It is widely used in xenon lamp, cutting gas and medical industry. Due to the small amount of stock in the air, it is a rare gas, and it is difficult to make, so the price has been high. Today, Newradar series takes you to have a comprehensive understanding of the production method and extraction of xenon gas.

Since the amount of xenon in the air is very small and the volume fraction of xenon is about 0.08*10-6, it is very difficult to extract xenon, and the extraction process of xenon also requires many times of extraction to achieve the goal. Since xenon also has a high boiling point and they are always mixed with oxygen in the air separation unit, the oxygen product should be used as the raw material (containing only 0.1 to 0.3 percent xenon), and then the crude xenon should be prepared and then separated. However, to produce pure xenon, krypton xenon boiling point difference can be used for repeated batch distillation.

There are mainly several methods to extract xenon gas from an air separation tower:

1. The method based on rectification;

2. Adsorption as the main method;

3. Use large scale chromatography

The most commonly used method is rectification. Three krypton towers are set in the rectification process. After distillation in a hydrogen column, lean krypton was obtained. The dikrypton tower gets the coarse krypton. In the case of krypton, the concentration of xenon is accompanied by the concentration of hydrocarbons in the oxygen in krypton, either lean or coarse, so that hydrocarbons must be removed after the rectification of the krypton tower and the krypton tower. Generally use heating catalysis method, the poor atmosphere or crude krypton pressure to 0.5MPa, under the condition of 500 -- 550℃, in silver, drilling catalyst contact furnace, make hydrocarbon and oxygen reaction to generate water and carbon dioxide, and then use molecular sieve adsorption dry moisture and carbon dioxide or silica gel in addition to water, with caustic soda solution adsorption carbon dioxide.