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Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass
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Ferric chloride based downstream process for microalgae based biodiesel production.

Yeong Hwan Seo1, Mina Sung1, Bohwa Kim2

  • 1Department of Civil and Environmental Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.

Bioresource Technology
|February 4, 2015
PubMed
Summary
This summary is machine-generated.

Ferric chloride (FeCl3) streamlines microalgae biodiesel production by aiding harvesting, lipid extraction, and esterification. This approach enhances efficiency and significantly reduces costs for microalgae-originated biodiesel.

Keywords:
Esterification using alkaline catalystFenton-like reactionFerric chlorideHarvestingLipid extraction

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Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Renewable Energy

Background:

  • Microalgae are a promising source for biodiesel production.
  • Downstream processing, including harvesting, lipid extraction, and esterification, presents significant cost challenges.
  • Efficient and cost-effective methods are needed to optimize microalgae-to-biodiesel conversion.

Purpose of the Study:

  • To investigate the use of ferric chloride (FeCl3) as an integrated agent in microalgae downstream processing.
  • To evaluate the efficacy of FeCl3 in microalgae harvesting, lipid extraction, and esterification.
  • To assess the potential of FeCl3 to reduce the overall production cost of microalgae biodiesel.

Main Methods:

  • Ferric chloride (FeCl3) was employed for microalgae harvesting, achieving coagulation at 200 mg/L and pH 3.
  • A Fenton-like reaction using FeCl3 and hydrogen peroxide (H2O2) was utilized for lipid extraction from microalgal biomass.
  • FeCl3 was used as an acidic catalyst for the esterification of free fatty acids to fatty acid methyl esters.

Main Results:

  • FeCl3 facilitated microalgae harvesting, increasing cell density by tenfold.
  • Lipid extraction efficiency reached 80% using FeCl3 with 0.5% H2O2 at 90 °C.
  • Esterification efficiency exceeded 90% with FeCl3, avoiding saponification issues common with alkaline catalysts.

Conclusions:

  • Ferric chloride (FeCl3) is a beneficial agent for multiple downstream processing steps in microalgae biodiesel production.
  • The use of FeCl3 integrates harvesting, lipid extraction, and esterification, simplifying the process.
  • FeCl3 demonstrates significant potential for cost reduction in the commercial production of microalgae-originated biodiesel.