Hybrid fixed-site-carrier membranes for CO2 removal from high pressure natural gas: Membrane optimization and process condition investigation
Hybrid fixed-site-carrier membranes for CO2 removal from high pressure natural gas: Membrane optimization and process condition investigation
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DOI：
10.1016/j.memsci.2014.07.016
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发表时间：
2014-11
影响因子：
9.5
通讯作者：
Xuezhong He;Taek-Joong Kim;May‐Britt Hägg
中科院分区：
文献类型：
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作者：
Xuezhong He;Taek-Joong Kim;May‐Britt Hägg
通过在聚砜（PSf）超滤膜顶部涂覆碳纳米管（CNT）增强聚乙烯胺（PVAm）/聚乙烯醇（PVA）共混选择性层制备混合固定位点载体（FSC）膜。系统研究了载体膜制备参数、热处理条件和铸膜液pH值对膜分离性能的影响。根据高压气体渗透测试，在最佳条件（PSf 20 K − 95 °C − 0.75 h – pH 10）下制备的混合 FSC 膜表现出较高的 CO2 渗透性和相对较好的 CO2/CH4 选择性。此外，进料压力、温度、进料CO2浓度、进料流量以及水蒸气含量等工艺操作参数被发现显着影响膜性能，在实际应用中需要对其进行优化。另外还测试了具有相对较大膜面积（110-330 cm2）的小型中试规模模块。研究结果可用于指导未来工作中使用所开发的 FSC 膜去除高压天然气过程中二氧化碳的过程模拟和经济可行性分析。
The hybrid fixed-site-carrier (FSC) membranes were prepared by coating the carbon nanotubes (CNTs) reinforced polyvinylamine (PVAm)/polyvinylalcohol (PVA) blend selective layer on the top of the polysulfone (PSf) ultrafiltration membranes. The influences of membrane preparation parameters of support, heat treatment condition and pH value of casting solution on the membrane separation performance were systematically investigated. The hybrid FSC membranes prepared under the optimal condition (PSf 20 K − 95 °C − 0.75 h – pH 10) showed high CO2permeance and relatively good CO2/CH4selectivity based on high pressure gas permeation testing. Moreover, process operating parameters such as feed pressure, temperature, feed CO2concentration, and feed flow rate as well as water vapor content were found to significantly affect the membrane performance, which need to be optimized in the real application. Small pilot-scale modules with relatively large membrane areas (110–330 cm2) were additionally tested. The results could be used to guide process simulation and economic feasibility analysis of CO2removal from high pressure natural gas process with the developed FSC membranes in the future work.