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Stabile stable isotope (22)Ne, (20)Ne product gas purity analytical method

A stable isotope, gas purity technology, applied in the analysis of materials, material analysis using wave/particle radiation, material separation, etc., can solve problems such as unsuitability for detection, difficult to distinguish oxygen peaks, affecting the accuracy of measurement, etc.

Inactive Publication Date: 2008-11-26
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In Du Xiaoning, Li Hulin et al.'s " 22 Gas Chromatographic Analysis of Trace Impurities in Ne Isotope Separation", ("Chemical World", No. 11, 2004), once used high-purity hydrogen as carrier gas to compare isotope gas 22 Ne was tested for purity, but due to the interference of the main peak of neon, the peak of oxygen was difficult to distinguish, thus affecting the accuracy of the determination
Furthermore, this method can only be used to determine 22 Trace impurities in Ne isotope gas, not suitable for 22 Ne, 20 Trace impurity H in Ne isotope mixture gas 2 detection of

Method used

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  • Stabile stable isotope (22)Ne, (20)Ne product gas purity analytical method
  • Stabile stable isotope (22)Ne, (20)Ne product gas purity analytical method
  • Stabile stable isotope (22)Ne, (20)Ne product gas purity analytical method

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Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1 (on-line analysis)

[0053] Using GC8800H gas chromatograph, HL-3000 chromatographic workstation, stainless steel chromatographic column, (13x×5A molecular sieve stationary phase), column temperature: 60°C, detector temperature: 90°C, thermal conductivity bridge flow: 70mA, and a planar four-way valve active quantitative sampler with a volume of 1mL for sampling.

[0054] The balance gas is 99.999% high-purity neon gas, in which 12.2ppmH is added 2 , 25.9ppmO 2 , 20.0ppmN 2 as a standard gas. Connect the standard gas to the carrier gas inlet and outlet 1 and 2, continuously purge the pipeline with standard gas (gas velocity 50mL / min) for 20 minutes, and rotate the four-way valve to seal the standard gas sample in the quantitative tube in the quantitative tube 7; then Turn the chromatographic sampling system valve to the analysis position. The carrier gas brings the gas outside the quantitative tube into the chromatographic column through the sample ...

Embodiment 2

[0061] Embodiment 2 (off-line analysis)

[0062] Using GC8800H gas chromatograph, HL-3000 chromatographic workstation, stainless steel chromatographic column, (13x×5A molecular sieve stationary phase), column temperature: 60°C, detector temperature: 90°C, thermal conductivity bridge flow: 70mA, and a planar four-way valve active quantitative sampler with a volume of 1mL for sampling.

[0063] The balance gas is 99.999% high-purity neon gas, in which 12.2ppmH is added 2 , 25.9ppmO 2 , 20.0ppmN 2as a standard gas. Connect the standard gas to the carrier gas inlet and outlet 1 and 2, continuously purge the pipeline with standard gas (gas velocity 50mL / min) for 20 minutes, and rotate the four-way valve to seal the standard gas sample in the quantitative tube in the quantitative tube 7; then Turn the chromatographic sampling system valve to the analysis position. The carrier gas brings the gas outside the quantitative tube into the chromatographic column through the sample ...

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Abstract

The invention relates to a chromatographic method for producing trace impurities in products of stable isotopes of <22>Ne and <20>Ne with a thermal diffusion method and is characterized by realizing the once detection of the gas purity of stable isotopes of <22>Ne and <20>Ne with a gas chromatographic method by applying the mathematical probability theory of key component analysis and adopting a three point generalization method while combining the real separation conditions of isotopes. The method indirectly realizes the analysis on the chemical purity of the <22>Ne and <20>Ne by detecting the contents of oxygen, nitrogen and hydrogen in the gas of the products of <22>Ne and <20>Ne. The method has the gas detection sensitivity as high as 99.99% towards the gas purity of the isotope products of high-purity <22>Ne and <20>Ne. The detection sensitivity of the method towards the impurities in the products of H2, O2 and N2 reaches the grades from 3 to 20ppm and the injection volume reaches 0.5 to 1.2ml and also the invention is good in reproducibility, fast in speed, simple and convenient in method and can be easily applied to the production quality control of the stable isotopes of <22>Ne and <20>Ne and the analysis of working gas component of the laser gyro preparation process.

Description

technical field [0001] The invention relates to a method for analyzing the gas purity of stable isotope Ne products. Background technique [0002] Neon is usually a product obtained by cryogenic fractionation of air, and the stable isotope 22 Ne, 20 Ne is the isotopic product gas obtained by using this as a raw material for separation. isotope 22 Ne, 20 Ne is the main working gas for manufacturing laser devices such as laser gyroscopes, and is widely used in aerospace, navigation, positioning and orientation systems, missiles, machining, and civilian medical equipment. [0003] Thermal diffusion is one of the most basic methods for isotope separation. In the prior art, it has been recorded that Ne isotope product gas is obtained by separating and obtaining Ne isotope product gas by thermal diffusion method. For example, the inventors are Li Hulin, Chen Xiansong, etc., and the name of the invention is "Zhongfengdu 22 The Chinese patent CN1233445C (ZL02151014.8) of "Sep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/00G01T1/167G01N30/26G01N30/62
Inventor 杜晓宁李虎林于国庆
Owner SHANGHAI RES INST OF CHEM IND
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