Modeling chemical kinetics of avocado oil ethanolysis catalyzed by solid glycerol-enriched calcium oxide

•Raw materials for biodiesel production can be obtained from the natural resources.•The glycerol-enriched CaO catalyst was tested for the ethanolysis of avocado oil.•CaO synthesized through the thermal treatment of Mytilus Galloprovincialis shells.•The ethanol-adsorption step controlled the overall ethanolysis process.•The physico-chemical properties of avocado oil and FAEEs is presented.