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Frontiers of Chemical Science and Engineering 2024年第4期18卷 97-106页

作者： Ying Li Lu Wang Junyan Xie Yong Dai xuehong gu Xuerui Wang State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Quzhou Membrane Material Innovation Institute Quzhou 324000China

Membrane gas separation is considered an energy-saving technique to extract He from natural gas due to no phase change and room temperature ***,the membrane performance was strongly limited by the trade-off between permeance and ***,novel 4,4′-(hexafluoroisopropylidene)diphthalic anhydride(6FDA)-2,2′-bis(3-amino-4-hydroxyphenyl)hexafluoropropane(APAF)-5-amino-2-(4-aminobenzene)benzimidazole(BIA)asymmetric membranes with a thickness of 300 nm were successfully prepared by the non-solvent induced phase separation *** membrane performance was modulated by regulating dope solution compositions(e.g.,tetrahydrofuran and polymer concentration).The ideal He/CH_(4) selectivity was 124 and the optimized He permeance reached 87 GPU,beyond the current upper ***/CH_(4) selectivity was 75 and He permeance was 73 GPU for the binary mixture feed containing 0.2 mol%*** membrane showed good resistance to CO_(2) and C_(2)H_(6),which are the typical impurities in natural *** 6FDA-APAF-BIA membranes have good stability(>160 h),which can provide great potential in He extraction from natural gas.

关键词： He separation membrane natural gas copolyimide

Helium extraction from natural gas using DD3R zeolite membranes

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Chinese Journal of Chemical Engineering 2022年第9期35卷 122-129页

作者： Ping Zhang Chao Gong Tao Zhou Peng Du Jieyu Song Mengyang Shi Xuerui Wang xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 211816China

Helium(He)is commercially produced from natural gas by low-temperature *** process is energy extensive because of the extremely low He concentration(<0.3%)and the operation at cryogenic *** we demonstrated DD3R zeolite membrane was efficient to extract He from natural gas at atmosphere *** membrane performance was evaluated in terms of temperature,pressure and molar *** overall membrane performance was dominated by the diffusivity *** single He permeance and ideal He/CH_(4) selectivity were 5.8×10^(-9)mol·m^(-2)·s^(-1)·Pa^(-1)and 79 under a feed pressure of 1.3 *** though He concentration was as low as 0.22%,the He permeance and He/CH_(4) mixture selectivity were 3.0×10^(-9)mol·m^(-2)·s^(-1)·Pa^(-1)and 44 at 0.7 *** the longterm operation(~130 h)the membrane performance was stable even the feed mixture containing3.6%ethane as *** results approved the feasibility of DD3R zeolite membranes for He extraction from natural gas.

关键词： He extraction Zeolite Membranes He/CH_(4)separation Natural gas

Mass transfer model,preparation and applications of zeolite membranes for pervaporation dehydration:A review

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Chinese Journal of Chemical Engineering 2017年第11期25卷 1627-1638页

作者： Chun Zhang Li Peng Ji Jiang xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringSynergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 210009China

Pervaporation(including vapor permeation) is a kind of new membrane separation technology, possessing the advantages of high efficiency, energy saving and convenient operation. It has promising application in the separation and purification of organic solvents. Dehydration is an important step in the production and recovery of organic solvents. Zeolite membranes have attracted wide attention for pervaporation dehydration due to their high separation performance and good thermal/chemical stability. So far, zeolite membranes have been preliminarily industrialized for dehydration of organic solvents. This paper reviews the recent development of zeolite membranes for pervaporation dehydration, including mass transfer models, preparation and applications of zeolite membranes. The review also discusses the current industrial applications of zeolite membranes and their future development in pervaporation.

关键词： Zeolite membrane Pervaporation Organic solvent dehydration Mass transfer

Modeling investigation of geometric size effect on pervaporation dehydration through scaled-up hollow fiber NaA zeolite membranes

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Chinese Journal of Chemical Engineering 2018年第7期26卷 1477-1484页

作者： Jiacheng Wang Peng Ye Xuechao Gao Yuting Zhang xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University

A mass transfer model in consideration of multi-layer resistances through Na A zeolite membrane and lumen pressure drop in the permeate side was developed to describe pervaporation dehydration through scaled-up hollow fiber supported NaA zeolite membrane. It was found that the transfer resistance in the lumen of the permeate side is strongly related with geometric size of hollow fiber zeolite membrane, which could not be neglected. The effect of geometric size on pervaporation dehydration could be more significant under higher vacuum pressure in the permeate side. The transfer resistance in the lumen increases with the hollow fiber length but decreases with lumen diameter. The geometric structure could be optimized in terms of the ratio of lumen diameter to membrane length. A critical value of dI/L(R_c) to achieve high permeation flux was empirically correlated with extraction pressure in the permeate side. Typically, for a hollow fiber supported Na A zeolite membrane with length of0.40 m, the lumen diameter should be larger than 2.0 mm under the extraction pressure of 1500 Pa.

