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Zero-emissions Co-production of H2 and O2 Disclosure Number: IPCOM000167460D
Publication Date: 2008-Feb-13
Document File: 8 page(s) / 61K

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Zero-emissions Co-production of H2 and O2 

There are several references related to the integration of electrolyzers in gasification processes in order to improve the efficiency of the process and make use of renewable energy. However none of these examples are specifically directed at emission-free hydrogen production from fossil fuels.

US4160479 describes an heavy oil recovery process where an electrolyzer is used to produce hydrogen and oxygen, and where the hydrogen is used in the upgrading of heavy oil, while oxygen is used in a gasifier fed with upgraded oil. In turn, electricity produced using the hot gases from the gasifier supplies electrical power to the electrolyzer.

US6187465 describes a carbonaceous feedstock gasification process where at least part of the produced gas is feeding a fuel cell. Hydrogen from an electrolyzer is proposed for balancing the synthesis gas for methanol production with the co-produced oxygen feeding the cathode side of the fuel cell.

US6996965 describes a process for gasifying coal using oxygen produced by electrolysis and steam from the reaction of oxygen and hydrogen, both also produced by the same electrolysis process. The use of renewable electrical energy to feed the electrolysis process is also claimed.

US6645442 describes a process for producing methanol by partial combustion or biomass gasification using hydrogen and oxygen from an electrolyzer, possibly fed by renewable electricity.

Patent EP1240274 describes a process for the partial oxidation of coke obtained by subject biomass to a high temperature. The resulting gas is mixed with hydrogen to produced fuels. Oxygen and hydrogen from the process are produced by electrolysis.

US patent application 2004/0265158 claims the use of intermittent renewable energy for producing hydrogen, subsequent used to produce electrical energy, and oxygen which supplies a biomass gasification system producing synthesis gas which is in turn used to produce more electrical energy.

International application WO2005/056737 claims another process for the production of liquid fuels from a gasification system where an electrolyzer provides oxygen as a gasification agent and hydrogen for the synthesis process. WO2001/038456 is a similar invention using renewable raw materials and regenerative energy.

The object of


patent application 2007/0129449 is to produce liquid fuels from synthesis gas where an electrolyzer is used to produce oxygen as a gasification agent and hydrogen for liquid fuel synthesis from the synthesis gas.

Other patents combining gasification and electrolysis are: JP2005255840, JP2004155279, JP2003183202, JP2001316681, and JP1998017301.

None of the above-mentioned process are directed to the complete oxy-combustion of a carbonaceous feedstock for co-production of hydrogen and oxygen, with a concentrated CO2 by-product s...