초록 ▼

Ammonia synthesis gas is produced by reaction of steam, an oxidant, and a major portion of fresh hydrocarbon feed in an exothermic catalytic reforming zone to a first reformed gas having very low methane content. The balance of the fresh feed is reacted with steam in an endothermic catalytic reformi

Ammonia synthesis gas is produced by reaction of steam, an oxidant, and a major portion of fresh hydrocarbon feed in an exothermic catalytic reforming zone to a first reformed gas having very low methane content. The balance of the fresh feed is reacted with steam in an endothermic catalytic reforming zone to a second reformed gas having a low methane content. The first and second reformed gases are combined and passed in indirect heat exchange with reactants in the endothermic reforming zone to provide all of the heat required therein and are then recovered as raw ammonia synthesis gas.

대표청구항 ▼

A method for producing a raw ammonia synthesis gas from a fresh hydrocarbon feed which consists of: (a) forming a first mixed feed comprising steam, a major portion of the fresh hydrocarbon feed, and an oxidant selected from the group consisting of air and oxygen-enriched air, introducing the first

A method for producing a raw ammonia synthesis gas from a fresh hydrocarbon feed which consists of: (a) forming a first mixed feed comprising steam, a major portion of the fresh hydrocarbon feed, and an oxidant selected from the group consisting of air and oxygen-enriched air, introducing the first mixed feed to an exothermic catalytic steam reforming zone wherein there is produced a first reformed gas containing less than 1.0 volume percent, dry basis, residual hydrocarbon, and withdrawing the first reformed gas therefrom; (b) forming a second mixed feed comprising steam and a remaining minor portion of the fresh hydrocarbon feed, introducing the second mixed feed to an endothermic catalytic steam reforming zone wherein there is produced a second reformed gas containing less than 4.0 volume percent, dry basis, residual hydrocarbon, and withdrawing the second reformed gas therefrom; (c) combining the first and second reformed gases and cooling the combined first and second reformed gases by passing the combined gases in indirect heat exchange with the second mixed feed within the endothermic catalytic steam reforming zone whereby all of the heat required for the endothermic catalytic steam reforming of the second mixed feed therein is provided; and (d) withdrawing and recovering the resulting cooled combined gases as raw ammonia synthesis gas product.