CO2/N2 separation by poly(ether block amide) thin film hollow fiber composite membranes
CO2/N2 separation by poly(ether block amide) thin film hollow fiber composite membranes
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DOI：
10.1021/ie050306k
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发表时间：
2005-08-17
影响因子：
4.2
通讯作者：
Feng, XS
中科院分区：
文献类型：
--
作者：
Liu, L;Chakma, A;Feng, XS
开发了用于CO2/N-2分离的聚醚嵌段酰胺（PEBA）中空纤维复合膜，该膜可用于烟气中CO2的捕集，以控制温室气体的排放。通过在微孔聚醚酰亚胺（PEI）中空纤维基底膜上涂覆一薄层PEBA来制备膜。组装实验室规模的中空纤维膜组件，并使用模拟烟道气（15.3%二氧化碳，平衡N-2）作为进料，测试具有各种流动配置的CO2/N2分离。在产品纯度、回收率和生产率方面，具有逆流流动的壳程进料在宽范围的级切割上显示出比其他配置更好的性能。在23 ℃和790 kPa下，在单级操作中以20%的CO2回收率获得含有62 11101%的CO2的渗透物流，而在残余物中可以产生99.4摩尔%的氮气，氮气回收率为36%。结果表明，在相同压力下，CO2在混合气体中的渗透率低于纯CO2的渗透率，而氮气在混合气体和纯气体中的渗透率相差不大。PEBA/PEI薄膜中空纤维复合膜不适用于孔侧进料操作，因为当在纤维腔中施加高压时，与微孔基底中的浓度极化和膜的结构完整性相关的潜在问题。
Thin film poly(ether block amide) (PEBA) hollow fiber composite membranes were developed for CO2/N-2 separation, which is relevant to CO2 capture from flue gas for greenhouse gas emission control. The membrane was prepared by coating a thin layer of PEBA onto microporous polyetherimide (PEI) hollow fiber substrate membranes. Lab-scale hollow fiber membrane modules were assembled and tested for CO2/N2 separation with various flow configurations using a simulated flue gas (15.3% carbon dioxide, balance N-2) as the feed. The shell side feed with counter-current flow was shown to perform better than other configurations over a wide range of stage cuts in terms of product purity, recovery, and productivity. At 23 degrees C and 790 kPa, a permeate stream containing 62 11101 % CO2 was obtained at a CO2 recovery of 20% in a single-stage operation, whereas 99.4 mol % nitrogen could be produced in the residue with a nitrogen recovery of 36%. It was found that the permeance of CO2 in the gas mixture was lower than the permeance of pure CO2 at the same pressure, while there was little difference in nitrogen permeance between pure gas permeation and gas mixture permeation. The PEBA/PEI thin film hollow fiber composite membrane was not suitable for bore side feed operation because of the potential problems associated with concentration polarization in the microporous substrate and the structural integrity of the membrane when a high pressure was applied in the fiber lumen.