Process and plant for the production of ammonia make-up gas including production of a hydrogen gas by steam reforming

Abstract

A process and plant for producing a makeup synthesis gas () for the synthesis of ammonia, comprising: reforming of a hydrocarbon feedstock () in a steam reformer (SMR), purification of said gas product obtaining a hydrogen synthesis gas, addition of a suitable amount of nitrogen () to said hydrogen synthesis gas, wherein said purification includes separation of hydrogen in a main separation unit (S), which produces a hydrogen current () and a tail gas (), and wherein further hydrogen is recovered from the said tail gas () in an additional separation unit (S); some embodiments provides that an amount of gas product () is also fed to said additional separation unit; a corresponding method for the revamping of a front-end of an ammonia plant is also disclosed.