Diamondoid Fuel Synthesis for High Volumetric Energy Density
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Solution Overview
Problem
Conventional jet and diesel fuels have a lower volumetric net heat of combustion, limiting the range and performance of aircraft and missiles, and do not offer high-density, high-energy fuel options for propellant applications.
Innovation Solution
Production of diamondoid fuels through reacting halogenated diamondoids with allyl halogens in the presence of a Lewis acid catalyst, followed by reduction with a metal or treatment with a strong base to form fuels with higher volumetric net heat of combustion, which can be cross-linked to create polymeric fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional jet and diesel fuels are used, then the fuels are readily available and easy to manufacture, but the volumetric net heat of combustion is lower, limiting range and performance
Solution Approach 1:
The patent changes the chemical structure parameters of fuel molecules by synthesizing diamondoid structures with specific cage-like configurations (adamantane, diamantane, triamantane cores). This structural parameter change increases the volumetric net heat of combustion while maintaining manufacturability through defined chemical synthesis pathways from available precursors
Solution Approach 2:
The patent creates composite fuel formulations by combining diamondoid molecules with traditional hydrocarbon fuel components. This composite approach achieves higher volumetric energy density while maintaining compatibility with existing fuel infrastructure and combustion systems
2Use of energy by moving object
If diamondoid fuels are synthesized through chemical reactions, then the volumetric net heat of combustion increases, but the manufacturing process becomes more complex
Solution Approach 1:
The synthesis process is segmented into distinct modular steps: (1) formation of halogenated diamondoid precursors, (2) reaction with allyl halogens in the presence of Lewis acid catalysts, and (3) reduction or base treatment to form final fuels. This segmentation allows each step to be optimized independently and facilitates scale-up
Solution Approach 2:
The patent uses halogenated diamondoid compounds as intermediary structures that can be systematically transformed into final fuel products. These intermediaries serve as stable, handleable materials that bridge the gap between simple precursors and high-performance fuel molecules, simplifying the overall manufacturing process
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
Diamondoid fuels exhibit a higher volumetric net heat of combustion compared to conventional fuels, enhancing the range and performance of aircraft and missiles, and can be used to produce high-energy propellants.
Implementation Method 1
reacting halogenated diamondoids with allyl halogens in the presence of a Lewis acid catalyst
Implementation Method 2
followed by reduction with a metal or treatment with a strong base to form fuels
Data Source
AI summary
A diamondoid fuel comprising a cage structure including 10, 14, 18, or 22 carbons. The diamondoid fuel also includes one of one to four cyclopropyl groups bonded to the cage structure or two to four functional groups bonded to the cage structure where the functional groups are an alkyl group, an allyl group, a cyclopropyl group, or combinations thereof. Additionally, at least one functional group is an allyl group and at least one functional group is a cyclopropyl group.