Fuente: WIPO "olive oil" A method of producing biodiesel using waste olive oil can include collecting an olive pulp; extracting olive oil from the olive oil pulp by soaking the olive oil pulp in a solvent to obtain an oil-solvent mixture; removing the solvent from the mixture through evaporation to provide olive oil and a residue pulp; separating the olive oil from the residue pulp; rinsing the residue pulp with deionized water; drying the residue pulp; sieving the dried residue pulp to obtain pulp particles; pyrolyzing the pulp particles to create a carbon powder; adding sulfuric acid to the carbon powder to obtain a mixture; stirring the mixture to obtain a solid; washing the solid with water until a pH of an effluent is neutral; drying the solid; obtaining a sulfonated olive carbon (SOC) catalyst; and using the sulfonated olive carbon (SOC) catalyst for transesterifying waste olive oil to biodiesel.