Composite Membrane Dehydration with Dioxole Polymer Coating
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Solution Overview
Problem
Membrane-based dehydration processes using water-selective membranes are ineffective for treating solutions with high water concentrations, as the selective layer swells and may dissolve or disintegrate, especially under hot conditions, limiting their application in industrial processes like biofuel production.
Innovation Solution
A composite membrane with a microporous support layer, a hydrophilic polymer layer, and a dioxole-based polymer layer is used, where the dioxole-based layer is positioned on top to provide higher selectivity for water over organic compounds, even at high water concentrations, maintaining stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If water-selective membranes with hydrophilic polymer layers are used for dehydration, then water removal efficiency is improved, but membrane stability deteriorates under high water concentration and hot conditions
Solution Approach 1:
The patent applies composite materials by combining a hydrophilic polymer layer (providing water selectivity) with a dioxole-based polymer layer (providing chemical stability). This composite structure allows the membrane to maintain both high water removal efficiency and stability under harsh conditions including high water concentrations and elevated temperatures, resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent implements local quality by assigning different functional properties to different layers of the membrane. The hydrophilic polymer layer is positioned to provide water selectivity where needed, while the dioxole-based polymer layer provides chemical resistance and structural stability in the same membrane system, allowing each layer to optimize its local function without compromising overall performance
2Manufacturing precision
If the selective layer is made denser to improve separation capability, then water selectivity is improved, but membrane resistance to swelling and dissolution worsens under prolonged water exposure
Solution Approach 1:
The patent uses composite materials to combine a dense hydrophilic polymer layer (providing high separation capability) with a dioxole-based polymer layer (providing resistance to swelling and dissolution). The composite structure allows the dense layer to achieve high water selectivity while the dioxole layer provides the necessary compositional stability under prolonged water exposure
Solution Approach 2:
The dioxole-based polymer layer acts as an intermediary that protects the hydrophilic polymer layer from direct contact with harsh feed solutions. This intermediary layer maintains the structural integrity of the dense selective layer, preventing swelling and dissolution while allowing the dense layer to maintain its high separation capability
3Productivity
If conventional water-selective membranes are used, then dehydration of low water concentration solutions is effective, but applicability to high water concentration solutions deteriorates
Solution Approach 1:
The patent applies composite materials by combining hydrophilic and dioxole-based polymers to create a membrane that maintains dehydration effectiveness across a wide range of water concentrations. The dioxole-based polymer component specifically enables the membrane to handle high water concentration solutions that would otherwise cause swelling and failure of conventional membranes, thereby improving adaptability
Solution Approach 2:
The patent implements parameter changes by modifying the chemical composition and structure of the selective layer to include dioxole-based polymers with specific molecular characteristics. This parameter change in the membrane material allows it to adapt to varying feed conditions, particularly high water concentrations and elevated temperatures, expanding its applicability range while maintaining dehydration effectiveness
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 composite membrane achieves higher selectivity and stability for water removal from solutions with high water concentrations, outperforming membranes with only hydrophilic or dioxole-based layers, enabling effective dehydration in industrial applications such as biofuel production.
Implementation Method 1
a second dense selective layer of a dioxole-based polymer... providing higher selectivity for water over organic compounds
Implementation Method 2
passing a feed solution comprising water and an organic compound across the feed side; withdrawing from the permeate side a permeate vapor
Implementation Method 3
the dioxole-based layer is positioned on top to provide higher selectivity... maintaining stability and performance
Data Source
AI summary
Processes for removing water from organic compounds, especially polar compounds such as alcohols. The processes include a membrane-based dehydration step, using a membrane that has a dioxole-based polymer selective layer or the like and a hydrophilic selective layer, and can operate even when the stream to be treated has a high water content, such as 10 wt % or more. The processes are particularly useful for dehydrating ethanol.