Tailor-made asymmetric PVDF hollow fibers for soluble gas removal
Tailor-made asymmetric PVDF hollow fibers for soluble gas removal
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DOI：
10.1002/aic.690450607
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发表时间：
1999-06-01
期刊：
影响因子：
3.7
通讯作者：
Teo, WK
中科院分区：
文献类型：
--
作者：
Li, K;Kong, JF;Teo, WK
采用特制的聚偏氟乙烯（PVDF）非对称中空纤维膜及其膜组件去除废气中的可溶性气体，如H2S。本研究以10%NaOH水溶液为介质，研究了PVDF非对称中空纤维膜及其膜组件的制备和性能。层流抛物线速度分布被用来表征H2S气体混合物在中空纤维内腔中的流动。从理论和实验两方面研究了操作条件和膜的形态结构对膜系数k（AM）的影响。评价了中空纤维膜从废气流中去除H2S的能力，并与传统的对称疏水中空纤维膜（如聚丙烯）进行了比较。通过分析H2S在PVDF膜中的迁移行为，发现膜的系数k（AM）与吸收实验数据吻合较好，该系数k（AM）是由膜的有效表面孔隙率和平均半径等结构参数计算的。
Tailor-made polyvinylidene fluoride (PVDF) asymmetric hollow-fiber membranes and their membrane modules were employed for soluble gas removal, such as H2S from waste gas streams. This study focused on the techniques of fabricating and characterizing the PVDF asymmetric hollow-fiber membranes and their membrane modules for removal of H2S rising an aqueous solution containing 10% NaOH. A laminar parabolic velocity profile was used to characterize the flow of the H2S gas mixture in the hollow-fiber lumen. Effects of operating conditions and the morphological structures of the membranes on the membrane's coefficient, k(AM), were examined both theoretically and experimentally. The capabilities of the hollow-fiber membranes developed for removal of H2S from waste gas streams were evaluated and compared with conventional symmetric hydrophobic hollow-fiber membranes, such as polypropylene. An analysis of H2S transfer across rite more developed PVDF membranes reveals that the membrane's coefficient, k(AM), evaluated from its structure parameters, such as the effective surface porosity, and mean radius, agreed well with the experimental data obtained from absorption experiments.