Method for analyzing content of krypton and xenon in krypton and xenon feed gas

An analysis method and raw gas technology, which are applied in material separation, analysis materials, measurement devices, etc., can solve the problems of chromatographic peak masking, roughness, and inability to accurately quantify content, and achieve the effect of fast and accurate detection.

Active Publication Date: 2014-01-01
WUHAN IRON & STEEL GRP GAS CO LTD
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Problems solved by technology

This method is too rough to accurately quantify the exact content of krypton and xenon in the feed gas
[0004] There are several problems in the accurate quantification of krypton and xenon in raw gas: 1. According to production experience, krypton in raw gas contains about 1200×10 -6 (volume fraction), xenon contains approximately 100×10 -6 (volume fraction), there is a problem of large differences in component content
There are separation problems during quantification
3. The main component of krypton-xenon raw material gas is oxygen, and oxygen has the problem of covering the chromatographic peak when determining the content of krypton gas
4. The molecular mass of xenon gas is relatively large, so there is a problem of long retention time

Method used

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  • Method for analyzing content of krypton and xenon in krypton and xenon feed gas

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Embodiment

[0029] The present invention is further described as follows: the krypton-xenon raw material gas is collected from the rare production line of Oxygen Company.

[0030] 1) Prepare the xenon-containing gas with a volume content of 101×10 -6 (volume fraction), the volume content of krypton gas is 1006×10 -6 (volume fraction), methane gas volume content is 1005×10 -6 (volume fraction) of 8L standard gas bottle, the rest is helium (standard gas).

[0031] 2) Using helium as the carrier gas, use a miniature thermal conductivity analyzer (produced by Varian, model CP4900) to measure the standard gas and krypton-xenon raw material gas respectively, Figure 4 and Figure 5 The instrument test conditions:

[0032] The instrument uses N5 grade (99.999%) high-purity helium as the carrier gas.

[0033] Chromatographic column: Propark Q column Column length: 10 meters Column diameter: 0.32mm Column temperature: 80°C

[0034] Control gas pressure: 0.3 MPa Carrier gas pressure: 150 kPa ...

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Abstract

The invention relates to a method for analyzing content of krypton and xenon in krypton and xenon feed gas, and the problem that the content of krypton and xenon in existing krypton and xenon feed gas can not be analyzed accurately is solved. According to the method, a mini-type thermal conductance analyzer serves as a main body, measurement is carried out by a capillary chromatographic column, helium serves as carrier gas, the mini-type thermal conductance analyzer is used for measuring the peak area of the krypton and the peak area of the xenon in the krypton and xenon feed gas, and then the volume content of the krypton and the volume content of the xenon are calculated. The method can accurately measure the content of the main components such as the krypton and the xenon in the krypton and xenon feed gas, can meet the requirement for selecting the mass of the feed gas in the early stage of production of the krypton and the xenon, and is fast and accurate in detection, the deviation ratio is far less than 3%, and the detection time can be shortened to be within 50 seconds.

Description

technical field [0001] The utility model relates to a method for analyzing krypton-xenon raw material gas, in particular to a method for analyzing the content of krypton and xenon in the krypton-xenon raw material gas. Background technique [0002] Krypton and xenon are very precious because of their very small content in the atmosphere, so they are called "rare gases" and "golden gases", and the price is extremely high; extraction is difficult, and can only be extracted in large and extra-large air separation plants. Widely used in electric light source, welding and scientific research and medical treatment. [0003] The raw material gas of krypton and xenon is mainly liquid oxygen in the main cooling heat exchanger in the air separation production process, where a large amount of krypton and xenon are enriched in the liquid oxygen, but it also contains a large amount of methane and other impurity components. At present, for the monitoring of krypton-xenon raw material gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 谢程
Owner WUHAN IRON & STEEL GRP GAS CO LTD
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