Improving the soluble lipase-catalyzed biodiesel production through a two-step hydroesterification reaction system

Area of Science:

• Biotechnology
• Chemical Engineering
• Sustainable Chemistry

Background:

• Enzymatic biodiesel synthesis using soluble lipases offers cost and sustainability advantages over immobilized forms.
• A major drawback is the extended reaction time required to achieve optimal yields.
• Developing faster, efficient enzymatic processes is crucial for broader adoption.

Purpose of the Study:

• To introduce and evaluate an innovative two-step hydroesterification reaction (TSHR) system for enzymatic biodiesel production.
• To enhance the reaction rate and overall efficiency of biodiesel synthesis using a novel soluble lipase (NS40116).
• To optimize key reaction parameters and assess their impact on yield and product quality.

Main Methods:

• Utilized a novel, low-cost soluble lipase (NS40116) in a two-step hydroesterification reaction (TSHR) system.
• Employed two central composite statistical designs to optimize reaction parameters for each step.
• Investigated the influence of water concentration, methanol-to-oil ratio, and lipase load on yield and acid value.

Main Results:

• Achieved a maximum fatty acid methyl ester yield of 97.1% within 8 hours of reaction.
• Optimized conditions included 8 wt% water, a 6.3:1 methanol-to-oil molar ratio, and 0.70 wt% lipase.
• Statistical models for both reaction steps were found to be significant with 95% reliability.
• The resulting acid value was 4.62 mg KOH g^-1.

Conclusions:

• The proposed TSHR system significantly accelerates enzymatic biodiesel production compared to conventional one-step methods.
• This approach offers a promising, efficient, and sustainable alternative for industrial-scale enzymatic biodiesel synthesis.
• The optimization using statistical design validates the effectiveness of the TSHR system for high-yield biodiesel production.