Cryogenic vacuum insulated oxygen - generator for use as on - site - air separator for the production of highly pure, gaseous oxygen with at least one, in an insulation space is enclosed by an insulating sheath, which is arranged a lower medium-pressure column and an upper low-pressure column with rectifying and rectification column internals, and liquid collector with a in the lower region of the upper low-pressure column and condenser arranged with a heat exchanger and equipped with a supercooler, as well as with a the upper low-pressure column with an outside of the insulation space arranged, liquid oxygen stored in a storage container be connected to the feed line for the supply of liquid oxygen (lox) with an air duct for the supply of separation air, with an oxygen product line for the removal of a gaseous oxygen product, with an oxygen line to the trigger a in the bottom area of the lower medium-pressure column and the oxygen-enriched bottom liquid with a arranged in the head part of the upper low-pressure column nitrogen product line for the removal of a gaseous nitrogen product is connected, characterized in that the cryogenic vacuum-insulated oxygen - generator at least one the lox - storage container (6) with the rectification column (1) and connecting in different pressure ranges of the upper..
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