| http://www.w3.org/ns/prov#value | - Below an operating pressure of about 622 psia, the purge can be either an inert gas such as nitrogen, carbon dioxide, helium, and the other Inert Gases of the Periodic Table, methane, etc. or a reactive gas such as hydrogen, carbon monoxide or low molecular weight aromatics, olefins and hydrogen donor materials which react with or donate hydrogen to the products produced.
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