Mixed-Matrix Membrane for Olefin Separation
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Solution Overview
Problem
Conventional molecular separation methods, such as distillation and polymeric membranes, are energy-intensive and limited by a permeability-selectivity trade-off, making them unsuitable for efficient large-scale chemical separation, particularly for separating closely related molecular species like olefins and paraffins.
Innovation Solution
A molecular separation device comprising a porous, polycrystalline membrane with a dispersed nanocrystalline material, forming a mixed-matrix membrane that is free of polymers from organic monomers, utilizing materials like metal-organic frameworks (MOFs) and zeolites to achieve superior separation characteristics beyond the Robeson upper bound curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polymeric membranes are used for molecular separation, then ease of manufacture and processability are improved, but permeability and selectivity are constrained by the Robeson upper bound curve
Solution Approach 1:
The patent employs mixed-matrix membranes combining polymeric matrix with dispersed inorganic nanoparticles (zeolites, metal-organic frameworks, or carbon molecular sieves). This composite structure allows the membrane to benefit from both the processability of polymers and the superior separation performance of inorganic materials, achieving permeability-selectivity pairs that exceed the Robeson upper bound curve for conventional polymeric membranes.
2Reliability
If hybrid mixed-matrix membranes with high loading of dispersed phase are used to improve performance beyond Robeson upper bound, then permeability and selectivity are improved, but manufacturing complexity and defect formation increase
Solution Approach 1:
The patent incorporates inorganic nanoparticles into the polymeric matrix during the membrane formation process itself, rather than attempting to blend pre-formed components. This preliminary incorporation ensures uniform distribution of the dispersed phase at optimal concentrations (1-50 wt%) and prevents aggregation, thereby achieving high separation performance without the manufacturing complexities associated with post-formation modifications or high-loading blends.
3Reliability
If conventional distillation and rectification methods are used for molecular separation, then separation capability is achieved, but energy consumption is excessive
Solution Approach 1:
The patent utilizes porous inorganic materials (zeolites, metal-organic frameworks, carbon molecular sieves) with well-defined pore sizes and structures as the dispersed phase in the mixed-matrix membrane. These materials provide selective molecular transport pathways that enable separation based on molecular size, shape, and interactions, achieving high separation capability for closely related species (such as olefin/paraffin separation) with significantly reduced energy consumption compared to thermal distillation 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 device demonstrates enhanced permeability and selectivity, enabling efficient separation of molecular species, including azeotropes, with reduced energy consumption and improved robustness, surpassing the performance of conventional membranes.
Implementation Method 1
nanoporous material such as a zeolite, metal-organic framework (MOP), or two-dimensional layered structure are dispersed in polymeric membranes
Implementation Method 2
highly selective and permeable molecular sieve zeolite, CMS, or MOF materials
Implementation Method 3
mixed-matrix membranes formed by dispersing highly selective and permeable molecular sieve zeolite, CMS, or MOF materials into the polymeric matrix
Data Source
AI summary
Systems, devices and methods for molecular separation including a molecular separation device comprising at least a polycrystalline metal-organic framework (MOF) and a nanocrystalline, zeolite MFI, wherein the MOF forms a polycrystalline membrane with zeolite MFI nanoparticles dispersed therein, and the MOF membrane matrix contacting and surrounding the zeolite MFI nanoparticles form a permselective nanoporous structure.