Adsorbent for adsorption of VOCs and preparation method of adsorbent

A technology of adsorbent and template agent, which is applied in the direction of separation methods, chemical instruments and methods, inorganic chemistry, etc., can solve the problem that the adsorption capacity of low-concentration organic waste gas cannot be effectively improved, the pore structure of silica gel material has little effect, and the long-term stability cannot be achieved. Application and other issues, to achieve the effect of good hydrothermal stability, moderate pore size, and high crystallinity

Pending Publication Date: 2019-10-18
淄博齐创新材料科技有限公司 +1
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  • Claims
  • Application Information

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Problems solved by technology

However, this process requires an acidic solution to adjust the pH and a defoamer to eliminate the bubbles generated during the adsorption of VOC gas. The process is more complicated.
[0006] Chinese patent (CN 107128932A) discloses a preparation method of hydrophobic silica for VOC adsorption. During the reaction, the silane coupling agent introduces organic groups with strong affinity for organic molecules, improving the surface hydrophobicity. , but these organic groups have poor thermal stability and cannot be used stably in the adsorption-desorption process for a long time; in addition, the surface grafting of silane coupling agents has little effect on the pore structure of silica gel materials, and cannot effectively improve the efficiency of low-concentration organic waste gas. Adsorption capacity
However, the pretreatment process of this method is cumbersome and complicated, and a large amount of waste acid is produced during the preparation process.
[0008] To sum up, it can be seen that the current VOC adsorbent and its synthesis process generally have problems such as low adsorption capacity of organic waste gas, cumbersome and complicated process, and waste acid generation.

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  • Adsorbent for adsorption of VOCs and preparation method of adsorbent
  • Adsorbent for adsorption of VOCs and preparation method of adsorbent

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preparation example Construction

[0027] As introduced in the background technology, currently VOC adsorbents and their synthesis process generally have problems such as low adsorption capacity of organic waste gas, cumbersome and complicated process, and waste acid generation. In order to solve the above technical problems, in the first part of this disclosure In a typical embodiment, a kind of preparation method of the adsorbent for VOCs adsorption is provided, comprising the following steps:

[0028] (1) Mix the silicon source, aluminum source and template according to the set ratio, and self-pressure crystallize under the set temperature and pressure to generate VOCs adsorbent precursor 1;

[0029] (2) washing the adsorbent precursor 1, ion exchange, and then roasting to obtain the VOCs adsorbent precursor 2;

[0030] (3) Mix the obtained VOCs adsorbent precursor II with alumina, add water and knead, extrude, dry, and roast to obtain the VOCs adsorbent.

[0031] In one or more embodiments of the present d...

Embodiment 1

[0053] A preparation method for an adsorbent for VOCs adsorption, comprising the following steps:

[0054] (1) Silica gel (calculated as silica), sodium metaaluminate (calculated as alumina) and n-butylamine are used according to the set ratio (wherein, the molar ratio of feeding is silica: alumina=600, n-butylamine: Silica = 0.26,) mixed, self-pressure crystallization under the set temperature and pressure, crystallization temperature 165 ° C, crystallization pressure 0.8MPa, crystallization time 36h, to generate VOCs adsorbent precursor 1;

[0055] The VOCs adsorbent precursor that obtains this moment-relative crystallinity 90% (for standard sample, such as figure 1 shown);

[0056] (2) The adsorbent precursor 1 is washed with pure water, ion-exchanged, the exchange liquid is dilute hydrochloric acid, and then roasted, roasting conditions: roasting at 500°C for 8 hours under the condition of ventilation, to obtain the VOCs adsorbent precursor 2;

[0057] At this time, the ...

Embodiment 2

[0061] A preparation method for an adsorbent for VOCs adsorption, comprising the following steps:

[0062] (1) Mix silica sol, sodium metaaluminate and n-butylamine according to the set ratio (the molar ratio of feed is silica: alumina = 650, templating agent: silica = 0.31, ), at the set temperature and pressure Under self-pressure crystallization, the crystallization temperature is 166°C, the crystallization pressure is 0.85MPa, the crystallization time is 30h, and VOCs adsorbent precursor 1 is generated;

[0063] The VOCs adsorbent precursor obtained at this time has a relative crystallinity of 90% (against the standard sample);

[0064] (2) The adsorbent precursor 1 is washed with pure water, ion-exchanged, the exchange liquid is ammonium chloride, and then roasted, roasting conditions: roasting at 550°C for 5 hours under the condition of ventilation, to obtain the VOCs adsorbent precursor 2;

[0065] At this time, the mass percentage of sodium oxide in the product after ...

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Abstract

The invention relates to an adsorbent for adsorption of VOCs and a preparation method of the adsorbent. The preparation method includes the steps that a silicon source, an aluminum source and a template are mixed at a set proportion and self-pressed and crystallized under the set temperature and the set pressure, and a first adsorbent precursor for the VOCs is produced; the first adsorbent precursor for the VOCs is washed, ion-exchanged and then roasted, and a second adsorbent precursor for the VOCs is obtained; and the obtained second adsorbent precursor for the VOCs is mixed with aluminum oxide, the mixture is mixed with water, extruded and dried and roasted, and the adsorption for the VOCs is obtained. The adsorbent for the VOCs synthesized from cheap raw materials has the advantages ofthe good hydrothermal stability, the high crystallinity degree, the large surface area and the moderate pore diameter, and is suitable for adsorption of gas of the VOCs.

Description

technical field [0001] The disclosure relates to an adsorbent for VOCs adsorption and a preparation method. Background technique [0002] The information disclosed in this Background section is only intended to increase the understanding of the general background of the disclosure, and is not necessarily to be taken as an acknowledgment or any form of suggestion that the information constitutes prior art that is already known to those skilled in the art. [0003] Volatile organic compounds (VOCs) refer to organic compounds with a saturated vapor pressure greater than 133.32Pa at normal temperature, a boiling point below 50-260°C at a standard atmospheric pressure of 101.3kPa and an initial boiling point equal to 250°C, or any organic compound that can volatilize at normal temperature and pressure. organic solid or liquid. [0004] A large amount of VOCs emissions will destroy the ozone layer in the atmosphere on the one hand, leading to the generation of photochemical smog....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01D53/02
CPCB01D53/02B01D2257/708B01J20/08B01J20/103Y02A50/20
Inventor 曲令多吉向飞王垚瑶
Owner 淄博齐创新材料科技有限公司
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