Siloxane Membrane Crosslinked with Metal Atoms for CO2 Separation
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Solution Overview
Problem
Current polymer membranes lack high selective permeability to carbon dioxide while maintaining gas permeability, and existing methods for carbon dioxide recovery from exhaust gases are energy and cost-intensive.
Innovation Solution
A gas-permeable membrane is developed using a composition with a siloxane chain and metal atoms like titanium or zirconium, which crosslink to form a polymer membrane with enhanced selectivity and permeability to carbon dioxide, achieved through a heat-treatment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polymer membranes are used for gas separation, then the membrane structure is simple and easy to manufacture, but the selective permeability to carbon dioxide is insufficient
Solution Approach 1:
The patent uses composite materials by combining siloxane polymer chains with metal atoms (titanium, zirconium, or hafnium) to form a crosslinked structure. This composite approach enhances carbon dioxide selectivity while maintaining membrane integrity, resolving the contradiction between simple structure and high selective permeability.
Solution Approach 2:
The patent changes the chemical parameters of the membrane by introducing metal atoms with specific properties (titanium, zirconium, or hafnium) into the siloxane polymer matrix. This parameter change transforms the membrane's gas separation properties, achieving high carbon dioxide selectivity through controlled chemical composition modification.
2Reliability
If polymer membranes with high carbon dioxide selectivity are developed, then gas separation performance improves, but the manufacturing process becomes more complex requiring metal compounds and heat treatment
Solution Approach 1:
The patent incorporates metal compounds into the polymer composition before membrane formation. This preliminary action allows the metal atoms to be uniformly distributed in the polymer matrix before crosslinking, simplifying the overall manufacturing process while achieving high gas separation performance through the subsequent heat treatment step.
Solution Approach 2:
The patent uses heat treatment to change the physical and chemical parameters of the membrane, transforming the metal compound-polymer mixture into a crosslinked structure with enhanced gas separation performance. This controlled parameter change achieves high selectivity through a manageable manufacturing process.
3Reliability
If metal compounds are added to enhance carbon dioxide permeability, then gas permeability and selectivity improve, but the composition complexity and processing requirements increase
Solution Approach 1:
The patent carefully controls the metal compound content parameter (5-20 mass% as metal oxide) to optimize carbon dioxide permeability and selectivity. This controlled parameter change achieves high gas separation performance while managing composition complexity through defined concentration ranges.
Solution Approach 2:
The patent introduces metal atoms at specific locations within the siloxane polymer matrix to create localized regions of enhanced carbon dioxide interaction. This local quality approach improves permeability and selectivity without requiring uniform distribution of complex components throughout the entire membrane structure.
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 exhibits improved selectivity and permeability to carbon dioxide, outperforming traditional polymer membranes in gas separation, with increased mechanical strength and smooth phase transition, suitable for efficient carbon dioxide recovery.
Implementation Method 1
a gas-permeable membrane having a partial structure represented by general formula (I), wherein in general formula (I), R 1
Implementation Method 2
having a functional group capable of generating at least two hydroxyl groups per one molecule of the compound by hydrolysis
Implementation Method 3
a process for producing the gas-permeable membrane in which the composition for forming the gas-permeable membrane is heat-treated to produce a polymer membrane
Data Source
AI summary
The present invention provides a gas-permeable membrane comprising a partial structure represented by formula (I) or formula (II), wherein R1 and R2 each independently represents a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkenyloxy group having 2 to 6 carbon atoms, an aryl group or an aryloxy group, M1, M2 and M3 each independently represents a metal atom, ml represents an integer, n1, n2 and n3 each independently represents an integer of 1 to 3, * represents a bonding hand, a composition for forming the gas-permeable membrane and a production process of the gas-permeable membrane.