1891 - 1934. From air liquefaction to air separation

With air liquefaction, Carl von Linde created the conditions needed to produce pure gases using low-temperature processes. These gases include not only oxygen and nitrogen, but also hydrogen and inert gases - a technology for which the future has only just begun.

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Prominent themes from this period:

Air liquefaction, "Linde Air," rectification: into new markets with new research findings
The oxygen business
First World War and The Great Depression: return to old strength through innovation