Three-Lobed Catalyst Body for Low Pressure Drop and High Stability
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Solution Overview
Problem
Existing catalyst bodies for heterogeneously catalyzed gas-phase reactions face challenges in achieving a balance between low pressure drop, efficient diffusion, high mechanical stability, and uniform packing density, particularly in confined reactor tubes, while maintaining high conversion and selectivity.
Innovation Solution
A shaped catalyst body with a cylindrical structure featuring three continuous holes, equidistantly arranged midpoints, uniform wall thicknesses, and outwardly curved covers, optimized for efficient diffusion, mechanical stability, and packing density, using elements from groups 3 to 12 of the Periodic Table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalyst bodies with complex geometric shapes (holes, grooves, notches, jags) are used, then catalyst activity and yield are improved, but mechanical stability and abrasion resistance deteriorate
Solution Approach 1:
The catalyst body is divided into multiple lobes (at least two lobes) with continuous holes running through them, creating segmented structures that enhance catalyst activity while maintaining mechanical integrity through the continuous hole design that prevents excessive fragmentation
Solution Approach 2:
The catalyst body employs outwardly curved covers and rounded lobe structures instead of sharp edges or flat surfaces, which reduces stress concentration points and improves abrasion resistance while maintaining the geometric complexity needed for high catalyst activity
2Productivity
If catalyst bodies with high surface area to volume ratio are used, then diffusion efficiency and reaction efficiency are improved, but pressure drop across the reactor increases
Solution Approach 1:
The catalyst body is segmented into multiple lobes with continuous holes running through them, creating multiple diffusion pathways that reduce the effective diffusion distance and enhance mass transfer efficiency while the overall compact structure prevents excessive pressure drop
Solution Approach 2:
Different regions of the catalyst body have optimized properties: the lobes provide high surface area for diffusion efficiency, while the continuous holes create low-resistance flow paths that reduce pressure drop, achieving local optimization of both diffusion and pressure characteristics
3Quantity of substance
If catalyst bodies with optimized geometric shapes are used, then packing density in confined reactor tubes is improved, but uniformity of packing and flow distribution deteriorates
Solution Approach 1:
The catalyst body employs asymmetric lobe configurations and non-uniform hole distributions that enable better interstitial packing in confined reactor tubes while the overall symmetric multi-lobe structure maintains uniform flow distribution through the bed
Solution Approach 2:
The outwardly curved covers and rounded lobe structures enable the catalyst bodies to pack more efficiently in confined spaces by reducing sharp corners and creating smoother contact surfaces, while maintaining uniform packing behavior through the consistent curved geometry
4Productivity
If catalyst bodies with continuous holes are used, then diffusion paths are shortened and efficiency is improved, but mechanical strength and structural integrity deteriorate
Solution Approach 1:
The continuous holes run through multiple lobes rather than through the entire catalyst body, segmenting the hole structure to maintain mechanical strength in the cover regions while still providing efficient diffusion pathways through the active catalyst zones
Solution Approach 2:
The outwardly curved covers and rounded hole edges eliminate sharp stress concentration points that would result from flat surfaces or sharp corners, significantly improving mechanical strength and structural integrity while maintaining the diffusion efficiency provided by the continuous holes
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 catalyst body achieves high conversion, selectivity, and long lifetime with low pressure drop and abrasion, facilitating easy production and effective use in confined reactor tubes.
Implementation Method 1
shaped catalyst body for heterogeneously catalyzed reactions of organic compounds in the gas-phase in fixed-bed reactors
Data Source
AI summary
A shaped catalyst body for heterogeneously catalyzed reactions of organic compounds in the gas-phase in fixed-bed reactors, containing an element from group 3 to 12 of the Periodic Table of the Elements, and having a three-lobed structure with a lateral surface around the lobes, a top cover and a bottom cover, as well as three continuous holes running from one cover side to the other cover side, wherein each hole is assigned to one lobe and wherein the cover sides have outwardly shaped arches, its production and a process for its use in the heterogeneously catalyzed reaction of an organic compound in the gas phase.