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Supercritical fluid technology coating modifying technique of ammonium nitrate

A technology of supercritical fluid and ammonium nitrate, which is applied in the production of bulk chemicals, fertilizer mixtures, explosives, etc., and can solve problems such as ultrafine ammonium nitrate coating

Inactive Publication Date: 2009-11-25
NORTH BLASTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of ultrafine ammonium nitrate coating in the prior art, the present invention provides a supercritical fluid technology coating modification process for ammonium nitrate

Method used

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  • Supercritical fluid technology coating modifying technique of ammonium nitrate
  • Supercritical fluid technology coating modifying technique of ammonium nitrate
  • Supercritical fluid technology coating modifying technique of ammonium nitrate

Examples

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Embodiment 1

[0014] Example 1, a supercritical fluid technology coating modification process of ammonium nitrate, mixing a certain amount of AN with acetone (mass ratio 1:0.8) for closed grinding, after 10 minutes, the particle size of AN is 2-10 μm.

[0015] The coating process adopts a supercritical fluid anti-solvent process and utilizes a supercritical extraction device. The process is divided into: expansion of coating solution, extraction of solvent, deposition of coating on AN surface, solvent and CO 2 The separation of ammonium nitrate and the acetone nitrocellulose solution that grinds well and 10% mass fraction are made suspension (the mass ratio of ammonium nitrate and nitrocellulose is 99: 1), be placed in high-pressure deposition tank; Then pass into As an anti-solvent, carbon dioxide quickly dissolves with acetone, causing the solute nitrocellulose dissolved in it to produce a certain degree of supersaturation. After constant temperature and constant pressure extraction, the ...

Embodiment 2

[0017] Example 2, a supercritical fluid technology coating modification process for ammonium nitrate, mixing ammonium nitrate with acetone and grinding by mechanical grinding to make the particle size of ammonium nitrate 2-10 μm, and mixing the ground ammonium nitrate with 10% The acetone nitrocellulose solution is made into a suspension (the mass ratio of ammonium nitrate to nitrocellulose is 97:1), and placed in a high-pressure deposition kettle; then carbon dioxide is introduced as an anti-solvent, and it is rapidly miscible with acetone, causing the solute dissolved therein to be nitrated Cotton produces a certain degree of supersaturation, and the acetone is taken away by constant temperature and constant pressure extraction. The nitrocellulose is recrystallized and precipitated on the surface of ammonium nitrate particles, and finally particles with a particle size of 2-15 μm are obtained. The autoclave extraction temperature is 32 ° C, constant pressure The extraction pr...

Embodiment 3

[0018] Embodiment 3, a supercritical fluid technology coating modification process of ammonium nitrate, ammonium nitrate is mixed with acetone and ground by mechanical grinding method so that the particle size of ammonium nitrate is 2-10 μm, and the ground ammonium nitrate is mixed with 10% The acetone nitrocellulose solution is made into a suspension (the mass ratio of ammonium nitrate to nitrocellulose is 100:1), and placed in a high-pressure deposition kettle; then carbon dioxide is introduced as an anti-solvent, and it is rapidly miscible with acetone, causing the solute dissolved therein to be nitrated Cotton produces a certain degree of supersaturation, acetone is taken away by constant temperature and constant pressure extraction, nitrocellulose is recrystallized and precipitated on the surface of ammonium nitrate particles, and finally particles with a particle size of 2-15 μm are obtained. The autoclave extraction temperature is 30 ° C, constant pressure The extraction...

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Abstract

The present invention relates to a supercritical fluid technology coating modifying technique of ammonium nitrate, and particularly to a supercritical fluid technology coating modifying technique of ammonium nitrate. The invention settles the problem of superfine ammonium nitrate coating existing in the prior art. The method is that the ammonium nitrate and the acetone are mixed and grinded so that the grain diameter of the ammonium nitrate is 2-10 mu m. The grinded ammonium nitrate and 10% of acetone nitrocellulose solution are prepared to a suspension and placed into a high-pressure deposition deposition kettle. Then the carbon diode is introduced as an antisolven for inter-dissolving with the acetone. The nitrocotton recrystallizes, separates out and precipitates on the surface of ammonium nitrate particle. Finally the particle with the grain diameter of 2-15 mu m is obtained. The extraction temperature of the high-pressure kettle is 30-32 DEG C. The constant-pressure extraction pressure is 9-11 Mpa. The product prepared by the technique of the invention has the advantages of no conglobation, no agglomeration, and remarkably reduced hygroscopicity.

Description

technical field [0001] The invention relates to a supercritical fluid technology coating application technology, in particular to a supercritical fluid technology coating modification process of ammonium nitrate. Background technique [0002] Ammonium nitrate (AN) is one of the most widely used chemical fertilizers, and it is also the most important main component of industrial explosives. In the defense industry, ammonium nitrate is an excellent oxidant for propellants. It is widely used and has a huge demand. AN is used in propellants and has the advantages of low characteristic signal, low price and safe use. Because ultra-fine AN is more conducive to the thorough mixing with other components and improves the contact probability with other components, it can significantly improve the combustion and explosion characteristics and improve the action efficiency. Ultrafine AN will be widely used in civil emulsion explosives, microemulsion explosives and military propellants i...

Claims

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Application Information

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IPC IPC(8): C06B31/28C05G3/08C05G3/90
CPCY02P20/54
Inventor 柴涛杨晓汾王建华袁俊明常双君
Owner NORTH BLASTING TECH
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