关键词：纤维长度几何尺寸沸石膜 NaA 可伸缩脱水模特儿真空压力

Hydrophobic modification of SAPO-34 membranes for improvement of stability under wet condition

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2397-2406页

作者： Rashid Ur Rehman Qingnan Song Li Peng Yang Chen xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 210009China

SAPO-34 zeolite membranes show high efficiency for CO2/CH4 separation but suffer from the reduction of separation performance when exposed to humid *** this work,n-dodecyltrimethoxysilane(DTMS)was used to modify the hollow fibers supported SAPO-34 membranes to increase the external surface hydrophobicity and thus sustain their performance under moisture *** modified membranes were fully *** separation performance was extensively investigated in both dry and wet gaseous systems and compared with the un-modified *** un-modified SAPO-34 membrane exhibited a high separation selectivity of 160 and CO2 permeance of 1.18×10-6 mol·m-2·s-1·Pa-1 for separation of dry CO2/CH4 at 298 ***,its separation selectivity declined to 0.9 and the CO2 permeance was only about 1.7×10-8 mol·m-2·s-1·Pa-1 for wet CO2/CH4 at same *** temperature(e.g.353 K)could reduce the effect of moisture to improve SAPO-34 separation selectivity,but further increasing temperature(e.g.373 K)led to decrease in CO2/CH4 separation selectivity.A significant decrease of selectivity was observed at higher pressure *** modified SAPO-34 membrane showed decreased CO2 permeance but increased separation selectivity for dry CO2/CH4 gas mixture,and super performance for wet CO2/CH4 gas mixture due to the improved hydrophobicity of membrane surface.A separation selectivity of 65 and CO2 permeance of 4.73×10-8 mol·m-2·s-1·Pa-1 for wet CO2/CH4 mixture can be observed at 353 K with a pressure drop of 0.4 ***,the modified membrane exhibited stable separation performance during the 120-hour test for wet CO2/CH4 mixture at 353 *** hydrophobic modification paves a way for SAPO-34 membranes in real applications.

关键词： SAPO-34 membrane CO2/CH4 separation Hydrophobic modification Stability Moisture environment

Preparation of hollow fiber membranes from mullite particles with aid of sintering additives

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Journal of Advanced Ceramics 2021年第1期10卷 78-87页

作者： Hua LIU Jinyun LIU Zhou HONG Shengxian WANG Xuechao GAO xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNo.30 Puzhu Road(S)Nanjing 211816China Nanjing Membrane Materials Industrial Technology Research Institute Co. Ltd.No.1 Yuansi RoadPukou Economic Development ZoneNanjing 211808China

Porous mullite hollow fiber membranes were prepared with a combined phase-inversion and sintering method,using three sintering additives including yttrium stabilized zirconia(YSZ),small mullite particles(SMP),and titanium oxide(TiO2)to promote the particle *** results indicated that all the three additives could improve the sintering performance of mullite hollow fiber membranes due to the decrease in activation energy of mullite *** YSZ and T i02 could react with mullite grains to generate composite oxides(e.g.,ZrSi04 and Al2Ti05)during sintering,following a reaction-sintering ***,the newly generated ZrSiO4 was instable and further decomposed into monoclinic ZrO2 and SiO2 in the sintering *** decomposition could avoid excessive embedment of composite oxides among mullite grains which have negative impact on mechanical strength of mullite hollow ***,the doping of YSZ provided a better promotion effect on the sintering of mullite hollow fiber membranes,where the microstructural and mechanical properties are insensitive to the doping content and sintering temperatures,so it could be used as the candidate for the large-scale preparation of mullite hollow fibers.

关键词： mullite sintering additives hollow fiber membranes sintering behavior

Polydopamine modified Au/FAU catalytic membrane for CO preferential oxidation

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2560-2565页

作者： Li Peng Limin Wang Feng Zhu Jinyun Liu Wenfu Yan xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech University5 Xinmofan RoadNanjing 210009China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China

A hollow-fiber-supported stable Au/FAU catalytic membrane was successfully synthesized through a polydopamine coating modification-removal strategy and used as a flow-through catalytic membrane reactor for preferential oxidation of *** Au nanoparticles can be efficiently isolated by dopamine and the dopamine-derived carbon *** interactions between Au nanoparticles and zeolite layer support are enhanced during annealing at high temperature under an inert atmosphere.A zeolite membrane supported Au nanoparticle catalyst was obtained after the removal of carbon shells,which showed high catalytic activity and stability for the removal of CO from hydrogen.

