426714 Direct Biodiesel Production from Harvested Microalgae Via in Situ Transesterification Using Hydrochloric Acid

Wednesday, November 11, 2015: 1:45 PM
257B (Salt Palace Convention Center)
Bora Kim, Chemical & Biomolecular, KAIST, Daejeon, South Korea, Hanjin Im, Chemical & Biomolecular Engineering, KAIST, Daejeon, South Korea and Jae W. Lee, Chemical & Biomolecular Eng, KAIST, Daejeon, South Korea

This work presented in situ transesterification that is a combined process of lipid extraction and transesterification reaction using a homogeneous catalyst of hydrochloric acid (HCl) from wet microalgae. In situ transesterification was performed by heating the mixture of wet algal cells, HCl, methanol, and solvent in a single pot, leading to the yield of biodiesel, fatty acid methyl ester (FAME), over 90 % at 95 oC. The effects of reaction variables such as reaction temperature, amounts of catalyst, reactant, and solvent, and type of solvents on the yield were investigated. Using HCl as a catalyst for in situ transesterification is more beneficial than using H2SO4 because the FAME yield is less affected by moisture contents even higher than 80 %, and less amounts of catalyst and solvent are required in the HCl case. For the same molar amount of the two catalysts, HCl showed 15 wt. % higher FAME yield than H2SO4. This talk will show various sensitivity results of in-situ transesterification to produce biodiesel directly from wet microalgae using HCl as a catalyst.

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See more of this Session: Advances in Algal Biorefineries II
See more of this Group/Topical: Sustainable Engineering Forum