Dimethyl hydrazine adsorption material in automobile exhaust, and preparation method and application thereof

A technology for automobile exhaust and unsymmetrical dimethyl hydrazine, which is applied in analytical materials, chemical instruments and methods, and other chemical processes, can solve the problems of complex operation, long detection time, low detection limit, etc. Capture efficiency, fast and convenient preparation method, small relative standard deviation effect

Inactive Publication Date: 2019-01-29
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the disadvantages of long detection time, low sensitivity, complicated operation and poor stability in the existing detection and analysis method of unsymmetrical dimethylhydrazine in automobile exhaust, the purpose of the present invention is to provide a kind of adsorption method for unsymmetrical dimethylhydrazine in automobile exhaust. Material, preparation method and application, the material can greatly improve the capture efficiency of unsymmetrical dimethylhydrazine in automobile exhaust, and has the characteristics of wide linear range, low detection limit and small relative standard deviation

Method used

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  • Dimethyl hydrazine adsorption material in automobile exhaust, and preparation method and application thereof
  • Dimethyl hydrazine adsorption material in automobile exhaust, and preparation method and application thereof
  • Dimethyl hydrazine adsorption material in automobile exhaust, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0030] 10 parts of ionic liquid [EPy]NO with a mass fraction of 15% 3 and 60 parts of Na with a mass fraction of 24% 2 SO 4 Mix evenly to obtain a two-phase extraction system, then add 30 parts of TEOA-PAM-Gel with a mass fraction of 47% to obtain a gel-like mixture, burn the above-mentioned gel-like mixture under nitrogen protection for two hours to form powdery particles, Then it was stored in a vacuum oven at 40° C. and left to stand for 48 hours to prepare the ionic liquid active adsorption material.

[0031] The adsorption material is taken out to capture unsymmetrical dimethylhydrazine in automobile exhaust, and the adsorption material of the present invention is used to capture unsymmetrical dimethylhydrazine in automobile exhaust: the volume ratio of automobile exhaust to adsorption material is 2:1, and the adsorption temperature is 27°C. The adsorption time is 10min.

[0032] The permeability of the target before and after capture is recorded in Table 1.

Embodiment 2

[0034] The preparation method of this example is the same as that of Example 1, the only difference is that the type of ionic liquid in the preparation process is different. In this example, the ionic liquid is changed to [bmim][PF6] (1-butyl-3-hexafluorophosphate Methimidazole), and the rest of the conditions were unchanged, and the permeability of the target before and after capture was recorded in Table 1.

Embodiment 3

[0036] The preparation method of this embodiment is the same as that of Example 1, the only difference being that the type of ionic liquid in the preparation process is different, and in this embodiment, the ionic liquid is changed to 1-carboxymethyl-3-methylimidazolium hexafluorophosphate ([ cmmim][PF 6 ]), and the rest of the conditions remain the same, see Table 1 for the permeability of the target before and after capture.

[0037] It can be seen from the above examples and Table 1 that the permeability for separating unsymmetrical dimethylhydrazine in automobile exhaust is respectively 98.9%, 74.3%, and 59.3% by changing the composition of the ionic liquid in the adsorbent material, so [EPy] NO 3 When used as an ionic liquid, it has the largest permeability to unsymmetrical dimethylhydrazine in automobile exhaust, and the best penetration effect.

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Abstract

The invention discloses a dimethyl hydrazine adsorption material in automobile exhaust, and a preparation method and application thereof. The method specifically includes: mixing nitrogen ethylpyridinium nitrate, sodium sulfate and polyacrylamide-triethanolamine graft chelate gel in a mass ratio of 1:7:2, and burning the mixture to obtain an ionic liquid active adsorbent material, wherein the burning temperature is 120-150 DEG C. The method for preparing the adsorbent material has the advantages of rapid and convenient preparation, usage of the special ionic liquid, salt and graft chelate gelin preparation; and the prepared adsorbent material has high targeting property and collection efficiency, and has permeability of dimethyl hydrazine in automobile exhaust reaching 98.9%, wide linearrange, low detection limit and relatively small standard deviation, and can meet the national requirements for detection of dimethyl hydrazine in automobile exhaust.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to an adsorption material for unsymmetrical dimethylhydrazine in automobile tail gas, a preparation method and an application thereof. Background technique [0002] Unsymmetrical dimethylhydrazine is an excellent rocket fuel, widely used in aerospace and national defense fields. At the same time, as a highly toxic compound, there are many strict restrictions on the concentration of unsymmetrical dimethylhydrazine in the environment. However, the current analytical method for trace amounts of unsymmetrical dimethylhydrazine still has the shortcomings of complicated steps and many restrictive conditions. At present, the detection method of unsymmetrical dimethylhydrazine at home and abroad is mainly liquid chromatography tandem mass spectrometry. Liquid chromatography-tandem mass spectrometry is more and more widely used, and it has strong advantages in anti-matri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01J20/28G01N33/00
CPCB01J20/045B01J20/22B01J20/264B01J20/28016G01N33/0047
Inventor 李宇亮郑亚娟马天培徐帅朱棋
Owner CHANGAN UNIV
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