Method for separating and purifying xenon in atmosphere by use of active carbon and device thereof

Abstract

The invention relates to a method for separating and purifying xenon in the atmosphere by the use of active carbon and a device thereof. The method comprises the following steps of: adsorbing xenon in the air by using active carbon, collecting gases during the xenon desorption period by the utilization of desorption temperature difference of different substances on active carbon, separating foreign gases such as carbon dioxide, radon and the like, carrying out gradual enrichment and purification through a four-grade adsorption column, and concentrating and collecting the gas into a small container. According to the invention, separation and purification are carried out by the utilization of the desorption temperature difference of xenon and the foreign gases on the active carbon adsorption column, and adsorption, separation and purification are all carried out on the active carbon column so as to reduce a separate impurity removing device. The method is simple. The device provided by the invention can be used to monitor a nuclear power plant, a nuclear reactor, nuclear waste treatment, medical facility leakage and radioactive xenon isotope releasing, and is also used for monitoring the atmospheric nuclear environment.

Description

technical field [0001] The invention relates to the separation and purification of rare gases. Activated carbon is used as the adsorbent to fill the adsorption column. Substances such as xenon, radon and carbon dioxide in the atmosphere are adsorbed in the activated carbon adsorption column. The different desorption temperatures of different substances on the activated carbon are used to control different The heating rate removes impurity gases such as carbon dioxide and radon, realizes the separation and purification of xenon, and provides technical services for environmental monitoring. Background technique [0002] The concentration of stable xenon in the air is very low, with a global average of about 8.7×10 -8 (v / v), difficult to measure and collect. Document retrieval disclosure: German Linde AG Alfred Vanner et al. have a patent with the invention number CN1929455 "Method for Obtaining Krypton and / or Xenon by Low-Temperature Separation of Air", which introduces compr...

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Problems solved by technology

The xenon and radon gases used in this method are high-concentration standard gases, which cannot directly process air samples with complex gas components; the separation device uses five-stage adsorption columns and two adsorption materials, which increases the complexity of the device and the difficulty of operation. ; The activation treatment of carbon molecular sieves before use takes a long time and the operating conditions are complicated

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