Separation Membrane Complex with Controlled Dense Part Angle
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Solution Overview
Problem
The separation membrane complex experiences cracks near the boundary position due to stress from differential thermal expansion, leading to degradation of separation performance.
Innovation Solution
A separation membrane complex design where the dense part covers one surface of the porous support from a boundary position towards one side, with a zeolite membrane covering the support and dense part in the vicinity, ensuring a maximum evaluation angle of 5-45 degrees and controlled surface roughness to prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dense part and separation membrane are arranged with partial overlap at the boundary position, then the separation membrane can be supported and substances can be prevented from moving without permeating, but stress from differential thermal expansion causes cracks in the separation membrane at the boundary position
Solution Approach 1:
The invention changes the geometric parameters of the dense part by controlling the angle (α) between the dense part surface and the support surface to be within 0° to 45°. This parameter optimization reduces stress concentration at the boundary position, preventing cracks in the separation membrane while maintaining its support function and separation performance.
2Reliability
If the dense part is made thick to prevent substance leakage, then sealing performance improves, but the angle control becomes more difficult and stress concentration increases
Solution Approach 1:
The invention establishes a specific parameter range for the angle (α) between 0° to 45°, which balances sealing performance and manufacturability. This angle constraint allows the dense part to provide adequate sealing while maintaining a gradual transition that reduces stress concentration and is feasible to manufacture.
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 design effectively suppresses the occurrence of cracks and maintains separation performance by controlling the angle and roughness of the dense part, ensuring the zeolite membrane's integrity and separation efficiency.
Implementation Method 1
In order to prevent a substance from moving from a supply-side space to a permeate-side space without permeating the separation membrane, provided is a dense part on part of a surface of the support
Implementation Method 2
a substance with high permeability out of a supplied mixed substance selectively permeates the separation membrane
Implementation Method 3
a zeolite membrane covering the support and dense part in the vicinity
Data Source
AI summary
A separation membrane complex includes a porous support, a dense part covering one surface of the support from a boundary position toward one side in a predetermined direction on the surface, and a separation membrane covering the surface from the boundary position toward the other side and covering the dense part in the vicinity of the boundary position. In a case where, in a cross section, within a specified range from the boundary position toward the one side in the predetermined direction up to 30 μm, a maximum angle among angles formed of the surface and lines connecting respective positions on a surface of the dense part on a side of the separation membrane and the boundary position is acquired as an evaluation angle, a maximum value of four evaluation angles at four measurement positions is not smaller than 5 degrees and not larger than 45 degrees.