Ionic Liquid Coal Treatment for Carbon Fiber and Rare Earth Recovery
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Solution Overview
Problem
Current methods for coal depolymerization and carbon fiber production face challenges in using environmentally friendly processes and achieving enhanced capacitance in carbon-based materials, particularly due to the lack of compatibility of carbon networks with O-/N-functional groups and the limitations of traditional solvents like ZnCl2.
Innovation Solution
The use of ionic liquids to treat coal, forming a mixture that is then processed to extract carbon fiber precursors, allowing for the formation of carbon fibers with enhanced capacitance and the recovery of rare earth elements, providing an environmentally friendly and efficient method for producing carbon-based materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional solvents like ZnCl2 are used for coal depolymerization, then carbon fiber production is achieved, but environmental friendliness and reversible redox capabilities are compromised
Solution Approach 1:
The patent changes the chemical parameters of the solvent system by replacing traditional ZnCl2-based solvents with ionic liquids that contain O-/N-heteroatoms. This parameter change enables the solvent to provide reversible redox capabilities while maintaining coal depolymerization effectiveness and carbon fiber production capability, thereby resolving the contradiction between production reliability and environmental harm.
Solution Approach 2:
The patent employs ionic liquids as replaceable, environmentally friendly solvent systems that can be discarded after use without causing long-term environmental harm. These ionic liquid solvents serve as single-use or limited-use materials that eliminate the persistent environmental issues associated with traditional ZnCl2 solvents, while still achieving the desired carbon fiber production.
2Ease of manufacture
If coal is treated with strong acids for depolymerization, then carbon fiber precursors are obtained, but environmental friendliness is compromised
Solution Approach 1:
The patent introduces ionic liquids as intermediary substances that mediate the depolymerization process instead of using strong acids. These ionic liquid intermediaries perform the necessary chemical functions of breaking down coal macromolecules into usable precursors while avoiding the harmful environmental effects of strong acid treatment, thus resolving the contradiction between ease of manufacture and environmental harm.
Solution Approach 2:
The patent converts the potentially harmful strong acid treatment step into a beneficial ionic liquid-based process. By replacing the harmful acid with environmentally friendly ionic liquids, the process transforms a harmful operation into a beneficial one that maintains manufacturing effectiveness while eliminating environmental damage.
3Ease of operation
If conventional solvents are used for coal dissolution, then processing is simplified, but compatibility with O-/N-functional groups is poor
Solution Approach 1:
The patent changes the functional parameters of the solvent by selecting ionic liquids with specific O-/N-heteroatom compositions. This parameter change enhances the solvent's compatibility and adaptability with O-/N-functional groups in coal structures, while the ionic liquid formulation maintains ease of operation through its liquid state and dissolving capabilities.
Solution Approach 2:
The patent employs composite ionic liquid formulations that combine multiple components with complementary O-/N-heteroatom functionalities. This composite approach creates a solvent system that is both adaptable to various coal structures with different functional groups and maintains operational simplicity, resolving the contradiction between adaptability and ease of operation.
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
This approach enables the production of carbon fibers with improved capacitance and the recovery of rare earth elements, overcoming the limitations of traditional methods by utilizing ionic liquids to break down coal's macromolecular framework and extract valuable compounds, resulting in higher performance carbon-based materials and sustainable processing.
Implementation Method 1
Fragmented particles and liquid fractions can be produced separately via depolymerization of coal networks through the cleavage of intramolecular bonds
Implementation Method 2
depolymerization processes allow fragmented coal to be solvated by various solvents
Implementation Method 3
isolating a residue from the first mixture
Implementation Method 4
separating and filtering the liquid fraction from the mixture
Implementation Method 5
forming a second mixture comprising the residue, and electrospinning the second mixture to form a carbon fiber precursor material
Data Source
AI summary
In a first embodiment, a coal treatment process includes exposing a material comprising coal to ionic liquid(s) to form a first mixture, isolating a residue from the first mixture, forming a second mixture comprising the residue, and electrospinning the second mixture to form a carbon fiber precursor material. In a second embodiment, a coal treatment process includes exposing a material comprising coal to ionic liquid(s) to form a mixture comprising solids and a liquid fraction, separating and filtering the liquid fraction from the mixture, and isolating one or more compounds from the liquid fraction. In a third embodiment, a coal treatment process includes exposing a material comprising coal to ionic liquid(s) to form a first mixture comprising residues, exposing the first mixture to (a) an acid, (b) a solvent, or (c) both to form a second mixture, and isolating rare earth elements and rare earth element compounds.