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化工学报  2014 

负载[APMIm][Br]离子液体吸收CO2的性能

DOI: 10.3969/j.issn.0438-1157.2014.05.022, PP. 1716-1720

Keywords: 1-氨丙基-3-甲基咪唑溴盐,CO2,离子液体,载体,吸收

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Abstract:

1-氨丙基-3-甲基咪唑溴盐([APMIm][Br])离子液体通过化学反应捕集CO2。采用浸渍-蒸发将[APMIm][Br]离子液体负载在硅胶表面,通过比表面孔隙吸附测定仪、热重分析仪(TGA)对吸收剂的结构与性能进行研究,负载量为10%~50%,温度为303.15~323.15K,CO2浓度分别为10%、30%、50%。结果表明:硅胶表面的离子液体薄膜厚度达到86nm(负载40%)时,具有最快的吸收速率,且受CO2浓度和温度变化的影响较小,平衡吸收量在50%CO2体系中达到理论吸收量的80%,随着温度的升高而降低,当负载量为50%时,膜厚增加到230nm,导致吸收速率和平衡吸收量大幅度下降。值得注意的是:负载离子液体吸收剂在循环使用3次之后,结构与性能均保持不变,表现出一定的工业运用前景。

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