CTF Mixed Matrix Membranes for CO2 Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current membrane technologies for CO2 separation from natural gas face limitations due to the selectivity/permeability trade-off, known as Robeson's upper bound, and require innovative solutions to enhance CO2/CH4 selectivity and gas permeability while maintaining chemical and thermal stability.
Innovation Solution
The development of mixed matrix membranes (MMM) incorporating covalent triazine frameworks (CTFs) as porous fillers dispersed in a polymer matrix, specifically using substituted polynorbornenes or polytricyclononenes, which are synthesized through various pathways to optimize CO2 selectivity and permeability, and are compatible with the polymer matrix to prevent interfacial defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pure polymer membranes are used for CO2 separation, then the membrane structure is simple and easy to manufacture, but the selectivity and permeability are limited by Robeson's upper bound
Solution Approach 1:
The patent employs composite materials by combining polymer matrices with covalent triazine framework (CTF) fillers to create mixed matrix membranes. The CTFs provide high CO2 selectivity and permeability while the polymer matrix provides mechanical stability, together exceeding Robeson's upper bound for pure polymer membranes.
Solution Approach 2:
The patent utilizes porous covalent triazine framework materials as fillers within the membrane structure. The porous nature of CTFs provides pathways for selective gas transport, enabling enhanced CO2 permeability and selectivity compared to dense polymer membranes.
2Reliability
If polymer matrices are used to provide mechanical stability, then the membrane structure is stable, but the CO2 permeability and selectivity are insufficient
Solution Approach 1:
The patent creates a composite system where the polymer matrix provides mechanical stability and structural integrity, while the dispersed CTF filler particles provide the functional properties for high CO2 selectivity and permeability. This composite approach allows both requirements to be satisfied simultaneously.
Solution Approach 2:
The patent applies local quality by concentrating the high-performance CTF material at specific locations within the membrane structure (as dispersed filler particles), while the bulk polymer matrix provides the mechanical support. Each component performs its specialized function where it is most effective.
3Ease of manufacture
If traditional membrane technologies are used, then the technology is mature and easy to implement, but energy consumption is high and ecological impact is significant
Solution Approach 1:
The patent employs porous CTF fillers that provide selective pathways for CO2 transport through the membrane. This porous structure enables efficient gas separation at lower pressure differentials compared to traditional membranes, reducing the energy required for CO2 separation processes.
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 CTF-containing MMMs exhibit high chemical and thermal stability, enabling efficient CO2 separation from natural gas with improved selectivity and permeability, suitable for on-site applications at wellheads and other oil and gas production facilities, reducing energy consumption and ecological impact.
Implementation Method 1
CO2 separation from natural gas can be performed by membrane gas separation using CO2-selective membranes that selectively permeates CO2 while rejecting other gas components
Implementation Method 2
CO2 separation from natural gas can be performed by membrane gas separation using CO2-selective membranes that selectively permeates CO2 while rejecting other gas components such as methane (CH4) and other hydrocarbons
Data Source
AI summary
A method of synthesizing a mixed matrix membrane (MMM) film. The method includes: synthesizing a polymer including a polynorbornene or a polytricyclononene; synthesizing covalent-triazine frameworks (CTFs); preparing a polymer solution by dissolving the polymer in a first solvent; preparing a filler solution by dispersing the CTFs in a second solvent; adding the polymer solution to the filler solution while stirring the filler solution, forming a casting solution; pouring the casting solution into a membrane support; and drying the poured casting solution in the membrane support to form the MMM film including the CTFs.