Teses

URI permanente para esta coleçãohttps://rigalileo.itegam.org.br/handle/123456789/175

Teses produzidas oriundas de convênios com universidades

Navegar

Agora exibindo 1 - 2 de 2

ANÁLISE EXPERIMENTAL DO PROCESSO DE EXTRAÇÃO DO ÓLEO ESSENCIAL DE PUXURI [Licaria puchury-major (Mart.) Kosterm., Lauraceae] POR ARRASTE COM VAPOR
(Universidade Federal do Pará, 2014) MAFRA, Eduardo de Souza; FARIA, Lênio José Guerreiro de
This work experimentally analyzes the extraction process of essential oil from seeds and aerial parts of puxuri by steam distillation. Puxuri [Licaria puchury-major (Mart.) Kosterm., Lauraceae] is an Amazonian forest species with great potential for the bioproducts industry (pharmaceuticals, cosmetics, food, and natural pesticides) due to the presence of safrole in its essential oil. An anatomical and physicochemical characterization study was carried out on plant parts used for oil extraction. The drying kinetics of seeds, thin branches, and leaves were studied, and the influence of convective drying on safrole content and final moisture was quantified. Statistically designed experiments identified the optimal levels of process variables to maximize both essential oil yield and safrole content within the adopted experimental domain and 90% confidence. The essential oil was chemically analyzed by GC-MS to identify its major components. Desorption isotherms were obtained for powdered puxuri seeds, well-fitted by the GAB model, with estimated sorption heats and equilibrium moisture contents. The essential oil showed low toxicity, and the solid residue from the extraction process can be used as raw material for the production of cold-process transparent soaps.
ESTUDOS DE PROCESSOS DE EXTRAÇÃO E CARACTERIZAÇÃO DE FIBRAS DO FRUTO DO AÇAÍ (Euterpe oleracea MART.) DA AMAZÔNIA PARA PRODUÇÃO DE ECOPAINEL DE PARTÍCULAS DE MÉDIA DENSIDADE
(Universidade Federal do Pará, 2013) MESQUITA, Antonio de Lima; FARIA, Lênio José Guerreiro de
The fibrous tissue of the açaí fruit (Euterpe oleracea Mart.) is discarded in large quantities in the Metropolitan Region of Belém (PA), Brazil, after juice production. This agro-industrial residue is rarely utilized sustainably. This thesis aimed to study extraction and treatment processes of açaí fruit fibers through biological maceration, both spontaneous and induced, and chemical mercerization with NaOH, with and without autoclave, for the development of new alternative composite materials for the civil construction industry. Anatomical, chemical, physical, and mechanical characterizations of the fibers were performed, followed by the fabrication of homogeneous particle ecopanels bonded with castor oil-based bicomponent polyurethane resin. The physical-mechanical and microstructural characterization of the ecopanels demonstrated significant improvements in treated fiber properties, such as tensile strength, water absorption, and thickness swelling, evidencing the potential use of the residue as raw material for the production of sustainable ecopanels with possible applications in the construction and furniture industries.