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

• Autor(a) principal: Xavier, Raquel da Silva
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2150
• topic: Catalisadores; Monoterpenos; Esterificação; Ácidos graxos; Catalysts; Monoterpenes; Esterification; Fatty acids; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA INORGANICA

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%.