Biodiesel Blend Composition for Cold Flow and Stability
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Solution Overview
Problem
Current biodiesel fuels face challenges in cold flow properties, stability, and ignition quality due to the composition of fatty acid chains, particularly the presence of long-chain unsaturated fatty acids which can lead to polymerization and deposits, and the need for improved cold weather performance.
Innovation Solution
Blending vegetable oils with specific ratios of medium chain fatty acids (C8, C10, C12) and monounsaturated fatty acids (C16:1, C18:1) to reduce the levels of C16:0, C18:0, C18:2, C18:3, C20, C22, and C24, resulting in a biodiesel with improved cold flow properties and stability, achieved through the conversion of triglycerides to fatty acid alkyl esters like methyl esters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If long-chain unsaturated fatty acids (C18:2, C18:3, C20, C22, C24) are present in biodiesel, then energy content is improved, but polymerization and deposit formation occur leading to reduced stability
Solution Approach 1:
The patent changes the fatty acid composition parameters by reducing long-chain unsaturated fatty acids (C18:2, C18:3, C20, C22, C24) to below 10% total and increasing medium-chain saturated fatty acids (C8, C10, C12) to 60-85% total. This parameter optimization prevents polymerization and deposit formation while maintaining energy content through the balanced composition.
2Reliability
If saturated fatty acids (C16:0, C18:0) are increased to improve ignition quality, then cetane number is improved, but cold flow properties deteriorate
Solution Approach 1:
The patent optimizes the saturation level parameter by reducing saturated fatty acids (C16:0, C18:0) to less than 20% total, which maintains adequate ignition quality while significantly improving cold flow properties. This is achieved by replacing saturated fats with medium-chain saturated fatty acids that have lower melting points.
Solution Approach 2:
The patent creates a composite fatty acid profile combining medium-chain saturated fatty acids (C8, C10, C12) with monounsaturated fatty acids (C16:1, C18:1). This composite composition achieves both good ignition quality and excellent cold flow properties by leveraging the complementary characteristics of different fatty acid types.
3Ease of operation
If medium chain fatty acids (C8, C10, C12) are increased to improve cold flow properties, then pour point is lowered, but production complexity increases
Solution Approach 1:
The patent changes the fatty acid chain length parameter by targeting medium-chain fatty acids (C8, C10, C12) that naturally occur in certain vegetable oils. By selecting feedstocks rich in these fatty acids and optimizing extraction parameters, the patent achieves low pour points without requiring complex synthetic production processes.
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 blended biodiesel exhibits enhanced cold weather capabilities, stability at higher temperatures, and improved ignition properties, making it suitable for use in internal combustion engines and as a feedstock for biofuels, with a predicted melting point algorithm to optimize blend composition.
Implementation Method 1
the conversion of triglycerides to fatty acid alkyl esters like methyl esters
Data Source
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AI summary
Provided herein are blends of 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 are genetically altered or modified plants, modified such that the amount of medium chain fatty acids generated by the plants are increased.