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AssigneeConsejo Superior De Investigaciones Cientificas (Csic)
InventorsJuan Carlos ABANADES GARCIA, Gemma Susana GRASA ADIEGO
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This invention discloses a hydrogenation method of CaCO3 with H2 to produce CaO and a syngas product gas containing H2, CO, CO2 and H2O, preferably with a H2/CO mol ratio close to 2. The method operates by arranging a solids containing CaCO3 2024/115103 and at least CaO (as reverse water gas shift catalyst) in a reactor, heating them to a temperature that depends on operating pressure and feeding H2 to react with them and cause a cooling of the solids while producing a syngas and a solids mixture containing an increased fraction of CaO. The method operates continuously by cyclically recarbonating the CaO with the CO2 contained in a gas, or by feeding new CaCO3 to the bed of solids and extracting an equimolar quantity of CaO.
Method of hydrogenation and calcination of CaCO3 in a thermally insulated vessel by reacting it with H2, to produce CaO and a syngas containing at least H2, CO, H2O and CO2, characterised by a sequence of at least the following consecutive steps carried out at least twice:
Method according to any one of claims 1 to 3, wherein the fuel in step i) is a choice of H2 or a C-fuel, and the comburent a choice between air, enriched air or pure O2.
Dependencies are inferred from the claim text.