Submicron Carbon Particles from Oil Ash Pyrolysis and Milling
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Solution Overview
Problem
Conventional methods for producing submicron and nanostructured carbon particles are costly due to complex infrastructure, expensive catalysts, and costly carbon sources, making them unsuitable for using industrial waste materials like oil ash.
Innovation Solution
A method involving pyrolysis of oil ash at 600 to 1000°C followed by milling to produce submicron carbon particles with a high carbon-to-oxygen ratio, devoid of carbon-oxygen double bonds, using an inert atmosphere and ball milling to achieve desired particle sizes and compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional bottom-up methods are used to produce submicron carbon particles, then high surface area and unique properties are achieved, but production cost becomes very high
Solution Approach 1:
The patent inverts the conventional bottom-up approach by using a top-down method: starting with micron-sized carbon particles from oil ash and reducing them to submicron/nanoparticles through mechanical milling. This reversal achieves the desired particle size distribution without requiring expensive catalysts, controlled chemical reactions, or specialized infrastructure, thereby dramatically reducing production costs while maintaining particle quality
Solution Approach 2:
The patent employs inexpensive, readily available materials throughout the process: oil ash as carbon source, standard milling media (balls), and conventional milling equipment. This eliminates the need for expensive catalysts, specialized precursors, and complex reaction vessels, making the production process economically viable while achieving the same particle size control as conventional methods
2Manufacturing precision
If bottom-up processes with controlled reactions are used, then submicron/nanoparticles are produced, but complex and expensive infrastructure is required
Solution Approach 1:
The patent replaces complex chemical reaction systems with a purely mechanical approach. Instead of using controlled chemical vapor deposition, sol-gel processes, or catalytic reactions that require sophisticated infrastructure, the invention uses mechanical milling to reduce particle size. This substitution eliminates the need for temperature-controlled reaction chambers, catalyst handling systems, and complex process control infrastructure, while achieving the same submicron particle production
3Manufacturing precision
If expensive catalysts and carbon sources like glucose are used, then high quality carbon particles are produced, but production cost increases significantly
Solution Approach 1:
The patent uses oil ash, an industrial waste material, as the carbon source instead of expensive precursors like glucose or acetylene. The milling media (balls) are also inexpensive and can be readily replaced. This approach produces high-quality submicron carbon particles with controlled size distribution while minimizing material costs, as the entire process uses low-cost, readily available materials
4Manufacturing precision
If limited batch sizes are used in conventional methods, then controlled reactions are maintained, but productivity is reduced
Solution Approach 1:
The patent enables continuous or large-batch processing through mechanical milling, which can handle large volumes of material simultaneously without compromising particle size control. Unlike sequential chemical reactions that require small batches for precise control, the mechanical milling process can process kilograms or tons of oil ash in a single operation, maintaining uniform particle reduction throughout the batch and significantly increasing productivity
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 method effectively converts oil ash into submicron carbon particles with high carbon content and specific structural properties, reducing production costs and utilizing industrial waste, suitable for various applications including electrochemical and construction uses.
Implementation Method 1
pyrolyzing oil ash at 600 to 1000° C. for 1 to 6 hours to produce a pyrolyzed oil ash
Implementation Method 2
milling the pyrolyzed oil ash for 1 to 24 hours to produce the submicron carbon particles
Data Source
AI summary
A method of producing submicron carbon particles from oil ash. The method comprises pyrolyzing the oil ash to produce a pyrolyzed oil ash and milling the pyrolyzed oil ash to produce carbon particles having a mean particle size in the submicron regime. The method produces submicron carbon particles which have a very high carbon content (90 to 99 atom %) and a very low content of oxygen, the particles having a ratio of carbon to oxygen ratio of 10:1 to 99:1. The size of the particles may be controlled by the duration of the milling. The submicron carbon particles are devoid of functionalities containing carbon-oxygen double bonds as measured by Raman spectroscopy and X-ray photoelectron spectroscopy (XPS).