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Process for continuously preparing superfine nitroguanidine

A technology of ultra-fine nitroguanidine and preparation process, which is applied in the field of preparation of nitroguanidine, can solve the problems of large crystal particles and cannot be used in the airbag industry, etc., and achieves the effects of stable product quality, reduced labor intensity, and improved operating environment.

Active Publication Date: 2012-10-03
NANTONG TENDENCI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the nitroguanidine produced in China cannot be used in the airbag industry due to the problem of the crystal forming process, either the crystal particles are too large, or the crystals are mainly filamentous and fine needle crystals.

Method used

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  • Process for continuously preparing superfine nitroguanidine
  • Process for continuously preparing superfine nitroguanidine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 100Kg of nitroguanidine into a 1000L stainless steel reaction kettle, add 700L of dissolved water, heat to reflux at 95°C under stirring, and keep warm for 20 minutes; start the filter pump, and transport the dissolved material to the refining kettle through a precision filter; start the cold water pump , pre-cool the water to 5°C, control the flow of cold water to 500L / hr, after stabilization, start the material pump, control the flow of material to 100L / hr, enter the crystallizer, then enter the receiving tank, and obtain ultra-fine nitroguanidine through centrifugal dehydration and drying 55Kg, the measured Fischer particle size is 4.5μm;

Embodiment 2

[0026] Put 100Kg of nitroguanidine into a 1000L stainless steel reaction kettle, add 700L of dissolved water, heat to reflux at 102°C under stirring, and keep warm for 40 minutes; start the filter pump, and transport the dissolved material to the refining kettle through a precision filter; start the cold water pump , pre-cool the water to 0°C, control the flow of cold water to 700L / hr, after stabilization, start the material pump, control the flow of material to 100L / hr, enter the crystallizer, then enter the receiving tank, and obtain ultra-fine nitroguanidine through centrifugal dehydration and drying 50Kg, the measured Fischer particle size is 3.0μm;

Embodiment 3

[0028] Put 100Kg of nitroguanidine into a 1000L stainless steel reaction kettle, add 700L of dissolved water, 2.5Kg of catalyst, heat to reflux at 105°C under stirring, and keep warm for half an hour; start the filter pump, and transport the dissolved material to the refining kettle through a precision filter Start the cold water pump, cool the water to 0°C in advance, control the flow of cold water to 400L / hr, after stabilization, start the material pump, control the flow of material to 100L / hr, enter the crystallizer, then enter the receiving tank, and obtain super 60Kg of fine nitroguanidine, the crystallization is agglomerated structure after determination, and the Fischer particle size is 4.1 μm.

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Abstract

The invention relates to a process for continuously preparing superfine nitroguanidine. The process comprises the following steps of: adding nitroguanidine and deionized water into a dissolving kettle in a ratio of 1:7, heating the nitroguanidine and deionized water to reach a reflux state, and performing refluxing to completely dissolve the nitroguanidine; filtering a nitroguanidine solution to remove mechanical impurities, and adding the filtered solution into a nitroguanidine refining kettle; mixing the refined nitroguanidine and cooling water, controlling the ratio of the nitroguanidine to the water to be 1:4-1:7, adding a mixture into a crystallizer, and thus obtaining the superfine nitroguanidine with the particle size range of 2 to 6 micrometers; and performing centrifugal dewatering, washing, drying, water content and acidity regulating, and packaging on the crystallized superfine nitroguanidine to obtain a finished superfine nitroguanidine product.

Description

technical field [0001] The invention relates to a preparation process of nitroguanidine, in particular to a continuous preparation process of nitroguanidine. Background technique [0002] Nitroguanidine (NQ) CH4N4O2 is a kind of explosive with unique properties. The ultra-fine particle nitroguanidine is a white needle or rod crystal with a crystal density of 1.78g.cm -3 , with a bulk density of 0.1 g.cm -3 or so, under proper conditions, can be pressed out almost as low as 0.1 g.cm -3 NQ compacts with a constrained stable structure, because nitroguanidine can obtain a much lower packing density of stable structures than any other high explosives, so it can produce a lower detonation pressure, in other words, nitroguanidine When the base guanidine is detonated under controlled conditions, it can generate a certain pressure without destructive effect, and this process has a certain degree of continuity. This unique and excellent property makes nitroguanidine widely used as ...

Claims

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Application Information

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IPC IPC(8): C07C279/34C07C277/08
Inventor 谭建平谭祖明黄辉
Owner NANTONG TENDENCI CHEM
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