关键词： Zeolite membrane CO oxidation Gold catalyst Surface modification

Evaluation of hollow fiber T-type zeolite membrane modules for ethanol dehydration

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Chinese Journal of Chemical Engineering 2017年第5期25卷 581-586页

作者： Xuerui Wang Ji Jiang Dezhong Liu Youquan Xue Chun Zhang xuehong gu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemistry and Chemical EngineeringThe Synergetic Innovation Center for Advanced MaterialsNanjing Tech University

This work presents the design of hollow fiber T-type zeolite membrane modules with different geometric configurations. The module performances were evaluated by pervaporation dehydration of ethanol/water mixtures. Strong concentration polarization was found for the modules with big membrane bundles. The concentration polarization was enhanced at high temperature due to the higher water permeation flux. The increase of feed flow could improve water permeation flux for the membrane modules with small membrane *** fluid dynamics was used to visualize the flow field distribution inside of the modules with different configurations. The membrane module with seven bundles exhibited highest separation efficiency due to the uniform distribution of flow rate. The packing density could be 10 times higher than that of the tubular membrane module. The hollow fiber membrane module exhibited good stability for ethanol dehydration.

关键词：中空纤维膜组件乙醇脱水分子筛性能评价 T型计算流体力学几何构型浓差极化

超声辅助溶胶-凝胶法制备中空纤维TiO_(2)超滤膜

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无机材料学报 2022年第10期37卷 1051-1057页

作者：吕庆洋张玉亭顾学红南京工业大学化工学院材料化学工程国家重点实验室南京211816

TiO_(2)膜具有亲水性强和热化学稳定性好等优点而用于超滤分离,但是TiO_(2)膜以管式膜为主,渗透通量低且制备周期长。为了提高TiO_(2)膜的渗透通量,并缩短膜的制备周期,本工作以钛酸四丁酯为前驱体,采用超声辅助溶胶-凝胶法制备高通量... 详细信息

TiO_(2)膜具有亲水性强和热化学稳定性好等优点而用于超滤分离,但是TiO_(2)膜以管式膜为主,渗透通量低且制备周期长。为了提高TiO_(2)膜的渗透通量,并缩短膜的制备周期,本工作以钛酸四丁酯为前驱体,采用超声辅助溶胶-凝胶法制备高通量的中空纤维负载型TiO_(2)超滤膜。系统考察了硝酸与钛酸四丁酯的摩尔比(酸钛比)、超声时间和煅烧温度对TiO_(2)溶胶粒径及膜截留性能的影响。结果表明:当酸钛比为0.25时,溶胶的平均粒径为3252 nm,采用超声处理30 s后,平均粒径减小至1817 nm。采用超声后的溶胶循环涂膜并在350℃煅烧两次后可得到完整无缺陷的中空纤维TiO_(2)超滤膜,膜层平均厚度为1μm,膜的纯水渗透通量为145 L·m^(-2)·h^(-1)·bar^(-1)(1 bar=0.1 MPa),葡聚糖截留分子量为2586 Da,对应的平均孔径为2.5 nm。

关键词：超滤膜溶胶凝胶 TiO_(2) 超声辅助

中空纤维Au-CeZr/FAU催化膜的制备及在富氢气氛CO选择性氧化反应中的应用

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高等学校化学学报 2022年第10期43卷 61-68页

作者：魏李娜彭莉朱锋顾鹏飞顾学红南京工业大学化工学院材料化学工程国家重点实验室南京211816

采用浸渍法制备了一系列不同Ce/Zr掺杂比例的FAU分子筛膜,并进一步负载纳米金,制备了Au-CeZr/FAU催化膜.对催化膜的微观形貌及结构进行了表征,并对其在富氢气氛中催化CO优先氧化性能进行了研究.H_(2)-TPR结果表明,Ce/Zr掺杂比为1∶1时... 详细信息

采用浸渍法制备了一系列不同Ce/Zr掺杂比例的FAU分子筛膜,并进一步负载纳米金,制备了Au-CeZr/FAU催化膜.对催化膜的微观形貌及结构进行了表征,并对其在富氢气氛中催化CO优先氧化性能进行了研究.H_(2)-TPR结果表明,Ce/Zr掺杂比为1∶1时制得的催化膜Au-Ce_(1)Zr_(1)/FAU具有最好的被还原能力,更有利于Au的分散与还原;O_(2)-TPD结果表明,该样品的氧物种比其它样品上的氧物种活性更高.更好的被还原性能和更高的氧物种活性使得制备的Au-Ce_(1)Zr_(1)/FAU催化膜性能最佳,在60℃时CO转化率与O_(2)选择性可以同时达到100%,并且在经过10次热循环测试后仍然可以保持稳定的催化性能.

关键词： CO选择性氧化分子筛催化膜