CO2-Expanded Alcohol Microalgae Lipid Extraction
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Solution Overview
Problem
Microalgae's tough cell walls hinder the extraction of valuable nutrients and lipids, making existing extraction methods inefficient and time-consuming.
Innovation Solution
A method and apparatus using a CO2-expanded alcohol solution at specific pressure and temperature ranges to enhance the extraction of nutrients and lipids from microalgae, facilitating faster and more efficient extraction by increasing the diffusion coefficient and reducing surface tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional extraction methods are used on microalgae, then the extraction process is simple, but the extraction rate is low and extraction time is long due to tough cell walls
Solution Approach 1:
The patent applies parameter changes by dissolving CO2 in liquid alcohol under specific pressure (400-1500 psi) and temperature (30-65°C) conditions to create a CO2-expanded alcohol solution. This changes the physical parameters of the extraction medium, increasing its diffusion coefficient and reducing surface tension, which enables rapid penetration through microalgae cell walls and achieves 5-fold higher extraction rates in significantly reduced time
Solution Approach 2:
The patent uses CO2 as an intermediary substance that dissolves in alcohol to form an expanded solution. This CO2-expanded alcohol solution acts as a mediator that enhances mass transfer and facilitates the extraction of lipids and nutrients from microalgae by improving the solvent's ability to penetrate cell walls and dissolve target compounds
2Productivity
If CO2-expanded alcohol solution is used for extraction, then extraction rate increases fivefold, but equipment complexity increases due to pressure and temperature control requirements
Solution Approach 1:
The patent employs pneumatic principles by using pressurized CO2 gas that dissolves in liquid alcohol to create the CO2-expanded solution. The system utilizes pressure regulation (400-1500 psi) and temperature control (30-65°C) to maintain CO2 in dissolved state, leveraging gas-liquid interaction to achieve enhanced extraction without requiring overly complex equipment
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 CO2-expanded alcohol solution increases lipid extraction rates up to fivefold compared to pure liquid alcohol, allowing for rapid and effective extraction of unsaturated and saturated fatty acids, which can be further processed into fatty acid esters for biodiesel production.
Implementation Method 1
pressurized CO2 is dissolved in a liquid alcohol to form a single-phase CO2-expanded alcohol solution
Implementation Method 2
a desired component such as for example a nutrient and/or a lipid is extracted from microalgae and dissolved into the CO2-expanded alcohol solution
Implementation Method 3
increasing the diffusion coefficient and reducing surface tension
Data Source
AI summary
A method and an apparatus of extracting lipids from microalgae are provided. In the method, pressurized carbon dioxide (CO2) is dissolved in a liquid alcohol to form a CO2-expanded alcohol solution at a pressure of about 400-1500 psi and a temperature of about 30-65° C. Next, the CO2-expanded alcohol solution contacts microalgae to extract the lipids from the microalgae. A method and an apparatus of preparing fatty acid esters from microalgae are disclosed as well.