Supercritical CO2 Lipid Extraction from Microalgae
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Solution Overview
Problem
Microalgae lipid extraction is hindered by inefficient light utilization leading to slow cell growth and high production costs, with conventional solvents being detrimental to the environment and energy-intensive to recycle.
Innovation Solution
The process involves using liquid or supercritical carbon dioxide at specific conditions, optionally with a porous inorganic matrix or polymer coating, and photosensitive additives to enhance extraction efficiency while minimizing cellular damage and allowing continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic solvents are used for lipid extraction, then extraction efficiency is improved, but environmental harm increases and energy consumption for solvent recycling increases
Solution Approach 1:
The patent changes the physical state and parameters of the extraction medium from conventional organic solvents to supercritical carbon dioxide by adjusting temperature and pressure parameters. This transformation maintains extraction efficiency while eliminating environmental harm associated with organic solvent disposal and recycling
Solution Approach 2:
The patent utilizes the phase transition properties of carbon dioxide between supercritical and gaseous states. By controlling pressure and temperature, CO2 transitions to a supercritical state for extraction, then returns to gaseous state for easy separation, eliminating the need for energy-intensive solvent recycling processes
2Productivity
If conventional organic solvents are used for lipid extraction, then extraction efficiency is improved, but energy consumption for solvent recycling increases
Solution Approach 1:
The patent exploits the phase transition of CO2 from supercritical to gaseous state by simply reducing pressure, eliminating the need for energy-intensive distillation or evaporation processes required for organic solvent recovery. The CO2 naturally transitions back to gas phase and can be directly vented or recycled without additional energy input
Solution Approach 2:
The patent treats CO2 as a disposable extraction medium that can be used once and then easily vented or recycled without the need for complex recovery systems. This approach eliminates the energy burden of solvent recycling infrastructure
3Productivity
If extraction pressure is increased to improve lipid extraction efficiency, then extraction rate increases, but cellular destruction increases
Solution Approach 1:
The patent optimizes the pressure parameter within a specific range (7.3-30 MPa) to achieve effective lipid extraction while minimizing cellular destruction. This controlled parameter change allows sufficient CO2 penetration into cells for efficient extraction without causing excessive mechanical damage to cell structures
Solution Approach 2:
The patent introduces a porous inorganic matrix as an intermediary medium that facilitates lipid extraction by providing a controlled interface between CO2 and cells. This matrix acts as a mediator that enhances extraction efficiency while protecting cells from direct high-pressure damage
4Productivity
If microalgae biomass concentration is increased to improve productivity, then lipid production increases, but light penetration efficiency decreases
Solution Approach 1:
The patent replaces the natural light-dependent growth mechanism with a mechanical/physical extraction process using supercritical CO2. This substitution allows high biomass concentration to be maintained without the light penetration limitations that constrain photosynthetic efficiency in dense cultures
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 extracts lipids with reduced cellular destruction, uses an environmentally benign solvent, and allows for continuous operation, improving productivity and reducing environmental impact.
Implementation Method 1
The present invention relates to a process for extracting lipids form living cells utilizing liquid CO2. The extraction may be made continuous and the release of CO2 pressure may be sequenced to reduce cellular destruction.
Implementation Method 2
extracting said lipids from said cells with liquid and/or supercritical carbon dioxide medium
Implementation Method 3
The cells may be coated with a porous inorganic material such as a silica gel coating or a porous hydrophilic polymer
Implementation Method 4
One may also treat the living cells with a photosensitive material to promote cellular photosynthesis
Data Source
AI summary
A process for the extraction of lipids from living cells utilizing liquid carbon dioxide optionally in the presence of a porous inorganic matrix or polymer coating as well as additional solvents to improve extraction efficiency. The cells may also optionally be treated a photosensitive material to promote cellular photosynthesis.