Desidrogenação parcial do óleo fúsel da cana de açúcar empregando hidrotalcita modificada com zinco como catalisador
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Data
2022-07-06
Autores
Lima, Lívia Padilha de
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Universidade Estadual Paulista (Unesp)
Resumo
Este trabalho teve por objetivo a desidrogenação parcial do óleo fúsel de cana de açúcar para a obtenção de produtos químicos utilizando uma fonte de carbono renovável. Para tanto foi sintetizado e caracterizado um catalisador a base de hidrotalcita substituindo 20% do Mg2+ por Zn2+ (Zn20HDL) e do seu respectivo óxido (Zn20OMM). Com o processo de desidrogenação inicia-se a condensação de Guerbet do óleo fúsel em misturas contendo metanol como reagente. O óleo fúsel foi escolhido como fonte de carbono dado sua larga produção na indústria sucroalcooleira como subproduto do processo de destilação do etanol, sendo, portanto, uma fonte de carbono renovável de baixo custo. Os materiais, HDL e OMM, foram caracterizados por difração de raios-X (DRX) e análise de área superficial (BET). As reações catalíticas foram conduzidas em reator de leito fixo de baixa pressão, gerando uma mistura de produtos dos quais podemos destacar aldeídos, olefinas, ésteres, éteres e compostos aromáticos, mostrando a versatilidade desta metodologia para obtenção de compostos orgânicos importantes para a indústria de química fina. A análise posterior dos catalisadores utilizados nas reações por termogravimetria (TGA) indicou que a principal fonte de desativação destes materiais foi a deposição de carbono sobre a superfície.
The main goal of this work was the partial dehydrogenation of fusel oil, obtained from sugarcane processing, to obtain chemical products using a renewable carbon source. Therefore, a hydrotalcite-based catalyst was synthesized and characterized, replacing 20 mol% of Mg2+ for Zn2+(Zn20HDL) and its respective oxide (Zn20OMM). The dehydrogenation process initiates the Guerbet Condensation of the fusel oil in mixtures containing methanol as co reagent. Fusel oil was chosen as a carbon source given its large production in the sugarcane alcohol industry, as a by-product of the ethanol distillation process, being, therefore, a low cost and a renewable carbon source. The materials, HDL and OMM, were characterized by X ray diffraction (XRD) and surface area analysis (BET) indicating the success in obtaining the materials. The catalytic reactions were carried out in a low pressure fixed bed reactor, generating a mixture of products which can highlight aldehydes, olefins, esters, ethers and aromatic compounds. It shows the versatility of this methodology for obtaining important organic compounds in the fine chemical industry, which are mostly obtained from non renewable sources. The subsequent analysis of the catalysts used in the reactions by thermogravimetric analysis (TGA) indicated that the main source of deactivation was the carbon deposition on the catalyst surface.
The main goal of this work was the partial dehydrogenation of fusel oil, obtained from sugarcane processing, to obtain chemical products using a renewable carbon source. Therefore, a hydrotalcite-based catalyst was synthesized and characterized, replacing 20 mol% of Mg2+ for Zn2+(Zn20HDL) and its respective oxide (Zn20OMM). The dehydrogenation process initiates the Guerbet Condensation of the fusel oil in mixtures containing methanol as co reagent. Fusel oil was chosen as a carbon source given its large production in the sugarcane alcohol industry, as a by-product of the ethanol distillation process, being, therefore, a low cost and a renewable carbon source. The materials, HDL and OMM, were characterized by X ray diffraction (XRD) and surface area analysis (BET) indicating the success in obtaining the materials. The catalytic reactions were carried out in a low pressure fixed bed reactor, generating a mixture of products which can highlight aldehydes, olefins, esters, ethers and aromatic compounds. It shows the versatility of this methodology for obtaining important organic compounds in the fine chemical industry, which are mostly obtained from non renewable sources. The subsequent analysis of the catalysts used in the reactions by thermogravimetric analysis (TGA) indicated that the main source of deactivation was the carbon deposition on the catalyst surface.
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Palavras-chave
Óleo fúsel, Desidrogenação, Reação de Guerbet, Química verde, Fusel oil, Dehydrogenation, Guerbet reaction, Renewable carbono source