Perforated Graphene Composite Membranes for Gas Separation
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Solution Overview
Problem
Conventional gas separation membranes are not highly efficient, particularly at modest H2S concentrations, and lack chemical stability under certain process conditions, limiting their effectiveness in industrial gas separation processes.
Innovation Solution
The development of composite separation membranes comprising a dense polymeric membrane and a layer of perforated two-dimensional materials, such as graphene, which utilize both solution-diffusion and molecular sieving mechanisms to achieve high selectivity and permeability, allowing preferential transport of desired gases over undesired ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer membranes are used for gas separation, then the membranes can provide some separation capability, but they exhibit inadequate performance for certain gas mixtures and lack chemical stability under certain process conditions
Solution Approach 1:
The patent combines polymer matrices with two-dimensional materials (graphene, MoS2, h-BN) to create composite membranes that integrate the chemical stability and flexibility of polymers with the high selectivity and stability of 2D materials, resolving the contradiction between reliability and productivity in gas separation
Solution Approach 2:
The patent utilizes porous structures in both the polymer matrices and two-dimensional material layers, creating controlled pore networks that enable efficient gas transport while maintaining structural stability, thereby improving separation efficiency without sacrificing chemical stability
2Productivity
If conventional membranes are used for gas separation, then they require low maintenance and exhibit low energy consumption, but they are not highly efficient and do not compete well with bulk separation processes
Solution Approach 1:
The patent optimizes multiple parameters including pore size distribution, layer thickness, and material composition of the composite membranes to achieve high separation efficiency at lower energy consumption, allowing the membranes to outperform both conventional membranes and bulk separation processes
3Productivity
If specialized polymer membranes are developed for specific gas separation applications, then they can enhance permeation rate of desired gases, but they display inadequate performance for certain gas mixtures or are not applicable to certain process conditions
Solution Approach 1:
The patent develops composite membrane systems where the polymer matrix and two-dimensional material layers work together to provide universal separation capability across different gas mixtures and process conditions, with the ability to tune performance for specific applications through material selection and structural design
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 composite membranes provide enhanced separation ratios and efficiency, enabling the separation of gas mixtures with high selectivity and permeability, even at challenging concentration levels, while maintaining mechanical and chemical stability.
Implementation Method 1
The two-dimensional material can be perforated before or after being stacked with the polymer layers. In specific embodiments, the at least one layer of polymer exhibits permeance to one or more gases via one or more solution diffusion processes.
Implementation Method 2
The filter of perforated two dimensional material (i.e., perforated graphene layers) can block or limit passage of molecules larger than the holes in the two dimensional material, while at the same time permitting passage of smaller molecules.
Data Source
AI summary
Perforated graphene sheets can be used in forming separation membranes. Separation membranes of the present disclosure, which can be used in gas separation processes in some embodiments, can include one or more polymer layers and one or more layers of perforated graphene. Methods for separating a gas mixture can include contacting a gas mixture with the separation membranes, and transiting one or more of the gases through the perforated graphene so as to affect separation.