With the reuse of residual frying oil in the biodiesel production chain, there is a need to increasingly improve studies on improving the quality of this waste. The main chemical components of vegetable oil and animal fats are esters of fatty acids with glycerol.Fatty acid is a carboxylic acid (COOH) with an aliphatic chain. They are considered organic components, or in other words, they contain carbon and hydrogen in their molecules. These acids are produced when fats are broken down. They are poorly soluble in water (the longer the carbon chain, the lower the solubility), and can be used as energy by cells. They are classified as monounsaturated, polyunsaturated, or saturated. To increase the quality of this residue, studies are being carried out in the face of physical-chemical characterisation, seeking better quality of its use. The transesterification and esterification process is mentioned.

IVAN LEITE MORENO, Chemotechniker, Bioenergie, Erfahrung im Öl- und Gasbereich, Laborunterkoordinator, Erfahrung in der Produktentwicklung. ANTONIO CESAR MACEDO BISPO, Hochschulabschluss in Bioenergie, Erfahrung in der Zucker- und Energieindustrie. MARCIO ADRIANO GIMENES, Hochschulabschluss in Bioenergie, Erfahrung in der Brauereiindustrie und Unternehmer.