Polyether Epoxy Membrane for Ethanol Aromatic Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polymeric membranes suffer from instability and reduced performance in the presence of alcohols, particularly ethanol, which limits their effectiveness in separating aromatics from hydrocarbon feedstreams, and there is a need for improved stability and selectivity in membrane separation processes.
Innovation Solution
A polymeric aromatic selective membrane composed of a polyether epoxy resin with an aliphatic substituted epoxide, where the epoxide does not contain a heteroatom within three atoms of the epoxide group, is developed, which enhances the membrane's stability and selectivity in alcohol-containing environments, allowing for effective separation of ethanol and aromatics from hydrocarbon streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymeric membranes are used for separation, then the membrane structure provides initial separation capability, but the membrane suffers from instability and performance degradation in the presence of alcohols
Solution Approach 1:
The patent modifies the chemical structure parameters of the polymeric membrane by incorporating specific ether-linked structures and controlling the presence/absence of heteroatoms at defined positions in the polymer chain. This structural parameter change enables the membrane to resist alcohol-induced degradation while maintaining separation performance.
Solution Approach 2:
The patent creates a composite polymeric membrane structure combining hydrocarbon segments with ether-linked segments in a specific architecture. This composite structure leverages the stability of hydrocarbon chains while incorporating ether linkages that provide alcohol resistance, achieving both reliability and productivity.
2Manufacturing precision
If the membrane is designed for high selectivity in aromatic separation, then separation efficiency improves, but the membrane becomes more susceptible to alcohol-induced instability
Solution Approach 1:
The patent applies local quality by creating specific functional regions within the polymer chain - ether-linked segments positioned at intervals along the hydrocarbon backbone. These localized ether regions provide alcohol resistance precisely where needed, while the majority hydrocarbon structure maintains high aromatic separation selectivity.
Solution Approach 2:
The patent carefully controls the positional parameters of heteroatoms in the polymer structure, specifically ensuring no heteroatom appears within three atoms of the epoxide group. This precise parameter control achieves both stability and selectivity.
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 polyether epoxy resin-based membrane demonstrates improved physical integrity and selectivity, maintaining performance even in high alcohol content feeds, achieving enhanced separation efficiency and stability over extended periods, thereby overcoming the limitations of existing membrane technologies.
Implementation Method 1
The membrane is typically exposed at one side to a stream comprised of a mixture of liquid feeds, and a vacuum is typically applied to the membrane at the opposite side so that the adsorbed component migrates through the membrane and is removed as a vapor from the opposite side of the membrane via a solution-diffusion mechanism.
Implementation Method 2
a desired feed component, e.g., an aromatic component, of a liquid and/or vapor feed is preferentially absorbed by the membrane
Implementation Method 3
A concentration gradient driving force is established to selectively pass the desired components through the membrane from its feed or upstream side to its permeate or downstream side.
Implementation Method 4
the polymeric membrane composition and its use in a process for the separation of ethanol and aromatics from a hydrocarbon feedstream containing aromatics and aliphatic compounds and at least one alcohol, typically ethanol
Data Source
AI summary
The present invention is directed to a membrane for ethanol and aromatics separation that is stable in an alcohol containing environment. The membrane is a polyether epoxy resin having an aliphatic substituted epoxide. The invention also teaches a method to control the flux and selectivity of the membrane.