Polyimide Mixture Gas Separation Membrane
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Solution Overview
Problem
Current gas separation membranes have limited applications due to their restricted selectivity and permeability, necessitating the development of novel materials that can enhance gas separation efficiency.
Innovation Solution
A polyimide mixture incorporating an amino-containing silica particle, obtained through hydrolysis condensation of specific alkoxysilanes, is used to form a dense membrane suitable for gas separation, offering improved selectivity and permeability by adjusting the content of the amino-containing silica particle within a specific weight percentage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional polymer materials (cellulose acetate, polysulfone) are used for gas separation membranes, then the membrane can be manufactured with existing materials, but the selectivity and permeability are limited and application range is restricted
Solution Approach 1:
The patent applies composite materials by combining polyimide polymer with amino-containing silica particles to create a gas separation membrane that achieves both high selectivity and permeability. The composite structure allows the membrane to separate gases effectively while maintaining mechanical stability and chemical resistance, thereby expanding application range and improving reliability simultaneously.
2Reliability
If the membrane structure is made dense to improve gas separation performance, then selectivity and permeability improve, but manufacturing complexity and material processing difficulty increase
Solution Approach 1:
The patent utilizes parameter changes by controlling the content of amino-containing silica particles within a specific weight percentage range (3-30 wt%) to optimize the balance between membrane density and processability. By adjusting this parameter, the membrane achieves sufficient density for high gas separation performance while maintaining ease of manufacture through controlled material composition.
3Reliability
If amino-containing silica particles are added to polyimide to enhance gas separation capability, then selectivity and permeability improve, but the complexity of material composition and synthesis increases
Solution Approach 1:
The patent applies local quality by incorporating amino-containing silica particles specifically into the polyimide matrix at controlled concentrations (3-30 wt%). This localized addition of functional particles enhances gas separation capability at specific sites within the membrane structure without requiring complex overall material composition, thus improving reliability while managing complexity.
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 polyimide mixture enables effective separation of gases such as oxygen from nitrogen and carbon dioxide from nitrogen, maintaining good gas permeation and selectivity, while also providing a dense, stable membrane suitable for various industrial applications including carbon capture.
Implementation Method 1
The amino-containing silica particle is obtained by the hydrolysis condensation reaction of an alkoxysilane shown in formula 2 and an alkoxysilane shown in formula 3 in the presence of a catalyst
Implementation Method 2
The gas separation membrane selects gases mainly based on the difference of diffusion rates of those gases in the gas separation membrane
Data Source
AI summary
A polyimide mixture including a polyimide and an amino-containing silica particle is provided. The polyimide includes a repeating unit represented by formula 1:wherein Ar includesand A includesThe amino-containing silica particle is mixed with the polyimide, and is obtained by the hydrolysis condensation reaction of an alkoxysilane shown in formula 2 and an alkoxysilane shown in formula 3 in the presence of a catalyst:Si(OR1)4 formula 2,(NH2—Y)m—Si(OR2)4-m formula 3,wherein in formula 2, R1 is a C1-C10 alkyl group; andin formula 3, Y is a C1-C10 alkyl group or a C2-C10 alkenyl group, R2 is a C1-C10 alkyl group, and m is an integer of 1 to 3.