功能离子液体复配溶液吸收CO_2性能研究

Performance of Carbon Dioxide Absorption in Mixed Aqueous Solution of Monoethanolamine and Tetramethylammonium Glycin

采用酸碱中和一步法制备出四甲基铵甘氨酸([N1111][Gly])功能离子液体,并进行~1H NMR和TGA表征。通过[N_(1111)][Gly]与单乙醇胺(MEA)水溶液复配成混合吸收剂,研究了不同复配浓度、温度、压力对CO_2的吸收性能的影响。结果表明;在MEA溶液中添加[N_(1111)][Gly]功能离子液体可以提高吸收CO_2的速率,在本文采用的5种吸收剂中,0.3mol·L-[N_(1111)][Gly|与0.7 mol·L^(-1)MEA复配形成的吸收剂具有较高的吸收容量和较大的吸收速率。温度升高,混合吸收剂吸收CO_2的速率增加,但平衡时的吸收容量减小。混合吸收剂的CO_2吸收速率和吸收容量均随压力的升高而增加。

One functional ionic Uquid-tetramethylammonium glycin([N_(1111)][Gly]) were synthesized by using the acid-base neutralization one-step method.~1H NMR and TGA were used to determine the structure and properties of the ionic liquid.Absorption of carbon dioxide into the mixed aqueous solution of monoethanolamine(MEA) and[N_(1111)][Gly]was investigated with different proportion of[N_(1111)][Gly]and MEA,temperature and pressure.The results indicated that the ionic liquid-[N_(1111)][Gly]could greatly enhance absorption rate of carbon dioxide in MEA aqueous solutions.The maximal absorption rate and the saturated absorption capacity of 0.3 mol·L^(-1)[N__(1111)][Gly]+ 0.7mol·L^(-1) MEA aqueous solutions were higher than the other used in this work.With the increasing of temperature,the carbon dioxide absorption rate increased,however,the saturated absorption capacity decreased.Increasing the gas pressure,the carbon dioxideabsorption rate and saturated absorption capacity both increased.