Application

High purity oxygen is used

◇for the formation of silicon dioxide and metal oxide, as an etchant for photoresist, and in mixtures with halocarbons for etching silicon

◇in conjunction with high purity methane in Advanced Gas Cooled (AGR) nuclear reactors to maintain an appropriate arbon balance in the (CO2) gas coolant in the nuclear core

◇in the optical fibre production process

◇used in the transportation of live fish and seafoods

◇for enrichment of air during fermentation

……

Process

Oxygen is obtained on a commercial scale by the liquefaction and subsequent distillation of air. For very high purity oxygen it is normally necessary to take the product from an air separation plant through a secondary purification and distillation stage. Alternatively high purity oxygen may be produced by the electrolysis of water. Lower purities of oxygen an also be produced with membrane technique.

Emergency Measures

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