Biodiesel production from rapeseed oil by various supercritical carboxylate esters

► Rapeseed oil is converted to biodiesel by various supercritical carboxylate esters. ► Instead of glycerol, various triacins are formed as the by-product. ► The highest biodiesel yield is from supercritical methyl acetate treatment. ► Longer alkyl and/or acyl moieties of carboxylate esters result in lower yield. ► Mixtures of FAAE and triacin give no negative effects on fuel properties.