Jet Fuel Breakpoint Stability via Accelerated Aging
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Solution Overview
Problem
Jet fuel fractions derived from pre-refined crude oils exhibit unsatisfactory breakpoint stability over time, leading to variability in properties and difficulties in qualifying their thermal stability using conventional ASTM standards, as these standards do not account for the increased reactivity of heteroatoms and functional groups present in these fractions.
Innovation Solution
A method is developed to determine the stability of jet fuel products by using an accelerated aging test, where a distillate fraction from pre-refined crude oil is aged at elevated temperatures to assess its breakpoint stability, and if stable, a jet fuel product is prepared with a kerosene portion from the same source, ensuring the final product maintains stability and meets ASTM D1655 specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If jet fuel fractions are derived from pre-refined crude oils, then production flexibility and feedstock versatility are improved, but breakpoint stability over time deteriorates due to increased reactivity of heteroatoms and functional groups
Solution Approach 1:
The patent applies preliminary action by conducting accelerated aging tests before the jet fuel is put into service. The breakpoint is determined on a fresh sample, then the sample is aged at elevated temperature (e.g., 100°C) for a specified period (e.g., 168 hours), and the breakpoint is determined again. This preliminary stability assessment allows the fuel to be qualified in advance, ensuring it will maintain adequate breakpoint during actual storage and service conditions.
Solution Approach 2:
The patent applies parameter changes by modifying the testing conditions rather than the fuel composition. Instead of changing the fuel formulation to improve stability, the method changes the temperature and time parameters of the breakpoint determination test. By conducting tests at elevated temperatures and extended durations, the method accelerates the detection of breakpoint changes, allowing prediction of long-term stability without altering the fuel's chemical composition.
2Device complexity
If conventional ASTM standards are used for qualification, then testing procedure simplicity is maintained, but reliability of stability assessment deteriorates due to inability to account for increased reactivity
Solution Approach 1:
The patent applies preliminary action by conducting accelerated aging tests before the jet fuel is put into service. The breakpoint is determined on a fresh sample, then the sample is aged at elevated temperature (e.g., 100°C) for a specified period (e.g., 168 hours), and the breakpoint is determined again. This preliminary stability assessment allows the fuel to be qualified in advance, ensuring it will maintain adequate breakpoint during actual storage and service conditions.
Solution Approach 2:
The patent applies parameter changes by modifying the testing conditions rather than the fuel composition. Instead of changing the fuel formulation to improve stability, the method changes the temperature and time parameters of the breakpoint determination test. By conducting tests at elevated temperatures and extended durations, the method accelerates the detection of breakpoint changes, allowing prediction of long-term stability without altering the fuel's chemical composition.
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 ensures the stability of jet fuel products over time by maintaining breakpoint stability within acceptable limits, allowing for the reliable use of pre-refined crude-derived jet fuels by simulating long-term storage conditions and ensuring compliance with ASTM standards.
Implementation Method 1
maintaining a second sample of the distillate fraction at a temperature of at least 40°C for an aging period of at least six weeks
Implementation Method 2
distilling a first crude oil feedstock comprising at least a first volume percentage of a first pre-refined crude oil to form a first distillate fraction having an initial boiling point of at least about 284°F (140 °C) and a final boiling point of about 572°F (300°C) or less
Data Source
AI summary
Methods are provided for qualifying jet fuel fractions that are derived at least in part from pre-refined crude oil sources. The methods allow for determination of the stability of a jet fuel product over time by using an accelerated aging test. The methods are beneficial for verifying the stability of a jet fuel fraction that includes a portion derived from a pre-refined crude oil.