Hydrogen and Ammonia Production With Integrated PSA and CO2 Separation
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Solution Overview
Problem
The Haber-Bosch process for ammonia production is energy-intensive, and conventional hydrogen production methods release significant carbon dioxide into the atmosphere, necessitating more efficient and environmentally friendly processes.
Innovation Solution
A process that includes autothermal reforming or partial oxidation without prior endothermic reforming, combined with pressure swing adsorption and carbon dioxide separation, allowing for thermal and material recycling, and eliminating the need for complex intermediate compression and downstream separation steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional steam reforming or partial oxidation is used for hydrogen production, then hydrogen can be produced, but carbon dioxide is released into the atmosphere
Solution Approach 1:
The patent converts the harmful carbon dioxide byproduct into a valuable resource by implementing a water-gas shift reaction that transforms CO and CO2 into additional hydrogen and concentrated CO2 streams. The CO2 is then separated and purified for potential utilization or sequestration, turning an environmental liability into a benefit.
Solution Approach 2:
The patent changes the chemical parameters of the synthesis gas through the water-gas shift reaction, converting carbon monoxide and carbon dioxide into hydrogen and water vapor. This parameter change increases hydrogen concentration and creates a CO2-rich stream that can be easily separated and utilized.
2Quantity of substance
If the water gas shift reaction is used to increase hydrogen yield, then hydrogen concentration increases, but carbon dioxide concentration also increases requiring separation
Solution Approach 1:
The patent extracts carbon dioxide from the synthesis gas stream using a dedicated CO2 separation unit positioned after the water-gas shift reaction. This extraction creates a purified hydrogen stream for ammonia synthesis while concentrating CO2 for separate handling, utilization, or sequestration.
Solution Approach 2:
The patent introduces a CO2 separation unit as an intermediary component between the water-gas shift reaction and the ammonia synthesis process. This intermediary device mediates the separation of CO2 from hydrogen, allowing both streams to be optimized for their respective purposes without interference.
3Quantity of substance
If conventional ammonia production processes are used, then ammonia can be produced, but energy consumption is extremely high
Solution Approach 1:
The patent implements continuous hydrogen production through the integrated water-gas shift reaction and CO2 separation process, ensuring a steady supply of high-purity hydrogen to the ammonia synthesis unit. This continuous operation eliminates interruptions and optimizes energy utilization throughout the process chain.
Solution Approach 2:
The patent optimizes the hydrogen-to-nitrogen ratio and purity parameters through the water-gas shift reaction and CO2 separation, creating ideal conditions for ammonia synthesis. These parameter changes enable more efficient ammonia production with reduced energy requirements compared to conventional processes.
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
Reduces energy consumption and minimizes carbon dioxide emissions by optimizing hydrogen and ammonia production, enhancing hydrogen yield and enabling carbon dioxide sequestration.
Implementation Method 1
providing a first hydrogen stream from hydrogen in the second synthesis gas stream and by means of a first pressure swing adsorption unit
Implementation Method 2
providing the first synthesis gas stream using autothermal reforming or partial oxidation without prior endothermic reforming
Implementation Method 3
providing the second synthesis gas stream for the conversion of carbon monoxide to carbon dioxide and hydrogen using a water gas shift reaction
Data Source
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AI summary
A process for producing hydrogen and/or ammonia is proposed, comprising the following steps: providing a first synthesis gas stream comprising hydrogen, carbon monoxide and carbon dioxide, providing a second synthesis gas stream which is enriched in hydrogen and carbon dioxide and depleted in carbon monoxide compared to the first synthesis gas stream (SG3), using the first synthesis gas stream or a portion thereof, providing a first hydrogen stream using hydrogen from the second synthesis gas stream and a first pressure swing adsorption unit, and providing a carbon dioxide stream using carbon dioxide from the second synthesis gas stream and by means of a carbon dioxide separation unit.The process comprises one or more of the following steps a) to c): a) providing the first synthesis gas stream using autothermal reforming or partial oxidation without prior endothermic reforming, b) providing the first hydrogen stream downstream of the provision of the carbon dioxide stream, and c) processing a first residual gas stream (RG2) remaining downstream of the provision of the first hydrogen stream and the carbon dioxide stream, or a portion thereof, to obtain a second hydrogen stream (HG2) and a second residual gas stream by means of a second pressure swing adsorption unit. A plant for carrying out the process is also proposed.