Mixed Matrix Membranes for Olefin Separation
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Solution Overview
Problem
Current membrane technologies for olefin/paraffin separation face challenges such as a trade-off between selectivity and flux, poor stability under industrial conditions, fouling by contaminants, and high production costs, which hinder their commercialization for industrial-scale applications.
Innovation Solution
Development of a mixed matrix membrane (MMM) composed of a polymer matrix and metal-doped zeolite material, which enhances selectivity, permeability, and mechanical integrity, using inorganic fillers like molecular sieves and nano-metal oxides to create a cost-effective and durable separation solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polymeric membranes are used for olefin/paraffin separation, then ease of manufacture is improved, but selectivity and gas flux are inadequate
Solution Approach 1:
The patent employs composite membranes combining polymeric materials with inorganic fillers (zeolites, metal organic frameworks, or carbon molecular sieves) to achieve both ease of manufacture and high selectivity. The inorganic fillers provide the necessary separation performance while the polymeric matrix enables straightforward fabrication processes.
Solution Approach 2:
The invention utilizes porous inorganic materials such as zeolites, metal organic frameworks, and carbon molecular sieves as fillers within the polymeric membrane. These porous materials provide well-defined pore structures that enable high selectivity for olefin/paraffin separation while maintaining gas flux.
2Reliability
If facilitated transport membranes with high silver salt loading are used, then olefin selectivity is improved, but carrier stability deteriorates due to washout of silver ions
Solution Approach 1:
The patent replaces washable silver salt carriers with non-washable inorganic porous materials (zeolites, metal organic frameworks, carbon molecular sieves) that provide permanent, stable olefin selectivity through their rigid pore structures. These materials cannot be washed out and maintain their separation performance under operating conditions.
Solution Approach 2:
The invention creates composite membranes where inorganic porous materials are embedded in a polymeric matrix, combining the stability of inorganic materials with the processability of polymers. This composite structure provides both high olefin selectivity and long-term carrier stability.
3Stability of the object's composition
If inorganic membranes are used, then thermal and chemical stability is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent creates composite membranes where thin layers of inorganic materials are embedded within polymeric matrices. This approach provides the thermal and chemical stability of inorganic materials while leveraging the ease of manufacturing polymeric membranes, thereby reducing overall manufacturing complexity.
Solution Approach 2:
The invention uses porous inorganic fillers dispersed in the polymeric matrix to provide thermal and chemical stability. The porous structure of these fillers also contributes to the separation performance, achieving multiple functions simultaneously without significantly increasing manufacturing complexity.
4Use of energy by moving object
If membrane separation is implemented, then energy efficiency is improved, but fouling by contaminants occurs
Solution Approach 1:
The patent employs porous inorganic materials with well-defined pore sizes and chemically inert surfaces that resist fouling by contaminants. The rigid pore structures prevent contamination buildup, and the chemical inertness of materials like carbon molecular sieves and zeolites reduces interactions with foulants, maintaining energy efficiency over time.
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 MMM achieves high selectivity and flux with improved stability and durability, enabling efficient olefin/paraffin separation in industrial settings, overcoming the limitations of existing membrane technologies.
Implementation Method 1
The membranes, made through a unique procedure, comprise at least one polymer matrix and at least one metal-doped zeolite material
Implementation Method 2
This composite MMM is designed for gas separation in applications such as olefin purification from olefin/paraffin mixtures
Data Source
AI summary
The invention provides mixed matrix membranes (MMMs) for olefin/paraffin separation and methodes of making and using the same. The MMMs comprise a continuous polymer matrix with metal doped zeolite nano-particles. A separation technology based upon the composite membranes is effective for propylene and other olefin separation from olefin/paraffin mixtures, and the separation is more energy-efficient than the conventional cryogenic technique.