Coal-Derived Carbon Fiber via Variable-Crystallinity Spinning
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Solution Overview
Problem
Existing carbon fiber production methods, such as those based on polyacrylonitrile (PAN) or pitch, are costly and exhibit low electrical conductivity, necessitating the development of more affordable and high-yielding alternatives.
Innovation Solution
A method for manufacturing low-density carbon fiber from coal using a coal-derived electroactive polymer and a direct air capture system, involving processes like liquefaction, variable crystallinity spinning, oxygen stabilization, and carbonization, with additives to alter pitch composition and introduce voids, to produce low thermal conductivity carbon fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional carbon fiber production methods (PAN-based or pitch-based) are used, then carbon fiber can be manufactured, but the production cost is high and electrical conductivity is low
Solution Approach 1:
The patent changes the chemical composition parameters of the pitch precursor by incorporating coal-derived pitch with specific aromatic content (85-95% carbon) and controlling the molecular weight distribution. This parameter modification enables both cost reduction and improved electrical conductivity simultaneously
Solution Approach 2:
The patent creates a composite pitch system by blending coal-derived pitch with conventional pitch materials in specific ratios. This composite approach combines the cost advantages and electrical conductivity of coal-derived pitch with the processing benefits of conventional pitch, resolving the contradiction between manufacturability and performance
2Loss of energy
If density of carbon fiber is reduced for insulation applications, then thermal insulation performance improves, but mechanical strength decreases
Solution Approach 1:
The patent applies local quality by creating a hierarchical structure where the bulk material has low density for insulation, while specific localized regions maintain higher density and crystallinity for mechanical strength. The controlled void distribution and regional crystallinity variations enable simultaneous optimization of both insulation and strength properties
Solution Approach 2:
The patent utilizes porous materials by introducing controlled voids and pores within the carbon fiber structure. These pores reduce overall density and improve thermal insulation, while the pore walls and interconnective structure maintain mechanical integrity. The porosity is optimized to balance insulation performance with structural strength
3Productivity
If yield of carbon fiber production is increased, then production efficiency improves, but quality consistency deteriorates
Solution Approach 1:
The patent implements continuous carbonization processing where the pitch-to-carbon fiber conversion occurs in a continuous manner rather than batch processing. This continuity maintains stable reaction conditions, ensures consistent product quality, and maximizes production yield simultaneously by eliminating start-stop cycles that cause quality variations
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 method results in low-cost, high-yielding carbon fiber with improved insulating properties and the ability to capture carbon dioxide efficiently, reducing thermal conductivity and enhancing energy efficiency in building insulation.
Implementation Method 1
a voltage source and a coal-derived electroactive polymer in electrical communication with the voltage source. The direct air capture system can be configured to bind carbon dioxide to the coal-derived electroactive polymer when a voltage is applied to the coal-derived electroactive polymer
Implementation Method 2
subjecting the pitch resin to a variable crystallinity spinning process effective to form raw fiber
Implementation Method 3
subjecting the raw fiber to an oxygen stabilization process
Implementation Method 4
subjecting the stabilized fiber to a carbonization process effective to form a low thermal conductivity carbon fiber
Implementation Method 5
The method may include foaming the raw fiber effective to introduce voids in the carbon fiber
Data Source
AI summary
Embodiments discloses herein relate to methods of processing coal. A method to process coal includes subjecting raw coal to a liquefaction process effective to form a pitch resin, subjecting the pitch resin to a variable crystallinity spinning process effective to form raw fiber, and subjecting the raw fiber to a carbonization process effective to form a low thermal conductivity carbon fiber.