Fatty Acid Butyl Ester Blends for Cold Flow
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Solution Overview
Problem
Current biodiesel fuels face challenges with cold flow properties, as they tend to freeze in cold climates and have poor ignition quality due to high levels of unsaturated fatty acids, which can lead to polymerization and deposit formation, compromising lubrication and engine performance.
Innovation Solution
A blend of fatty acids with a balanced composition of medium chain fatty acids (C8, C10, C12) and monounsaturated fatty acids (C16:1, C18:1), with reduced levels of saturated fatty acids like C16:0, C18:0, C18:2, C18:3, C20, C22, and C24, is used to create biodiesel blends that are converted into n-butyl esters, enhancing cold weather capabilities and ignition quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vegetable oils with high unsaturated fatty acid content are used as biodiesel feedstocks, then ignition quality improves, but cold flow properties deteriorate due to polymerization and deposit formation
Solution Approach 1:
The patent changes the chemical parameters of the biodiesel by using fatty acids with specific chain lengths (C8-C18) and controlled unsaturation levels. This parameter optimization allows the fuel to achieve both good ignition quality and acceptable cold flow properties by balancing saturation and chain length characteristics.
Solution Approach 2:
The invention creates a composite fatty acid blend combining saturated and monounsaturated fatty acids in specific proportions. This composite approach allows the fuel to exhibit properties of both saturated fats (better cold flow) and unsaturated fats (better ignition quality), resolving the contradiction between these two performance aspects.
2Object-affected harmful factors
If saturated fatty acids are increased to improve cold flow properties, then melting point increases, but ignition quality deteriorates
Solution Approach 1:
The patent optimizes the chain length parameter of saturated fatty acids to C8-C12 range, which has lower melting points compared to conventional C16-C18 saturated fats. This parameter change allows improved cold flow properties while maintaining adequate ignition quality through the balanced blend formulation.
3Object-affected harmful factors
If medium and long-chain triglycerides are reduced to improve cold flow, then fuel efficiency may be compromised
Solution Approach 1:
The invention changes the chain length distribution parameter by focusing on C8-C12 medium-chain fatty acids rather than reducing all medium and long-chain triglycerides. This selective parameter optimization maintains adequate energy content for fuel efficiency while achieving improved cold flow properties through the specific chain length range.
Data Source
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AI summary
Provided herein are blends oils or fatty acids comprising more than 50% medium chain fatty acids, or the fatty acid alkyl esters thereof, and having low melting points. Such blends are useful as a fuel or as a starting material for the production of, for example, a biodiesel. Also provided genetically altered or modified plants, modified such that the amount of medium chain fatty acids generated by the plant are increased. Further provided is a method of predicting the melting point of a blend of fatty acid methyl esters and the use of such a method for identifying blends suitable for use as, for example, a biodiesel.