Zeolite Nanosheet Membrane for Oxygen Nitrogen Separation
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Solution Overview
Problem
Current membrane technologies for separating nitrogen and oxygen from air face limitations in selectivity and permeability, often resulting in performance specifications that are not stable across varying conditions and fail to meet payload weight and size requirements, particularly in applications like aircraft fuel tank suppression systems.
Innovation Solution
A membrane device comprising a polymer support coated with zeolite nanosheet particles, which creates a pressure differential to preferentially diffuse oxygen over nitrogen, enhancing the separation efficiency and achieving high nitrogen and oxygen enrichment levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polymer composite materials are used as membranes for gas separation, then mechanical limitations are overcome, but selectivity and permeability performance does not reach the Robeson limit
Solution Approach 1:
The patent uses zeolite nanosheet particles with controlled porosity and pore sizes (0.3-0.5 nm) to create selective pathways for gas molecules. The porous structure allows oxygen molecules to pass through while blocking nitrogen molecules, achieving high selectivity that meets or exceeds the Robeson limit while maintaining mechanical integrity through the polymer support matrix.
Solution Approach 2:
The patent creates a composite membrane structure combining a polymer support matrix with dispersed zeolite nanosheet particles. This composite approach integrates the mechanical strength of polymers with the high selectivity of zeolite materials, resolving the contradiction between mechanical properties and separation performance by synergistically combining two different materials.
2Manufacturing precision
If high-selectivity materials are incorporated into polymer matrix, then selectivity is improved, but overall permeability is limited
Solution Approach 1:
The patent applies local quality by creating distinct regions within the membrane: the polymer matrix provides mechanical support while the dispersed zeolite nanosheet particles create localized high-selectivity pathways. This local differentiation allows the membrane to achieve both high selectivity at the particle interfaces and adequate permeability through the polymer regions.
Solution Approach 2:
The patent optimizes parameters including zeolite nanosheet particle size (50-5000 nm), concentration (5-50 wt%), and distribution within the polymer matrix to balance selectivity and permeability. By carefully controlling these parameters, the membrane achieves optimal performance where high-selectivity materials enhance separation without excessively limiting overall gas flux.
3Manufacturing precision
If inorganic metal oxide materials are used as membranes, then separation performance is improved, but mechanical brittleness and fabrication difficulty increase
Solution Approach 1:
The patent uses a polymer matrix as an intermediary material that combines with inorganic zeolite nanosheet particles. The polymer acts as a binder and support structure, enabling the fabrication of flexible, durable membranes while maintaining the high separation performance of the inorganic zeolite component, thus resolving the contradiction between performance and ease of manufacture.
Solution Approach 2:
The patent employs thin polymer films as flexible supports for the zeolite nanosheet particles, creating membranes that are both mechanically robust and easy to fabricate. This flexible thin-film approach replaces traditional rigid inorganic membrane structures, enabling simpler manufacturing processes while maintaining high separation performance through the zeolite component.
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 use of zeolite nanosheet particles in a polymer support membrane enables the production of nitrogen-enriched air with at least 90% nitrogen and oxygen-enriched air with at least 25% oxygen, surpassing traditional membrane limitations by maintaining performance across a wide range of conditions while minimizing payload weight and size.
Implementation Method 1
The delivered air provides a pressure differential between opposite sides of the membrane, thus causing oxygen to diffuse through the polymer support and the layer comprising zeolite nanosheet particles to a second side of the membrane. This preferential diffusion of oxygen (compared to the diffusion of nitrogen) through the membrane produces nitrogen-enriched air on the first side of the membrane and oxygen-enriched air on the second side of the membrane.
Data Source
Figure 1~2
Figure 3
AI summary
A method of separating oxygen from nitrogen involves delivering air to a first side of a membrane (10) comprising a polymer support (12) and a layer (14) of zeolite nanosheet particles with thickness of 2 nm to 10 nm and mean diameter of 5 nm to 5000 nm. The delivered air provides a pressure differential between opposite sides of the membrane (10), thus causing oxygen in the hollow core to diffuse through the polymer support (12) and the zeolite nanosheet layer (14) to the second side of the membrane (10). The preferential diffusion of oxygen (compared to diffusion of nitrogen) through the membrane produces nitrogen-enriched air on the first side of the membrane (10) and oxygen-enriched air on the second side of the membrane (20).