Method for producing hydrogen with intermediate pressure purge

摘要

Producing hydrogen from a hydrocarbon feedstock and steam comprises: producing a synthesis gas in a steam reforming unit of hydrocarbon feedstock in presence of steam, fuel providing needed heat to the reaction; converting synthesis gas to the obtained steam to produce a hydrogen flow having methane and carbon dioxide; capturing carbon dioxide in the obtained flow to steam to separate carbon dioxide from the hydrogen stream; and collecting and recycling, towards the steam reforming of impurities in the hydrogen stream, including a decompression phase at a pressure of 0.2-1.4 MPa.