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Method for efficiently reducing granularity of 5A molecular sieve (MS)

A molecular sieve and particle size technology, applied in the field of molecular sieve, can solve the problem that MS nitrogen production technology cannot exert higher economic benefits, and achieve the effect of speeding up the adsorption speed, shortening the adsorption period and increasing the output.

Active Publication Date: 2014-07-02
天津众智科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the limitations of the preparation method of 5A molecular sieves, the particle size of 5A molecular sieves currently produced in industry is 5 microns, and it is difficult to economically and efficiently synthesize 5A molecular sieves with smaller particle sizes in the existing technology, which leads to the inability of MS nitrogen generation technology to exert a higher performance. economic benefits

Method used

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  • Method for efficiently reducing granularity of 5A molecular sieve (MS)
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  • Method for efficiently reducing granularity of 5A molecular sieve (MS)

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Embodiment 1

[0033] A method for efficiently reducing the particle size of 5A molecular sieves, the steps are as follows:

[0034] ⑴The 5A molecular sieve purchased from Huiying Chemical Industry (Quanzhou) Co., Ltd. has an average particle size of 5.0μm and a total specific surface area of ​​640.6m 2 / g, the micropore specific surface area is 555.7m 2 / g.

[0035] (2) Add 55g of absolute ethanol to 291g5A molecular sieve, the addition amount is 25%, mix well,

[0036] (3) Disperse in 209g of distilled water, with a solid content of 43%, and stir evenly;

[0037] (4) The particle size of the grinding medium is 1mm;

[0038] (5) Perform shearing treatment for 15 minutes at a speed of 3600 rpm.

[0039] (6) Then use the Mini Motormill250 produced by Eiger Machinery Inc. to mark it as 5A-5 after treatment, measure the molecular sieve particle size, total specific surface area and micropore specific surface area, and calculate the relative adsorption speed. The data are as follows;

[004...

Embodiment 2

[0044] A method for efficiently reducing the particle size of 5A molecular sieves, the steps are as follows:

[0045] ⑴The 5A molecular sieve purchased from Huiying Chemical Industry (Quanzhou) Co., Ltd. has an average particle size of 5.0μm and a total specific surface area of ​​640.6m 2 / g, the micropore specific surface area is 555.7m 2 / g.

[0046] (2) Add 55g of absolute ethanol to 291g5A molecular sieve, the addition amount is 25%, mix well,

[0047] (3) Disperse in 209g of distilled water, with a solid content of 43%, and stir evenly;

[0048] (4) The particle size of the grinding medium is 1mm;

[0049] (5) Perform shearing treatment for 30 minutes at a speed of 3600 rpm.

[0050] (6) Then use the Mini Motormill250 produced by Eiger Machinery Inc. to mark it as 5A-5 after treatment, measure the molecular sieve particle size, total specific surface area and micropore specific surface area, and calculate the relative adsorption speed. The data are as follows;

[005...

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PUM

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Abstract

The invention relates to a method for efficiently reducing granularity of a 5A molecular sieve (MS). The method comprises the following steps of: (1) adding a duct proppant to the 5A MS; (2) dispersing the 5A MS in a dispersing agent to prepare an MS suspension; (3) selecting a grinding medium; (4) setting grinder parameters; and (5) adding the MS suspension and the grinding medium to a grinder to be ground. The method has the advantages that under the condition of keeping the adsorption quantity of the 5A MS changeless, the granularity of the MS is reduced, the adsorption cycle of the 5A MS for producing nitrogen through pressure swing adsorption (PSA) is shortened, the yield of high purity nitrogen is obviously increased, and the economic benefits of nitrogen production through PSA of the MS are increased.

Description

technical field [0001] The invention belongs to the field of molecular sieves and relates to a method for efficiently reducing the particle size of 5A molecular sieves. Background technique [0002] Pressure swing adsorption PSA nitrogen production method is to use the preferential adsorption performance of solid adsorbent for oxygen or nitrogen to separate the oxygen in the air, and at the same time enrich the nitrogen in the air to a concentration greater than 99.5%. At present, commonly used solid adsorbents include carbon molecular sieves and 5A molecular sieves. Carbon molecular sieve (CMS) nitrogen production is based on the difference in the diffusion rate of oxygen and nitrogen, enriches nitrogen in the gas phase, and the enriched nitrogen can be taken out directly from the outlet of the adsorber. The purity of nitrogen produced by CMS is only 99.5%; while 5A molecular sieve (MS ) Nitrogen production is based on the difference in the amount of oxygen and nitrogen ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30B01J20/28B01D53/047
Inventor 常云峰张福丽
Owner 天津众智科技有限公司
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