Obtenção de biodiesel por transesterificação em dois estágios e sua caracterização por cromatografia gasosa: óleos e gorduras em laboratório de química orgânica

• Main Authors: Diogo Müller de Oliveira, Diego Paulo Ongaratto, Luiz Antonio Mazzini Fontoura, Fabrício Fredo Naciuk, Vinícius Oliveira Batista dos Santos, Jéssica Danieli Kunz, Marcelo Volpatto Marques, Alexander Ossanes de Souza, Claudio Martin Pereira de Pereira, Dimitrios Samios
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2013-01-01
• Series: Química Nova
• Subjects: biodiesel; chromatography; oils and fats
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000500021&lng=en&tlng=en
• ISSN: 1678-7064

Methanolic transesterification of oils and fats was carried out in a two steps procedure, under basic and acidic catalysis. Palm, soybean, canola, corn, rice, grapeseed, sunflower, peanut, pequi and olive oils, besides tallow and lard were used as feedstock. Specific gravity, relative viscosity, thin layer chromatography and gas chromatography were used to characterize the biodiesel. Biodiesel was obtained in high yield and purity. Results were used to discuss the following key-concepts: 1 - triglycerides, composition and properties; 2 - nucleophilic acyl substitution under basic and acid conditions, 3 - thin layer chromatography, 4 - gas chromatography and its quantitative methods.