Adsorptive pretreatment of waste cooking oil using quicklime for fatty acid methyl esters synthesis

Synthesis of biodiesel from various plant oils is realized by the transesterification triglycerides with methanol or a reaction usually defined as methanolysis. The usage low-quality oils, such waste cooking oil (WCO), followed undesirable side reactions result increased content free fatty acids (FFA), and water. presence FFA in WCO requires pretreatment stage before subjecting it to In present work, heterogeneously catalyzed methanolysis without was investigated. Removal conducted using only quicklime addition small amount (FFA = 1:3 molar ratio). obtained results showed that at 30 ?C after 1 h reduces 72 %, while adsorption capacity determined be 910 mg g-1. adsorptive pretreatment, simple operation, low-cost under mild conditions, had positive effect on rate CaO?ZnO catalyst, enabling achievement over 96 % yield 15 min, compared pretreatment. Furthermore, pretreated allows an increase repeated catalyst use overall savings necessary catalyst. study economic, environmental-friendly, sustainable material for removal WCO.