Oxygen is obtained on large scale by the fractional distillation of air as shown on the flow chart below.
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Great Oxidation Event - Wikipedia
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Oxygen | Discovery, Symbol, Properties, Uses, & Facts | Britannica
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Comparative analysis of various oxygen production techniques using multi-criteria decision-making methods - ScienceDirect
Oxygen, nitrogen and the rare gases
7 factors that affect oxygen transfer to cells in bioreactors | Cytiva
Diurnal Fe(II)/Fe(III) cycling and enhanced O2 production in a simulated Archean marine oxygen oasis | Nature Communications
Principle sketch for large scale centralized hydrogen production with... | Download Scientific Diagram
The flowchart below shows some of the processes involved in large scale production of sulphuric (IV) - Tutorke
How to collect oxygen in a relatively large scale and sell it for a profit - Quora
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