Regeneration performance of amino acid ionic liquid (AAIL) activated MDEA solutions for CO2 capture
Regeneration performance of amino acid ionic liquid (AAIL) activated MDEA solutions for CO2 capture
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用于 CO2 捕获的氨基酸离子液体 (AAIL) 活化 MDEA 溶液的再生性能
DOI：
10.1016/j.cej.2013.03.005
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发表时间：
2013-05
影响因子：
15.1
通讯作者：
Zhang Zhi-Bing
中科院分区：
文献类型：
--
作者：
Zhang Feng;Gao Yuan;Wu Xian-Kun;Ma Jing-Wen;Wu You-Ting;Zhang Zhi-Bing
研究了氨基酸离子液体(AAIL)活化的N-甲基二乙醇胺(MDEA)溶液的再生性能，考察了溶液组成、再生温度对再生效率和再生溶液吸收率的影响。三种高浓度水溶液：15wt%[N1111][Gly](四甲基甘氨酸四甲铵)+30wt%MDEA、10wt%[N1111][Gly]+30wt%MDEA饱和后，分别在363K、373K和378K再生。结果表明，在溶液沸腾(约378K)之前，液相中的大部分CO2是通过热再生释放出来的。再生温度越高，再生溶液中CO2的吸收率越高，说明再生温度越高，可更新的[N1111][Gly]越多。在较宽的平衡压力范围内(0-300kPa)，再生溶液对CO2的吸附实验表明，在相同的压力下，再生温度越高，再生溶液对CO2的吸附能力越高，378K下再生溶液的吸收曲线与新鲜溶液相近，尤其是当CO2平衡分压低于50kPa时。考虑再生溶液的再生效率和吸收速率与空白溶液的差异，可以得出结论：在CO2负荷中占主导地位的MDEA是完全再生的，而决定吸收额定值的大部分IL是更新的。
The regeneration performance of amino acid ionic liquid (AAIL) activated N-methyldiethanolamine (MDEA) solutions was investigated to evaluate the influence of solution composition, regeneration temperature on the regeneration efficiencies and absorption rate of renewed solutions. Three high concentrated aqueous solutions: 15wt% [N1111][Gly] (tetramethylammonium glycinate)+30wt% MDEA, 10wt% [N1111][Gly]+30wt% MDEA and 10wt% [N1111][Gly]+40wt% MDEA were saturated and then regenerated under the regeneration temperature: 363K, 373K and 378K, respectively. The results reveal that most of CO2in the liquid phase is released through the thermal regeneration before solution boiling (about 378K). And higher regeneration temperature causes higher absorption rates of CO2in the regeneration solutions, indicating that more [N1111][Gly] can be renewed under higher regeneration temperature. Absorption of CO2in the regenerated absorbents over a wide range of equilibrium pressure (0–300kPa) shows that under the same pressure, the higher regeneration temperature leads to the high CO2absorption capacity of the regenerated solutions, and the absorption curves of the solutions regenerated at 378K are close to those of the fresh solutions, especially when the equilibrium partial pressure of CO2is lower than 50kPa. Considering the regeneration efficiency and absorption rate difference between regenerated solutions and the blank, it can be concluded that MDEA which dominates CO2load is fully regenerated, while most IL which determines the absorption rated is renewed.
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