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首页> 外文OA文献 >Microporous hollow fibre membrane modules as gas-liquid contactors. Part 1: Physical mass transfer processes. A specific application: mass transfer in highly viscous liquids
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Microporous hollow fibre membrane modules as gas-liquid contactors. Part 1: Physical mass transfer processes. A specific application: mass transfer in highly viscous liquids

机译：微孔中空纤维膜组件作为气液接触器。第1部分：物理传质过程。一个特定的应用：在高粘度液体中的传质

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Gas-liquid mass transfer has been studied in a membrane module with non-wetted microporous fibres in the laminar flow regime. This new type of gas/liquid contactor can be operated stabily over a large range of gas and liquid flows because gas and liquid phase do not influence each other directly. Therefore foam is not formed in the module, gas bubbles are not entrained in the liquid flowing out of the reactor and the separation of both phases can be achieved very easily. These phenomena often limit the applicability of conventional contactors, e.g. a bubble column which was also studied in the present work. The large mass transfer area of a bundle of small fibres offers the possibility of creating a compact gas/liquid mass exchanger. However, owing to the small channels in and around the fibres the flow of either gas or liquid becomes laminar which reduces the mass transfer capacity of the module. Therefore the mass transfer coefficients in the laminar flow regime were determined experimentally. For mass transfer determined by the transport in the liquid phase it was found that the active mass transfer area is equal to the total membrane area, regardless the porosity of the fibre. For processes with liquid flowing through the fibres, the influence of fibre diameter, diffusivity in the liquid, liquid viscosity and liquid velocity on mass transfer can be correlated extremely well with the Graetz-Lévèque solution derived for the analogous case of heat transfer. For liquid flowing around regularly packed fibres mass transfer was described satisfactory with a correlation derived from a numerical solution for the similar heat transfer problem [Miyatake and Iwashita, Int. J. Heat Mass Transf., 33 (1990) 416]. Correlating mass transfer in liquid flowing around irregularly packed fibres was not possible because of the undefined dimensions of the different channels between the fibres.
机译：已经在层流状态下在具有未润湿的微孔纤维的膜组件中研究了气液传质。这种新型的气/液接触器可以在很大的气体和液体流量范围内稳定运行，因为气相和液相不会直接相互影响。因此，在模块中不会形成泡沫，气泡不会夹带在流出反应器的液体中，并且可以非常容易地实现两相的分离。这些现象通常限制了常规接触器的适用性，例如，传统的接触器。气泡柱，在本工作中也进行了研究。一束小纤维的大质量传递面积提供了形成紧凑的气/液质量交换器的可能性。但是，由于纤维中和纤维周围的通道小，气体或液体的流动变得层流，这降低了模块的传质能力。因此，实验确定了层流状态下的传质系数。对于通过液相中的传输确定的质量传递，发现有效的质量传递面积等于总膜面积，而与纤维的孔隙率无关。对于液体流过纤维的过程，纤维直径，液体中的扩散率，液体粘度和液体速度对传质的影响可以与类似传热情况下得出的Graetz-Lévèque溶液很好地关联。对于在规则堆积的纤维周围流动的液体，传质令人满意，其相关性源自类似传热问题的数值解[Miyatake and Iwashita，Int。 J. Heat Mass Transf。，33（1990）416]。由于纤维之间不同通道的尺寸不确定，因此不可能在不规则堆积的纤维周围流动的液体中进行相关的质量传递。

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