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High-silicon composite molecular sieve adsorbent for removing VOCs and preparation method of high-silicon composite molecular sieve adsorbent

A composite molecular sieve and adsorbent technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult to meet VOCs waste gas treatment, poor hydrothermal stability, low hydrophobicity, etc., to improve the utilization of molecular sieves. High efficiency, high hydrophobicity, high utilization effect

Active Publication Date: 2020-07-14
BEIJING LONGTAO ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN102019367A discloses a method for preparing a binder-free ZSM-5 / Y zeolite symbiotic molecular sieve catalyst. The prepared product also has the problem of low hydrophobicity in VOCs exhaust gas treatment
In addition, studies by Shen Baojian (Chem.Lett., 2003, 32(8), 726), Jia Wei (Petrochemical Industry, 2006, 35(9), 832) and others showed that the prepared composite molecular sieve ZSM-5 / Y has the characteristics of low silicon-aluminum ratio and poor hydrothermal stability, which is difficult to meet the needs of VOCs waste gas treatment

Method used

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  • High-silicon composite molecular sieve adsorbent for removing VOCs and preparation method of high-silicon composite molecular sieve adsorbent
  • High-silicon composite molecular sieve adsorbent for removing VOCs and preparation method of high-silicon composite molecular sieve adsorbent
  • High-silicon composite molecular sieve adsorbent for removing VOCs and preparation method of high-silicon composite molecular sieve adsorbent

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preparation example Construction

[0050] The preparation method of the high-silicon composite molecular sieve adsorbent for VOCs removal at least includes the following steps:

[0051] Step 1, the aluminum source Ⅰ, alkali source Ⅰ and H 2 O is mixed and added to the silicon source I, stirred evenly to obtain a mixture, and the obtained mixture is subjected to aging treatment in an ultrasonic state to prepare a Y-type molecular sieve guiding agent.

[0052] Step 2, the H 2 O. Alkaline source II and aluminum source II are mixed, and n-butylamine and silicon source II are added to it to obtain a precursor material, which is subjected to crystallization reaction under microwave condition I to prepare ZSM-5 crystalline suspension Cloudy liquid.

[0053] Step 3. Add Y-type molecular sieve directing agent with a volume fraction of 5%-10% to the ZSM-5 crystallization suspension, as well as aluminum source III and H 2 O, a mixed system is formed after being mixed uniformly; in this mixed system, Na 2 O, Al 2 o 3...

Embodiment 1

[0089] Step 1. Mix sodium aluminate, sodium hydroxide and deionized water at room temperature, and stir evenly. The stirring time is controlled for 1 hour. After the system solution is transparent, the sodium aluminate and sodium hydroxide are completely dissolved, and then It is added to a sodium silicate solution to obtain a mixture; wherein, sodium hydroxide (as Na 2 O), sodium aluminate (as Al 2 o 3 In terms of), sodium silicate solution (as SiO 2 The molar ratio of ) to deionization is 17:1:16:312; the obtained mixture is vigorously stirred for 20 minutes, and then aged at 30°C for 24 hours, and the stirring speed is 100r / min during the aging process. The aging treatment is accompanied by ultrasonic treatment, the ultrasonic power is 200W, the ultrasonic frequency is 40KHz, and the ultrasonic time is 24h, the Y-type molecular sieve guide agent can be prepared.

[0090]Step 2. Mix deionized water, sodium hydroxide and sodium aluminate. After stirring evenly, add templat...

Embodiment 2

[0099] Step 1. Mix aluminum sulfate, sodium hydroxide and deionized water at room temperature, and stir evenly. The stirring time is controlled for 1 hour. When the system solution is transparent, aluminum sulfate and sodium hydroxide are completely dissolved, and then add In sodium silicate solution, obtain mixture; Among them, sodium hydroxide (as Na 2 O), aluminum sulfate (as Al 2 o 3 In terms of), sodium silicate solution (as SiO 2 The molar ratio of ) and deionization is 15:1:16:312; the obtained mixture is vigorously stirred for 20 minutes, and then aged at 60°C for 1 hour, and the stirring speed is 100r / min during the aging process. The aging treatment is accompanied by ultrasonic treatment, the ultrasonic power is 1000W, the ultrasonic frequency is 50KHz, and the ultrasonic time is 1h, the Y-type molecular sieve guide agent can be prepared.

[0100] Step 2. Mix deionized water, sodium hydroxide and sodium aluminate. After stirring evenly, add template agent n-butyla...

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Abstract

The embodiment of the invention discloses a high-silicon composite molecular sieve adsorbent for removing VOCs and a preparation method thereof. The preparation method comprises the following steps: mixing an aluminum source I, an alkali source I and H2O, adding the mixture into a silicon source I, and carrying out ultrasonic aging treatment to obtain a Y-type molecular sieve guiding agent; mixingH2O, an alkali source II and an aluminum source II, adding n-butylamine and a silicon source II, carrying out a crystallization reaction under the microwave condition to obtain ZSM-5 crystallizationturbid liquid; adding a Y-type molecular sieve guiding agent, an aluminum source III and H2O into the ZSM-5 crystallization turbid liquid, adjusting the pH value to 12-12.5, performing hydrothermal crystallization treatment under a microwave condition, performing filtration and water washing after crystallization is completed to obtain a filter cake, and performing pulping treatment on the filtercake to obtain an emulsion; carrying out acid pickling on the emulsion, and then sequentially carrying out filtering, washing, drying and hydrothermal roasting treatment to obtain high-silicon composite molecular sieve powder; stirring the prepared powder with glass fibers, silica sol and H2O at a high speed to obtain mixed slurry, performing vacuum degassing, and performing spray molding to obtain the high-silicon composite molecular sieve adsorbent.

Description

technical field [0001] The invention relates to the technical field of environmental protection, more specifically, the invention relates to a high-silicon composite molecular sieve adsorbent for VOCs removal and a preparation method thereof. Background technique [0002] Exhaust gas containing volatile organic compounds (Volatile Organic Compounds, referred to as VOCs) is one of the main air pollutants at present. It has caused serious harm to the natural environment and human health, and has become a major bottleneck for the sustainable development of related enterprises. Therefore, how to effectively control VOCs has become one of the main topics in the field of environmental protection. Adsorption and catalytic oxidation are effective methods for the terminal treatment of VOCs exhaust gas. [0003] At present, there are many kinds of VOCs adsorbents that have been reported, such as activated carbon, microporous molecular sieves, mesoporous molecular sieves, organic-inor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/28B01D53/04B01D53/06B01J20/30
CPCB01J20/18B01D53/04B01D53/06B01J20/28011B01D2257/708Y02A50/20
Inventor 柴磊昌史东军喻正保吴守力邵建伟徐纪清骆坚平郭行潘涛
Owner BEIJING LONGTAO ENVIRONMENTAL TECH CO LTD
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