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Previous issue date: 2017-09-01 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / No contexto energ?tico mundial, o biodiesel tem despontado como uma importante fonte de energia renov?vel, sobretudo devido ? facilidade de produ??o do mesmo e ? variedade de mat?ria-prima dispon?vel mundialmente. Especificamente no Brasil, a ind?stria de biodiesel tem apresentado importante crescimento de produ??o, tendo em vista as leis federais que obrigam a mistura do B100 (biodiesel) ao diesel f?ssil. Diante da import?ncia desta ind?stria para o Brasil, este trabalho buscou avaliar o potencial do ?leo de sementes de algod?o para a produ??o de biodiesel a partir de tr?s t?cnicas: transesterifica??o, utilizando etanol, interesterifica??o, usando acetato de metila, e interesterifica??o, com acetato de metila e adi??o de solu??o aquosa de ?cido ac?tico. As rea??es ocorreram em condi??es supercr?ticas, em reator tubular de fluxo cont?nuo com volume de 15 mL. O rendimento m?ximo obtido pela transesterifica??o foi de 75,05%, na press?o de 150 e 200 bar, 375 ?C, raz?o molar ?leo/etanol 1:40, e tempos espaciais 40 min (150 bar) e 30 min (200 bar). J? na rota utilizando acetato de metila, o maior rendimento foi de 99,51% (?steres met?licos de ?cidos graxos + triacetina), obtido em 35 min, raz?o m?ssica ?leo/acetato de metila 1:3, press?o 200 bar e 350 ?C, utilizando 20%, em massa, de solu??o aquosa de ?cido ac?tico com concentra??o de 26%. Foram observados elevados valores de decomposi??o do biodiesel, em ambas as rotas, devido ?s altas concentra??es de triglicer?deos poliinsaturados no ?leo e ?s severas condi??es do processo. / In the global energy context, biodiesel has emerged as an important source of renewable energy, mainly due to its ease of production and the variety of raw material available worldwide. Specifically in Brazil, the biodiesel industry has shown significant production growth, due to the federal laws that require the mixing of B100 (biodiesel) with fossil diesel. Considering the importance of this industry to Brazil, this work sought to evaluate the potential of cotton seed oil for the production of biodiesel from three techniques: transesterification using ethanol, interesterification using methyl acetate and interesterification with methyl acetate and addition of aqueous acetic acid solution. The reactions occurred under supercritical conditions in a continuous flow tubular reactor with a volume of 15 mL. The maximum yield obtained by transesterification was 75.05%, at 150 and 200 bar pressure, 375 ?C, 1:40 oil/ethanol molar ratio, and spatial times 40 min (150 bar) and 30 min (200 bar). In the other method, using methyl acetate, the highest yield was 99.51% (methyl esters of fatty acids+ triacetin) obtained in 35 min, oil/methyl acetate ratio 1:3, pressure 200 bar and 350 ?C, using 20%, by mass, of aqueous acetic acid solution with a concentration of 26%. High values of biodiesel decomposition were observed in both routes due to the high concentrations of polyunsaturated triglycerides in the oil and the severe process conditions.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24506 |
| Date | 01 September 2017 |
| Creators | Azev?do, Saulo Henrique Gomes de |
| Contributors | 29171156453, Jesus, Anderson Alles de, 00167242598, Medeiros, Gilson Gomes de, 19989849404, Ferreira, Marcionila de Oliveira, 02933443457, Carvalho, Ricardo Henrique Rocha de, 03633886486, Oliveira, Humberto Neves Maia de, Sousa, Elisa Maria Bittencourt Dutra de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA QU?MICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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