Bulk ProductionOxygen, nitrogen, argon and other rare gases are produced by means of air separation. It was Carl von Linde who developped this cryogenic process more than 100 years ago.
First, air is purified of moisture, dust and carbon dioxide, then compressed and cooled down to extremely low temperatures until liquification. The separation into the different compontens N2, O2 and Ar is achieved through rectification.
 Animation: Principle of Air Separation (SWF in German, 118kB)
The Linde air separation units which supply Linde Nippon Sanso are planned and constructed in-house by the Linde Engineering Division.
Today, also other physical procedures are used for separation and purification of air gases, e.g. membrane or adsorption separation.
Non-atmospheric bulk gases are manufactured by means of chemical process plants also designed by Linde Engineering. Hydrogen for example is produced by means of steam reformation from natural gas.
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