The present invention relates to a cryogenic vacuum-insulated oxygen - generator for use as on - site - air separator for the production of highly pure, gaseous oxygen, with at least one the lox - storage container (6) with the rectification column (1) and connecting in different pressure ranges of the upper low-pressure column of the rectification column (1) arranged feed line (7). Dollars a the inventive includes cryogenic vacuum-insulated oxygen - generator is advantageous particularly host switching site, uranium-235, small air burster with an oxygen - production capacity of up to 500 m · 3 · / h can be used.
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