Highly efficient enzymatic biodiesel production promoted by particle-induced emulsification

Area of Science:

• Biocatalysis
• Renewable Energy
• Green Chemistry

Background:

• Traditional biodiesel production relies on chemical catalysts.
• Lipase-catalyzed processes offer advantages like mild conditions and feedstock flexibility.
• Improving enzymatic process efficiency is key for large-scale biodiesel production.

Purpose of the Study:

• To optimize a two-phase lipase-catalyzed system for efficient biodiesel synthesis.
• To investigate the impact of various parameters on biodiesel yield and reaction rate.
• To enhance the enzymatic conversion of oils with high free fatty acid content.

Main Methods:

• Development of a two-phase enzymatic system using Thermomyces lanuginosus lipase.
• Optimization of biocatalyst composition, ethanol concentration, and additives.
• Utilizing silica particles to improve mass transfer and reaction kinetics.
• Application of optimal conditions to solvent-free ethanolysis of rapeseed oil.

Main Results:

• High enzyme tolerance to ethanol concentrations enabled high conversions.
• Silica particles significantly increased reaction rates by reducing emulsion droplet size and enhancing mass transfer.
• Optimal conditions yielded 96% biodiesel from rapeseed oil in 5 hours.
• Enzymatic process outperformed chemical catalysts under mild conditions.

Conclusions:

• Triacylglycerol oils with high free fatty acid content can be efficiently converted to ethyl esters using Thermomyces lanuginosus lipase.
• Silica particles facilitate faster mass transfer, leading to a more efficient enzymatic biodiesel production process.
• The developed system achieves near-quantitative yields due to high ethanol tolerance of the lipase.