Reações de oxidação de monoterpenos e esterificação de ácidos graxos catalisadas pelo ácido dodecafosfomolíbdico

• Ano de defesa: 2012
• Autor(a) principal: Xavier, Raquel da Silva
• Banca de defesa: Fernandes, Sergio Antônio , Queiroz, José Humberto de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Agroquímica
• Departamento: Agroquímica analítica; Agroquímica inorgânica e Físico-química; Agroquímica orgânica
• País: BR
• Palavras-chave em Português: Catalisadores; Monoterpenos; Esterificação; Ácidos graxos
• Palavras-chave em Inglês: Catalysts; Monoterpenes; Esterification; Fatty acids
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA
• Link de acesso: http://locus.ufv.br/handle/123456789/2150

Economics and environmental aspects have motivated mainly in the chemical industry to replace both the classic methods of oxidation and more recently esterification by processes environmentally benign and to reduce costs and to generate the least amount of by-products. Within this context, the development of more efficient catalysts is a necessaty. The main objective of this work was to apply the catalyst H3PMo12O40 in oxidation reactions of monoterpenes and esterification reactions of fatty acids for the production of biodiesel. Were performed oxidation reactions of camphene and limonene. For both reactios reaction parameters were studied the effect of concentration of hydrogen peroxide and the catalyst and the reaction time. The conversions were found above 50%. The products were identified for camphene was camphene glycol, hydroxy-acid camphene and aldehyde camphene, as for the products are epoxilimoneno limonene, and limonene carveol glycol. For the esterification of fatty acids catalytic tests were carried out eithen homogeneous and heterogeneous phase. Effects such as the nature of the fatty acid carbon chain alcohol and catalyst concentration are made in homogeneous phase. In all tests the catalyst was efficient and conversions were high in the corresponding esters. The heteropolyacid was impregnated in matrices silica, zirconia, and niobia and applied ethanolysis of oleic acid. Conversions had values above 85%.