Process for the synthesis of ammonia
AssigneeCasale SA
InventorsRaffaele OSTUNI, Ermanno FILIPPI, Umberto ROSSI
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Abstract
Process for the synthesis of ammonia comprising the steps of reforming of a hydrocarbon feedstock into a raw product gas, purification of said raw product gas obtaining a make-up synthesis gas, conversion of said synthesis gas into ammonia; said purification includes shift conversion of carbon monoxide into carbon dioxide and the reforming process requires a heat input which is at least partially recovered from at least one of said step of shift conversion, which is carried out with a peak temperature of at least 450° C., and said step of conversion into ammonia.
Claims15
A process for the synthesis of ammonia comprising the steps of:
- reforming of a hydrocarbon feedstock into a raw product gas, said reforming requiring a heat input;
- purification of said raw product gas obtaining a make-up synthesis gas;
- conversion of said synthesis gas into ammonia, wherein said purification includes shift conversion of carbon monoxide into carbon dioxide, wherein said heat input of the reforming process is at least partially recovered from at least one of:
- said step of shift conversion, which is carried out with a peak temperature of at least 450° C.;
- said step of conversion into ammonia.
A method for revamping an ammonia plant, said plant comprising a front-end section including a reforming section and a purification section, providing a make-up synthesis gas, and one or more ammonia reactors for the conversion of said synthesis gas into ammonia, said purification section including at least one shift converter, said method comprising the step of:
- adding a heat exchanger arranged to recover heat from said shift converter and transfer said heat to said reforming section, and further comprising the step of increasing the gas peak temperature of said shift converter to 450° C. or more, and/or
- adding a heat exchanger arranged to recover heat from said one or more of said reactors, and transfer said heat to said reforming section.
Dependencies are inferred from the claim text.