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A kind of preparation method of phase stable ammonium nitrate

A technology of ammonium nitrate and phase stabilization, applied in the direction of non-explosive stabilizers, offensive equipment, non-explosive/non-thermal agent components, etc., can solve the problems of toxicity and restricted use, and achieve the effect of inhibiting the phase transition of ammonium nitrate

Active Publication Date: 2018-06-26
内蒙聚力工程爆破有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Claude Merrill et al. used organic matter to effectively inhibit the phase transition of ammonium nitrate IV-III, the toxicity of the materials used limits the use of ammonium nitrate phase transition materials. Therefore, potassium nitrate and copper oxide are still the main ammonium nitrate. phase change inhibitor to use

Method used

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  • A kind of preparation method of phase stable ammonium nitrate
  • A kind of preparation method of phase stable ammonium nitrate
  • A kind of preparation method of phase stable ammonium nitrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dry, grind and grind 98g of ammonium nitrate and dissolve it in 25g of deionized water, then add 2g of potassium formate (PF), heat and stir at 100°C, the mixture is completely dissolved and then naturally cool to room temperature, after recrystallization, filter, and put the filtrate at 60°C Dry for 20 hours to constant weight, grind and sieve (100 mesh) to obtain phase-stable ammonium nitrate. The DSC results of the sample test are shown in Table 1, and the typical test results are shown in figure 1 . Phase stable ammonium nitrate has no phase change in the range of 30°C-100°C.

Embodiment 2

[0020] Dry, grind and grind 99g of ammonium nitrate and dissolve it in 70g of isopropanol, then add 1g of potassium formate (PF), heat and stir at 70°C, the mixture is completely dissolved and cooled to room temperature naturally, after recrystallization, filter, and filter the filtrate at 60°C Dry at ℃ for 24 hours to constant weight, grind and sieve (100 mesh) to obtain phase-stable ammonium nitrate. The DSC results of the sample test are shown in Table 1. Phase stable ammonium nitrate has no phase change in the range of 30°C-100°C.

Embodiment 3

[0022] Dry, grind and pulverize 97g of ammonium nitrate and dissolve it in 50g of deionized water, then add 3g of potassium formate (PF), heat and stir at 80°C, the mixture is completely dissolved and then naturally cool to room temperature, after recrystallization, filter, and put the filtrate at 40°C Dry for 40 hours to constant weight, grind and sieve (300 mesh) to obtain phase-stable ammonium nitrate. The DSC results of the sample test are shown in Table 1. Phase stable ammonium nitrate has no phase change in the range of 30°C-100°C.

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Abstract

The invention discloses a preparing method for phase-stable ammonium nitrate.The preparing method comprises the following steps that dried, ground and smashed ammonium nitrate is dissolved in a solvent; a phase stabilizing additive with the adding amount 1-3% of ammonium nitrate by mass is added, heating, stirring and recrystallizatoin are carried out, drying is carried out after filtering, the mixture is ground and then passes through a screen, and phase-stable ammonium nitrate is obtained, wherein the additive is organic acid sylvine and is selected from potassium formate or potassium acid phthalate or potassium ferricyanide (III) or phthalimide potassium.The preparing method is simple and easy to implement, low in cost, safe in operation and harmless to the human body, and the phase change of ammonium nitrate at 32.1 DEG C (IV-III) and 84 DEG C (III-II) can be inhibited; meanwhile, a small amount of the additive is added, the energy of ammonium nitrate based energy-containing compounds is not influenced, and compared with other ammonium nitrate phase-change materials, phase-stable ammonium nitrate has remarkable advantages.

Description

technical field [0001] The invention relates to a preparation method of ammonium nitrate, in particular to a preparation method of phase-stable ammonium nitrate. Background technique [0002] Ammonium nitrate (AN) is one of the raw materials widely used in chemical fertilizers, industrial explosives, solid propellants and airbags at home and abroad. Under normal pressure conditions, ammonium nitrate has five crystal forms in the temperature range of -20°C to 170°C. As the temperature increases, the crystal form of ammonium nitrate changes into Ⅴ → Ⅳ → Ⅲ → Ⅱ → Ⅰ, corresponding to The temperature change was -18.0°C → 32.1°C → 84.2°C → 125.2°C. Usually, the existence of trace moisture affects the transformation of IV → III, and the crystal form change temperature of ammonium nitrate is raised above 40°C. For industrial production, the phase transitions of IV → III and III → II have important influences. When one crystal form changes to another, the volume of ammonium nitrate ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B23/00C06B31/28
CPCC06B23/006C06B31/28
Inventor 徐志祥
Owner 内蒙聚力工程爆破有限公司
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