Jet Fuel Blend Density and Elastomer Compatibility
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Solution Overview
Problem
Current jet fuels, particularly Fischer-Tropsch-derived fuels, have limitations due to their low density and lack of aromatic components, which affect their compatibility with elastomers used in aircraft, leading to issues with swelling and leakage, and are restricted to a maximum 50% volume in blends to maintain jet fuel specifications.
Innovation Solution
A method involving blending a synthetic paraffinic kerosene fuel component with a petroleum-based jet fuel component and pinane, in specific ratios, to achieve a jet fuel blend with a density of 775 to 840 kg/m³ and acceptable elastomer swelling, allowing for increased concentration of synthetic paraffinic kerosene beyond 50% while maintaining aromatic content below 10vol%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If pure Fischer-Tropsch fuel is used, then sulfur and aromatic content are reduced to zero, but density decreases and elastomer swelling is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the fuel by introducing pinane (a cyclic terpene with specific molecular structure) into the Fischer-Tropsch fuel blend. This additive modifies the fuel's interaction with elastomers, providing adequate swelling (5-20% volume increase) while maintaining the low sulfur and aromatic content characteristics of synthetic fuels.
2Object-generated harmful factors
If pure Fischer-Tropsch fuel is used, then environmental emissions are reduced, but density falls below specification (775-840 kg/m³)
Solution Approach 1:
The patent adjusts the density parameter of the fuel blend by adding pinane, which has a density of approximately 860 kg/m³. This allows the final blend to meet the specification range of 775-840 kg/m³ while maintaining the environmental benefits of Fischer-Tropsch fuel with minimal sulfur and aromatic content.
3Object-generated harmful factors
If synthetic paraffinic kerosene is increased beyond 50% volume, then cleaner burning is achieved, but elastomer compatibility deteriorates
Solution Approach 1:
The patent uses pinane as an intermediary substance that mediates between the Fischer-Tropsch fuel and the elastomer components. The pinane acts as a chemical bridge that provides the necessary swelling effect for elastomer compatibility while allowing high concentrations of synthetic paraffinic kerosene (up to 70-80% volume) to maintain clean burning characteristics.
4Object-generated harmful factors
If aromatic content is reduced to improve environmental performance, then particulate formation decreases, but elastomer swelling is compromised
Solution Approach 1:
The patent changes the chemical composition by introducing pinane, a cyclic hydrocarbon with unique swelling properties. This allows the fuel to maintain aromatic content at or near zero while still achieving 5-20% elastomer swelling through the pinane's molecular interaction with the elastomer, thereby eliminating particulate-forming aromatics without sacrificing elastomer compatibility.
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 provides a jet fuel blend that meets density and elastomer swelling specifications, enabling a higher proportion of synthetic paraffinic kerosene while ensuring compatibility with existing aircraft elastomers and adhering to jet fuel standards.
Implementation Method 1
blending component a), b) and c), wherein component c) is present in an amount of 5 to 40 weight percent, based on the blend, and component a) and b) are in a ratio of greater than 1 to 1 thereby providing a jet fuel blend having a density of from 775 to 840 kg/m3
Data Source
Figure 1~2
Figure 3
AI summary
A jet fuel containing a major amount of a synthetic paraffinic kerosene fuel component is provided by: a) providing a synthetic paraffinic kerosene fuel component in the jet boiling range having at least 99.5wt% hydrocarbon, said hydrocarbon being at least 98.5wt% paraffins, less than 1wt% bicyclic compounds, and less than 0.5wt% total aromatics as measured by ASTM D2425; b) providing a petroleum-based jet fuel component in the jet boiling range; c) providing pinane; and d) blending component a), b) and c), wherein component c) is present in an amount of 5 to 40 weight percent, based on the blend, and component a) and b) are in a ratio of greater than 1 to 1 thereby providing a jet fuel blend having a density of from 775 to 840 kg/m3.