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Method for preparing zeolite membrane through thermal inversion of xerogel

A zeolite membrane and xerogel technology, applied in the field of chemical engineering, can solve problems such as reduction, and achieve the effects of reducing pollution, improving the uneven thickness of the membrane layer, and saving the preparation cost

Inactive Publication Date: 2006-07-19
DALIAN UNIV OF TECH
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Problems solved by technology

At the same time, the treatment liquid separated after hydrothermal treatment can be reused after filtration, which not only reduces the cost but also is beneficial to environmental protection; and because the thickness and uniformity can be artificially controlled in the preparation of the gel layer, the final zeolite membrane can be uniform and dense , so as to effectively improve the unavoidable uneven thickness of the film layer and the generation of more zeolite membrane defects in the complete in-situ hydrothermal synthesis; it is also convenient to prepare large-area carrier-supported zeolite membranes, which is conducive to the further industrial application of zeolite membranes

Method used

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Examples

Experimental program
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Embodiment

[0014] Preparation of sol and hydrothermal treatment solution:

[0015] In a 250ml beaker, 1.48g of aluminum sulfate was fully dissolved in 30ml of water to obtain solution (a), and another 11.4ml of silica sol (SiO 2 wt% = 25.5%) was diluted with 30ml of water, slowly added to (a) solution under strong stirring, and continued stirring for 30 minutes to form (b) solution, and then 1.12g of sodium hydroxide was dissolved in 30ml of water Make a solution, slowly drop into (b) under continuous stirring, and continue stirring for 3 hours to make a white milky sol (c); in another 250ml beaker, dissolve 1.12g of sodium hydroxide in 60ml of water, and add 4.25g of pyrrolidine and mix well to make hydrothermal treatment solution (d).

[0016] Vector preprocessing:

[0017] Polish the surface of the support carrier with 600# sandpaper, then use ultrasonic vibration to wash away the suspended particles on the surface and pores, then soak in acid or alkali for 24 hours, ultrasonically ...

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Abstract

The invention relates to a kind of zeolite film prepn, method. The characteristics are: to compound sol according to mole matching ratio of Na2O:SiO2:Al2O3:H2O, to coat sol layer on supporting body of a-Al2O3 ceramics etc., it is conversed to dry sol layer, then is put into stainless steel pressure pot with polytetrafluorine lining to be soaked by water heat treatment solution compounded at same time, the pot is closed in temp, 80-200 deg.C, keeping the temp, for 24-48 hours, then taking out, washing, drying and inreasing and reducing temp, in program to obtain zeolite film.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and relates to a preparation method of an inorganic membrane, in particular to a preparation method of a xerogel hydrothermal conversion zeolite membrane. technical background [0002] The zeolite membrane uses porous material as a carrier to synthesize zeolite to form a uniform zeolite film on its surface. It has the incomparable advantages of organic membranes such as good chemical and thermal stability, as well as the characteristics of small and uniform pore size and adjustable cations, which have attracted widespread attention and developed rapidly in recent years. The use of such membrane materials for gas separation or catalytic reactions has shown excellent performance. However, because the preparation of zeolite membrane still has high requirements for raw materials, the preparation cost is high, and the existing preparation method is difficult to avoid the uneven thickness ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 王金渠祝刚鲁金明鲍仲瑛
Owner DALIAN UNIV OF TECH
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