Thermodynamic Consistency
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. MEASUREMENTS AND THERMODYNAMIC MODELING OF VAPOR-LIQUID EQUILIBRIA FOR BINARY SYSTEMS OF ISOPROPYL CHLOROACETATE WITH CYCLOHEXANE, ISOPROPANOL AND BENZENE AT 101.3 kPa
Abstract In this work, the vapor-liquid equilibrium experimental data for the systems of isopropyl chloroacetate + isopropanol, isopropyl chloroacetate + cyclohexane and isopropyl chloroacetate + benzene were measured by a modified Rose-type recirculating still under the pressure of 101.3 kPa. The thermodynamic consistency of the measured data was verified
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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2. PRECIPITATION REACTION OF CLAVULANIC ACID: THERMODYNAMIC AND ELECTRONIC STUDY
In the present article the theoretical calculation of thermodynamic parameters for the two main precipitation agents, potassium 2-ethylhexanoate and t-octylamine, employed by the pharmaceutical industry to obtain potassium clavulanate for clinical use, is described. The results obtained using the standard thermochemistry calculation in the Gaussian package a
Quím. Nova. Publicado em: 2016-09
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3. Measurement and correlation of isobaric vapor-liquid equilibrium for the binary system of cyclopentane and tetrahydrofuran
Isobaric vapor-liquid equilibrium (VLE) data for the cyclopentane and tetrahydrofuran (THF) system were measured at 101.3 kPa by using an equilibrium still. Thermodynamic consistency of the experimental data was confirmed by means of the Herington method. The experimental data were correlated and calculated by the Margules, Van Laar and Wilson activity-coeff
Braz. J. Chem. Eng.. Publicado em: 2014-09
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4. Vapor-liquid equilibrium measurements for the binary system methyl acetate+ethanol at 0.3 and 0.7 MPa
This paper reports experimental data of the isobaric vapor-liquid equilibria (VLE) for the mixture methyl acetate + ethanol at 0.3 and 0.7 MPa, determined using a copper still ebulliometer. The activity coefficients obtained from the experimental data were correlated by using different thermodynamic mathematical models. All the binary systems show a positive
Brazilian Journal of Chemical Engineering. Publicado em: 2011-06
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5. Dynamic optimization of the benzene extractive distillation unit
A mathematical model has been developed for describing the dynamic operation of the N-formylmorpholine extractive distillation column and the corresponding solvent recovery column in the benzene extraction plant. The NRTL equation was used to calculate the equilibrium and thermodynamic properties of the mixtures. The validity of the model in terms of tempera
Brazilian Journal of Chemical Engineering. Publicado em: 2008-12
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6. Modeling of the liquid-vapor equilibrium in mixtures contend ionic liquids / Modelagem do equilíbrio liquido-vapor em misturas contendo liquidos ionicos
Os líquidos iônicos têm recebido considerável interesse devido a seu potencial como solventes projetados, que podem ser adaptados a vários tipos de processos industriais. A razão principal do interesse nos líquidos iônicos como solventes é sua baixa pressão de vapor, a qual minimiza os riscos de exposição e contaminação ambiental. Esta pesquisa
Publicado em: 2007
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7. Determinação experimental de dados de equilibrio liquido-vapor de misturas de solventes e compostos organo-clorados
This work is a contribution to the study of vapor-liquid equilibrium of pollutant substances, mainly solvents and pesticides. It was studied the vapor-liquid equilibrium of isobaric systems at the pressures of 250 and 650mmHg. The systems were formed by the combination of the binary mixtures of 1,2-Dichloroethane, Trichloroethylene and l-Butanol. The data we
Publicado em: 2001
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8. 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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9. 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
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10. Estudo experimental do excesso da energia livre de Gibbs dos sistemas ciclohexano e N-hexano/2-butanol entre 323,15 e 348,15 K
The main propose or this work was the experimental determination or the excess Gibbs free energy or binary systems of the hydrocarbon/alcohol type. The criteria used for selection of the systems included the expansion or experimental information about, the excess Gibbs free energy and a systematic study of its behaviour with regard to temperature variation a
Publicado em: 1990
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11. Termodinamica do equilibrio aplicada a destilação etanol-agua
A method for testing the thermodynamic consistency of experimental liquid-vapor equilibrium data for binary systems through the integration of the coexistence equation is proposed. This method exempts from the use of correlations for both the activity coefficient and saturation pressures and shows a good sensibility. The coexistence equation method is then u
Publicado em: 1985
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12. Thermodynamics and dynamics of phosphatidylcholine-cholesterol mixed model membranes in the liquid crystalline state: effects of water.
A method for obtaining the thermodynamic activity of each membrane component in phosphatidylcholine (PC)/cholesterol mixtures, that is based upon ESR spin labeling is examined. The thermodynamic activity coefficients, gamma PC and gamma chol, for the PC and cholesterol, respectively, are obtained from the measured orientational order parameters, SPC and S(ch