Methods for treating an offgas containing carbon oxides
AssigneeSeerstone LLC
InventorDallas B. Noyes
Life of this patent
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Abstract
A method of treating an offgas includes purifying the offgas to remove particulate matter, water, undesirable gaseous components and inert gases to produce a dried carbon oxide gas feedstock, and converting at least a portion of carbon oxides in the dried carbon oxide gas feedstock into solid carbon. In other embodiments, a method includes passing a dried carbon oxide gas feedstock through a multi-stage catalytic converter. A first stage is configured to catalyze methane-reforming reactions to convert methane into carbon dioxide, carbon monoxide and hydrogen with residual methane. A second stage is configured to catalyze the Bosch reaction and convert carbon oxides and hydrogen to solid carbon and water.
Claims14
A method of treating an offgas, the method comprising:
- reacting at least one carbon oxide gas in an offgas from a first unit operation comprising an aluminum smelter or a steel smelter with a reducing gas to form water and at least one of carbon monoxide and carbon dioxide, wherein the offgas comprises the at least one carbon oxide gas, water vapor, and particulate matter;
- removing at least a portion of particulate matter from the offgas to produce an intermediate stream;
- condensing water vapor from the intermediate stream to produce a dried carbon oxide feedstock gas;
- mixing at least one reducing gas with the dried carbon oxide feedstock gas to form a reaction gas mixture;
- converting at least a portion of the carbon oxide gas in the reaction gas mixture into solid carbon while forming a gas stream containing water vapor;
- processing at least a portion of the solid carbon in a second unit operation to form a recycle feedstock comprising the at least a portion of the solid carbon;
- and
- recycling the recycle feedstock to the first unit operation.
Dependencies are inferred from the claim text.