Aminophenol Antioxidant Composition for Biodiesel Oxidation Stability
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Solution Overview
Problem
Biodiesel and biolubricants face challenges in maintaining oxidation stability due to the removal of natural antioxidants during manufacturing, leading to issues like sedimentation, gum formation, and corrosion in engines, with conventional antioxidants often requiring high concentrations and being incompatible with bio-based fuels or causing environmental concerns.
Innovation Solution
The use of oxygenated aminophenol antioxidants, specifically compounds of Formula I, which are compatible with bio-based fuels and lubricants, effectively inhibiting oxidation without compromising combustion, lubricity, or flow properties, even at low temperatures, and reducing sedimentation and corrosion in engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antioxidants are used to inhibit oxidation of biodiesel and biolubricants, then oxidation stability is improved, but the antioxidants are incompatible with bio-based fuels or require high concentrations that compromise combustion, lubricity, or flow properties
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of phenolic antioxidants through N-alkylation with glycidyl ethers, transforming conventional antioxidants into amino phenolic antioxidants with improved compatibility. This structural modification changes the chemical parameters of the antioxidant molecule, enabling it to function effectively in biodiesel and biolubricant systems without compromising combustion, lubricity, or flow properties while maintaining oxidation stability enhancement
2Reliability
If conventional antioxidants are used at elevated concentrations to control oxidation, then oxidation stability is improved, but combustion, lubricity, and flow properties are compromised
Solution Approach 1:
The patent uses parameter changes by altering the chemical structure of the antioxidant through N-alkylation, which enables the amino phenolic antioxidant to achieve effective oxidation protection at lower concentrations. This structural modification changes the effectiveness parameter of the antioxidant, allowing it to protect biodiesel and biolubricants from oxidation while maintaining combustion efficiency and avoiding the need for high concentrations that would compromise productivity
Solution Approach 2:
The patent creates a composite antioxidant structure by combining phenolic groups with N-alkylated glycidyl ether groups, forming an amino phenolic antioxidant with dual functionality. This composite molecular structure integrates the oxidation protection capability of phenolic groups with the compatibility and performance-enhancing properties of N-alkylated side chains, enabling effective antioxidant activity at low concentrations without compromising combustion properties
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 oxygenated aminophenol antioxidants significantly prolong the induction time in oxidation stability tests, outperforming comparative antioxidants, and provide improved oxidation stability, reducing sedimentation and corrosion in biodiesel engines, while maintaining the properties of biodiesel and biolubricants.
Implementation Method 1
inhibit oxidation of oxidizable compounds in natural oils or materials made therefrom, such as fuel and lubricant compositions like biodiesel and biolubricants
Implementation Method 2
These radicals promote free-radical chain reactions that cause the formation of oxidized chemical compounds of low molecular weight, like acids, aldehydes, and ketones
Data Source
AI summary
Compositions including a vegetable- or animal-derived oil, such as fatty acid alkyl esters, are stabilized against oxidation using an oxygenated aminophenol antioxidant. The aminophenol includes one or two carbon-containing group(s) including a hydroxyl group and/or ether group separated from the N atom by one or more carbon atoms. The oxygenated aminophenol antioxidants effective at controlling oxidation at moderate and even low amounts, useful in a variety of different oil and methyl ester fatty acid preparations, and were effective at elevated temperatures, and performed significantly better than convention antioxidants.