EPA Ethyl Ester Purification via Molecular Distillation and Chromatography
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Solution Overview
Problem
Current methods for producing high-purity eicosapentaenoic acid (EPA) ethyl ester from sardine oil face challenges such as low bleaching efficiency, color reversion during esterification, and the use of toxic reagents or metal ions, resulting in EPA purity limited to around 80% and safety concerns with genotoxic by-products.
Innovation Solution
A multi-stage molecular distillation process combined with degumming, deacidification, esterification, winterization, and chromatographic purification, using vacuum distillation and liquid chromatography to enrich EPA, avoiding the use of toxic reagents and metal ions, and achieving high EPA purity through controlled distillation temperatures and scraper speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If activated white clay is used for bleaching sardine oil, then the oil is purified, but a large amount of fish oil is adsorbed resulting in low bleaching efficiency
Solution Approach 1:
The patent removes activated white clay from the bleaching process entirely and replaces it with molecular distillation technology. This extraction of the harmful element (white clay) eliminates the adsorption problem while achieving purification through vacuum distillation that separates components based on volatility differences without material loss.
Solution Approach 2:
The patent replaces the chemical adsorption mechanism of activated white clay with a physical separation mechanism using molecular distillation. The molecular distillation system uses vacuum conditions and controlled temperature to separate fish oil components based on their molecular weight and volatility, substituting chemical interaction with physical phase separation.
2Productivity
If high temperature and NaOH are used during esterification, then esterification reaction proceeds, but fish oil color reversion occurs
Solution Approach 1:
The patent changes the temperature parameter from high temperature conventional esterification to low temperature enzyme-catalyzed esterification. By using lipase enzymes that operate optimally at lower temperatures, the process achieves effective esterification while avoiding the thermal degradation that causes color reversion in fish oil.
Solution Approach 2:
The patent introduces enzyme catalyst (lipase) as an intermediary substance to facilitate the esterification reaction. The enzyme acts as a biological mediator that enables the reaction to proceed efficiently at lower temperatures, replacing the need for high temperature and strong base (NaOH) conditions that cause harmful color changes.
3Quantity of substance
If traditional purification methods (urea inclusion or molecular distillation) are used, then EPA can be concentrated, but purity is limited to around 80% and toxic by-products may form
Solution Approach 1:
The patent divides the purification process into multiple sequential stages: first-stage molecular distillation to remove high volatility impurities, second-stage molecular distillation to further concentrate EPA, and finally liquid chromatography for high-resolution separation. This segmentation of the purification process into distinct stages with different separation mechanisms achieves over 95% purity, overcoming the limitation of single-stage methods.
Solution Approach 2:
The patent combines multiple purification technologies (molecular distillation and liquid chromatography) into a composite purification system. By integrating these different separation methods that operate on different principles (volatility-based and polarity-based separation), the system achieves superior purity levels that neither method could achieve alone, eliminating the need for urea inclusion that produces toxic by-products.
4Manufacturing precision
If multiple purification methods are combined, then EPA purity can be improved, but the process becomes complex and may involve toxic reagents
Solution Approach 1:
The patent changes the fundamental operating parameters of the purification process by using vacuum conditions and controlled temperature gradients throughout the molecular distillation stages. This parameter control allows for selective separation of components based on their physical properties, achieving high purity through physical separation rather than chemical treatment, thereby simplifying the overall process while maintaining effectiveness.
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
This method effectively enriches EPA to a purity of 95% or higher, improving the utilization rate of sardine oil and avoiding the drawbacks of traditional bleaching agents, while ensuring the safety and efficiency of the EPA ethyl ester production process.
Implementation Method 1
performing a first-stage distillation on the heavy phase components obtained in the step (3) in a molecular distiller with a distillation temperature in a range of 70 ̃80° C. and a distillation pressure of 0.1 Pa
Implementation Method 2
purifying the third-stage heavy phase components collected in the step (6) by using a liquid chromatograph to collect a fraction in each of minutes under respective EPA peaks
Implementation Method 3
removing a solvent of the fraction collected in each of the minutes through vacuum distillation
Data Source
AI summary
A preparation method of eicosapentaenoic acid (EPA) ethyl ester is provided and relates to the field of EPA ethyl ester processing technologies. The preparation method includes: performing degumming and deacidification on a sardine crude oil to obtain a semi-refined sardine oil, performing esterification on the semi-refined sardine oil to obtain an esterified sardine oil and then performing winterization on the esterified sardine oil to thereby obtain an semi-refined esterified sardine oil, performing bleaching and deodorization on the semi-refined esterified sardine oil, and performing multi-stage distillation treatment. Finally, the sardine oil is purified by liquid chromatography to obtain the high purity EPA ethyl ester. The preparation method can improve a utilization rate of the sardine oil and obtain the high-purity EPA ethyl ester.