共查询到20条相似文献,搜索用时 125 毫秒
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酸处理Silicalite—Ⅰ沸石填充硅橡胶渗透蒸发分离膜 总被引:1,自引:1,他引:0
研究酸处理Slilicalite-Ⅰ沸石对有机溶剂、水的吸附、脱附性质,酸处理Silicalite-Ⅰ填充硅橡胶对低浓度有机溶剂水溶液的渗透蒸发分离性能以及填充膜的力学性能。实验结果表明,在硅橡胶胶膜中填充酸处理Silicalite-Ⅰ沸石能改善膜对有机溶剂-水混合物的分离性能,且分离性能的改善与沸石在膜中的填充量以及硅橡胶的品种有关。另外,沸石的填充也有利于改善膜的力学性能。 相似文献
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沸石分子筛复合膜的制备及其分离水中微量苯酚和苯的性能 总被引:1,自引:0,他引:1
探索了如何在过滤陶瓷片上制备Silicalite-l和β沸石分子筛复合膜,对它们分离水中微量苯酚和苯的性能进行了考察,并用XRD,SEM和UV等测试方法对其物理化学性能和结构进行了表征,结果表明:Silicalite-l分子筛膜,两者的平均脱除率分别为69.9%和51.5%,通过对Silicalite-l沸石分子筛复合膜进行二次合成及高温水蒸气处理,可在很大程度上改善其了性能。 相似文献
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研究了粒径为15μm和5μm的水热处理Silicalite-Ⅰ填充PDMS膜以及酸处理Silicalite-Ⅰ填充不同品种硅橡胶膜对低浓度乙醇-水混合物的渗透蒸发分离性能的影响。结果表明,沸石粒径的减小,不利于乙醇-水分离系数的提高;不同品种硅橡胶的沸石填充膜对乙醇-水的渗透蒸发分离性能与硅橡胶本身的性质有关。 相似文献
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研究了粒径为15μm和5μm的水热处理Silicalite-I填充PDMS膜以及酸处理Silicalite-I填充不同品种硅像胶膜对低浓度乙醇-水混合物的渗透发分离性能的影响。结果表明,沸石粒径的减小,不利于乙醇-水分离系数的提高;不同品种硅橡胶有沸石充膜对乙醇-水的渗透蒸发分离性能与硅橡胶本身的性质有关。 相似文献
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Fe—Silicalite—2催化剂表面CO2加氢反应性能的研究 总被引:3,自引:0,他引:3
研究了Fe/Silicalite-2催化剂CO2加氢低碳烯烃反应性能,利用CO2-TPD,CO2/H2-TPSR和CO/H2-TPSR表征手段,考察了铁含量及MnO助剂对Fe/Silicalite-2催化剂CO2吸附脱附及加氢反应性能的影响,表明随铁含量增加可提高催化剂对CO2的吸附能力,有利于提高CO2加氢反应的转化率。 相似文献
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荷电膜的膜电位研究进展 总被引:1,自引:0,他引:1
膜电位的测定是表征荷电膜的传递现象的重要参数之一。本文简要介绍了膜电位理论基础,包括T. M. S.理论和不可逆热力学理论。分别阐述了关于离子交换膜、双极膜、两性膜以及复合膜的膜电位的最新进展,并提出今后的发展方向。 相似文献
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Zeolite X membranes were investigated by in-situ hydrothermal synthesis on porous ceramic tubes precoated with zeolite X seeds or precursor amorphous aluminosilicate, and porous α-Al2O3 ceramic tubes with a pore size of 50 200 nm were employed as supports. Zeolite X crystals were synthesized by the classic method and mixed into deionized water as a slurry with a concentration of 0.2 0.5wt%, having a range of crystal sizes from 0.2 to 2μm. Crystal seeds were pressed into the pores near the inner surface of the ceramic tubes, and crystallization took place at 95℃ for 24-96 h. It was also investigated that Boehmite sol added with zeolite X seeds was precoated on ceramic supports to form a layer of γ-Al2O3 by heating, and hydrothermal crystallization could then take place to prepare the zeolite membranes on the composite ceramic tubes. The crystal species were characterized by XRD, and the morphology of the supports subjected to crystallization was characterized by SEM. The composite zeolite membranes have zeolitic top-layers with a thickness of 10-25 μm, and zeolite crystals can be intruded into pores of the supports as deeply as 100μm. The experimental results indicate that the precoating of zeolitic seeds on supports is beneficial to crystallization by shortening the synthesis time and improving the membrane strength. The resulting zeolite X membrane shows permselectivity to tri-n-butylamine((C4H9)3N) over perfluro-tributyl-amine ((C4Fg)3N), and a permeance ratio of 57 for ((C4Hg)3N to (C4F9)3N could be reached at 350℃. Permeances of BZ, EB and TIPB through the zeolite membrane were also measured and were found to slightly increase with temperature. 相似文献
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PREPARATIONOFSILICALITE┐1ANDZSM┐5ZEOLITE/CERAMICCOMPOSITEMEMBRANESZhangLixiong,JiaMengdong,MinEnze(ResearchInstituteofPetrole... 相似文献
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Zhongqiang Xu Qingling Chen Guanzhong LuShanghai Research Institute of Petrochemical Technology Shanghai ChinaInstitute of Industrial Catalysis East China University of Science Technology Shanghai China 《天然气化学杂志》2002,(Z2)
Zeolite X membranes were investigated by in-situ hydrothermal synthesis on porous ceramic tubes precoated with zeolite X seeds or precursor amorphous aluminosilicate, and porous α-Al2O3 ceramic tubes with a pore size of 50-200 nm were employed as supports. Zeolite X crystals were synthesized by the classic method and mixed into deionized water as a slurry with a concentration of 0.2-0.5wt%, having a range of crystal sizes from 0.2 to 2μm. Crystal seeds were pressed into the pores near the inner surface of the ceramic tubes, and crystallization took place at 95℃ for 24-96 h. It was also investigated that Boehmite sol added with zeolite X seeds was precoated on ceramic supports to form a layer of r-Al2O3 by heating, and hydrothermal crystallization could then take place to prepare the zeolite membranes on the composite ceramic tubes. The crystal species were characterized by XRD, and the morphology of the supports subjected to crystallization was characterized by SEM. The composite zeolite membranes hav 相似文献
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A model of the composite membrane consisting of the catalytic layer (CL) and the nanofiltration layer (NFL) is presented. It has been found that applying NFL on the permeate side of CL it is possible to enhance substantially the conversion of substrate into the product. The best performance is obtained for high retention of substrate and low of product. At higher values of volume flow and/or longer catalytic path the retention degree of product becomes negligible. The presence of NFL enhances the influence of distribution of the reaction rate constant, k, on the conversion ratio. Comparing to k = constant the positive effect is obtained if k increases along the catalytic pore, whereas negative—if k decreases. 相似文献