共查询到18条相似文献,搜索用时 171 毫秒
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气体分离膜以其低能耗,投资小,设备简单,模块化等特点,在许多领域得到应用,如氢气的回收、富氧助燃、富氮、天然气脱湿、有机蒸汽分离。膜法分离气体是分离科学中发展最快的分支之一。 相似文献
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介绍了气体分离膜的基本原理及在炼厂、化工厂尾气中回收氢气的应用.列举了我国石化企业应用的实例,并提出进一步推广应用的建议. 相似文献
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气体膜分离技术在石油工业中的应用 总被引:15,自引:1,他引:14
简要介绍了气体膜分离的基本原理和气体膜分离性能的表征。并着重介绍了气体膜分离技术在石化工业中的应用实例,如从含氢尾气中回收氢气。天然气脱湿;空气分离制取富氧空气或富氮空气以及回收有机蒸气等。 相似文献
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聚醚酰亚胺中空纤维气体分离膜及结构 总被引:5,自引:1,他引:4
以聚醚酰亚胺为膜材料,N—甲基吡咯烷酮为溶剂,采用干/温法纺丝技术制备聚醚酰亚胺中空纤维气体分离膜、研究了不同芯液组成和中空纤维热处理对O2/N2、H2/N2和He/N2膜性能的影响、当芯液组成为m(NMP):m(H2O)=19:1时,涂层的聚醚酰亚胺中空纤维膜气体分离性能如下:αO2/N2=4.22,αHe/N2=83.9,αH2/N2=165,JO2=3.25GPU,JHe=64.6GPU和JH2=127GPU;该膜经过150℃热处理1h后,其气体分离性能如下:αO2/N2=7.57,αHe/N2=304,αH2/N2=512,JO2=0.833GPU,JHe=33.4GPU和JH2=56.3GPU。用扫描电镜对膜结构、中空纤维膜制备中的相转化过程进行了研究,讨论了聚醚酰亚胺中空纤维共混膜的机械性能。 相似文献
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以聚醚共聚酰胺(Pebax)为分离层膜材料,采用浸渍涂覆法制备复合气体分离膜,考察了Pebax复合膜对CH_4、CO_2和H_2S等纯气以及一系列浓度的CO_2/CH_4混合气的渗透分离性能,并采用螺旋卷式膜分离器错流模型模拟分析Pebax气体分离膜用于沼气提纯的技术可行性.实验结果表明,Pebax膜具有较高的CO_2渗透通量和CO_2/CH_4分离系数.由于CO_2的增塑作用,复合膜对CO_2/CH_4混合气的分离系数小于其理想分离系数;不同浓度混合气中CO_2与CH_4的渗透通量随原料气中CO_2分压的增大而增大,而与原料气中CO_2的浓度无关.Pebax单级膜分离的沼气提纯效果受切割比、压力比等操作条件以及原料气组成等因素的影响,通过设计两级Pebax膜分离工艺可将CH_4富集到95%以上,同时回收90%的CH_4,改进膜工艺参数可获得更高的提纯效果,证明Pebax复合气体分离膜用于沼气提纯CH_4是可行的. 相似文献
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通常,气体分离技术是独立开发的。例如,氮是在具有多级精馏塔的大型低温装置中以高纯度回收,或者可用吸收、吸附或膜扩散工艺以中等纯度回收。现在,空气产品和化学制品公司(宾夕法尼亚州,阿伦敦)正在开发一种将膜与深冷工艺结合的综合装置。空气产品公司A. P. Dyer说:“该综合装置在降低投资及操作费用上具有潜力。” 相似文献
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介绍了有机蒸气膜的结构和选择分离原理,重点阐述了有机蒸气膜在石油化工、天然气和石油炼制等工业领域的应用,并以MTR有机蒸气膜为例,结合实际的有机蒸气膜回收装置及有机蒸气回收方案,详细介绍了有机蒸气膜在有机蒸气回收方面的应用. 相似文献
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Jue Hou Huacheng Zhang George P. Simon Huanting Wang 《Advanced materials (Deerfield Beach, Fla.)》2020,32(18):1902009
Advanced porous framework membranes with excellent selectivity and high permeability of small molecules and ions are highly desirable for many important industrial separation applications. There has been significant progress in the fabrication of polycrystalline microporous framework membranes (PMFMs) in recent years, such as metal–organic framework and covalent organic framework membranes. These membranes possess small pore sizes, which are comparable to the kinetic diameter of small molecules and ions on the angstrom scale, very low thickness, down to tens to hundreds of nanometers, highly oriented crystalline structures, hybrid membrane structures, and specific functional groups for enhancing membrane selectivity and permeability. Recent advances in the fabrication methods of advanced PMFMs are summarized. Following this, four emerging separation applications of these advanced microporous framework membranes, including gas separation, water desalination, ion separation, and chiral separation, are highlighted and discussed in detail. Finally, a summary and some perspectives of future developments and challenges in this exciting research field are presented. 相似文献
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Roman Selyanchyn 《Science and Technology of Advanced Materials》2013,14(1):816-827
AbstractEnhancing the fluxes in gas separation membranes is required for utilizing the membranes on a mass scale for CO2 capture. Membrane thinning is one of the most promising approaches to achieve high fluxes. In addition, sophisticated molecular transport across membranes can boost gas separation performance. In this review, we attempt to summarize the current state of CO2 separation membranes, especially from the viewpoint of thinning the selective layers and the membrane itself. The gas permeation behavior of membranes with ultimate thicknesses and their future directions are discussed. 相似文献
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