Thin-Film Composite Membrane for Aromatic-Alkane Separation
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Solution Overview
Problem
Traditional methods for separating aromatic compounds from alkanes, such as distillation, are energy-intensive and costly due to similar boiling points, and existing membrane technologies face challenges with mechanical durability and defect-free fabrication, especially for complex geometries.
Innovation Solution
A thin-film composite membrane with a predominantly laminar separation layer made from an ionomer solution free of dissolved ionic species, using a substrate with a porous-layer support, which enhances mechanical strength and defect-free formation, allowing for efficient separation of aromatic compounds from alkanes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick membrane is used to ensure mechanical strength, then durability is improved, but flux becomes impractically low
Solution Approach 1:
The membrane is segmented into multiple functional layers: a thin separation layer (0.1-10 μm) for high flux and selectivity, and a thicker support layer for mechanical strength. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The invention uses a composite membrane structure combining a thin separation layer made from fluorinated ionomer with a porous support layer. The composite construction integrates the advantages of both materials: the ionomer provides high selectivity and flux, while the porous support provides mechanical durability.
2Reliability
If traditional distillation methods are used for separation, then separation capability is achieved, but energy consumption increases
Solution Approach 1:
The invention replaces the thermal field-based distillation process with a membrane-based separation process that operates at ambient conditions. The fluorinated ionomer membrane provides selective transport of aromatic compounds through facilitated transport mechanisms, eliminating the need for high-energy thermal processing.
Solution Approach 2:
The invention changes the separation mechanism from thermal diffusion (distillation) to selective permeation through fluorinated ionomer membranes. This parameter change enables separation at ambient temperature and pressure, dramatically reducing energy consumption while maintaining high separation capability.
3Productivity
If a thin separation layer is used to increase flux, then productivity is improved, but mechanical durability deteriorates
Solution Approach 1:
The membrane structure is segmented into a thin separation layer (0.1-10 μm) bonded to a thicker porous support layer. The support layer serves as a mechanical backbone that provides durability, while the thin separation layer maintains high flux and selectivity.
Solution Approach 2:
The composite membrane combines a thin fluorinated ionomer separation layer with a porous support layer. This composite construction allows the thin layer to provide high flux without sacrificing mechanical durability, as the support layer bears the mechanical loads.
4Adaptability or versatility
If complex geometries like spiral-wound modules are fabricated, then adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The thin-film composite membrane structure (with separation layer 0.1-10 μm thick) is inherently flexible and can be conformally wrapped around spacers and cores to create spiral-wound modules and other complex geometries. The thin film nature allows easy forming without cracking or delamination.
Solution Approach 2:
The membrane is prepared as a thin-film composite structure beforehand, which then serves as a pre-fabricated component that can be easily assembled into various module configurations. This preliminary preparation simplifies subsequent module assembly and enables versatile geometry creation.
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 membrane achieves higher selectivity and permeance with reduced helium permeability, enabling the separation of alkenes and aromatic compounds like benzene from alkanes, and can be fabricated into complex geometries like spiral-wound modules with improved durability and reduced energy consumption.
Implementation Method 1
Thin-film composite membranes that incorporate ionomers may be used for facilitated transport of alkenes or aromatic compounds
Implementation Method 2
a substrate comprising a porous-layer support
Data Source
AI summary
This invention discloses a method for separation of an aromatic compound from a mixture comprising an alkane using an improved thin-film composite membrane. The membrane is particularly useful for separation of benzene from cyclohexane, which have similar boiling points. The membrane comprises a more mechanically durable and defect-free separation layer as a result of its fabrication from an ionomer solution that is substantially free of dissolved ionic species not associated with the ionomer.