Method And Plant For Producing Ammonia

Abstract: A method for producing ammonia by catalytically reacting hydrogen provided in a first feed stream and nitrogen provided in a second feed stream is proposed, the hydrogen in the first feed stream being at least in part formed by water electrolysis and the nitrogen in the second feed stream being at least in part formed by cryogenic air separation, wherein said cryogenic air separation is performed using an air separation unit (30) comprising a rectification column system (31), a recycle stream being formed in the air separation unit (30) from a gas stream at least predominantly comprising nitrogen which is withdrawn from the rectification column system (31), the recycle stream being, in the order indicated, compressed, cooled, expanded and reintroduced into the rectification column system, and wherein waste heat from said catalytically reacting hydrogen and nitrogen is transferred to a steam system (21) providing steam. Said cooling the recycle stream comprises transferring heat from the recycle stream to the steam system (21). A corresponding plant (100, 200) is also part of the invention.

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