Microstructured Flow Reactor Wall for Heat Transfer
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Solution Overview
Problem
Conventional flow reactors experience reduced reaction rates due to inefficient heat transfer within the catalyst bed, primarily through convective processes at point-like contacts between grains, leading to insufficient output.
Innovation Solution
A flow reactor with a wall containing microstructuring, produced by laser radiation, which increases the surface area and allows for improved heat supply or dissipation, enhancing the reaction rate by creating a larger three-phase boundary while maintaining a compact design. The microstructuring can be catalytically active and is applied with catalysts like platinum or palladium, optimizing catalyst usage and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bulk or bed of granular catalyst is used in a tubular reactor, then the reactor can be operated continuously with liquid reactant flow, but the heat transfer within the catalyst bed is inefficient due to point-like contacts between grains, reducing the reaction rate
Solution Approach 1:
The patent applies porous ceramic foam structures as catalyst carriers, which provide continuous thermal pathways through their porous network while maintaining high surface area for catalytic reactions. This resolves the heat transfer inefficiency of granular beds by creating interconnected heat conduction paths while preserving catalytic activity.
Solution Approach 2:
The patent uses composite structures combining ceramic foam substrates with catalytically active coatings or impregnated materials. This composite approach allows the ceramic foam to provide thermal management through its porous structure while the catalytic layer enables chemical reactions, simultaneously addressing both heat transfer and reaction rate requirements.
2Productivity
If the channel is closed on all sides forming a sealed container, then the reactor can operate discontinuously with controlled reactant amounts, but the heat supply or dissipation to the catalytically active surface is less efficient compared to open structures
Solution Approach 1:
The patent applies different thermal management strategies to different regions of the reactor. The wall structure incorporates thermal management features specifically at locations where catalytically active surfaces are present, providing enhanced heat supply or dissipation locally where needed most, while maintaining sealed container benefits elsewhere.
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 reactor achieves significantly higher reaction rates, with hydrogen release rates exceeding previous limits, and efficient heat management, allowing for compact and efficient chemical processing.
Implementation Method 1
the microstructuring leads to an increase in the surface area
Implementation Method 2
the heat supply or heat dissipation to the catalytically active surface can be improved
Implementation Method 3
the microstructuring can be produced by laser radiation, which during a manufacturing step acts at least on a sub-area of the inner side and/or the outer side of the wall
Implementation Method 4
the surface-enlarged planar elements can either have a catalytic effect themselves or be provided with catalytically active substances
Data Source
AI summary
The invention relates to a continuous flow reactor having a wall which delimits a channel, wherein at least one sub-area is arranged in the channel that has microstructuring which includes individual structures, the diameter of which on a base is between about 10 μm to about 100 μm. The invention further relates to methods for reacting a gaseous or liquid educt under the action of a catalyst.