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A method for on-line monitoring of product particle size distribution in crystallization liquid during the preparation of rdx

A particle size distribution and particle size technology, applied in particle size analysis, particle and sedimentation analysis, measuring devices, etc., can solve problems such as online analysis of product particle size distribution, and achieve fast analysis speed, simple operation, and green process.

Active Publication Date: 2019-11-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of on-line analysis of product particle size distribution in the crystallization liquid in the existing RDX preparation process, and to establish a method for online measurement of the particle size distribution of RDX in the crystallization liquid by online particle size analysis technology

Method used

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  • A method for on-line monitoring of product particle size distribution in crystallization liquid during the preparation of rdx
  • A method for on-line monitoring of product particle size distribution in crystallization liquid during the preparation of rdx
  • A method for on-line monitoring of product particle size distribution in crystallization liquid during the preparation of rdx

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Experimental program
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Effect test

Embodiment 1

[0043] Step 1. The attenuation signal value of RDX is collected by the ultrasonic online monitoring method in the crystallization part of the direct method RDX preparation process, and the particle size parameter is kept constant, and the particle size value and particle size distribution are obtained by the offline collection method. Collect the attenuation signal value of RDX; adjust the temperature, nitric acid content and solid content at will, and continue to collect the attenuation signal value of RDX; then change the particle size parameter, repeat the above steps, and finally get the corresponding particle size value and particle size distribution. Attenuated signal values ​​for multiple RDXs;

[0044] The variables are RDX product particle size, temperature, nitric acid content and solids content. The scopes of the variables are:

[0045] Temperature range: 40-70°C,

[0046] Variation range of nitric acid content: 40-60%,

[0047] RDX product particle size change r...

Embodiment 2

[0073] In the process of preparing RDX by the direct method, there are processes such as nitrification, maturation, oxidation crystallization, filtration, drying, and packaging. Among them, 1-4 oxidation crystallizers can be set up according to requirements, and the online particle size monitoring instrument can be set in the second crystallization Process, through online monitoring of changes in particle size and particle size distribution, the process can be fed back, process parameters adjusted, and RDX products that meet demand can be prepared.

[0074] According to the established online particle size monitoring model, the probe is used to collect the attenuation signal of RDX during the crystallization process, and the particle size distribution and D 10 、D 50 、D 90 Value, and at the same time in the crystallization solution on-site sampling for off-line analysis, the test results were compared, see Table 2.

[0075] Table 2 shows the comparison and error between the o...

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Abstract

The invention relates to an on-line monitoring method for product particle size distribution in crystalline liquid in an RDX (Hexogeon) preparation process, and belongs to the explosive technology integration technology and the technical field of online particle size analysis. The method adopts an online particle size analyzer, a computer and signal collection software to quickly measure RDX particle size distribution in the crystalline liquid, a nitric acid content range in a system is 40-60%, solid contents are 0-50%, temperature is 40-70DEG C, and the particle size of the RDX product is eight categories of particle size levels. The method is high in analysis speed, and generally finishes RDX product particle size distribution analysis in the crystalline liquid in one minute. In an analysis process, no samples need to be taken from a reaction kettle, and the sample does not need to be pretreated. The method has the advantages of being high in analysis efficiency, simple in operation,efficient, accurate, low in cost and environmentally-friendly in processes, and the process is free from pollution since no toxic and harmful reagent is used.

Description

technical field [0001] The invention relates to an analysis method for on-line rapid determination of particle size distribution of products in crystallization liquid during the preparation of RDX (RDX), and belongs to the technical fields of explosive process integration technology and on-line particle size analysis. Background technique [0002] The particle size distribution has a great influence on the performance of RDX products, such as thermal decomposition characteristics, safety, mechanical sensitivity, impact sensitivity, spark sensitivity, electrostatic sensitivity, combustion performance, mechanical properties, and linear expansion coefficient of the powder column. International RDX products are divided into two categories and eight levels. [0003] The RDX products prepared by the direct method are generally analyzed by off-line particle size analysis to confirm the particle size D of the RDX products. 50 And particle size distribution, if the particle size dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02
CPCG01N15/02
Inventor 李丽洁金韶华陈树森周述文许建新曹建国张路遥董晓燕
Owner BEIJING INSTITUTE OF TECHNOLOGYGY