Crosslinked Hybrid Membrane for High-Pressure Gas Separation
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Solution Overview
Problem
Current gas separation membranes face challenges in achieving high gas permeability and selectivity while maintaining mechanical strength and stability under high-pressure conditions, particularly with impurities like toluene, and lack effective methods for practical membrane formation and durability.
Innovation Solution
A gas separation composite membrane is developed with a crosslinked organic-inorganic hybrid resin containing an oxanthrene unit, using a specific crosslinking chain and structural units, applied over a gas-permeable supporting layer, which enhances separation selectivity and stability under high-pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a membrane is made thinner to increase gas permeability, then gas permeability is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent employs a composite membrane structure consisting of a porous supporting layer and a gas-separating layer formed by coating a polymer solution containing crosslinkable functional groups. This composite structure allows the thin gas-separating layer to provide high gas permeability while the porous supporting layer maintains mechanical strength, resolving the contradiction between thinning the membrane and maintaining structural integrity.
Solution Approach 2:
The patent applies preliminary crosslinking treatment to the polymer chains in the gas-separating layer before the membrane is put into service. By introducing crosslinked structures in advance, the membrane gains enhanced mechanical strength and resistance to plasticization, allowing it to maintain both high permeability and strength even when made thin.
2Reliability
If crosslinked structure is introduced to suppress plasticization, then stability is improved, but gas permeability deteriorates
Solution Approach 1:
The patent applies crosslinked structures locally within the polymer chains rather than throughout the entire membrane structure. By controlling the degree and distribution of crosslinking, the membrane maintains sufficient free volume and chain mobility for gas permeation while gaining localized stability against plasticization from high CO2 concentrations and pressures.
Solution Approach 2:
The patent carefully controls the crosslinking parameters, including the type of crosslinkable functional groups, crosslinking density, and crosslinking conditions, to achieve an optimal balance. By adjusting these parameters, the membrane attains adequate stability to resist plasticization while preserving the necessary gas permeability for practical application.
3Manufacturing precision
If high crosslinking density is used to improve selectivity, then separation selectivity is improved, but gas permeability deteriorates
Solution Approach 1:
The patent optimizes crosslinking parameters including the selection of crosslinkable functional groups (carboxyl, hydroxyl, amino, mercapto groups), crosslinking agents, and crosslinking conditions to achieve an optimal crosslinking density. This controlled approach allows the membrane to attain high separation selectivity for CO2 while maintaining sufficient gas permeability by avoiding excessive crosslinking that would overly restrict chain mobility and free volume.
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 excellent gas permeability and selectivity, along with stability to plasticization-inducing impurities, and is suitable for high-pressure applications, providing a practical and durable gas separation solution.
Implementation Method 1
a raw material comprising a polymer compound has characteristic gas permeability for each raw material. Based on properties thereof, a desired gas component can be separated by allowing selective permeation by means of a membrane constituted of a specific polymer compound.
Data Source
AI summary
A gas separation composite membrane, containing a gas-permeable supporting layer and a gas separating layer containing a crosslinked organic-inorganic hybrid resin over the gas-permeable supporting layer, in which the crosslinked organic-inorganic hybrid resin has a structure in which a polymer incorporating therein an oxanthrene unit, or a polyimide compound has been crosslinked via a specific crosslinking chain.