Triglyceride Conversion of Waste Frying Oil up to 98.46% Using Low Concentration K/CaO Catalysts Derived from Eggshells.

In this study, biodiesel, also known as fatty acid methyl ester (FAME), was synthesized from multi-stage frying waste soybean oil using chicken eggshell-derived CaO and potassium-impregnated K-CaO heterogeneous catalysts. Potassium-impregnated catalysts (1.25% K-CaO, 2.