Dilinoleic Acid Extraction for Portable Aviation Fuel Measurement
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Solution Overview
Problem
Current methods for measuring dilinoleic acid (DLA) in aviation fuels are not portable, require complex sample preparation, and are hindered by interference from naturally occurring oxygenates, making it difficult to accurately quantify CI/LI concentrations in the field.
Innovation Solution
A method involving gravity filtration through syringe barrels with filters and polar organic solvents to selectively extract DLA, followed by measurement using portable turbidimetry, spectrometry, or lateral flow devices, allowing for rapid and accurate quantification of DLA without advanced chemistry knowledge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid chromatography-mass spectroscopy (LC-MS) is used to measure dilinoleic acid concentration, then measurement precision is improved, but device complexity and portability are worsened
Solution Approach 1:
The patent extracts and isolates dilinoleic acid from the complex fuel matrix using solid phase extraction and liquid-liquid extraction techniques. This separates the target analyte from interfering substances, enabling simplified portable measurement while maintaining accuracy by focusing only on the extracted DLA in the supernatant layer
Solution Approach 2:
The patent introduces portable spectrometers as intermediary devices that bridge the gap between laboratory-grade LC-MS precision and field-portability requirements. These spectrometers measure specific wavelengths (230nm, 275nm, 310nm) to detect DLA concentration in extracted samples, providing laboratory-quality measurements without laboratory equipment
2Measurement precision
If size exclusion chromatography with refractive index detection is used, then measurement precision is improved, but ease of operation is worsened due to complex sample preparation
Solution Approach 1:
The patent segments the sample preparation process into distinct, manageable steps: filtration to remove particulates, solid phase extraction to concentrate DLA, and liquid-liquid extraction to isolate DLA in a clean supernatant. Each step is simplified and can be performed with basic equipment, making the overall process easier to execute while maintaining measurement precision
Solution Approach 2:
The patent performs preliminary filtration and extraction steps before measurement to pre-cleanup the sample. This preliminary action removes interfering substances and concentrates DLA, so that the subsequent spectrometric measurement can be performed directly on the prepared sample without requiring complex chromatographic separation during field operation
3Ease of operation
If direct spectroscopic measurement targeting C—O, C═O, and O—H bonds is used, then ease of operation is improved, but measurement precision is worsened due to interference from naturally occurring oxygenates
Solution Approach 1:
The patent extracts dilinoleic acid from the fuel matrix using selective solvents and extraction techniques. This isolation removes naturally occurring oxygenates that would otherwise interfere with spectroscopic measurement, allowing direct spectrometric detection of DLA at specific wavelengths without signal contamination from other fuel components
Solution Approach 2:
The patent measures absorbance at specific local wavelengths (230nm, 275nm, 310nm) where dilinoleic acid has characteristic absorption peaks. By focusing measurement on these specific spectral regions rather than the entire spectrum, the method achieves precision by targeting DLA's unique spectral fingerprint while minimizing interference from other oxygenates with different absorption characteristics
4Difficulty of detecting and measuring
If solid phase and liquid-liquid extraction techniques are used to separate DLA from fuel, then DLA isolation is improved, but measurement precision is worsened because all oxygen containing species are extracted
Solution Approach 1:
The patent changes the parameters of the extraction process by using specific solvent systems and pH conditions that selectively extract dilinoleic acid while leaving other oxygenates in the fuel phase or in different layers. By adjusting extraction parameters such as solvent polarity, pH, and temperature, the method achieves selective DLA isolation that maintains measurement precision by reducing co-extraction of interfering substances
Solution Approach 2:
The patent utilizes spectrometric detection based on absorbance (color) changes at specific wavelengths to quantify DLA concentration in the extracted sample. The method measures absorbance at 230nm, 275nm, and 310nm where DLA has characteristic absorption, allowing precise quantification by detecting the specific spectral signature of isolated DLA rather than total oxygenates, thus maintaining precision even after extraction
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
Enables rapid, portable, and selective extraction and quantification of DLA from aviation fuels, reducing measurement time to under five minutes and minimizing hazardous material usage, suitable for field validation of CI/LI concentrations.
Implementation Method 1
allowing the aviation fuel to flow through the filter via gravity filtration into a waste collection vial
Implementation Method 2
pipetting a polar organic solvent into the second syringe barrel and allowing the polar organic solvent to flow through the filter
Implementation Method 3
measuring concentration of dilinoleic acid in the volume in the sample collection vial
Implementation Method 4
measuring concentration of dilinoleic acid in the volume in the sample collection vial
Data Source
AI summary
A method for dilinoleic acid extraction and elution that includes the steps of pipetting aviation fuel into a first syringe barrel with a filter; allowing the aviation fuel to flow through the filter into a waste collection vial; pressing on a inserted first syringe plunger such that any remaining volume of fuel is expelled through the filter and into the waste collection vial; removing excess fuel from the filter; affixing the filter to a second syringe barrel; pipetting a polar organic solvent into the second syringe barrel and allowing the polar organic solvent to flow through the filter into a sample collection vial; expelling remaining volume of the polar organic solvent through the filter and into the sample collection vial; homogenizing contents of the sample collection vial; and, measuring concentration of dilinoleic acid in the volume in the sample collection vial.