Tetracyclic Hydrocarbon Fuel Composition for Low-Temperature Energy Density
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Solution Overview
Problem
Existing high-density hydrocarbon fuels face challenges in achieving high energy density, high calorific value, and low freezing points, which are crucial for aerospace applications, particularly in low-temperature environments.
Innovation Solution
A precursor compound of a tetracyclic hydrocarbon is synthesized through photosensitized cycloaddition of norbornene and cyclohexenone, followed by hydrodeoxygenation to produce a tetracyclic hydrocarbon with a high density, high calorific value, and low freezing point, suitable for aerospace fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the carbon number and ring number of polycycloalkane hydrocarbon fuels are increased to increase density and calorific value, then the density and calorific value increase, but the volumetric net heat of combustion decreases
Solution Approach 1:
The patent changes the chemical structure parameters by introducing a specific tetracyclic hydrocarbon structure with controlled carbon number (14-18) and ring number (4), optimizing the balance between density and calorific value. This structural parameter optimization resolves the contradiction by achieving high density (0.986 g/cm³) while maintaining high volumetric net heat of combustion (41.14 MJ/L).
Solution Approach 2:
The patent creates a composite fuel system by combining the tetracyclic hydrocarbon with appropriate additives and blending ratios, forming a composite fuel composition that achieves both high density and high calorific value simultaneously, overcoming the trade-off between these two properties.
2Quantity of substance
If high-density hydrocarbon fuels are used to increase energy density, then the energy density increases, but the freezing point increases in low-temperature environments
Solution Approach 1:
The patent optimizes the molecular weight and structural parameters of the tetracyclic hydrocarbon to achieve a freezing point below -60°C while maintaining high energy density. This parameter optimization allows the fuel to remain fluid in low-temperature aerospace operating conditions.
3Ease of manufacture
If conventional alkylation and hydroisomerization methods are used to prepare high-density hydrocarbon fuels, then the production process is established, but the energy density and calorific value cannot be simultaneously maximized
Solution Approach 1:
The patent replaces conventional mechanical chemical processes (alkylation and hydroisomerization) with a photosensitized cycloaddition reaction method, enabling more efficient synthesis of tetracyclic hydrocarbons with optimized energy density and calorific value characteristics.
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 resulting tetracyclic hydrocarbon exhibits a density of 0.986 g/cm3, a volumetric net calorific value of 41.14 MJ/L, and a freezing point below −60°C, enhancing propulsion performance and flexibility in aerospace vehicles.
Implementation Method 1
subjecting norbornene and cyclohexenone to photosensitized cycloaddition under ultraviolet (UV) irradiation to obtain the precursor compound of the tetracyclic hydrocarbon
Implementation Method 2
subjecting a precursor compound of the tetracyclic hydrocarbon to hydrodeoxygenation in a hydrogen atmosphere to obtain the tetracyclic hydrocarbon
Data Source
AI summary
Provided are a precursor compound of a tetracyclic hydrocarbon and a preparation method thereof, and a tetracyclic hydrocarbon and a preparation method and use thereof. The precursor compound of the tetracyclic hydrocarbon with a structure shown in formula I has a polycyclic structure. The precursor compound is subjected to hydrodeoxygenation so as to be prepared into the tetracyclic hydrocarbon with a structure shown in formula II that has a high density (0.986 g/cm3), a high calorific value (41.14 MJ/L), and a low freezing point (less than −60° C.).