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Method for predicting combustion heat and concentration threshold value of unsymmetrical dimethylhydrazine conversion products

A technology of unsymmetrical dimethyl hydrazine and prediction method, which is applied in the field of energy, can solve problems such as large prediction error, and achieve the effect of simple prediction method

Active Publication Date: 2021-05-07
中国人民解放军火箭军工程大学
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The conversion products of unsymmetrical dimethylhydrazine are mainly some nitrogen-containing organic compounds. At present, the heat of combustion of nitrogen-containing organic compounds can be estimated based on the structural parameters of various functional groups (estimation of standard heat of combustion of nitrogen-containing organic compounds, 2001 "Fire Science and Technology "No. 5), but the prediction error for dimethylamino compounds such as nitrosodimethylamine is relatively large (literature value 22.30kJ / g, predicted value 25.0kJ / g), and the prediction error for formamide is -12%

Method used

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  • Method for predicting combustion heat and concentration threshold value of unsymmetrical dimethylhydrazine conversion products
  • Method for predicting combustion heat and concentration threshold value of unsymmetrical dimethylhydrazine conversion products
  • Method for predicting combustion heat and concentration threshold value of unsymmetrical dimethylhydrazine conversion products

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Prediction of heat of combustion of partial hydrazone, acetaldehyde hydrazone and dimethylaminocarbonitrile, evaluation of the effect of dimethylamino compounds on the heat of combustion of unsymmetrical dimethylhydrazine propellants. The dimethylamino compound conversion products of unsymmetrical dimethylhydrazine include: nitrosodimethylamine, partial hydrazone, acetaldehyde hydrazone, tetramethyltetrazene, dimethylaminoacetonitrile, dimethylaminoformonitrile, etc., of which nitrosodimethylamine Dimethylamine, partial hydrazone, tetramethyltetrazene and acetaldehyde hydrazone are the main conversion products of partial dimethylhydrazine.

[0051] The molecular formula for partial hydrazone is C 3 h 8 N 2 , the calculation of the mole fraction of hydrogen is brought into the formula:

[0052]

[0053] Similarly, the calculated hydrogen mole fractions of acetaldehyde hydrazone and dimethylaminocarbonitrile are 0.625 and 0.583.

[0054] The heat of combustion of u...

Embodiment 2

[0072] Prediction of heat of combustion of trimethylhydrazine, tetramethylhydrazine, and trimethylethylhydrazine, and evaluation of the effects of hydrazine conversions on the heat of combustion of unsymmetrical dimethylhydrazine propellants. Hydrazine conversion products of unsymmetrical dimethylhydrazine include: methylhydrazine, trimethylhydrazine, tetramethylhydrazine, trimethylethylhydrazine, etc.

[0073] The heat of combustion of hydrazine, methylhydrazine, unsymmetrical dimethylhydrazine, and 1,2 dimethylhydrazine can be found in the 2001 edition of "Handbook of Practical Chemistry" published by Science Press. The molecular formula of methylhydrazine is CH 6 N 2 , 3 of the 6 hydrogen atoms are combined with the N atom, and the mole fraction of the hydrogen element is calculated by the following formula:

[0074]

[0075] Also calculate the hydrogen mole fraction of hydrazine, unsymmetrical dimethylhydrazine and 1,2-dimethylhydrazine, and divide the heat of combust...

Embodiment 3

[0086] Prediction of heat of combustion of tetramethylmethanediamine, evaluation of the effect of amine conversion on the heat of combustion of unsymmetrical dimethylhydrazine propellant. Unsymmetrical dimethylhydrazine amine conversion products include: methylamine, dimethylamine, trimethylamine, tert-butylamine, tetramethylmethanediamine, etc., of which dimethylamine has the largest content.

[0087] Tetramethylmethanediamine is the dehydrocoupling product of trimethylamine and dimethylamine. The structural formula of tetramethylmethanediamine is:

[0088]

[0089] The molecular formula of tetramethylmethanediamine is C 5 h 14 N 2 , the calculation of the mole fraction of hydrogen is brought into the formula:

[0090]

[0091] The heat of combustion of methylamine, tert-butylamine, dimethylamine, trimethylamine, triethylamine, and tripropylamine was found in the 2001 edition of "Practical Chemistry Handbook" published by Science Press. Heat of combustion per unit ...

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Abstract

The invention aims to predict the combustion heat of conversion products formed in a storage process of unsymmetrical dimethylhydrazine and evaluate the influence on the combustion performance of the unsymmetrical dimethylhydrazine propellant. The invention finds out a method for establishing a linear model by the molar fraction of the hydrogen element of a nitrogen-containing organic compound and the combustion heat per unit mass of the nitrogen-containing organic compound, and provides a method for calculating the concentration threshold of the compound, so that the determination of the concentration control index of the conversion product in the storage process of unsymmetrical dimethylhydrazine is facilitated. The prediction of the combustion heat of a dimethylamino compound, a hydrazine compound, an amine compound and an amide compound can be realized, the combustion heat prediction method is simple and visual, the correlation coefficient of the prediction model is high, and the correlation coefficient is 0.99 or above. According to the embodiment, the influence of substances such as unsymmetrical hydrazone, nitrosodimethylamine, dimethylamine, tetramethyltetrazene, acetaldehyde hydrazone and dimethylformamide on the combustion heat of the unsymmetrical dimethylhydrazine propellant is evaluated.

Description

technical field [0001] The invention belongs to the field of energy, and relates to a method for predicting combustion heat and concentration threshold of unsymmetrical dimethylhydrazine conversion products, in particular to dimethylamino compounds, hydrazine compounds, amine compounds and amide compounds in unsymmetrical dimethylhydrazine conversion products Prediction methods for heat of combustion per unit mass and concentration thresholds. Background technique [0002] During long-term storage, unsymmetrical dimethylhydrazine will undergo oxidation, decomposition, and water absorption to produce a series of transformation products, resulting in the decrease of specific impulse and ignition delay of unsymmetrical dimethylhydrazine. The test run has proved that 1% partial hydrazone reduces the specific thrust by 0.19s, and water, as a fully oxidized conversion product, can no longer provide combustion heat. When the water content of the propellant increases by 0.1%, the sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C20/10C06D5/00
CPCG16C20/10C06D5/00
Inventor 王煊军刘祥萱慕晓刚王焕春
Owner 中国人民解放军火箭军工程大学
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