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Method for preparing molecular sieve

A molecular sieve and calcination technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of high cost and high energy consumption, and achieve the effects of fast reaction, large adsorption capacity, and developed material pores

Inactive Publication Date: 2013-03-13
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the relevant research uses calcined kaolin as the processing raw material, but calcining often requires high temperature treatment above 550°C, which consumes a lot of energy and costs relatively high

Method used

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  • Method for preparing molecular sieve
  • Method for preparing molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put the kaolin into the microwave oven, adjust the power to 500w, calcinate for 8min, centrifugally wash and dry for later use; add 50g of KOH and 250ml of distilled water into the stainless steel reaction device, put the stainless steel reaction device in an oil bath, stir evenly, and slowly heat to 70°C , and maintained for 30 minutes, then 75g of microwave-calcined kaolin was added to the above solution, mixed and heated, fully stirred, the stirring speed was set at 250r / min, the temperature was controlled at 70°C, and activated for 3h. Cool, centrifuge and wash 3 times, and adjust the pH to 7.5 before the last centrifugation. After the centrifugation is completed, the precipitate is dried, milled, and screened. The obtained white solid powder is the prepared molecular sieve. The obtained molecular sieve was 110 g, and the yield was 88%.

[0020] Adopt the molecular sieve prepared by embodiment 1 to simulate ammonia nitrogen wastewater (100mg L -1 ) treatment, the r...

Embodiment 2

[0022] Put the kaolin into the microwave oven, adjust the power to 600w, calcinate for 6min, centrifugally wash and dry for later use; add 10g of KOH and 50ml of distilled water into the stainless steel reaction device, put the stainless steel reaction device in an oil bath, stir evenly, and slowly heat to 90°C , and maintained for 30 minutes, then 15g of kaolin later in the microwave section was added to the above solution, mixed and heated, fully stirred, the stirring speed was set at 250r / min, the temperature was controlled at 90°C, and activated for 3h. Cool, centrifuge and wash 3 times, and adjust the pH to 7.7 before the last centrifugation. After the centrifugation is completed, the precipitate is dried, milled, and screened. The obtained white solid powder is the prepared molecular sieve. The obtained molecular sieve was 20 g, and the yield was 80%.

[0023] The molecular sieve prepared in embodiment 2 is characterized in detail, by figure 1 As shown in the XRD patter...

Embodiment 3

[0026] Put the kaolin into the microwave oven, adjust the power to 700w, calcinate for 3min, centrifugally wash and dry for later use; add 50g of NaOH and 250ml of distilled water into the stainless steel reaction device, put the stainless steel reaction device in an oil bath, stir evenly, and slowly heat to 150°C , and maintain it for 30 minutes, then add 100g of kaolin later in the microwave section to the above solution, mix and heat, stir well, set the stirring speed at 250r / min, control the temperature at 150°C, and activate for 3h. Cool, centrifuge and wash 3 times, adjust the pH to 8 before the last centrifugation, take the precipitate after centrifugation, dry, grind and screen, and the obtained white solid powder is the prepared molecular sieve. The obtained molecular sieve was 132g, and the yield was 88%.

[0027] Adopt the molecular sieve prepared by embodiment 3 to simulate ammonia nitrogen wastewater (100mg L -1 ) for treatment, the removal rate of ammonia nitrog...

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Abstract

The invention discloses a method for preparing a molecular sieve. The method comprises the following steps: mixing and stirring kaolin which is calcined by microwave, alkaline compound and water, heating to activate at the temperature between 70 and 150 DEG C; centrifugally cleaning for times, and regulating the pH to be between 7.5 and 8 before the last centrifuging; and drying precipitate after the centrifugation is completed, and grinding to obtain the molecular sieve. The preparation method adopts a microwave calcining method to replace the traditional high-temperature calcining method so as to effectively improve the preparation efficiency from time, energy consumption, operation and other aspects, adopts an alkaline activating method to ensure that ratio of silicate to aluminum of the modified kaolin performs effective changes, the active sites are more prominent, and the material pores are more developed; and the novel molecular sieve prepared by adopting the preparation method has the characteristics of high selectivity of ammonium ions, quick response, high adsorption capacity, recycling and the like.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation, in particular to a method for preparing molecular sieves by utilizing kaolin and alkaline substances. Background technique [0002] Kaolin is mainly composed of kaolinite mineral, which is a kind of hydrous layered silicate mineral, and its structure is formed by alternating layers of silicon-oxygen tetrahedron and aluminum-oxygen octahedron. Kaolin has a well-developed pore structure and a large specific surface area. It is a natural mineral material with a wide range of uses. At present, the research, development and application of kaolin are very common. The preparation of molecular sieves is another very important use of kaolin. With the development of industries such as the petroleum industry, the demand for catalysts is gradually increasing, and kaolin as a catalyst carrier and synthetic raw material will surely play an increasingly important role. [0003] Using kaolin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30
Inventor 孙培德宋英琦方瑾马王刚
Owner ZHEJIANG GONGSHANG UNIVERSITY
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