Chemical And Phase Equilibrium
Mostrando 13-24 de 64 artigos, teses e dissertações.
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13. Aplicação do método da minimização da energia de Gibbs no cálculo de equilíbrio químico e de fases em sistemas eletrolíticos / Application method of the Gibbs energy minimization to calculation of phase and chemical equilibrium in electrolyte systems
In several industrial applications are used mixtures containing different solutes, often these solutes are non-volatile, such as electrolytes. The phase and chemical equilibrium in these processes occur in the various unit operations. The stages of production, as well as the separation and purification steps are critical to product quality. Thus, the calcula
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2011
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14. Condições de equilíbrio termodinâmico: a função disponibilidade
The thermodynamic equilibrium is a state defined by conditions which depend upon some characteristics of the system. It requires thermal, mechanical, chemical and phase equilibrium. Continuum thermodynamics, its radical restriction usually called homogeneous processes thermodynamics, as well as the classical thermodynamic science of reversible processes, eac
Química Nova. Publicado em: 2011
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15. Determinação experimental e modelagem de temperatura de ebulição e pH de sistemas binarios contendo compostos presentes em sucos de frutas / Experimental determination and modeling of boiling pont pH of binary systems containing fruit juice compunds
The vapor-liquid equilibrium of binary aqueous solutions of D-glucose and D-fructose, present in fruit juices, was evaluated by experimental boiling point measurements in a rotary evaporator with total reflux of the vapor phase from 20 kPa to atmospheric pressure (93.6 kPa) and concentration from 10 to 60 % by mass. The experimental data were correlated with
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/04/2010
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16. Modelo de contribuições de grupos aplicado a reações para a formação do biodiesel
The interest in biofuels has increased substantially in recent years due, mainly, to reduced damage to the environment compared to conventional fuels derived from petroleum. Accordingly, biodiesel has been studied by researchers around the world. The main routes of production of biodiesel are the reactions of esterification of fatty acids and transesterifica
Publicado em: 2010
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17. ESTUDO FISICO-QUÍMICO DO COMPLEXO DE INCLUSÃO DO FÁRMACO TRIMETOPRIM COM A β CICLODEXTRINA ALEATORIAMENTE METILADA / STUDY OF PHYSICAL-CHEMICAL INCLUSION COMPLEX DRUG TRIMETHOPRIM WITH RANDOM METHYL Β CYCLODEXTRIN
Cyclodextrins are well-known as good solubilizers for many drug molecules, since they are capable of increasing the solubility of the drugs by the formation of inclusion complexes, which in turn can be used in pharmaceutical formulations. In this work we aimed to prepare and characterize inclusion complexes of the randomly methylated β-cyclodextrin (RAM
Publicado em: 2010
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18. Estudo por espectroscopia micro-Raman dos mecanismos de separação de fase em vidros fosfatos de metais de transição
Glass-ceramics are prepared by controlled separation of crystal phases in glasses, leading to uniform and dense grain structures. On the other hand, chemical leaching of soluble crystal phases yields porous glass-ceramics with important applications. Here, glass/ceramic interfaces of niobo-, vanado- and titano-phosphate glasses were studied by micro-Raman sp
Química Nova. Publicado em: 2009
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19. Simulação numérica da separação de misturas CH4/He e CO2/He em colunas de adsorção em leito fixo
Methane and carbon dioxide gases are part of natural gas composition and methane is in bigger proportion. Both gases are pollutants which methane is the most responsible by the greenhouse effect and carbon dioxide in turn by pipelines oxidation in natural gas transporting. The separation of CO2 from natural gas promotes an increase in calorific power of the
Publicado em: 2009
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20. Evolução quimica e isotopica dos fluidos associados a mineralização de Fe-Cu-Au do deposito Alvo 118, provincia mineral de Carajas - PA / Chemical and isotopic evolution of the fluids from the Alvo 118 Fe-Cu-Au do deposit, Carajas mineral province (PA)
The Alvo 118 iron oxide-copper-gold (IOCG) deposit (170 Mt @ 1,0 wt% Cu, 0,3 g/t Au), together with the world-class Sossego and Cristalino deposits, lie in the southern sector of the Carajas Mineral Province (CMP) along a steeply-dipping, WNW-ESE-striking, 60 km-long shear zone, close to the contact of the Itacaiunas Supergroup metavolcano-sedimentary sequen
Publicado em: 2009
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21. Aplicação de metodos de otimização para o calculo do equilibrio quimico e de fases combinados para processos com gas de sintese / Optimization methods applied of the chemical and phase equilibria for sungas process
This research consists of applying methods of global optimization for chemical equilibrium calculation and combined phases for mixtures with synthesis gas. The synthesis gas has great industrial interest, for the innumerable possibilities of various chemical composite productions. Of this form, is basic to know the thermodynamic conditions which favor the at
Publicado em: 2008
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22. Aplicação de simulated annealing para o calculo de equilibrio de fases de misturas complexas / Simulated annealing applied to the calculation of phase equilibria for a complex misture
In many industrial processes, during the phase of refining and separation, products form very complex mixtures. It is the case, for example, of the vegetal oil and citric acid industries. As these mixtures are formed by many components, determination and calculation of thermodynamic properties and phase equilibrium are very complicated. In this way, the use
Publicado em: 2007
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23. Simulation and optimization of sweetening and dehydration process of natural and refinary gas / Simulação e otimização dos processos de adoçamento e desidratação de gas natural e de refinaria
Two processes are widely used in the gas processing: sweetening and dehydration. Sweetening consists in removing acid gases, H2S and CO2, while dehydration is for water removing. The presence of these components causes several problems with the handling and transport of the gas like toxicity, corrosion and hydrate formation. So, it is clear the importance of
Publicado em: 2007
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24. 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