Patent ID: 6667022
Filing Date: 2003-12-23
Classification: B01D,B01J,C01B,C10J,H01M,Y02C,Y02E,Y02P

Abstract:
A process for separating syngas into fuel cell quality hydrogen and sequestration ready carbon dioxide, comprising the steps ofcirculating a mixture of solids comprising calcium compounds present as CaO, Ca(OH)2 and CaCO3 and mixtures thereof, and iron compounds present as FeO, Fe2O3, Fe3O4 and mixtures thereof, between first and second fluidized bed reactors; charging said first fluidized bed reactor with a first gas mixture (syngas) containing high temperature steam, H2, CO2 and CO; charging said second fluidized bed reactor with a second gas mixture containing high temperature steam and oxygen; reacting CO2 present in said first gas mixture with CaO present in said first fluidized bed reactor to form CaCO3; reacting a portion of CO present in said first gas mixture with steam in a water gas shift reaction to form hydrogen and CO2 and reacting the remaining portion of CO present in said first gas mixture with iron oxide to form FeO and CO2; circulating CaCO3 and FeO formed in said first fluidized bed reactor to said second fluidized bed reactor; oxidizing FeO present in said second fluidized bed reactor to form Fe2O3; removing substantially pure hydrogen from said first fluid bed reactor; and removing CO2 and SO2 from said second fluid bed reactor.