CO2 capture from flue gas at high temperatures by new ionic liquids with high capacity
CO2 capture from flue gas at high temperatures by new ionic liquids with high capacity
复制标题
新型高容量离子液体在高温下捕获烟气中的二氧化碳
DOI：
10.1039/c2ra00996j
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发表时间：
2012-01-01
期刊：
影响因子：
3.9
通讯作者：
Liu, Weina
中科院分区：
文献类型：
--
作者：
Ren, Shuhang;Hou, Yucui;Liu, Weina
室温离子液体（ILs）被广泛研究用于从烟道气中捕获CO2，并且可以捕获大量的CO2。然而，几乎所有关于离子液体吸收CO2的研究都是在低温下进行的，低于60 °C，甚至在室温下。当温度达到真实的烟道气温度（从110 °C至140 °C）时，这些离子液体可能几乎不吸收CO2，因为高温降低了CO2容量。因此，有必要设计新的任务特定的离子液体，以捕获具有高吸收能力的烟道气温度下的CO2。本工作开发了一种新型的多胺离子液体，在高温常压下吸收模拟烟气中的CO2，在110 °C时CO2与离子液体的摩尔比可达0.944，质量比可达0.176。这些离子液体可以很容易地通过多胺和有机酸的中和来合成，并且离子液体上的酰胺基的数目可以容易地控制。温度、烟气中CO2的体积分数和离子液体上氨基的数目对CO2的吸收有影响。还提出了CO2吸收的可能机理。
Room-temperature ionic liquids (ILs) are widely investigated to capture CO2 from flue gas and can capture a large amount of CO2. However, almost all of the previous studies on the absorption of CO2 by ILs were carried out at low temperatures, less than 60 °C and even at room temperature. When the temperatures reach the real flue gas temperatures, from 110 °C to 140 °C, these ILs might hardly absorb CO2, as high temperatures decrease the CO2 capacity. Therefore, it is necessary to design new task specific ILs to capture CO2 at flue gas temperatures with high absorption capacity. In this work, a new type of polyamine based ILs were developed to absorb CO2 from simulated flue gas at high temperatures and ambient pressure with large absorption capacities up to 0.944 mole ratio or 0.176 mass ratio of CO2 to IL at 110 °C. These ILs could be easily synthesized by neutralization of polyamines and organic acids, and the number of amido groups on the ILs can be easily controlled. The CO2 absorption is influenced by temperature, CO2 volume fraction in the flue gas, and the number of amido groups on the ILs. Also a possible mechanism for the CO2 absorption has been proposed.