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

A technology of molecular sieve and particle size, which is applied in the field of molecular sieves, can solve the problems that MS nitrogen production technology cannot exert higher economic benefits, and achieve the effects of accelerating adsorption speed, shortening adsorption cycle, and increasing production

Inactive Publication Date: 2013-04-03
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 limitation of the preparation method of 5A molecular sieve, the particle size of the existing 5A molecular sieve is 5 microns, and it is difficult to economically and efficiently synthesize 5A molecular sieve with a smaller particle size by the existing technology, which leads to the inability of MS nitrogen production technology to exert a higher economic efficiency. benefit

Method used

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

Examples

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Effect test

Embodiment 1

[0029] A method for reducing the granularity of 5A molecular sieves, the steps are as follows:

[0030] 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;

[0031] (2) Disperse 272g of 5A molecular sieve into 228g of distilled water with a solid content of 42%, and stir evenly;

[0032] (3) The particle size of the grinding medium is 1mm;

[0033] ⑷Set the parameters of the grinding machine: the number of revolutions is 3000 rpm, and the time is 2 minutes;

[0034] (5) In this example, Mini Motormill 250 produced by Eiger Machinery Inc. was used, which was marked as 5A-1 after treatment, and the molecular sieve particle size, total specific surface area and micropore specific surface area were measured, and the relative adsorption speed was calculated. The data are as follows;

[0035] Table 1 Basic...

Embodiment 2

[0039] A method for reducing the granularity of 5A molecular sieves, the steps are as follows:

[0040] (1) The 5A molecular sieve was purchased from the industrial supplier Huiying Chemical Industry (Quanzhou) Co., Ltd. The particle size of the molecular sieve is 5.0μm, and the total specific surface area is 640.6m 2 / g, the micropore specific surface area is 555.7m 2 / g;

[0041] (2) Disperse 291g of 5A molecular sieve into 209g of distilled water with a solid content of 45%, and stir evenly;

[0042] (3) The particle size of the grinding medium is 1mm;

[0043] (4) Set the parameters of the grinding machine: perform shearing treatment for 2 minutes at a speed of 3600 rpm;

[0044] (5) Then use the Mini Motormill250 produced by Eiger Machinery Inc. to treat and label it as 5A-2, 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;

[0045] Table 2 ...

Embodiment 3

[0049] A method for reducing the granularity of 5A molecular sieves, the steps are as follows:

[0050] 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.

[0051] (2) Disperse 364g of 5A molecular sieve into 261g of distilled water with a solid content of 45%, and stir evenly;

[0052] (3) The particle size of the grinding medium is 1mm;

[0053] (4) Set the parameters of the grinding machine: perform shearing treatment for 30 minutes at a speed of 3600 rpm;

[0054] (5) Then use the Mini Motormill250 produced by Eiger Machinery Inc. to treat and label it as 5A-3, 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;

[0055] Table 3 Basic properties of 5A-3 molecular sieves ...

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Abstract

The invention relates to a method for reducing granularity of a 5A molecular sieve (MS). The method comprises the following steps of: dispersing the 5A MS in a dispersing agent to prepare an MS suspension; selecting a grinding medium; setting grinder parameters; and 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 reducing the granularity 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 adsorption. Nitr...

Claims

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Application Information

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Patent Type & Authority Applications(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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