Ionic Liquids with Heteroaromatic Anions for Low Viscosity Gas Separation
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Solution Overview
Problem
Current ionic liquids used for separating or absorbing acidic gases, such as CO2, often become highly viscous upon absorption, making them unsuitable for industrial applications, and lack efficient methods for gas removal and recycling.
Innovation Solution
Development of ionic liquids with specific anions like pyrrolide, pyrazolide, indolide, phospholide, or imidazolide, which maintain low viscosity during CO2 absorption and allow for easy recovery of absorbed gases through heat or reduced pressure, using formulas such as [Het··CO2]− for enhanced gas separation and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional ionic liquids are used for absorbing acidic gases like CO2, then gas absorption capacity is improved, but viscosity increases significantly making the liquid unsuitable for industrial applications
Solution Approach 1:
The patent changes the chemical structure parameters of the ionic liquid anions, specifically using heteroaromatic anions with delocalized negative charge (such as pyrrolide, pyrazolide, indolide, phospholide, or imidazolide rings) to reduce interionic interactions and maintain low viscosity even when CO2 is absorbed. This structural parameter change allows the ionic liquid to absorb acidic gases effectively while preventing excessive viscosity increase.
2Productivity
If ionic liquids are designed for high gas absorption, then separation efficiency is improved, but energy consumption for gas removal and liquid recycling increases
Solution Approach 1:
The patent exploits phase transition principles by designing ionic liquids that undergo reversible physical changes when absorbing and releasing CO2. The heteroaromatic anions form reversible complexes with CO2 that can be easily broken by applying heat or reduced pressure, allowing the ionic liquid to transition between CO2-loaded and CO2-free states. This enables efficient gas removal and liquid recycling with minimal energy input.
3Reliability
If conventional ionic liquids absorb acidic gases, then carbon capture capability is improved, but the liquid becomes highly viscous and difficult to recycle
Solution Approach 1:
The patent creates composite ionic liquid systems combining specific cations with heteroaromatic anions (pyrrolide, pyrazolide, indolide, phospholide, or imidazolide) to achieve both high CO2 absorption capacity and low viscosity. The unique electronic structure of these heteroaromatic anions with delocalized negative charge creates a composite material that maintains fluidity while effectively capturing carbon dioxide, enabling reliable and sustainable recycling operations.
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
These ionic liquids effectively absorb and release acidic gases with minimal viscosity increase, enabling efficient CO2 capture and recycling, reducing energy consumption and operational costs in industrial processes.
Implementation Method 1
ionic liquids used for separating or absorbing acidic gases
Implementation Method 2
Het··CO2 where ·· represents a covalent or non-covalent bonding interaction
Implementation Method 3
allow for easy recovery of absorbed gases through heat or reduced pressure
Data Source
AI summary
Some embodiments described herein relate to ionic liquids comprising an anion of a heteraromatic compound such as optionally substituted pyrrolide, optionally substituted pyrazolide, optionally substituted indolide, optionally substituted phospholide, or optionally substituted imidazolide. Methods and devices for gas separation or gas absorption related to these ionic liquids are also described herein.