Hydrocarbons Mixtures
Mostrando 13-24 de 42 artigos, teses e dissertações.
-
13. Obtenção de Propriedades Físico-Químicas de Misturas de Hidrocarbonetos em Baixa e Alta Pressão Visando a Caracterização e a Modelagem
The composition of petroleum may change from well to well and its resulting characteristics influence significantly the refine products. Therefore, it is important to characterize the oil in order to know its properties and send it adequately for processing. Since petroleum is a multicomponent mixture, the use of synthetic mixtures that are representative of
Publicado em: 2007
-
14. Estudo químico e avaliação do potencial farmacológico e herbicida de Maytenus imbricata Mart. ex. Reissek
In this work, it was studied leaves, branches and seeds of Maytenus imbricata, whose chemical constitution and activities pharmacological until this moment had not been reported in literature. From Maytenus imbricata leaves and branches hexane extracts were isolated and identified 3-oxo-lup-20(29)-en-30-al, 30-hydroxy-lup-20(29)-en-3-one, 11 -hydroxy-lup-20(
Publicado em: 2007
-
15. Contribuição ao estudo químico e biológico de Pouteria gardnerii (Mart. &Miq.) Baehni (Sapotaceae)
The present dissertation describes the chemical study and the biological activities of leaves of Pouteria gardnerii (Mart. &Miq.) Baehni, Sapotaceae, usually found at biome Cerrado around Distrito Federal and popularly called frutinha-de-veado, cabritão, sapotinha, leiteiro-da-folha-miúda, aguai-guacú or marmelinho. From the hexane crude extract were isol
Publicado em: 2007
-
16. Aspectos numéricos do problema de cálculo de fenômenos de vaporização retrógrada dupla / Numerical aspects of the problem of calculation of phenomenon of double retrograde vaporization
A vaporização retrógrada dupla é um fenômeno termodinâmico onde, ao invés de uma usual curva de ponto de orvalho, o lugar geométrico dos pontos de orvalho apresenta duas abóbadas (ou domos), em temperaturas ligeiramente acima da temperatura crítica do componente mais volátil, e tem uma forma em S, em temperaturas ligeiramente abaixo da referida te
Publicado em: 2007
-
17. Determinação de fontes de hidrocarbonetos policíclicos aromáticos e alifáticos em sedimentos de ambientes aquáticos
Numerical values of polycyclic aromatic hydrocabons and n-alkanes distribution indexes of sediments are important tools to elucidate the origins of hydrocarbons mixtures. Polycyclic aromatic ratios are sensitive indicators of petrogenic and pyrogenic inputs, while n-alkanes distribution usualy discriminates biogenic from petrogenic sources. The study area of
Publicado em: 2006
-
18. CARACTEREZITION OF GASOLINES BY FT-RAMAN SPECTROSCOPY / CARACTERIZAÇÃO DE GASOLINAS POR ESPECTROSCOPIA FT- RAMAN
The aim of this work was to determine the contents of the more important components and physical properties of commercial gasolines and synthetic mixtures with known composition, prepared in the laboratory. The Raman spectra of 60 gasolines and 52 mixtures were acquired with a Nicolet 950 Fourier Transform Raman (FT-Raman) spectrometer. The raw spectra were
Publicado em: 2003
-
19. HPA adsorvido e morfologia de materiais particulados resultantes de processos de cobustão : queima de oleos combustiveis com elevada razão C/H e de GLP
This work reports the studies performed with two kinds of particulated materiais generated from combustion: cenospheres, in the case of the combustion of oils with high C/H ratio, and soot, in the case of LPG and mixtures of LPG/1butanol and LPG/Methanol combustion. The morphologies of these particulated materiais and the formation of PAH (polycyclic aromati
Publicado em: 2003
-
20. Cuticular hydrocarbons of Chagas disease vectors in Mexico
Capillary gas-liquid chromatography was used to analyse the cuticular hydrocarbons of three triatomine species, Triatoma dimidiata, T. barberi and Dipetalogaster maxima, domestic vectors of Chagas disease in Mexico. Mixtures of saturated hydrocarbons of straight and methyl-branched chains were characteristic of the three species, but quantitatively different
Memórias do Instituto Oswaldo Cruz. Publicado em: 2002-09
-
21. Determinação de dados de equilíbrio de fases para sistemas aquosos com eletrólitos
In the present work are established initially the fundamental relationships of thermodynamics that govern the equilibrium between phases, the models used for the description of the behavior non ideal of the liquid and vapor phases in conditions of low pressures. This work seeks the determination of vapor-liquid equilibrium (VLE) data for a series of multicom
Publicado em: 1999
-
22. Detalhes da historia geologica de Campo de Albacora - Bacia de Campos a partir de biomarcadores acidos
The GC/MS biomarker analyses of eight oils from Albacora Field - Campos Basin(RJ), revealed that the acidic fossil molecules are sensitive to geological phenomena connected with the formations of the reservoirs. It was sugggested some years ago that the reservoirs in Albacora Field were mixtures of two oil pulses of different thermal evolution. This hypothes
Publicado em: 1996
-
23. Liquefação direta do bagaço de cana com formiato de sodio em meio aquoso
The direct liquefaction of sugar cane bagasse was studied in water with formate/argon(A) and, for comparative purposes, with Ca(OH)2/CO(B) and Ca(OH)2/argon(C). Conversion of sugar cane bagasse and yield for extracted oil in the three systems increase with temperature and are higher with reaction systems A and B. The experiments show that the direct applicat
Publicado em: 1984
-
24. Emulsifier of Arthrobacter RAG-1: specificity of hydrocarbon substrate.
The purified extracellular emulsifying factor produced by Arthrobacter RAG-1 (EF-RAG) emulsified light petroleum oil, diesel oil, and a variety of crude oils and gas oils. Although kerosine and gasoline were emulsified poorly by EF-RAG, they were converted into good substrates for emulsification by addition of aromatic compounds, such as 2-methylnaphthalene.