Gas Separation Membrane with Dual-Layer Structure for BTX Resistance
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Solution Overview
Problem
Conventional gas separation membranes with fluorine atoms suffer from decreased gas separation selectivity when exposed to impurity gases such as BTX and higher order hydrocarbon gases, leading to performance deterioration.
Innovation Solution
A gas separation membrane configuration featuring a first separation layer with a low Si/C ratio and a second separation layer with a high F/C ratio, where the second layer is laminated on top to suppress plasticization and maintain selectivity, comprising a fluoro(meth)acrylate polymer or fluoroolefin polymer with specific bonds and a protective layer for enhanced durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine-containing polymer membrane is used for gas separation, then gas separation selectivity is improved, but the membrane performance deteriorates when exposed to impurity gases such as BTX and higher order hydrocarbon gases due to plasticization
Solution Approach 1:
The membrane is divided into multiple functional layers: a first separation layer made of fluorine-containing polymer for high gas separation selectivity, and a second separation layer made of plasticization-resistant polymer to prevent performance deterioration from impurity gases. This segmentation allows each layer to perform its specific function independently.
Solution Approach 2:
The invention uses a composite membrane structure combining two different polymer materials with complementary properties: the fluorine-containing polymer provides high CO2 permeability and separation selectivity, while the plasticization-resistant polymer maintains structural stability and prevents performance degradation when exposed to hydrocarbon gases.
2Productivity
If the fluorine-containing polymer layer is made thinner to improve CO2 permeability, then gas permeability is improved, but the membrane becomes more susceptible to plasticization by impurity gases
Solution Approach 1:
The membrane is divided into multiple functional layers: a first separation layer made of fluorine-containing polymer for high gas separation selectivity, and a second separation layer made of plasticization-resistant polymer to prevent performance deterioration from impurity gases. This segmentation allows each layer to perform its specific function independently.
Solution Approach 2:
The invention uses a composite membrane structure combining two different polymer materials with complementary properties: the fluorine-containing polymer provides high CO2 permeability and separation selectivity, while the plasticization-resistant polymer maintains structural stability and prevents performance degradation when exposed to hydrocarbon gases.
3Device complexity
If a single-layer membrane structure is used to simplify the membrane configuration, then device complexity is reduced, but the membrane cannot maintain high selectivity and resistance to impurity gases simultaneously
Solution Approach 1:
The membrane is divided into multiple functional layers: a first separation layer made of fluorine-containing polymer for high gas separation selectivity, and a second separation layer made of plasticization-resistant polymer to prevent performance deterioration from impurity gases. This segmentation allows each layer to perform its specific function independently.
Solution Approach 2:
The invention uses a composite membrane structure combining two different polymer materials with complementary properties: the fluorine-containing polymer provides high CO2 permeability and separation selectivity, while the plasticization-resistant polymer maintains structural stability and prevents performance degradation when exposed to hydrocarbon gases.
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 high gas separation selectivity and resistance to impurity gases, maintaining performance even when exposed to BTX and other hydrocarbon gases, with improved rub resistance and CO2 permeability.
Implementation Method 1
A material formed of a polymer compound has a gas permeability specific to the material. Based on this property, it is possible to cause selective permeation and separation of a target gas component using a membrane formed of a specific polymer compound.
Data Source
AI summary
A gas separation membrane, the gas separation membrane module, and the gas separation device include a first separation layer, and a second separation layer, the first separation layer has an Si/C ratio of 0.3 or less, the Si/C ratio being a ratio of the number of silicon atoms to the number of carbon atoms at the interface of the first separation layer on the second separation layer side, the second separation layer has a maximum value of an F/C ratio of 0.20 or more, the F/C ratio being a ratio of the number of fluorine atoms to the number of carbon atoms, and an Si/C ratio of 0.3 or less in a portion where the F/C ratio is maximum.