Claude Process

Ammonia synthesis is the basis for agricultural fertilizer production and nowadays the Haber-Bosch process is ubiquitous.

The Claude Process. This process is [sic] worked at numerous factories
in France and Belgium. The cost of the hydrogen used in the
HABER-BOSCH process accounts for about 75 per cent of the cost
of the ammonia produced: in the CLAUDE process the hydrogen is
made by the electrolysis of water. Some of this hydrogen is burned
in air, leaving nitrogen to be used in the ammonia synthesis and
synthetic water suitable for the electrolytic cells. The rest of the
plant, which works at 750 atmospheres, will be understood from the
diagram. To withstand the enormous pressures the converters are
made of special steel, and the catalyst is mounted on a gun breech-
block device to allow easy withdrawal for replacement. Many
variations of the process are possible; in some the nitrogen is
obtained from producer-gas, in others from liquid air.

A Textbook of Theoretical and Inorganic Chemistry, F.A Philbrick, E.J.Holmyard, 1932