Monolithic molecular sieve adsorbent and preparation method and application thereof

A molecular sieve and monolithic technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as low safety, poor adsorption efficiency, and plugging holes, and achieve simple production process, improved adsorption efficiency, and high adsorption efficiency effect

Inactive Publication Date: 2018-04-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art, to provide a monolithic molecular sieve adsorbent and its preparation method, and to apply it to the adsorption of VOCs with a fixed bed adsorption process. Low safety, poor adsorption efficiency, plugging holes and other problems, and can be adapted to the large air volume exhaust gas purification of the actual VOCs industry

Method used

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  • Monolithic molecular sieve adsorbent and preparation method and application thereof
  • Monolithic molecular sieve adsorbent and preparation method and application thereof
  • Monolithic molecular sieve adsorbent and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Choose different types of Y-type molecular sieves, namely HY 1 、HY 2 , high-silicon Y, and ultra-stable Y molecular sieves, compressing and sieving the molecular sieve powders to obtain granular molecular sieves. The various granular molecular sieves obtained were used in the adsorption experiments of benzene series pollutants, and toluene and trimethylbenzene were selected as the representatives of benzene series pollutants to carry out the adsorption experiments respectively.

[0030] The adsorption experiment conditions are as follows: the concentrations of toluene and trimethylbenzene are both 1000ppm, the flow rates are both 100ml / min, and the adsorption is carried out at room temperature. The adsorption results are shown in Table 1.

[0031] Table 1

[0032]

[0033] It can be seen from Table 1 that several Y-type molecular sieves have excellent adsorption capacity for toluene and trimethylbenzene, and their adsorption efficiencies are all above 9%, among wh...

Embodiment 2

[0035] choose HY 1 Molecular sieves are used as adsorbents to prepare monolithic molecular sieve adsorbents. The steps are as follows:

[0036] (1) honeycomb ceramic cordierite (U.S. Corning Company, 400 mesh, 2.5cm 3 ) soaked in deionized water for 24 hours, and dried at 120°C for later use;

[0037] (2) Add high-viscosity zirconium acetate and acetic acid into distilled water, then add HY 1 Molecular sieve powder, use a ball mill to mix each raw material evenly to obtain a coating slurry, and the quality of the high-viscosity zirconium acetate is HY 1 30% of molecular sieve powder quality, the consumption of described acetic acid should make the pH value of coating slurry be 3, the consumption of described distilled water is 45% metering with the solid content of coating slurry;

[0038] (3) Insert one end of the honeycomb cordierite dried in step (1) vertically into the slurry to dip an appropriate amount of coating slurry, and then blow it with an air compressor to even...

Embodiment 3

[0045] The monolithic HY in embodiment 2 1 Molecular sieve adsorbent and activated carbon were applied to the adsorption and purification of various VOCs mixed gases, and their desorption efficiency and regeneration performance were investigated. The simulated gas of various VOCs mixtures comes from the volatile gas of a commercial paint thinner, and its composition is shown in Table 3. The experimental conditions of primary adsorption and secondary adsorption are the same as in Example 2; molecular sieve desorption conditions: blowing air at 200° C. for 3 hours. Activated carbon desorption conditions: blowing air at 120°C for 3 hours. The experimental results are shown in Table 4.

[0046] table 3

[0047]

[0048] Table 4

[0049]

[0050] From the experimental results (Table 4), it can be seen that activated carbon has a strong adsorption performance on VOCs mixed gas, and its primary adsorption efficiency is 16%, but its desorption efficiency is only 10%, and the...

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Abstract

A monolithic molecular sieve adsorbent uses honeycomb cordierite (cordierite honeycomb ceramic) as a matrix and a molecular sieve layer as an adsorption layer. The molecular sieve layer covers the surface of the honeycomb cordierite and is combined with the honeycomb cordierite as one body. The loading amount on a substrate of molecular sieve contained in the molecular sieve layer is 180 to 220 g / L. The pore density of the honeycomb cordierite in the monolithic molecular sieve adsorbent is 300 to 400 meshes. The invention also provides a preparation method of the monolithic molecular sieve adsorbent and application of the monolithic molecular sieve adsorbent in fixed bed adsorption process for adsorption of VOCs. The monolithic molecular sieve adsorbent solves the problems of low safety, poor adsorption efficiency, plugging, and the like in the use of activated carbon adsorption, and can be applied to the purification of large-flow exhaust gas in the actual industry of the VOCs.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve adsorption, and relates to an integral molecular sieve adsorbent, a preparation method and an application in adsorbing volatile organic pollutants. Background technique [0002] Volatile organic pollutants (VOCs) mainly include aliphatic hydrocarbons, aromatic hydrocarbons, alcohols, ethers, aldehydes, ketones, fats, etc. These pollutants come from industries such as petrochemical, spraying, pharmaceutical synthesis, dyes, and rubber industries, and have become serious affect the ecological environment and human health. Benzene pollutants mainly include toluene, benzene, xylene, and trimethylbenzene, which are a type of VOCs and mainly come from painting, coating and other industries. At present, in the purification process of VOCs emissions with low concentration and large air volume, it is often necessary to enrich them with adsorption technology, then desorb the organic matter, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/30B01J20/32B01D53/02
CPCB01D53/02B01D2257/708B01J20/165B01J20/3078B01J20/3204B01J20/3223B01J20/3238Y02A50/20
Inventor 王健礼陈耀强林涛侯忠燕
Owner SICHUAN UNIV
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