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Preparation of inner-side tubular zeolite NaA membranes in a continuous flow system

机译:连续流动系统中内侧管状NaA沸石膜的制备

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Zeolite NaA membranes were synthesized on the inner side of porous titania(rutile)asymmetric tubular supports in a flow system where the synthesis gel was circulated through the support with flow rates in the range 1.5-4 mL min~(-1)by the action of gravity.The syntheses were carried out hydrothermally at 358 K for 6-7h either with or without previous brush-seeding of the supports.The membranes(10-20 mu m in thickness)showed great ability to dehydrate ethanol/water mixtures(92:8,w/w)by pervaporation with selectivities and fluxes,respectively,up to 8500 and 1.2 kg m~(-2)h~(-1)at 323 K.The role of intercrystalline defects in the pervaporation performance of the synthesized membranes was also investigated.
机译:在流动系统中在多孔二氧化钛(金红石)不对称管状支撑物的内侧合成沸石NaA膜,其中合成凝胶通过该作用在流速为1.5-4 mL min〜(-1)的范围内循环通过支撑物合成过程在358 K水热下进行6-7h(有或没有预先刷涂载体)。膜(厚度为10-20μm)显示出强大的脱水乙醇/水混合物的能力(92选择性和通量的全蒸发分别在8500和1.2 kg m〜(-2)h〜(-1)的条件下达到8:w / w)。晶间缺陷在合成材料的全蒸发性能中的作用膜也进行了研究。

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