Noncatalytic transformation of the crude lipid of ChlorellaI vulgaris into fatty acid methyl ester (FAME) with charcoal via a thermo-chemical process

► Thermo-chemical process for transforming the crude lipid into biodiesel. ► Enhanced conversion efficiency using CO2 as a reaction medium. ► Noncatalytic biodiesel conversion under ambient pressure. ► High tolerance for water and impurities of the crude of microalgal lipid.