Simulated Moving Bed Chromatography for PUFA Purification
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Solution Overview
Problem
Current chromatographic techniques are inadequate for achieving high purity polyunsaturated fatty acid (PUFA) products from commercially available feedstocks like fish oils, as they are prone to degradation and contamination, and existing methods like distillation result in unacceptable product loss and impurity profiles.
Innovation Solution
A simulated or actual moving bed chromatographic separation process using an aqueous organic solvent eluent in multiple linked chromatography columns, with sequential or separate steps to effectively separate PUFAs from faster and slower running components, achieving high purity and low impurity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distillation is used to purify PUFAs, then purity can be improved, but product degradation occurs due to isomerization, peroxidation and oligomerization
Solution Approach 1:
The invention changes the separation parameter from thermal (distillation) to chromatographic (adsorption-based separation). By using simulated moving bed chromatography with specific stationary phases and mobile phases, PUFAs are separated based on their adsorption characteristics rather than volatility, eliminating thermal degradation while achieving high purity
Solution Approach 2:
The invention replaces the mechanical/thermal separation mechanism of distillation with a chemical/adsorption-based chromatographic system. The simulated moving bed apparatus uses countercurrent flow of adsorbent and mobile phase to achieve separation without thermal stress, substituting the distillation mechanism with a gentler chromatographic mechanism
2Manufacturing precision
If conventional stationary bed chromatography is used, then separation can be achieved, but productivity is low and multiple columns are required
Solution Approach 1:
The invention transforms the static stationary bed chromatography into a dynamic simulated moving bed system. By periodically shifting the injection and collection points while maintaining countercurrent flow, the system achieves continuous separation with higher productivity, eliminating the need for multiple columns while improving both separation efficiency and process throughput
Solution Approach 2:
The simulated moving bed system enables continuous operation by maintaining constant countercurrent flow between the mobile phase and adsorbent. The periodic shifting of injection and collection points ensures uninterrupted separation, allowing the process to run continuously without the batch-wise operation limitations of conventional stationary bed chromatography
3Productivity
If PUFAs are heated in the presence of oxygen, then processing can be accelerated, but isomerization, peroxidation and oligomerization occur
Solution Approach 1:
The chromatographic separation process operates under ambient or controlled conditions without requiring heating in the presence of oxygen. The countercurrent chromatographic system achieves separation at lower temperatures, effectively creating an inert environment that prevents oxidative degradation and isomerization while maintaining processing efficiency
Solution Approach 2:
The invention replaces thermal processing mechanisms with chromatographic separation mechanisms. Instead of using heat to accelerate processing, the system uses the differential adsorption properties of PUFAs on the stationary phase combined with countercurrent mobile phase flow, achieving both speed and purity without thermal stress
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 process achieves high yield and purity of PUFA products with low levels of isomeric impurities, significantly improving upon conventional methods by maintaining the integrity of PUFAs and reducing contamination from distillation processes.
Implementation Method 1
simulated or actual moving bed chromatographic separation process
Implementation Method 2
a mixture whose components are to be separated percolates through a container. The container is generally cylindrical, and is typically referred to as the column. The column contains a packing of a porous material (generally called the stationary phase)
Data Source
AI summary
The present invention provides a chromatographic separation process for recovering a polyunsaturated fatty acid (PUFA) product from a feed mixture, which process comprises the steps of: (i) purifying the feed mixture in a first separation step in a simulated or actual moving bed chromatography apparatus having a plurality of linked chromatography columns containing, as eluent, an aqueous organic solvent, to obtain an intermediate product; and (ii) purifying the intermediate product obtained in (i) in a second separation step using a simulated or actual moving bed chromatography apparatus having a plurality of linked chromatography columns containing, as eluent, an aqueous organic solvent, to obtain the PUFA product; wherein (a) the first and second separation steps are carried out sequentially on the same chromatography apparatus, the intermediate product being recovered between the first and second separation steps and the process conditions in the chromatography apparatus being adjusted between the first and second separation steps such that the PUFA product is separated from different components of the feed mixture in each separation step; or (b) the first and second separation steps are carried out on separate first and second chromatography apparatuses respectively, the intermediate product obtained from the first separation step being introduced into the second chromatography apparatus, and the PUFA product being separated from different components of the feed mixture in each separation step.