Superabsorbent Nanofiber Web for Aviation Fuel Filtration
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Solution Overview
Problem
Existing filtration media face challenges in maintaining mechanical stability and efficiency due to the dislodgment of particulates and limited active material loading, particularly in removing soluble and insoluble contaminants from fluid phases, including gases and liquids.
Innovation Solution
A web or filter structure comprising a continuous nanofiber layer with superabsorbent particulates or fibers, which can be used in flow-through or flow-by modes to absorb, adsorb, or react with contaminants, eliminating the need for PTFE or other porous fluoropolymers and providing enhanced filtration efficiency and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If surface loading filter media with dense fiber mats are used, then particulate removal efficiency is improved, but the filter accumulates particulate on the surface leading to increased pressure drop and reduced lifetime
Solution Approach 1:
The patent transitions from surface loading filtration (2D surface accumulation) to depth media filtration (3D distributed accumulation). Particulates are removed and distributed throughout the volume of the filter medium rather than accumulating on the surface, enabling extended filter lifetime while maintaining removal efficiency.
Solution Approach 2:
The patent employs porous depth media with controlled porosity and gradient density structures. The porous architecture allows fluid flow while distributing particulate accumulation throughout the media volume, preventing surface clogging and extending operational lifetime.
2Measurement precision
If depth media with thick fiber structures are used, then particulate distribution throughout the filter volume is improved, but the pressure drop across the filter increases
Solution Approach 1:
The patent employs gradient density depth media where fiber density and porosity vary through the thickness of the media. Regions with different local properties are optimized for different functions: higher density regions for particulate capture, lower density regions for maintaining fluid flow and reducing pressure drop.
Solution Approach 2:
The patent optimizes multiple parameters including fiber diameter, porosity, layer thickness, and density gradients to balance particulate removal efficiency with acceptable pressure drop. By adjusting these parameters, the filter achieves deep particulate distribution without excessive pressure loss.
3Quantity of substance
If super absorbent particulate is added to fiber web, then absorption and reaction capacity with contaminants is improved, but mechanical stability may be reduced due to particulate dislodgment
Solution Approach 1:
The patent combines super absorbent particulate with the fiber web structure to create a composite filtration medium. The particulate is integrated within the fiber matrix, merging the mechanical stability of the fiber web with the high absorption capacity of the super absorbent material, preventing particulate dislodgment while maintaining reliability.
Solution Approach 2:
The patent creates a composite structure combining fiber materials with super absorbent particulate. This composite approach leverages the strengths of both components: the structural integrity of fibers and the contaminant absorption capacity of super absorbent materials, achieving both high active material loading and mechanical stability.
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 effectively removes contaminants from fluid streams by absorbing or reacting with them, offering improved filtration efficiency and extended operational life without mechanical failure, particularly effective in aviation fuel applications where water contamination is a concern.
Implementation Method 1
The water absorbing capacity of the SAP is at least about 0.5 g water/g SAP, and more preferably at least about 1.0 g water/g SAP... the SAP swells upon contact with water, forming a gel structure that blocks flow paths
Implementation Method 2
The web, filter, or other flow-through or flow-by structure of the invention can comprise a substantially continuous nanofiber mass and a layer containing the super absorbent particulate, fiber or fabric
Data Source
AI summary
The web of the invention can comprise a super absorbent layer that can act as an moisture sensitive fuel shut-off valve, absorbent, adsorbant or reactant. The web of the invention can comprise a super absorbent fabric or layer made of a superabsorbent particle or fiber. Fluid, gas or liquid, that flows through or by the assemblies of the invention can have any gas, liquid or solid material dispersed or dissolved in the fluid interact with the super absorbent particulate. The structures of the invention can act simply as flow-by reactive, absorptive, or adsorptive layers with no filtration properties, or the structures of the invention can be assembled into filters.