Detalhes bibliográficos
Ano de defesa: |
2014 |
Autor(a) principal: |
Santos, Roberta Menezes
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Orientador(a): |
Freitas, Lisiane dos Santos
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Banca de defesa: |
Não Informado pela instituição |
Tipo de documento: |
Dissertação
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Tipo de acesso: |
Acesso aberto |
Idioma: |
por |
Instituição de defesa: |
Não Informado pela instituição
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Programa de Pós-Graduação: |
Pós-Graduação em Química
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Departamento: |
Não Informado pela instituição
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País: |
Não Informado pela instituição
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Palavras-chave em Português: |
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Palavras-chave em Inglês: |
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Área do conhecimento CNPq: |
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Link de acesso: |
https://ri.ufs.br/handle/riufs/6105
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Resumo: |
The aim of this study was to evaluate the potential of Hancornia speciosa (known as mangaba in Brazil) seeds for the production of bio-oil, in order to minimize the pollution problems caused by the inappropriate disposal of this residue and add value to this material which poses an environmental risk. The study was divided into two parts: the characterization of the biomass (through elemental analysis (CHN), infrared spectroscopy (FTIR-ATR), thermogravimetry (TG), and the moisture, ash, protein, oil, fiber, cellulose, hemicellulose and lignin contents); and the characterization of the bio-oil (thermogravimetry, infrared spectroscopy and gas chromatography/mass spectrometry-CG/MS). The mangaba seeds had a moisture content of 7.78±0.03%, high quantities of carbon (58.07%) and oxygen (27.18%), a calorific value of 23.45 MJ kg-1 and contained ash (1.87±0.06%), oil (27.33±0.37%), protein (12.10±1.60%) fiber (11.98±0.46%), cellulose (17.07%), hemicellulose (22.57%) and lignin (10.16%). The thermogravimetric curve for the sample showed a mass loss of around 90% up to a temperature of 450 °C. In the pyrolysis experiments the variables included temperature (450 and 600 °C), sample mass (5 and 11 g) and prior heating (with or without). The best conditions for the bioproduction of the bio-oil were 600 °C, 11 g of seeds and prior heating of the furnace. The characterization of the samples by FTIR allowed the presence of functional groups such as phenols, alcohols, ketones, acids, alkanes, alkenes, amides, nitriles and esters to be identified. The CG/MS analysis confirmed the results obtained with the infrared spectroscopy, with carboxylic acids and hydrocarbonates (~ 90%) being qualitatively identified as the major components, besides the presence of other compounds such as furanes, phenols, nitriles, aldehydes, ketones, alcohols, esters and amides. |