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How Can Oxygen Be Separated And Purified In The Air?

Liquid oxygen fractionation is widely used in large-scale industrial production of oxygen.

First of all, the air is removed by filters, such as dust and other solid impurities, into the compressor compression, and then through the molecular sieve purifier to remove water vapor and carbon dioxide and other impurities. Here, molecular sieves can make small molecules such as nitrogen and oxygen pass through and play a role in screening molecules. Then cooling and depressurization, when the temperature dropped to about 170 degrees Celsius, the air began to liquefy partially into the distillation tower, according to the different boiling points of the gas in the air fractionation. The boiling point of Liquid Oxygen is higher than that of liquid nitrogen, and it is easier to be gasified than liquid nitrogen. More than 99% pure oxygen can be obtained by multi-step fractionation, and nitrogen and rare gas extraction materials can be obtained simultaneously.

This method is complicated. If the oxygen with low purity is needed, the air can be separated by molecular sieve adsorption to produce oxygen. The adsorption capacity of specific molecular sieve to nitrogen is greater than that of oxygen. When air passes through the molecular sieve bed, the oxygen content of the outflow gas is higher, and the gas containing 70 - 80% oxygen can be obtained after repeated adsorption. This method is operated at normal temperature, short cycle cycle, and easy to realize automation.

In addition, high purity oxygen can be produced by electrolysis water method. This method has high cost and is only suitable for small-scale production.

Oxygen isolated from the air is usually stored in a cylinder of azure blue for use in industry, medical care, or other aspects.


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