Microbial PUFA Oil Extraction via Dewatering and Demulsification
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Solution Overview
Problem
The existing methods for extracting polyunsaturated fatty acids (PUFAs) from microbial cells are energy-intensive, costly, and environmentally harmful, often requiring heat, solvents, and chemicals that degrade the oil and increase processing costs.
Innovation Solution
A method involving dewatering the fermentation broth to reduce its volume by 60-80% and heating it to 60-110°C to enhance demulsification, followed by solventless extraction, which reduces processing time and energy use while maintaining oil quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If heat is used to dry the cells, then oil extraction efficiency is improved, but oil quality deteriorates due to degradation and oxidation
Solution Approach 1:
The invention changes the temperature parameter from high heat drying to low-temperature demulsification (60-110°C), which maintains oil quality while still enabling effective extraction. This parameter modification resolves the contradiction between extraction efficiency and oil quality preservation.
2Productivity
If organic solvents are used to recover PUFA oil, then oil recovery efficiency is improved, but processing cost and environmental impact increase
Solution Approach 1:
The invention extracts and removes the harmful organic solvent component from the process entirely, replacing it with a solvent-free demulsification method. This eliminates the need for energy-intensive solvent recovery while maintaining effective oil extraction through thermal demulsification and centrifugation.
3Productivity
If chemicals and enzymes are used to break cells and emulsions, then cell lysis efficiency is improved, but processing cost and waste disposal cost increase
Solution Approach 1:
The invention enables the fermentation broth to self-demulsify through controlled heating (60-110°C), where the emulsion breaks down naturally without requiring external chemicals or enzymes. This self-service approach eliminates costly additives and their associated waste disposal requirements.
4Productivity
If volume reduction is achieved through extensive dewatering, then demulsification efficiency is improved, but energy consumption increases
Solution Approach 1:
The invention optimizes the dewatering parameter to achieve moderate volume reduction (less than 60% of original volume) rather than complete drying. This parameter optimization achieves sufficient demulsification efficiency while minimizing energy consumption, resolving the contradiction between efficiency and energy use.
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 increases oil recovery by 7-9% and reduces processing time and costs by minimizing the need for solvents and enzymes, resulting in a higher yield of high-quality PUFA-containing oil.
Implementation Method 1
demulsify the fermentation broth by heating to a temperature of 60° C. to 110° C.
Implementation Method 2
removing water from the fermentation broth wherein the volume of the fermentation broth containing lysed oleaginous microorganisms is less than 60% of its original volume
Data Source
AI summary
Disclosed herein are processes for obtaining a microbial oil comprising one or more polyunsaturated fatty acids (PUFAs) from one or more microbial cells by removing water from the cell fermentation broth or lysed cell composition before demulsification is conducted. Such process has the benefits of reduced demulsification time and reduced salt use. Further disclosed herein is microbial oil comprising one or more PUFAs that is recovered from microbial cells by the process described herein.