EPA Alkyl Ester Purification via Silver Salt Extraction
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Solution Overview
Problem
Conventional methods for producing EPA-containing compositions result in unnoticed impurities, specifically novel EPA analogs, which are difficult to remove due to their close chemical similarity to EPA, leading to impurities being present in the final product.
Innovation Solution
A method involving bringing a raw oil containing EPA alkyl ester into contact with an aqueous solution of silver salt, followed by extraction with an organic solvent and subsequent vacuum distillation at specific temperature and vacuum conditions to recover high-purity EPA alkyl ester.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional vacuum distillation methods are used to produce EPA-containing compositions, then the production process is simple and efficient, but the product contains unnoticed impurities (novel EPA analogs) that are difficult to remove
Solution Approach 1:
The patent introduces an intermediary substance (specific reagent or adsorbent material) that selectively binds to or reacts with the novel EPA analog impurities, enabling their removal without affecting the main EPA product. This intermediary acts as a mediator between the impurity removal goal and the preservation of EPA integrity, solving the contradiction by adding a targeted purification step that doesn't require complete process redesign
Solution Approach 2:
The patent modifies specific process parameters such as temperature, pressure, or chemical environment during the distillation or purification stage to enhance the separation between EPA and the novel EPA analog impurities. By changing parameters like distillation temperature gradients, vacuum pressure levels, or pH conditions, the method achieves better purity without fundamentally complicating the overall process flow
2Manufacturing precision
If multiple purification steps are added to remove impurities, then the purity of EPA-containing composition is improved, but the production cost and process complexity increase
Solution Approach 1:
The patent performs preliminary purification actions early in the process chain, such as pre-treatment of the raw oil or preliminary removal of major impurity classes before the main distillation step. This preliminary action reduces the burden on subsequent purification steps, achieving high overall purity with less complex final processing and lower cumulative costs
Solution Approach 2:
The patent employs a purification method where impurities are selectively discarded through targeted removal steps, while the main EPA product is recovered and retained. The process is designed to discard only the necessary minimal amount of material (the novel EPA analogs) while maximizing EPA recovery, thereby maintaining ease of manufacture through efficient material utilization rather than requiring multiple redundant purification stages
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 method achieves a high-concentration, high-purity EPA-containing composition with significantly reduced levels of impurities, including unnoticed EPA analogs, making it suitable for use in pharmaceuticals and health foods.
Implementation Method 1
bringing a raw oil containing an eicosapentaenoic acid alkyl ester into contact with an aqueous solution containing a silver salt
Implementation Method 2
adding an organic solvent to the aqueous layer, and then collecting an organic solvent layer
Implementation Method 3
subjecting the organic solvent layer to vacuum distillation at a temperature of 180 to 188° C. and a tower top vacuum degree of 0.7 Pa or below
Data Source
AI summary
Provided is a high-concentration and high-purity eicosapentaenoic acid-containing composition. A method for producing an eicosapentaenoic acid alkyl ester-containing composition, the method includes: (1) bringing a raw oil that contains an eicosapentaenoic acid alkyl ester into contact with an aqueous solution that contains a silver salt, and then collecting an aqueous layer; (2) adding an organic solvent to the aqueous layer, and then collecting an organic solvent layer; and (3) subjecting the organic solvent layer to vacuum distillation at a temperature of 180 to 188° C. and a tower top vacuum degree of 0.7 Pa or below, to recover the eicosapentaenoic acid alkyl ester from the organic solvent layer.