Biofuel Estolide and Ether Ester Molecular Design for Cold Flow
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Solution Overview
Problem
Alkyl mono-esters of fatty oils used as biofuels face challenges with cold flow properties and oxidation stability, despite proposed additives, which remain a concern.
Innovation Solution
The development of biofuels composed of esters formed through estolide reactions or alcoholysis over the double bond of unsaturated fatty acids, resulting in improved cold flow and oxidation stability, specifically using ether and estolide esters with specific molecular structures and reaction methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If alkyl mono-esters of fatty oils are used as biofuel, then the fuel can be produced and used as an alternative energy source, but the cold flow properties deteriorate at low temperatures
Solution Approach 1:
The patent changes the molecular structure parameters of the biofuel by forming estolide esters and ether esters with specific chain lengths and degrees of unsaturation. By controlling the carbon chain length (C15-C23) and introducing ether linkages, the fuel maintains energy density while improving cold flow properties through reduced pour point and better low-temperature fluidity.
Solution Approach 2:
The patent creates composite ester structures combining fatty acid chains with ether linkages and estolide formations. These composite molecular structures integrate the energy-dense fatty acid backbone with the flexible ether segments, achieving both high energy content and improved cold flow characteristics.
2Use of energy by moving object
If alkyl mono-esters of fatty oils are used as biofuel, then the fuel can serve as an alternative energy source, but oxidation stability deteriorates over time
Solution Approach 1:
The patent modifies the chemical composition parameters by forming estolide esters and ether esters with controlled degrees of unsaturation. The esterification reactions reduce the number of free double bonds available for oxidation, while maintaining the energy-dense hydrocarbon structure, thereby improving oxidation stability without sacrificing energy content.
3Reliability
If additives are proposed to improve cold flow and oxidation stability, then fuel performance may be enhanced, but the complexity of the fuel composition increases
Solution Approach 1:
The patent extracts and eliminates the need for separate oxidation stability additives by incorporating antioxidant functionality directly into the ester molecular structure. The estolide and ether ester formations create intrinsically more stable molecules that resist oxidation without requiring additional chemical additives.
Solution Approach 2:
The patent makes the ester molecules multi-functional by designing them to simultaneously provide energy content, cold flow properties, and oxidation stability. The estolide and ether ester structures perform multiple functions within a single molecular framework, eliminating the need for separate additives for each property.
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 biofuels exhibit enhanced cold flow properties and oxidation stability, making them suitable for use as diesel fuels with improved performance characteristics such as increased induction periods and reduced pour points.
Implementation Method 1
esters formed from the addition of a carboxylic acid via an estolide reaction over the double bond of unsaturated fatty acids
Implementation Method 2
esters formed from the addition of an alcohol via alcoholysis over the double bond of unsaturated fatty acids
Implementation Method 3
the carboxylic acid groups of the unsaturated starting material are esterified after the alcoholysis or estolide reaction
Data Source
AI summary
A biofuel containing an estolide ester, an ether ester, or a combination thereof. The estolide ester and ether ester can be of formula A:R1—CH(O—X)R2CO2R3 wherein R1 is an alkyl group having from 1 to 36 carbons, X is an alkyl group having from 1 to 10 carbons and preferably 1, 2, or 3 carbons or is an acyl group of formula COR5 where R5 is an alkyl group having 1 to 10 carbons and preferably 1, 2, or 3 carbons, R2 is an alkylene group or alkenylene group having from 1 to 36 carbons, and R3 is alkyl having 1 to 10 carbons and preferably 1, 2, or 3 carbons.