A method and device for enriching and purifying atmospheric xenon
A purification method and technology of purification device, which are applied in chemical instruments and methods, measuring devices, inert gas compounds, etc., can solve the problems of low xenon enrichment and purification efficiency, high operating cost, complex structure, etc. The effect of improving sampling efficiency and reducing operating costs
Active Publication Date: 2020-11-06
北京放射性核素实验室 +1
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Problems solved by technology
[0005] However, the enrichment and purification efficiency of xenon in this device is relatively low, the volume is large, and helium or nitrogen cylinders are required to provide the carrier gas for desorption, transfer and regeneration of the adsorption columns at all levels, resulting in complex structure and high operating costs.
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[0061] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0062] In this embodiment, membrane dryers and membrane separators are first used to remove most of the water vapor, oxygen, carbon dioxide and part of nitrogen in the air, and the xenon in the air is initially concentrated; the membrane dryers use hollow fiber water removal membrane modules, membrane The separator is a combination of M branch series and / or parallel hollow fiber nitrogen-enriched membrane modules, M is greater than or equal to 2; then the treated gas is concentrated in three stages; the concentration process includes the process of step-by-step normal temperature adsorption and high temperature desorption on the concentration device , the concentration device in this embodiment is three kinds of carbon molecular sieve packed columns with different specifications, including the first stage carbon molecular sieve packed column, th...
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Abstract
The invention belongs to atmospheric radiation environment monitoring and a system and method for monitoring the safety operation of nuclear facilities, and provides a method and device for concentrating and purifying atmospheric xenon and a preparation method of a carbon molecular sieve. The method comprises the steps of pretreatment, tertiary concentration, tertiary concentration and sample collection. In the pretreatment process, M hollow fiber nitrogen-rich film assemblies of a same model number and / or different model numbers are connected in series and / or in parallel to separate the air,so that the problem in the prior art that the xenon concentration and purification efficiency is low can be solved, the amount of the xenon acquired in 24 hours by virtue of the system is not less than 5mL, and the xenon volume specific concentration is greater than 20 percent.
Description
technical field [0001] The invention belongs to a monitoring system and method for atmospheric radiation environment monitoring and safe operation of nuclear facilities, in particular to a high-efficiency atmospheric xenon enrichment and purification method and device. Background technique [0002] The volume fraction of the rare gas xenon in the air is 8.7×10 -8 (V / V), in which the content of radioactive xenon isotopes is lower and difficult to analyze directly. Radioactive gas xenon sampling is to separate and enrich xenon isotopes from the ambient atmosphere, and make it meet the quantitative detection sensitivity of xenon analysis instruments and the requirements of radioactive xenon isotope content of radioactive measuring instruments. Therefore, it is necessary to efficiently concentrate xenon from a large amount of air to in a small volume. [0003] Invented by Zhou Chongyang and others in the 63653 Unit of the Chinese People's Liberation Army, the patent number is ...
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IPC IPC(8): C01B23/00C01B32/306C01B32/336G01N30/06G01N30/08G01N30/14G01N30/02G01N30/72B01J20/281
CPCB01J20/281C01B23/0036C01B32/306C01B32/336C01B2210/0012C01B2210/0017C01B2210/0037G01N30/02G01N30/06G01N30/08G01N30/14G01N30/72G01N2030/146
Inventor 陈占营常印忠黑东炜刘蜀疆
Owner 北京放射性核素实验室