Excess Molar Volume
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Thermophysical and Transport Properties of the BaCl2-CsCl High Temperature Ionic Liquid Mixtures
High temperature ionic liquids (HTILs) densities and transport properties for mixtures BaCl2 CsCl, x(BaCl2) = 0-1, have been studied as a function of composition and temperature. In terms of Arrhenius theory, the temperature correlation of all measured properties was made and discussed. Thermodynamic properties (isothermal compressibility, molecular volume,
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. DENSITY, REFRACTIVE INDEX, APPARENT VOLUMES AND EXCESS MOLAR VOLUMES OF FOUR PROTIC IONIC LIQUIDS + WATER AT T=298.15 AND 323.15 K
Abstract Densities and refractive index of binay mixtures of water with four protic ionic liquids, based on ammonium and fatty acids, were measured at 298.15 and 323.15 K, under atmospheric pressure. Apparent and excess molar volumes were obtained by experiments and fitting data to the Redlich-Meyer (RM), Redlich-Kister (RK) and Prigogine-Flory-Patterson (PF
Braz. J. Chem. Eng.. Publicado em: 2015-09
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3. Estudo experimental e modelagem do volume em excesso para sistemas do tipo água / alcanodiol / líquido iônico à pressão ambiente e temperatura de 298,15 K / Experimental study and modeling of the excess volume for systems of type water / alcanediol / ionic liquid at ambient pressure and temperature of 298.15 K
Nesta dissertação foi estudado o comportamento do volume em excesso em relação à composição de sistemas contendo água, alcanodióis e um líquido iônico a 298,15 K. Os dados experimentais foram obtidos pelo método indireto utilizando-se a densitometria por oscilação mecânica. Os alcanodióis utilizados nos sistemas estudados foram o 1,2-etanodio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/05/2011
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4. Estudo de Propriedades em Excesso de DeterminaÃÃo do EquilÃbrio LÃquido-LÃquido em Sistemas contendo Biodiesel. / Study of Properties in Excess Determination of Liquid-Liquid Equilibrium in Systems containing biodiesel.
Energias renovÃveis ganharam uma atenÃÃo importante nas Ãltimas dÃcadas devido à diminuiÃÃo das reservas de petrÃleo e o crescimento da conscientizaÃÃo ambiental. Elas podem ser produzidas a partir de uma variedade de gorduras e Ãleos vegetais, inclusive oleaginosas como coco e soja. A produÃÃo de biodiesel a partir de Ãleos vegetais à uma da
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2010
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5. Experimental study and modeling for excess molar enthalpy of liquid solutions containing electrolytes / Estudo experimental e proposta de modelo para a entalpia molar em excesso de soluções aquosas contendo eletrolitos
O presente trabalho consiste na determinação de dados experimentais de entalpia molar em excesso (hE) de soluções líquidas ternárias contendo água + (1,2-propanodiol, 1,3-propanodiol, 1,2-butanodiol, 1,3-butanodiol, 1,4-butanodiol, 2,3-butanodiol) + (brometo de sódio, brometo de amônio, brometo de tetraetilamônio, brometo de 1-n-butil-3- metil-imid
Publicado em: 2009
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6. The influence of ethoxylation degree in the behaviour of secondary alcohol ethoxylates / Influência do grau de etoxilação no comportamento de álcoois secunários etoxilados
The solubilization of non-ionic solutes via partitioning between water and the micellar pseudophase of non-ionic surfactants was evaluated for a series of secondary alcohol ethoxylates with hydrophile length varying from 7 to 40 ethylene oxide units. It was demonstrated that the micellar incorporation constant, Ks, is not dependent on the hydrophile length o
Publicado em: 2009
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7. Estudo experimental do volume molar em excesso de soluções liquidas binarias contendo cloroformio e aminas a diferentes temperaturas e a pressão atmosferica / Experimental study of excess molar volume of binary liquid solutions containing chloroform and amines at different temperatures and at atmospheric pressure
This work consists on a experimental study of excess molar volume Vm of binary liquid solutions of chloroform + n-butylamine, or + s-butylamine, or + diethylamine, or + triethylamine at 288,15, 293,15, 298,15, 303,15 K as a function of composition and at atmospheric pressure, with the objective to study the possibles physical, chemical and structural effects
Publicado em: 2007
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8. Efeito da hidratação hidrofobica e da interação hidrofobica sobre o volume molar em excesso de soluções liquidas binarias de agua-alcool a diferentes temperaturas a pressão atmosferica : estudo experimental e modelagem
Densities of binary liquid mixtures of water + methanol, or + ethanol, or + 1-propanol, or + 2-propanol, or + t-butanol have been determined as a function of composition in the range 288.15 - 318.15 K at atmospheric pressure using a vibrating-tube densimeter. Excess molar volumes (Vm) were calculated. TheVm values were described through a Redlich-Kister type
Publicado em: 2004
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9. 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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10. Estudo experimental e modelagem do volume em excesso para sistemas do tipo agua/acetonitrila/eletrolito a pressão ambiente na faixa 283,15-308,15K
In this work the behavior of the excess volume of systems of the type water-acetonitrile-electrolyte as a function of the composition (fraction molar of the solvent between O and 1, fraction molar of the salt from 0,001 to 0,003) and of the temperature (283,15K - 308,15K) at room pressure, using the a vibrating-tube densimeter was studied. The system water-a
Publicado em: 2001
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11. Estudo fisico-quimico de polietileno glicol com agua e sorventes aromaticos
This work presents results on some physico-chemical properties of low molecular weight polyethylene glycol (PEG) studied by spectophotometric, volumetric and calorimetric methods. These properties can be expressed as function of the number of meros. The dye acridine orange (AO), dissolved in PEG, was used as molecular probe to investigate the hydration proce
Publicado em: 1993
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12. Whey Fermentation by Anaerobiospirillum succiniciproducens for Production of a Succinate-Based Animal Feed Additive
Anaerobic fermentation processes for the production of a succinate-rich animal feed supplement from raw whey were investigated with batch, continuous, and variable-volume fed-batch cultures with Anaerobiospirillum succiniciproducens. The highest succinate yield, 90%, was obtained in a variable-volume fed-batch process in comparison to 80% yield in a batch cu
American Society for Microbiology.