A study of mass transfer resistance in membrane gas-liquid contacting processes
A study of mass transfer resistance in membrane gas-liquid contacting processes
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DOI：
10.1016/j.memsci.2005.07.025
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发表时间：
2006-03-15
影响因子：
9.5
通讯作者：
Sakellaropoulos, GP
中科院分区：
文献类型：
--
作者：
Mavroudi, M;Kaldis, SP;Sakellaropoulos, GP
考察了膜吸收水中二氧化碳时传质阻力随时间的变化。使用商业聚丙烯中空纤维膜组件，其中气体流动通过腔侧，液体横向流动在壳侧。实验进行了很长一段时间，以评估吸收性能。吸收通量随着时间的推移显着下降，由于发展阻力传质。然而，膜干燥后，初始通量值恢复，表明额外的阻力是可逆的。建立了一个理论模型，分析和预测磁通随时间的恶化，在串联的部分电阻。对纯气体传质的阻力被认为是液相阻力和膜阻力的总和;后者是由气体或液体或两者填充膜孔引起的。壳程传质关联式用于预测液相阻力。实验吸收通量随时间的下降是由于液体逐渐部分填充孔，它被用来估计膜阻力的大小及其随时间的变化。模型预测，与实验结果吻合良好，允许液体渗透到膜基质的估计。虽然这相对较低（类似于13%），但所得到的液体填充孔的阻力占膜阻力的98%以上，占总吸收阻力的20-50%。(c)2005 Elsevier B. V.保留所有权利。
The change of mass transfer resistance with time has been examined for membrane-based carbon dioxide absorption in water. A commercial polypropylene hollow fiber membrane module was used with gas flow through the lumen side and liquid cross-flow on the shell side. Experiments were carried out for a prolonged period of time to evaluate absorption performance. Absorption flux decreased significantly with time due to a developing resistance to mass transfer. However, the initial flux value was restored after membrane drying, indicating that the additional resistance was reversible. A theoretical model was developed to analyze and predict flux deterioration with time in terms of partial resistances in series. The resistance against pure gas mass transfer was considered to be the sum of the liquid phase resistance and the resistance of the membrane; the latter arises from membrane pore filling by gas or liquid or both. A shell side mass transfer correlation was used for the prediction of the liquid phase resistance. The experimental absorption flux decline with time was attributed to gradual partial pore filling by liquid, and it was used to estimate the magnitude of the membrane resistance and its temporal variation. Model predictions, in good agreement with experimental results, permitted the estimation of liquid penetration into the membrane matrix. Although this was relatively low (similar to 13%), the resulting resistance of the liquid-filled pores accounted for over 98% of the membrane resistance and for 20-50% of the total resistance to absorption. (c) 2005 Elsevier B.V. All rights reserved.