Engenharia Química
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/25
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5 resultados
Resultados da Pesquisa
- Volumetric properties of binary mixtures of ethers and acetonitrile: Experimental results and application of the Prigogine-Flory-Patterson theory(2008) Torres R.B.; Ortolan M.I.; Volpe P.L.O.In this work, densities of binary mixtures of {acetonitrile + di-n-butyl ether (DNBE), or + tetrahydrofuran (THF), or + 1,4-dioxane (DIO), or + di-isopropyl ether (DIPE)}, have been determined under atmospheric pressure as a function of composition and temperature using a vibrating-tube densimeter. The temperatures studied were T = (288.15, 293.15, 298.15, and 303.15) K. The excess molar volumes (VmE), calculated from density data, are negative over the whole mole fraction range for the temperature range studied. The partial molar volumes at infinite dilution of each component (over(V, -)i∞) have been determined using three different methods. The experimental results have been used to test the applicability of the Prigogine-Flory-Patterson (PFP) theory. © 2007 Elsevier Ltd. All rights reserved.
- Volumetric behaviour of binary mixtures of (trichloromethane + amines) at temperatures between T = (288.15 and 303.15) K at p = 0.1 MPa(2008) Magalhaes J.G.; Torres R.B.; Volpe P.L.O.In this work, densities of binary mixtures of {trichloromethane (TCM) + n-butylamine (n-BA), or + s-butylamine (s-BA), or + diethylamine (DEA), or + triethylamine (TEA)} have been determined under atmospheric pressure as a function of composition and temperature using a vibrating-tube densimeter. The temperatures studied were T = (288.15, 293.15, 298.15, and 303.15) K. The excess molar volumes (VmE), calculated from density data are negative for all studied systems and the negative deviations follow the sequence: TEA > DEA > s-BA > n-BA. Negative values of VmE for binary mixtures were attributed to the formation of hydrogen bonding and of a charge transfer complex between TCM and amines and to structural effects. The partial molar volumes at infinite dilution of each component (over(V, -)ioo) have been determined using three different methods. © 2008 Elsevier Ltd. All rights reserved.
- Volumetric properties of binary mixtures of acetonitrile and alcohols at different temperatures and atmospheric pressure(2007) Torres R.B.; Francesconi A.Z.; Volpe P.L.O.In this work, densities and excess molar volume data of binary mixtures of acetonitrile + methanol, or + ethanol, or + 1-propanol, or + 1-butanol as a function of composition, under atmospheric pressure and at 288.15, 293.15, 298.15 and 303.15 K have been used to calculate partial molar volumes (V-i), excess partial molar volumes (V-iE) and apparent molar volumes (Vφ{symbol}i) of each component. The partial molar volumes at infinite dilution (V-i∞) have been determined using three different methods. © 2006 Elsevier B.V. All rights reserved.
- Volumetric properties of binary mixtures of (water + organic solvents) at temperatures between T = 288.15 K and T = 303.15 K at p = 0.1 MPa(2006) Torres R.B.; Marchiore A.C.M.; Volpe P.L.O.In this work, densities of binary mixtures of {water + formamide (FM), or + N,N-dimethylformamide (DMF), or + dimethylsulfoxide (DMSO), or + N,N-dimethylacetamide (DMA), or + 1,4-dioxane}, have been determined under atmospheric pressure as a function of composition and temperature using a vibrating-tube densimeter. The temperatures studied were T = (288.15, 293.15, 298.15, and 303.15) K. The excess molar volumes ( VmE ), calculated from density data, are negative over the whole mole fraction range for the temperature range studied. The VmE values have been fitted to Redlich-Kister polynomial equation and others volumetric properties were calculated. The partial molar volumes at infinite dilution of each component ( over(V, ̄)i∞ ) have been determined using three different methods. © 2005 Elsevier Ltd. All rights reserved.
- Volumetric properties of chloroalkanes + amines mixtures: Theoretical analysis using theERAS-Model(2009) Torres R.B.; Hoga H.E.; Magalhaes J.G.; Volpe P.L.O.In this study, experimental data of excess molar volumes of {dichloromethane (DCM), or trichloromethane (TCM) + n-butylamine (n-BA), or +s-butylamine (s-BA), or +t-butylamine (t-BA), or +diethylamine (DEA), or +triethylamine (TEA)} mixtures as a function of composition have been used to test the applicability of the extended real associated solution model (ERAS-Model). The values of the excess molar volume were negative for (DCM + t-BA, or +DEA, or +TEA and TCM + n-BA, or +s-BA, or +DEA, or +TEA) mixtures and present sigmoid curves for (DCM + n-BA, or +s-BA) mixtures over the complete mole-fraction range. The agreement between theoretical and experimental results is discussed in terms of cross-association between the components present in the mixtures. © 2009 Springer Science+Business Media, LLC.