Nanostructured Carbon Production via Oxygen-Enriched Combustion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing nanostructured carbon materials, such as carbon black and carbon nanotubes, face challenges including low yield, contamination with mineral impurities, high energy consumption, and high production costs, which limit their widespread use as additives in polymers and rubbers.
Innovation Solution
A method involving combustion of hydrocarbon fuel in an oxygen-enriched environment to produce high-temperature combustion products, forming a postcombustion gas stream, and introducing a hydrocarbon feedstock and catalyst precursor into a reaction zone at elevated temperatures to synthesize uniform nanostructured carbon materials, including carbon black and elongated nanostructures like nanofibers and nanotubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon nanotubes are used as filler additives in polymers and rubbers, then mechanical properties (stiffness, impact elasticity, strength) and performance characteristics (wear resistance, rolling resistance, tear strength) are improved, but production cost increases significantly
Solution Approach 1:
The patent combines the production of carbon black and carbon nanotubes into a single integrated process. Carbon black serves as both the primary product and as a substrate/support for nanotube formation during combustion synthesis. This merging eliminates the need for separate production processes and reduces overall manufacturing costs while producing a composite filler material with enhanced properties.
Solution Approach 2:
The combustion synthesis process generates heat in situ that automatically provides the high temperatures needed for carbon nanotube formation. The exothermic combustion reaction self-sustains the process conditions, eliminating the need for external heating systems and reducing energy costs. The carbon black particles formed during combustion serve as nucleation sites for nanotube growth, with no additional catalyst or substrate required.
2Reliability
If known methods produce carbon black with good electrically conductive properties, then conductivity is improved, but expensive acetylene feedstock must be used, increasing production cost
Solution Approach 1:
The patent changes the feedstock parameter from expensive acetylene to cheaper hydrocarbon sources such as natural gas, propane, or butane. By adjusting combustion parameters (oxygen concentration, temperature, residence time), the process maintains good electric conductivity of carbon black while dramatically reducing feedstock costs. The combustion synthesis conditions are optimized to produce conductive carbon structures without requiring acetylene.
3Productivity
If carbon black is produced by thermal decomposition in turbulent stream, then production efficiency is improved, but yield remains low and mineral impurities contaminate the product
Solution Approach 1:
The patent uses oxygen-enriched combustion (strong oxidation) to process the hydrocarbon feedstock. This accelerated oxidation in the combustion zone completely converts carbon to CO2, removing mineral impurities and contaminants that would otherwise remain in the product. The high-temperature combustion environment ensures complete decomposition and purification, yielding high-purity carbon black with no mineral contamination.
4Productivity
If combustion synthesis is used to produce nanostructured carbon material, then yield and production cost are improved, but uniform distribution and controlled morphology of nanostructures must be achieved
Solution Approach 1:
The patent employs dynamic combustion conditions with turbulent flow and rapidly changing temperature fields. The turbulent combustion process creates dynamic mixing that ensures uniform distribution of carbon structures throughout the product. By controlling combustion dynamics (flow velocity, oxygen concentration, residence time), the morphology of carbon structures (nanotubes, nanofibers, fullerenes) is controlled while maintaining uniform distribution and high yield.
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 enables the production of uniformly distributed nanostructured carbon materials with controlled morphology and properties, overcoming the limitations of existing methods by achieving high yield, reducing impurities, and lowering production costs, allowing for scalable industrial production.
Implementation Method 1
combusting hydrocarbon fuel in an oxygen-enriched environment to produce combustion products having a temperature of 1,000-3,150° C.
Implementation Method 2
the catalyst precursor is decomposed in to catalyst particles
Implementation Method 3
the hydrocarbon feedstock is decomposed to form carbon nanostructures and gaseous products
Data Source
AI summary
A method for producing nanostructured carbon material, including (a) combusting hydrocarbon fuel in an oxygen-enriched environment to produce combustion products having a temperature of 1,000-3,150° C.; (b) forming a postcombustion gas stream having a velocity of 40-800 m/s; (c) forming a working mixture by introducing hydrocarbon feedstock and a catalyst precursor for carbon nanostructures growth into the postcombustion gas stream; (d) introducing the working mixture into a reaction zone, wherein the reaction zone is maintained at a temperature of 900-2,300° C., and wherein the catalyst precursor is decomposed into catalyst particles, while the hydrocarbon feedstock is decomposed to form carbon nanostructures and gaseous products; and (e) separating carbon nanostructures from the gaseous products of the decomposition of hydrocarbon feedstock.