Flow With Chemical Reactions
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Estudo de reatores eletroquímicos para remoção de Cu2+ , Zn2+, Fenol e BTEX em água produzida
The production of water has become one of the most important wastes in the petroleum industry, specifically in the up stream segment. The treatment of this kind of effluents is complex and normally requires high costs. In this context, the electrochemical treatment emerges as an alternative methodology for treating the wastewaters. It employs electrochemical
Publicado em: 2008
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14. Electrochemical degradation of the sodium diclofenac / Estudo da degradação eletroquimica do diclofenaco sodico
This work proposes the development and the optimization of the electrochemical treatment of a synthetic effluent with sodium diclofenac. In this work two stages were executed the study of the redox reactions of the sodium diclofenac and, the process of this organic compound. Hydrodynamic voltammetry experiments were recorded to identity sodium diclofenaco re
Publicado em: 2007
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15. Estudo da degradação de ranitidina via H IND. 2 O IND. 2 eletrogerado/fenton em um reator eletroquimico com eletrodos de difusão / Studyof the degradation eletrochemical of ranitidine it saw H IND. 2 O IND. 2 eletrogerado/fenton in an eletrochemical reactor with electrodes of gaseous diffusion
The study of the electrochemical degradation of the ranitidine, a drug used in the therapy of gastric ulcers was development in two steps. In the first step was studied the electrochemical behavior of the ranitidine on platinum (Pt) and glassy carbon (CV) electrodes, using cyclic voltammetry in aqueous (K2SO4 0.1 M) and non-aqueous (NaClO4 0.1 M in DMF) elec
Publicado em: 2007
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16. Numerical prediction of nonequilibrium hypersonic flow around Brazilian satellite SARA
Hypersonic flows past Brazilian satellite SARA at zero angle of attack in chemical and thermal nonequilibrium are investigated using an axisymmetric Navier-Stokes solver. The numerical solutions were carried out for freestream conditions equivalent to a typically re-entry trajectory with a range of Mach numbers from 10 to 25. The gas was chemically composed
Brazilian Journal of Physics. Publicado em: 2005-03
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17. Three-dimensional simulation of gas-liquid in bubble columns / Simulação tridimensional com sistema gas-liquido em colunas de bolhas
Bubble columns are equipments of simple operation, but presents a complex fluidodynamic. Its basic operation consists of the injection of a gas (disperses phase) in the bottom of the column in a liquid medium (continuous phase). As reactors, they are used in a variety of chemical processes, such as Fischer-Tropsch synthesis, oxidation reactions, alkylation r
Publicado em: 2005
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18. Estudo e projeto de reatores fotoquimicos para tratamento de efluentes liquidos / Study and design of photochemical reactors to treat liquid effluents
Wasterwater treatment has become a fundamental stage of industrial processes. Most wastewater treatment are currently based on biological processes. However, some types of wastewater cannot be treated by such processes due to the fact of possessing toxic. Therefore, the Advanced Oxidation Process (AOP) can be used with success in such wastewater remediation.
Publicado em: 2005
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19. Simulação, modelagem e analise de reator de polimerização de eteno em solução usando catalisador Ziegler-Natta / Simulation, modeling and analysis of ethylene polymerization reactor in solution using Ziegler-Natta catalyst
Polymerization processes are, generally, very complexes due to the high number of parallel reactions and chemical species in reactional medium. Besides, the polymerization reaction engineering may not only attain yield and purity specifications, but also obtain products with certain processability characteristic and final properties that are, in practice, th
Publicado em: 2005
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20. Detecção piezelétrica não-gravimétrica de boro empregando cristal de quartzo com eletrodo separado e superfície quimicamente modificada / Non-gravimetric piezoelectric detection of boron by using quartz crystal with electrode separated and chemically modified surface
Piezoelectric quartz crystals (PQCs) with electrode-separated configuration and chemically modified surface were used to develop a boron sensor. A detection cell was built in such a way that a stainless-steel electrode was held at a short distance (0.3 mm) from the PQC surface, whose original gold electrode was removed. By using impedance spectroscopy, oscil
Publicado em: 2003
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21. Estudo do processo de deposição e propriedades de filmes de oxido de tungstenio obtidos por uma nova tecnicas de deposição / Study of the deposition process of tungsten oxide films obtained by a new deposition technique
This work describes a novel technique for the deposition of tungsten oxide thin films and reports an investigation on their deposition process and properties. The films were obtained in a vacuum deposition chamber fitted with a tungsten filament heated by an ac power supply. Oxygen was admitted into the chamber using mass flow meters. The films were formed o
Publicado em: 2003
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22. Development and characterization of microfiltration hollow-fiber modules for sterilization of fermentation media
Sterilization of fermentation medium involving heat may result in undesirable chemical reactions that alter nutrient concentration and yield products, which interfere in the fermentation performance. Sterilization of heat-sensitive compounds usually involves separate sterilizations of carbon source and nutrient solution. Membrane separation processes are an
Brazilian Journal of Chemical Engineering. Publicado em: 2002-04
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23. Estudo do fluxo gerado por agitadores tipo ancora
Stirred vessels and mixing systems are the core of the chemical industries, and probably they are the oldest equipment in chemical processing for desired products. Due its great importance to the industry, these processes have been developed through the time, and in the last decades, computational techniques have been used in the project and optimization of
Publicado em: 2002
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24. ESTUDO DA ELETRO-OSMOSE EM SOLOS RESIDUAIS DESENVOLVIMENTO DE EQUIPAMENTO E METODOLOGIA DE ENSAIO / THE STUDY OF ELECTRO-OSMOSIS IN RESIDUAL SOILS: DEVELOPMENT OF TEST EQUIPMENT AND METHODOLOGY
The present dissertation presents a laboratory study of electro-osmosis in a residual soil from gneiss. The objective of this study was to develop test equipment and methodology. Two different cells were constructed,one for natural and the other for reconstituted material. The experimental results are consistent with technical literature values. It was obser
Publicado em: 2002