This study analyzes kinetics of biodiesel transesterification using waste cooking oil as feedstock with a Deep Eutectic Solvent (DES) catalyst based on K₂CO₃–glycerol. The transesterification process was carried out at catalyst concentrations of 4,5%, 5,5% and 6,5% (w/w oil) and reaction temperatures of 45°C, 55°C and 65°C for 4 hours. The biodiesel properties analyzed included viscosi…