Continuous lipid extraction of microalgae using high-pressure carbon dioxide.

Area of Science:

• Biotechnology
• Chemical Engineering
• Sustainable Energy

Background:

• Microalgae offer potential for carbon sequestration, water purification, and biofuel production.
• Current algal oil extraction methods are energy-intensive, hindering commercial viability.
• Existing high-pressure CO2 extraction methods often use batch processes and co-solvents, requiring optimization.

Purpose of the Study:

• To develop and evaluate a continuous high-pressure carbon dioxide (CO2) extraction system for microalgal oil.
• To identify optimal parameters for maximizing extraction efficiency and yield.
• To address the energy consumption challenges in microalgae-based biofuel production.

Main Methods:

• Fabrication of a continuous high-pressure CO2 extraction system.
• Systematic evaluation of extraction parameters including temperature, pressure, pretreatment, co-solvent ratio, and species.
• Integration of optimal parameters for a 5-day continuous operation test.

Main Results:

• The continuous system demonstrated stable and high extraction yields.
• Achieved a 90.56% oil extraction yield ratio, significantly outperforming traditional solvent extraction.
• Optimized parameters led to efficient microalgal oil recovery.

Conclusions:

• The developed continuous high-pressure CO2 extraction system is effective for microalgal oil extraction.
• This method offers a promising, energy-efficient alternative for the biofuel industry.
• The system's stability and high yield support its potential for commercial application.