Vapor Extraction
Mostrando 25-36 de 37 artigos, teses e dissertações.
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25. Estudos dos processos de destilação molecular para a obtenção de alfa-tocoferol (vitamina E) e de extração supercritica para a obtenção de alfa-tocoferol e beta-carotero (pro-vitamina A)
Brazil has a privileged position due to its potentiality of natural resources and agriculture, mainly, in this moment that the substitution of conventional materials used in the nutritious, pharmaceutical and cosmetic areas by natural products has gained interest and importance. However, technologies to take advantage of such resources are not fully explored
Publicado em: 2004
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26. Caracterização energetica do babaçu e analise do potencial de cogeração
The objective of this work is to estimate the potential of the electric energy surplusproduced by cogeneration in the babassu (Orbignya spp (palmae)) oil extraction sector in Brazil. In order to accomplish this, the biomass availability associated to this palm tree was analyzed for 3 scenarios: 1.168 millions of tons per year of energetic biomass (endocarp a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2003
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27. Larvicidal activity of the essential oil from Lippia sidoides cham. against Aedes aegypti linn
The aim of this work was to study the larvicidal activity of Lippia sidoides essential oil against Aedes aegypti larvae. The essential oil and its hydrolate (saturated solution of essential oil in water) were obtained by vapor extraction and their chemical composition determined by GL-chromatography coupled to mass spectroscopy. Bioassays were run with the e
Memórias do Instituto Oswaldo Cruz. Publicado em: 2003-06
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28. Modelagem e simulação do processo de separação de oleo de soja-hexano por evaporação
Until the two first decades of century XX, the industrial extraction of oleaginosas were carried out exclusively by mechanical process. This process allow to extracted oil of very good quality, but it leads the left residues in the solid material (pie) to be very high, for example 5% for grains as of soy. Such residues besides implying in loss of oil, affect
Publicado em: 2003
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29. Modelagem do equilibrio de fases em misturas de dioxido de carbono supercritico e compostos presentes em produtos naturais / Phase equilibria modeling of mixtures of supercritical carbon dioxide and compounds present in natural products
Modeling and simulation of supercritical extraction processes request a good prediction of conditions of phase equilibrium, conditions that determine the higher concentration of liquid or solid (solute) to be extracted by supercritical fluid (solvent). The main problem in modeling of systems found in supercritica1 extraction processes is the great size diffe
Publicado em: 2002
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30. A study on mass transfer models in the solid-fluid interphase during supercritical extraction processes / Estudo de modelos de transferencia de massa na interface solido-fluido durante processos de extração supercritica
A extração de óleos voláteis com fluido supercrítico é uma tecnologia emergente nas últimas décadas, como alternativa à extração com métodos convencionais, como a destilação por arraste a vapor e a extração com solventes orgânicos. Embora grande parte dos óleos seja obtida por arraste a vapor, este processo apresenta algumas desvantagens, t
Publicado em: 2002
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31. Montagem e avaliação de um equipamento para desodorização de "leite de soja" por arraste de vapor superaquecido
This study used a single variety of soybeans from the same harvest for the production of soymilk. This product is widely used in the Far East, where it is an important nutritional source, but in our culture, it faces considerable resistance amongst consumers, due to the unpleasant flavor of soymilk, which results trom a number of compounds existing in the be
Publicado em: 2002
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32. Equilibrio liquido-liquido em sistemas bifasicos aquosos polimericos contendo eletrolitos
Liquid-liquid extraction by aqueous two-phase systems of the type polymer-salt has been increasing importance in the separation of biomolecules. The thermodynamic behavior of these systems is extremely difficu1t to model, due to the size differences between the smaller molecules and the polymer. In this work, was determined experimental data of the liquid-li
Publicado em: 2001
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33. Equilibrio liquido-vapor dos sistemas n-butanol : dimetilmalonato ou dietilmalonato as pressões de 100 e 200mmHg
Phase equilibrium data are useful in the project and optimization of process that inc1udes phases separation, such as distillation and extraction. Malonates are organic substances that participate as an important intennediate in production reactions, like as ink, pharmaceuticals, pesticides and ftagrances. However their properties are rare in scientific lite
Publicado em: 2000
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34. Modelagem da extração supercritica de oleos essenciais
This work presents complementary and auxiliary methodologies for modeling supercritical extraction of essential oils. The first methodology consists of a mathematical procedure to obtain the fugacity coefficients, from any equation of state. These coefficients are necessary for thermodynamic modeling of the supercritical extraction. This procedure allows to
Publicado em: 1999
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35. Estudo da predição da solubilidade dos oleos essenciais de laranja e limão e aroma de maçã em dioxido de carbono pressurizado
The essential oils of lemon and orange,. are products economic importance to Brazil and obtain these products with high quality, is a technological characteristic of process, highly desirable. Procedures as desterpenation of the oils, increasing its stability, should also be accomplished with the minimum alteration in the characteristics of the products. The
Publicado em: 1999
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36. Remediação de sitios contaminados atraves da extração de vapores do solo
The Soil Vapor Extraction (EVS) is a technique frequently applied in the remediation of contaminated vadose zones by volatile compounds such as gasoline and chlorinated organic solvents, as well as on the gas migration, as methane for example. The procedure consists on creating apressure gradient in the soil, inducing preferencial flow of gases and vapours.
Publicado em: 1991