Pervaporation of ketone/water mixtures through silicalite membrane
Pervaporation of ketone/water mixtures through silicalite membrane
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DOI：
10.1016/j.desal.2007.09.096
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发表时间：
2008-12-31
期刊：
影响因子：
9.9
通讯作者：
Kita, Hidetoshi
中科院分区：
文献类型：
--
作者：
Chen, Xiangshu;Lin, Xiao;Kita, Hidetoshi
以正硅酸乙酯(TEOS)和四丙基氢氧化铵(TPAOH)为硅源，有机结构导向剂为有机导向剂，在多孔莫来石载体外表面原位晶化制备了硅沸石薄膜。从扫描电子显微镜观察可知，多孔载体的外表面完全覆盖着无规则取向、相互生长的硅石晶体，致密的中间层厚度估计为5-10微米。研究了有机/水混合物在硅沸石膜上的渗透汽化过程。有机硅沸石膜对有机/水混合物具有较高的有机选择性。例如，在185℃水热处理40h的条件下，以1wt.%丙酮和5wt.%MEK为原料，在30℃下分别获得了最高的丙酮/水和甲乙酮/水分离系数934和32,000，通量分别为0.20和0.25 kg m(-2)h。正丁烷/异丁烷的理想分离系数在200℃、压差为101kPa时为73，表明在此合成条件下制备的硅沸石膜缺陷较少。
Silicalite membranes were prepared by in situ crystallization on the Outer surface of porous tubular mullite supports with tetraethoxysilane (TEOS) and tetrapropylammonium hydroxide (TPAOH) as silica source and organic structure directing agent, respectively. The outer-surface of the porous support was completely covered with randomly oriented, intergrown silicalite crystals and the thickness of the dense intermediate layer was estimated about 5-10 mu m, judging from the scanning electron microscopy observation. Pervaporation of organic/water mixtures through silicalite membranes was investigated. The silicalite membranes showed high organic selectivity from organic/water mixtures. For example, the highest acetone/water and methyl ethyl ketone (MEK) /water separation factors of 934 and 32,000 with fluxes of 0.20 and 0.25 kg m(-2) h for a feed of 1 wt.% acetone and 5 wt.% MEK at 30 degrees C, respectively, were obtained for the silicalite membrane prepared at 185 degrees C for 40 h of hydrothermal treatment. An n-butane/i-butane ideal separation factor of 73 at 200 degrees C and at pressure difference of 101 kPa also indicated that the silicalite membrane prepared under such synthesis conditions had fewer defects.