Patent ID: 9028794
Filing Date: 2015-05-12
Classification: C01B,Y02C,Y02P

Abstract:
1. A process for the production of hydrogen in combination with capture of carbon dioxide starting from a mixture of hydrocarbons, the process comprising the steps of: (a) reforming the mixture of hydrocarbons in a reformer in order to obtain a crude synthesis gas comprising hydrogen, carbon monoxide, carbon dioxide, methane, water vapor and impurities; (b) cooling the crude synthesis gas with recovery of the available heat; (c) reacting all or part of the cooled crude synthesis gas in a shift reaction thereby oxidizing most of the carbon monoxide in the presence of water to produce carbon dioxide with corresponding production of hydrogen to produce a synthesis gas enriched in H (d) cooling the synthesis gas enriched in H (e) drying the cooled synthesis gas thereby producing a dry synthesis gas; (f) separating the constituents of the dry synthesis gas in a pressure swing adsorption unit thereby producing a high-pressure stream enriched in hydrogen and a waste gas stream predominantly comprising carbon dioxide and hydrogen but also comprising carbon monoxide, methane and impurities; (g) compressing said waste gas stream such that its pressure is between 20 and 100 bar; (h) introducing the waste gas stream to a second shift reactor under conditions effective for a water-gas shift reaction to form a second shift stream and then drying the second shift stream to produce a first dry gas stream depleted in CO and enriched in CO (i) treating the first dry gas stream in order to separate CO (j) treating the gaseous capture waste product stream in order to produce a fuel stream, wherein the fuel stream is sent to a burner of the reformer to be burned as fuel, wherein the fuel stream comprises the non-condensable constituents from the gaseous capture waste product stream from step (i).