Method for synthesizing molecular screen membrane from in-site aging-microwave heat

A microwave heating and molecular sieve technology, which is applied in the synthesis and application of molecular sieve membranes, can solve problems such as limited applications, and achieve the effects of wide application, high repeatability, and excellent alcohol/water pervaporation performance

Active Publication Date: 2007-09-19
大连海斯特科技有限公司
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  • Application Information

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Problems solved by technology

Chinese patent No. 99112751.X adopts clarified solution to synthesize A-type molecular sieve membrane with the method of microwave heating, but their method needs to pre-coat seed crystals on the carrier (given examples in the patent, in the case of no pre-coated seed crystals , no continuous molecular sieve membrane was synthesized), which limits the application of their method to complex-shaped supports

Method used

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  • Method for synthesizing molecular screen membrane from in-site aging-microwave heat
  • Method for synthesizing molecular screen membrane from in-site aging-microwave heat
  • Method for synthesizing molecular screen membrane from in-site aging-microwave heat

Examples

Experimental program
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Effect test

Embodiment 1A

[0033] The preparation of embodiment 1A type molecular sieve membrane

[0034] The base membrane used in the synthesis of molecular sieve membranes is porous Al 2 o 3 The basement membrane has a pore size of 0.1-0.3um and a porosity of 30%. The basement membrane is sheet-shaped with a diameter of 25mm and a thickness of 2mm. Before use, the base film is smoothed with spun paper, ultrasonically washed in distilled water, and then dried for later use. The dried base film can be directly used for synthesis without pre-coating seed crystals.

[0035] The schematic diagram of the preparation process is shown in Figure 1.

[0036] The synthesis solution for synthesizing molecular sieve membranes is configured as follows:

[0037] Solution (1): Dissolve 100.0 grams of NaOH in 398 ml of deionized water, then add 2.5 grams of metal aluminum foil, and dissolve to obtain solution (1);

[0038] Solution (2): 82.3 grams of NaOH was dissolved in 398ml of deionized water, and then 46.3m...

Embodiment 2

[0041] The preparation of embodiment 2A type molecular sieve membrane

[0042] The same operation as in Example 1 was performed, except that the basement membrane used was tubular, with an inner diameter of 10 mm, an outer diameter of 14 mm, and a length of 40 cm. Both ends of the unseeded membrane tube are blocked with polytetrafluoroethylene plugs (to prevent the inside of the membrane tube from contacting the synthesis solution), and then vertically placed in a polytetrafluoroethylene synthesis kettle to synthesize on the outer surface of the membrane tube. From the scanning electron microscope photos, it can be seen that the surface morphology of the synthesized molecular sieve membrane is similar to that of the molecular sieve membrane synthesized by using the sheet-like basement membrane as a carrier in Example 1 (as shown in FIG. 4 ).

Embodiment 3

[0043] The preparation of embodiment 3A type molecular sieve membrane

[0044] The same operation as in Example 2, except that the outer wall of the film tube without seed crystals is wrapped with a polytetrafluoroethylene tape (to prevent the outer wall of the film tube from contacting the synthetic solution), then vertically placed in the polytetrafluoroethylene synthesis kettle, and the The inner surface of the tube is synthesized. The pervaporation separation performance of the synthesized molecular sieve membrane is close to that of the molecular sieve membrane synthesized outside the tube. This example shows that this method can be conveniently synthesized in the pores of the carrier, so it can be applied to multi-channel carriers and hollow fibers.

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Abstract

Synthesis of molecular sieve membrane from in-situ aging and micro-wave heating is characterized by preparing molecular sieve synthetic liquid with formula aNa2O:Al2O3:bSiO2:cH2O, which is a=20~80, b=3~15, c=500~4000, putting porous base membrane into synthetic liquid, in-situ aging synthetic liquid at 30DEG C~100DEG C for 3~10hrs before microwave heating, synthesizing by microwave heating at 50DEG C~100DEG C for 10~60mins, washing and drying. It has better separating and repeating performances.

Description

Technical field: [0001] The invention relates to the synthesis and application of molecular sieve membranes, and in particular provides a new method for rapidly synthesizing molecular sieve membranes: in-situ aging-microwave heating synthesis. Background technique: [0002] For nearly half a century, with the aggravation of energy shortage and people's increasing awareness of environmental protection, traditional high energy consumption and high pollution industries are in urgent need of large-scale technological reforms. Membrane separation technology is widely used in chemical, Food, medicine, environmental protection, metallurgy and other industrial sectors have been more and more widely used. Zeolite molecular sieve membrane is a new type of inorganic membrane developed in the past ten years. It has the advantages of general inorganic membranes such as high temperature resistance, chemical and biological erosion resistance, high mechanical strength, and large flux. At ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 杨维慎李砚硕刘杰
Owner 大连海斯特科技有限公司
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