Patent ID: 11932951
Assignee: HALDOR TOPSØE A/S
Field: Surface technology, coating (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A method for generating a nitrogen part of ammonia synthesis gas by electrolysis, said method comprising the steps of:
feeding a mixture of steam and compressed air into a first of a series of electrolysis units;
applying an operating voltage in the first of the series of electrolysis units for electrolysis of the steam to oxygen on an anode side and hydrogen on a cathode side;
passing a cathode side outlet from one electrolysis unit to an inlet of a next electrolysis unit of the series of electrolysis units; and
either (a) adding compressed air after each electrolysis unit of the series of electrolysis units, or (b) only adding compressed air after a last electrolysis unit of the series of electrolysis units,
wherein the series of electrolysis units are run in thermoneutral or endothermal mode, and
wherein the method further comprises:
providing the nitrogen part of the synthesis gas by burning the hydrogen produced by steam electrolysis by air inside the electrolysis units of the series of electrolysis units.