Synthesis Gas Production via Nanocarbon Segmentation
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Solution Overview
Problem
Existing methods for producing synthesis gas from lower hydrocarbons face challenges in achieving an optimal gas ratio of carbon monoxide and hydrogen, require complex optimization of reaction conditions, and result in inefficient system efficiency due to excessive hydrogen usage and by-product water production.
Innovation Solution
A method involving direct decomposition of lower hydrocarbons using a catalyst to produce hydrogen and nanocarbon, followed by reacting nanocarbon with carbon dioxide to produce carbon monoxide, and mixing the gases in a predetermined ratio to achieve a desired synthesis gas composition, while minimizing water production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional synthesis gas production methods combining multiple reactions (dry reforming, steam reforming, autothermal reaction) are used, then synthesis gas can be produced, but the operation becomes complicated and requires fine setting of reaction conditions to achieve optimal gas ratio
Solution Approach 1:
The invention separates the synthesis gas production into two independent steps: (1) lower hydrocarbon decomposition to produce hydrogen and nanocarbon, and (2) carbon dioxide reduction by nanocarbon to produce carbon monoxide. This segmentation allows independent control of each reaction, simplifying operation while maintaining optimal gas ratio. The nanocarbon produced in step 1 is directly used in step 2, creating a coupled but simplified process.
Solution Approach 2:
The lower hydrocarbon decomposition step preliminarily produces nanocarbon as an intermediate product, which is then used in the carbon dioxide reduction step. This preliminary action of generating nanocarbon in situ eliminates the need for external carbon sources and simplifies the overall process operation.
2Quantity of substance
If conventional methods are used to optimize synthesis gas ratio, then carbon monoxide and hydrogen can be produced in desired proportions, but separation and refinement of hydrogen and carbon monoxide are further necessary
Solution Approach 1:
By segmenting the production process into two distinct steps with different products (hydrogen in step 1, carbon monoxide in step 2), the invention naturally produces gases in the desired ratio without requiring post-production separation and refinement operations.
Solution Approach 2:
The nanocarbon produced in the first step automatically serves as the reducing agent in the second step, creating a self-balancing system that inherently produces the correct gas ratio without external intervention for separation or refinement.
3Quantity of substance
If conventional synthesis gas production is used, then carbon monoxide and hydrogen are produced, but water and carbon monoxide by-products must be removed and system efficiency decreases due to excessive hydrogen usage
Solution Approach 1:
The invention converts carbon dioxide, which would normally be a waste emission, into a useful reactant for carbon monoxide production. The nanocarbon that might be considered an unwanted by-product is instead utilized as the reducing agent. This transforms potential waste streams into valuable products, improving system efficiency and eliminating the need for water removal operations.
Solution Approach 2:
Instead of discarding carbon dioxide emissions and nanocarbon by-products, the invention recovers and utilizes them in the second reaction step, converting waste materials into valuable synthesis gas components and improving overall process efficiency.
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
This approach allows for easy adjustment of the hydrogen-to-carbon monoxide ratio and reduces waste hydrogen usage, enhancing system efficiency and simplifying the production process by eliminating unnecessary water production.
Implementation Method 1
a lower hydrocarbon decomposition step of directly decomposing lower hydrocarbon using a catalyst to produce hydrogen and nanocarbon
Implementation Method 2
a carbon dioxide reduction step of reacting a part of the nanocarbon produced in the lower hydrocarbon decomposition step in a state mixed with the catalyst with carbon dioxide in exhaust gas generated by combustion in a furnace
Implementation Method 3
a mixing step of mixing the hydrogen produced in the lower hydrocarbon decomposition step and the carbon monoxide produced in the carbon dioxide reduction step in a predetermined ratio to obtain a synthesis gas
Implementation Method 4
carbon dioxide in exhaust gas generated by combustion in a furnace in the lower hydrocarbon decomposition step
Data Source
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AI summary
A synthetic gas and nanocarbon production method has: a light hydrocarbon decomposition step in which light hydrocarbons are decomposed to generate a hydrogen and nanocarbon; a carbon dioxide reduction step in which some of the generated nanocarbons are reacted with carbon dioxide to produce carbon monoxide; and a mixing step in which the generated hydrogen and carbon monoxide are mixed at a predetermined ratio to obtain synthetic gas. These steps enable simultaneous and easy production of nanocarbon and synthetic gas having a desired gas ratio.