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Method for quickly analyzing gas mixture by determining hydrogen and carbon monoxide

A mixed gas and rapid analysis technology, applied in the field of analytical chemistry, can solve the problems of complicated operation, high instrument price, and complicated setting of the thermal conductivity pool of the detection terminal, so as to achieve the effect of many detection items and a wide range of applications.

Inactive Publication Date: 2016-03-23
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above methods are relatively mature, they are still relatively cumbersome to operate, especially gas chromatography, glycerol volumetric method and mercury volumetric method
However, for the determination of thermal conductivity, the price of the instrument is relatively high and the measurement object is relatively single.
And continuous conversion is required, and the setting of the thermal conductivity pool at the detection terminal is relatively complicated

Method used

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  • Method for quickly analyzing gas mixture by determining hydrogen and carbon monoxide
  • Method for quickly analyzing gas mixture by determining hydrogen and carbon monoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Determination of hydrogen content in gas: will contain hydrocarbons CnHm, O 2 , CO, CH 4 、H 2 and N 2 A certain volume of gas enters the high-purity carrier gas (argon) flow through the six-way valve of the gas chromatograph, and then the carrier gas passes through 30% potassium hydroxide solution to remove acid gases such as CO2, silica gel to remove moisture, molecular sieve column (particle diameter Between 0.1-4 mm) to remove organic matter. will then contain carbon monoxide and H 2 The carrier gas passes through the Schutz reagent (particle diameter about 0.1 mm) column, and finally the carrier gas carries the displaced elemental iodine and carbon dioxide and uses full-spectrum direct-reading ICP-AES to obtain carbon monoxide and H through indirect measurement. 2 content. The gas generated after the acidification of the potassium hydroxide solution was sent to the full-spectrum direct-reading ICP-AES, and the measured contents of carbon dioxide and sulfur were...

Embodiment 2

[0032] Determination of hydrogen content in gas: will contain hydrocarbons CnHm, CO 2 , CO, H 2 and N 2 A certain volume of gas enters the high-purity carrier gas (argon) flow through the six-way valve of the gas chromatograph, and then the carrier gas passes through 30% potassium hydroxide solution in sequence, and then the molecular sieve (particle diameter 0.6mm, 4A type and 13X type Mixed at a ratio of 1:1) to remove water vapor and organic matter. The purified carbon monoxide and H 2 The carrier gas passes through the Schutz reagent (coated on silica gel with a particle diameter of about 1 mm) column, and then the carrier gas carries the displaced elemental iodine and carbon dioxide for detection by full-spectrum direct-reading ICP-AES, and obtains carbon monoxide and carbon dioxide through indirect measurement. h 2 content. The gas generated after the acidification of the potassium hydroxide solution is sent to the full-spectrum direct-reading ICP-AES, and the conte...

Embodiment 3

[0034] Determination of hydrogen content in petroleum cracking gas: will contain CO 2 , CO, ethylene, H 2 A certain volume of petroleum cracked gas enters the high-purity carrier gas (argon) flow through the six-way valve of the gas chromatography, and then the carrier gas passes through 30% potassium hydroxide solution in sequence, and then molecular sieves (particle diameter 0.6mm, type 4A and Type 13X is mixed in a 1:1 ratio) to remove water vapor. Then the purified only H 2 The carrier gas of CO and CO passes through the Schutz reagent (70 mesh) column, and then the carrier gas carries the displaced iodine and carbon dioxide for detection by full-spectrum direct-reading ICP-AES, and the simultaneous determination of iodine and CO 2 content. H is obtained indirectly by subtracting the amount of carbon dioxide from the measured amount of iodine 2The content is 43%. The content of carbon monoxide is the same as that of carbon dioxide (moles), which is 27%.

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Abstract

The invention discloses a method for determining various components in an industrial gas by adopting a full-spectrum direct reading type inductive coupling plasma atomic emitting light method. The method comprises the following steps: (1) passing a gas mixture through a potassium hydroxide solution, thereby removing the acidic gases, such as carbon dioxide, hydrogen sulfide, sulfur dioxide, in the gas mixture by absorbing; (2) passing the gas after the acidic gases removal through a dewatering device, thereby dewatering; (3) passing the gas after dewatering through an organic matter removing device, thereby removing the organic matters; and (4) reacting the gas only containing hydrogen and carbon monoxide after the purification in advance with Schutz reagent, thereby generating carbon dioxide and iodine, and acquiring the content of carbon monoxide in the to-be-analyzed gas by determining generated carbon dioxide, acquiring the content of hydrogen by subtracting the content of carbon dioxide from the content of generated iodine. Compared with the traditional method, the method disclosed by the invention has the characteristics of high accuracy, low detection limit, high test speed and strong practicability.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry and relates to an analysis method for components in industrial gases, especially carbon monoxide and hydrogen, including diffusible hydrogen in metals. Specifically, it is a method for rapid analysis of mixed gases by measuring hydrogen and carbon monoxide. Background technique [0002] Industrial gases are produced in a wide range of fields, including raw material gas and waste gas, which generally include gases in the following fields: (1) gas fuel: natural gas, coke oven gas, petroleum gas, water gas; (2) chemical raw material gas: yellow Iron ore roasting furnace gas, lime roasting kiln gas; (3) Gas products: hydrogen, nitrogen, oxygen, helium, acetylene, etc. (3) Waste gas: CO, CO 2 , nitrogen oxides, etc.; (4) Plant air: generally contains production gases. [0003] In addition to the above-mentioned industrial gases, the determination of carbon, hydrogen (including diffusib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N21/25G01N21/3504
CPCG01N21/25G01N21/3504G01N31/00
Inventor 段旭川
Owner TIANJIN NORMAL UNIVERSITY