Monolithic Separation Membrane With Low Helium Permeation Resistance
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Solution Overview
Problem
Existing monolithic separation membrane structures face challenges in enhancing water flux, particularly when the substrate has a monolithic configuration and is subjected to penetrative vaporization separation at reduced pressure, as they struggle to effectively increase water flux despite adjustments in filtration cell and water collecting cell dimensions and N2 gas permeability.
Innovation Solution
A monolithic separation membrane structure with a support body made of porous material, featuring a tubular configuration with specific seal portions and closure members, where the helium gas permeation resistance is less than 8.3×10^7 Pa·sec/m², enhancing water flux through optimized pore structure and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dimensions of filtration cell and water collecting cell are adjusted, then water flux is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention changes the key parameter from cell dimensions to helium gas permeation resistance of the support body. By controlling the permeation resistance (≤8.3×10^7 Pa·sec/m²) through material selection and pore structure optimization, water flux enhancement is achieved without requiring precise dimensional control of the filtration and water collecting cells, thus resolving the contradiction between productivity improvement and manufacturing precision requirements
Solution Approach 2:
The invention utilizes porous materials for the support body with specifically controlled pore structures. The porous structure's helium gas permeation resistance is optimized to enhance water flux while being more tolerant to manufacturing variations compared to precise dimensional specifications, thereby addressing the technical contradiction
2Productivity
If N2 gas permeability is adjusted to increase water flux, then water flux is improved, but effectiveness under reduced pressure conditions deteriorates
Solution Approach 1:
The invention changes the gas type parameter from N2 to helium for permeation resistance measurement, and more importantly, changes the controlling parameter from N2 permeability to helium permeation resistance with a specific threshold (≤8.3×10^7 Pa·sec/m²). This parameter change ensures effective water flux enhancement under reduced pressure conditions by optimizing the support body's intrinsic permeation properties rather than relying on gas-specific permeability adjustments
Solution Approach 2:
The invention uses helium gas as a test medium for determining permeation resistance, leveraging helium's properties (small molecular size, high diffusivity) to accurately characterize the support body's permeation characteristics. This approach provides reliable performance prediction under reduced pressure conditions without requiring complex testing procedures
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 structure significantly increases water flux by reducing helium gas permeation resistance, allowing for improved water vapor transmission rates, even under reduced pressure conditions, by adjusting the support body's porosity and pore size distribution.
Implementation Method 1
The support body is configured by a porous material. A plurality of first through holes and a plurality of second through holes are formed in the support body. The helium gas permeation resistance in the support body is less than 8.3×10^7 Pa·sec/m2.
Implementation Method 2
optimized pore structure and porosity
Implementation Method 3
The separation membrane is a gas separation membrane used in relation to a method of penetrative vaporization or a method of vapor infiltration
Data Source
AI summary
A monolithic separation membrane structure comprises a support body and a separation membrane. The support body is composed of a porous material and includes a plurality of through holes. The separation membrane is formed in a tubular shape on an inner side of the plurality of through holes, and is used in a penetrative vaporization method or a vapor infiltration method. The helium gas permeation resistance in the support body is less than 8.3×107 Pa·sec/m2.