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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >CO2 absorption into amine solutions: a novel strategy for intensification based on the addition of ferrofluids
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CO2 absorption into amine solutions: a novel strategy for intensification based on the addition of ferrofluids

机译：吸收到胺溶液中的CO2：基于铁磁流体的强化新策略

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BACKGROUND: In this paper a novel approach for increasing the mass transfer coefficient in gas/liquid mass transfer is reported and applied to the industrially important system of CO2 absorption. The approach makes use of a ferrofluid additive to the liquid phase. To demonstrate this strategy, a wetted wall column has been built and experiments have been conducted on the CO2/methyl diethanolamine (MDEA) system. This reaction system allows the absorption to be carried out in the transition regime between slow and fast regimes, so that the mass transfer coefficient (k(L)) and interfacial area (a(i)) can be measured independently, in the presence and absence of ferrofluids. A surfactant-coated aqueous magnetic fluid was prepared and shown to be stable in MDEA solutions. RESULTS: The experimental results, with this fluid, show that there is an enhancement in mass transfer in the presence of ferrofluids, the extent of which depends on the amount of ferrofluid added. The enhancement in mass transfer coefficient was 92.8% for a volume fraction of the fluid of about 50% (solid magnetite volume fraction of about 0.39%). Experiments were also carried out to further enhance the mass transfer rates by employing a periodic oscillating magnetic field. Under the conditions employed, there was no further impact of magnetic field on mass transfer rates. CONCLUSIONS: Magnetic nanoparticles are able to significantly enhance gas/liquid mass transfer rates when added to the liquid phase. The reasons for this striking effect are under investigation. It is possible for significantly higher enhancements to be produced by the action of an external field, but this requires special fluids to be formulated which are not affected by the chemical solvent used. These results have significance for the absorption of CO2 in industrial absorbers using amine solutions. (C) 2008 Society of Chemical Industry.
机译：背景：本文报道了一种在气/液传质中提高传质系数的新方法，并将其应用于工业上重要的CO2吸收系统。该方法在液相中使用了铁磁流体添加剂。为了证明这一策略，已经建造了一个湿式壁柱，并在CO2 /甲基二乙醇胺（MDEA）系统上进行了实验。该反应系统允许吸收在慢速和快速模式之间的过渡模式下进行，因此可以在存在和存在下分别测量传质系数（k（L））和界面面积（a（i））。缺乏铁磁流体。制备了涂覆有表面活性剂的水性磁性流体，并显示出在MDEA溶液中是稳定的。结果：使用这种流体的实验结果表明，在存在铁磁流体的情况下，传质得到了增强，其程度取决于所添加的铁磁流体的量。对于大约50％的流体体积分数（大约0.39％的固体磁铁矿体积分数），传质系数的提高为92.8％。还通过利用周期性振荡磁场进行了实验以进一步提高传质速率。在所采用的条件下，磁场对传质速率没有进一步的影响。结论：磁性纳米粒子在添加到液相时能够显着提高气体/液体的传质速率。这种惊人效果的原因正在调查中。通过外场的作用可能会产生更高的增强效果，但这需要配制不受所用化学溶剂影响的特殊流体。这些结果对于使用胺溶液吸收工业吸收器中的二氧化碳具有重要意义。 （C）2008年化学工业协会。

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