (CO sub(2)) absorbents. The CO sub(2) absorption capacities and absorption heats (- Delta H sub(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 super(13)C and super(1)H nuclear magnetic resonance (NMR) spectra were used to identify the species distributions in the CO sub(2)-loaded absorbents. The absorption properties were compared to those of the commercial monoethanolamine (MEA) absorbent, revealing that the CO sub(2) loading capacity was higher than that of MEA (0.68 mol of CO sub(2)/mol of solute for the potassium salt of l-alanine > 0.5 mol of CO sub(2)/mol of solute for MEA). The absorption heat was lower than that of MEA at 298 K (53.26 kJ/mol of CO sub(2) for the potassium salt of l-alanine < 81.77 kJ/mol of CO sub(2) for MEA). |
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ISSN: | 0887-0624 1520-5029 |
DOI: | 10.1021/ef300453e |