CO2-Selective Membrane Structure for CO2 and CO Separation
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Solution Overview
Problem
Existing fuel cell systems require improved membranes for efficient gas separation, particularly for separating CO2 and CO, to enhance their operational efficiency and effectiveness.
Innovation Solution
Development of CO2-selective membranes comprising a support layer and a selective polymer layer with a hydrophilic polymer matrix and amine-containing carrier, which exhibit high CO2:CO selectivity and permeability, allowing for the separation of CO2 and CO from a feed gas stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional membranes are used for gas separation in fuel cells, then the system structure is simple, but the CO2:CO selectivity is insufficient
Solution Approach 1:
The patent employs composite membrane structures combining multiple functional layers: a selective polymer layer containing amine carriers for CO2 separation, a support layer for mechanical strength, and potentially a protective layer. This composite approach achieves high CO2:CO selectivity (exceeding 1000:1) while maintaining structural integrity and operational feasibility in fuel cell systems
Solution Approach 2:
The patent utilizes parameter changes by controlling the operational temperature range (60-180°C) to optimize the selectivity and permeability characteristics of the CO2-selective membrane. The amine-containing carrier's affinity for CO2 is temperature-dependent, allowing enhanced separation performance within this specific temperature window
2Quantity of substance
If existing membranes are used, then the operational complexity is low, but the CO2 permeability is insufficient
Solution Approach 1:
The patent incorporates porous structures within the membrane layers, particularly in the support layer and selective polymer layer, to facilitate efficient gas transport. The porous architecture provides pathways for CO2 diffusion while the amine-containing carriers selectively bind and transport CO2 molecules, achieving high permeability rates
Solution Approach 2:
The amine-containing carrier acts as an intermediary substance that selectively interacts with CO2 molecules. The amine groups form reversible carbamate bonds with CO2, enabling selective transport through the membrane while excluding CO and other gases, thereby achieving high CO2 permeability with controlled membrane composition
3Productivity
If high-selectivity membranes are implemented, then gas separation efficiency improves, but the system complexity increases
Solution Approach 1:
The CO2-selective membrane serves multiple functions simultaneously: it acts as a separation barrier for CO2:CO gas separation, provides structural support through its layered architecture, and enables selective gas transport through its porous structure and amine carrier mechanism. This multi-functionality reduces the need for additional separate components, thereby limiting system complexity growth
Solution Approach 2:
The membrane system is segmented into distinct functional layers: a selective polymer layer containing amine carriers for CO2 separation, a porous support layer for mechanical strength and gas transport pathways, and potentially a protective layer. This segmentation allows each layer to be optimized for its specific function while working together to achieve high overall separation efficiency
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 membranes achieve high-purity CO2 and CO gas streams, enabling efficient CO2 to CO conversion, thereby enhancing the performance of solid oxide fuel cell systems.
Implementation Method 1
The selective polymer layer can comprise a hydrophilic polymer matrix and an amine-containing carrier dispersed therein. The CO2-selective membrane can exhibit a CO2:CO selectivity of at least 500 at 100° C. and 2 atm feed pressure.
Implementation Method 2
The membranes can be used to produce high-purity CO2 and CO gas streams from a feed gas stream comprising a mixture of CO2 and CO (e.g., an exhaust gas stream from a fuel cell).
Data Source
AI summary
Provided herein are CO2-selective membranes that can be used to efficiently separate CO2 and CO. The membranes can be used to produce high-purity CO2 and CO gas streams from a feed gas stream comprising a mixture of CO2 and CO (e.g., an exhaust gas stream from a fuel cell, such as a solid oxide fuel cell). In this way, the membranes can be used with a solid oxide fuel cell system to covert CO2 to CO.