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Please use this identifier to cite or link to this item: http://hdl.handle.net/10362/8057

Título: Continuous catalyst free production of biodiesel from agro industrial waste with green solvents
Autor: Montoya, Carmen Alicia Moreno
Orientador: Simões, Pedro
Paiva, Alexandre
Palavras-chave: Biodiesel
Carbon dioxide
Supercritical fluids
Methanol
Food industry waste
Spent coffee grounds
Issue Date: 2012
Editora: Faculdade de Ciências e Tecnologia
Resumo: The aim of this thesis consists in the study of the production of biodiesel via catalyst free direct transesterification of spent coffee ground oil with supercritical methanol in a continuous process. Supercritical methanol is passed through a packed bed reactor with the spent coffee grounds. Inside the reactor supercritical methanol extracts the triacylglycerols, which are immediately transesterified into fatty acid methyl esters. Therefore, the extraction and transesterification processes take in a single step. It was demonstrated that, at the optimal conditions of operation of 533 K, 10 MPa and solvent flow of 1 ml/min, the maximum yield for the total process was 83%. The effect of supercritical CO2 (ScCO2) as co-solvent was also studied. When using carbon dioxide as co-solvent at supercritical conditions, higher yields were obtained at milder temperature conditions. A maximum yield for the total process of 86% was obtained at 314 K for extraction of oil, 473 K for the reaction into FAME, 10MPa, solvent flow of 4.13 ml/min and a volume fraction of ScCO2 in the solvent feed of 27%.
Descrição: Dissertação para obtenção do Grau de Mestre em Engenharia Química e Bioquímica
URI: http://hdl.handle.net/10362/8057
Appears in Collections:FCT: DQ - Dissertações de Mestrado

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