A Dumas azotometer reaction tube

A nitrogen analyzer and reaction tube technology, used in the detection of total nitrogen content in urea, can solve problems such as damage, no solution, strong corrosiveness, etc., to ensure reliability, eliminate adverse interference, and reduce effects.

Active Publication Date: 2022-03-04
北京诺德泰科仪器仪表有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfur dioxide is highly corrosive as an acidic gas. If it passes through these components for a long time, it will definitely cause a large degree of damage
There is no solution for this problem in the prior art

Method used

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  • A Dumas azotometer reaction tube
  • A Dumas azotometer reaction tube
  • A Dumas azotometer reaction tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The primary combustion tube is filled sequentially from bottom to top:

[0075] (1-1) spacer ring;

[0076] (1-2) metal mesh;

[0077] (1-3) Corundum balls with a height of 10mm;

[0078] (1-4) a mixture of 80g copper oxide and 30g corundum balls;

[0079] (1-5) Corundum balls with a height of 10mm;

[0080] (1-6) Ash tube.

[0081] The secondary combustion tube is filled sequentially from bottom to top:

[0082] (2-1) spacer ring;

[0083] (2-2) metal mesh;

[0084] (2-3) Lead chromate with a height of 50mm;

[0085] (2-4) the mixture of 170g copper oxide and 15g platinum catalyst;

[0086] (2-5) Lead chromate with a height of 40mm;

[0087] (2-6) Silver wires with a height of 20 mm.

[0088] The reduction tube is filled sequentially from bottom to top:

[0089] (3-1) Quartz wool with a height of 10mm;

[0090] (3-2) Lead chromate with a height of 50mm;

[0091] (3-3) Tungsten group, including 9 spacer nets, 8 layers of tungsten particles, each layer of tu...

Embodiment 2

[0096] The primary combustion tube is filled sequentially from bottom to top:

[0097] (1-1) spacer ring;

[0098] (1-2) metal mesh;

[0099] (1-3) Corundum balls with a height of 10mm;

[0100] (1-4) a mixture of 80g copper oxide and 30g corundum balls;

[0101] (1-5) Corundum balls with a height of 10mm;

[0102] (1-6) Ash tube.

[0103] The secondary combustion tube is filled sequentially from bottom to top:

[0104] (2-1) spacer ring;

[0105] (2-2) metal mesh;

[0106] (2-3) Lead chromate with a height of 45 mm;

[0107] (2-4) the mixture of 100g copper oxide and 5g platinum catalyst;

[0108] (2-5) Lead chromate with a height of 35mm;

[0109] (2-6) Silver wires with a height of 15mm.

[0110] The reduction tube is filled sequentially from bottom to top:

[0111] (3-1) Quartz wool with a height of 5mm;

[0112] (3-2) Lead chromate with a height of 45mm;

[0113] (3-3) Tungsten group, including 6 spacer nets, 5 layers of tungsten particles, each layer of tung...

Embodiment 3

[0118] The primary combustion tube is filled sequentially from bottom to top:

[0119] (1-1) spacer ring;

[0120] (1-2) metal mesh;

[0121] (1-3) Corundum balls with a height of 10mm;

[0122] (1-4) a mixture of 80g copper oxide and 30g corundum balls;

[0123] (1-5) Corundum balls with a height of 10mm;

[0124] (1-6) Ash tube.

[0125] The secondary combustion tube is filled sequentially from bottom to top:

[0126] (2-1) spacer ring;

[0127] (2-2) metal mesh;

[0128] (2-3) Lead chromate with a height of 55 mm;

[0129] (2-4) the mixture of 200g copper oxide and 50g platinum catalyst;

[0130] (2-5) Lead chromate with a height of 45mm;

[0131] (2-6) Silver wires with a height of 25 mm.

[0132] The reduction tube is filled sequentially from bottom to top:

[0133] (3-1) Quartz wool with a height of 15mm;

[0134] (3-2) Lead chromate with a height of 55mm;

[0135] (3-3) Tungsten group, including 12 spacer nets, 11 layers of tungsten grains, 20g of tungsten ...

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Abstract

The invention discloses a reaction tube of a Dumas nitrogen analyzer, which comprises a primary combustion tube, a secondary combustion tube and a reduction tube. In the invention, the filling method of the traditional primary combustion tube remains unchanged, and the technical scheme of replacing the corundum ball and part of copper oxide in the secondary combustion tube with lead chromate, and the corundum ball at the lower part of the reduction tube with lead chromate, not only It retains the advantage of two-stage combustion and is filled with lead chromate that adsorbs sulfur. The Dumas nitrogen analyzer reaction tube has a stable baseline when analyzing samples with high sulfur content, regardless of the size of the injection. The parallelism of the results is good.

Description

technical field [0001] The invention relates to a Dumas azotometer reaction tube and relates to the field of detection of urea total nitrogen content. Background technique [0002] Protein is the first of the six nutrients for the survival of humans and animals. Nitrogen is the main component of proteins and enzymes in organisms and the basis of life. The principle of the Dumas Nitrogen Analyzer is to convert the nitrogen in the sample into nitrogen gas through high-temperature combustion and reduction, detect the total nitrogen content through a thermal conductivity detector, and then further calculate the protein content or urea content through the nitrogen content. A large number of scientific experiments have proved that the analysis results of the Dumas nitrogen method and the Kjeldahl method have very good consistency, and have been adopted by many international and national standards. [0003] Diesel engine exhaust treatment fluid is generally called urea for vehicle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/24
CPCG01N25/24
Inventor 李晓刚郭智成尚东红张广勇李耕伟
Owner 北京诺德泰科仪器仪表有限公司
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