Hydrogen Production via Partial Oxidation With CO2 Sequestration
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Solution Overview
Problem
Conventional hydrogen production methods, particularly steam reforming, are energy-intensive and result in significant carbon dioxide emissions, with fossil fuels being the primary source, necessitating a shift towards low-carbon pathways using renewable resources and carbon dioxide sequestration.
Innovation Solution
A process involving partial oxidation of a mixture of natural gas and renewable propane, combined with carbon dioxide sequestration, to produce hydrogen with reduced carbon life cycle emissions, achieving at least 85% carbon capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam reforming is used to produce hydrogen, then hydrogen production efficiency is improved, but carbon dioxide emissions increase significantly
Solution Approach 1:
The patent captures the harmful carbon dioxide emissions from steam reforming and converts them into a beneficial product by reacting with potassium hydroxide to form potassium carbonate, which is then used as a precursor for potassium metal production. This transforms the waste emission into a valuable resource, simultaneously maintaining high hydrogen production efficiency while eliminating environmental harm.
Solution Approach 2:
Instead of discarding carbon dioxide emissions into the atmosphere, the patent implements a recovery system where carbon dioxide is captured from the reforming process, reacted to form potassium carbonate, and further processed to produce potassium metal. This recovery approach converts what would be waste into a valuable product, resolving the contradiction between productivity and environmental impact.
2Ease of manufacture
If fossil fuels are used as hydrogen feedstock, then hydrogen production cost is reduced, but life cycle carbon emissions increase
Solution Approach 1:
The patent changes the chemical parameters of the process by using potassium hydroxide absorption instead of conventional carbon capture methods. This parameter change enables the simultaneous achievement of low cost (using readily available potassium compounds) and low emissions (converting all carbon to useful products), thereby resolving the contradiction between ease of manufacture and environmental impact.
Solution Approach 2:
The patent employs strong chemical reactions involving potassium hydroxide and carbon dioxide to rapidly convert emissions into valuable products. This accelerated chemical transformation ensures complete utilization of carbon emissions, maintaining economic viability while eliminating harmful releases to the environment.
3Object-generated harmful factors
If carbon dioxide is captured and sequestered, then life cycle emissions are reduced, but process complexity increases
Solution Approach 1:
The patent implements a multi-functional system where the carbon capture unit also serves as a potassium production unit. The potassium carbonate formed from carbon capture is further processed to produce potassium metal, which can be used in various industrial applications. This multi-functionality reduces overall process complexity by combining carbon management with valuable product production, rather than requiring separate capture and disposal systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process achieves a carbon life cycle emission of less than 1.5 Kg CO2e per Kg of hydrogen, significantly lowering the environmental impact compared to conventional methods.
Implementation Method 1
Partial oxidation involves reacting light hydrocarbons with oxygen to produce hydrogen, carbon monoxide, carbon dioxide, and water. In partial oxidation, a limited amount of oxygen is allowed to react with the hydrocarbon, for example methane, such that the oxygen supplied is insufficient to fully oxidize the methane to carbon dioxide and water; instead, the methane is partially oxidized to form hydrogen and carbon monoxide.
Implementation Method 2
The produced carbon monoxide is then reacted with steam in a water-gas shift reaction to produce more hydrogen.
Implementation Method 3
removing carbon dioxide from the absorber feed, in an absorber unit, to produce (1) a hydrogen product stream comprising 88 to 100 mole percent hydrogen and less than 0.6 mole percent carbon monoxide and (2) a carbon dioxide product stream comprising 85 to 100 mole percent carbon dioxide
Data Source
AI summary
A method of producing hydrogen from methane and renewable hydrocarbons is disclosed. The method includes producing hydrogen with a lower carbon life cycle emission score by utilizing (1) a blend of renewable feedstocks and natural gas and (2) a carbon dioxide recovery and sequestration process.