Engenharia Química
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/25
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14 resultados
Resultados da Pesquisa
- Experimental study and correlation of the excess molar volume of binary liquid solutions of (amines + water) at different temperatures and atmospheric pressure(2022-03-05) MUNOZ, P. A. R.; OLIVIERI, G. V.; Ronaldo Santos; Ricardo Torres© 2021, Associação Brasileira de Engenharia Química.Experimental data of density have been measured for binary liquid mixtures containing {amines (n-butylamine, or s-butylamine, or t-butylamine, or diethylamine, or propylamine) + water}, over the entire range of composition at temperatures between 283.15 and 303.15 K, and atmospheric pressure. The density values enabled the determination of the thermal expansion coefficients. The excess molar volume, VmE, was calculated using the experimental data, from which a Redlich–Kister type polynomial was fit, enabling the determination of the partial molar volumes, the excess partial molar volumes, the apparent molar volumes and the excess partial molar volumes at infinite dilution. The VmE values were also used to test the applicability of the Extended Real Associated Solution Model (ERAS Model). The results for the studied systems suggest that structural effects and chemical interactions must predominate over other possible effects. The magnitude of VmE for the studies systems led to the following order: n-butylamine > propylamine > s-butylamine > diethylamine > t-butylamine.
- Molecular interactions of (ionic liquid butylammonium methanoate + alcohols) at several temperatures. Part II: sec-Butylammonium methanoate (S4Met)(2023-04-05) HOGA, H. E.; FERNANDES, R. L.; OLIVIERI, G. V.; Ricardo Torres© 2022 Elsevier LtdVolumetric and acoustic properties were obtained by density (ρ) and speed of sound (u) experimental values for the binary liquid systems containing the protic ionic liquid (IL) sec-butylammonium methanoate (S4Met) + alcohols (ethanol, 1-propanol, 1-butanol and 1-pentanol) over the whole composition range at different temperatures (293.15–313.15) K and ambient pressure (p = 92.3 kPa). A neutralization reaction was carried out under controlled temperature to synthesize S4Met, which underwent spectroscopic analyses to guarantee its formation. All the excess properties, namely excess molar volume,VmE, excess partial molar volumes,V¯iE, and deviation in isentropic compressibility,ΔκS, presented negative values. Other volumetric properties such as partial molar volumes,V¯i, apparent molar volumes, Vϕi and infinite dilution volumes,V¯i∞, were determined. In addition to the thermodynamic approach, spectroscopy techniques essentially 1H NMR, 13C NMR, FTIR were useful in order to elucidate intermolecular interactions among the species in solutions. Lastly, the Peng-Robinson-Stryjek-Vera equation of state (PRSV EOS) was used to correlate the excess molar volumes.
- Binary mixtures of {1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][triflate]) + alcohols} at high-pressure: A thermodynamic, spectroscopic and correlation approach(2022-06-05) BENESTANTE HAUK, D.; Ricardo Torres; VICENTE HALLAK DANGELO, J.© 2022 Elsevier LtdThe density of binary mixtures of {1-Ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][triflate]) + alcohols} has been measured at temperatures from (298.15 to 308.15) K and pressures from (0.1 to 40) MPa. The effect of temperature and pressure on density and calculated excess molar volumes, partial molar volumes, apparent molar volumes and partial molar volumes at infinite dilution was analyzed. The experimental density results were correlated by using the Tait-Tammann equation to deduce isothermal compressibility and isobaric expansivity. In addition to the thermodynamic study, some spectroscopic properties (H-NMR, C-NMR and FT-IR) were presented to elucidate some possible molecular interactions between the components under study. Furthermore, the Extended Real Associated Solution Model (ERAS Model) was applied to correlate the values of excess molar volume.
- Volumetric properties of binary mixtures of glycerol + alkanols (C1-C4): Experimental study and application of the Peng–Robinson–Stryjek–Vera equation of state(2022-05-05) VICENTE, V. B.; OLIVIERI, G. V.; Ronaldo Santos; Ricardo TorresVolumetric properties for binary mixtures of (glycerol + methanol, or + ethanol, or + 1-propanol, or + 2-propanol, or + 1-butanol) have been determined as a function of composition using experimental data of density at T = (288.15, 293.15, 298.15, 303.15 and 308.15) K and p = 92.3 kPa. The density measurements have been determined by using a vibrating-tube densimeter. The density values enabled the determination of the thermal expansion coefficient and the excess molar volume. The values of excess molar volume were correlated by a Redlich-Kister polynomial and by the Peng-Robinson-Stryjek-Vera equation of state (PRSV EOS). These values were also used in the estimation of the partial molar volumes, excess partial molar volumes and apparent molar volumes. Three different methods were used to determine the partial molar volumes at infinite dilution. For all studied systems, the values of excess molar volumes were negative over the entire composition range and suggest predominance of chemical and structural effects.
- Thermodynamic and spectroscopic properties of binary {1-Ethyl-3-methylimidazolium thiocyanate ([EMIM][SCN]) + alcohols} mixtures at T = (298.15 to 308.15) K and p = (0.1 to 40) MPa: Experimental study and modelling(2021-09-05) HAUK, D. B.; Ricardo Torres; D'ANGELO, J. V. H.© 2021 Elsevier LtdIn this study, densities for binary mixtures of {1-Ethyl-3-methylimidazolium thiocyanate ([EMIM][SCN]) + alcohols} have been measured at temperatures from T = (298.15 to 308.15) K and pressures from p = (0.1 to 40) MPa. These results have been used to calculate the excess molar volumes, partial molar volumes, apparent molar volumes and partial molar volumes at infinite dilution. The experimental density data were correlated by using the Tait-Tammann equation to obtain isothermal compressibility and isobaric expansion. Moreover, the values of excess molar volume were used to test the applicability of the Extended Real Associated Solution Model (ERAS Model). In order to elucidate possible structural phenomena, spectroscopic properties (H-NMR, C-NMR and FT-IR) were combined with the thermodynamic results trying to understand the molecular interactions among the unlike components present in the studied systems.
- Density and Derived Properties of Binary Mixtures Containing {2-(Dimethylamino)ethyl Methacrylate + Alcohols} at Temperatures from T = (293.15 to 313.15) K and Pressures of up to 35 MPa(2019) Muche D.N.F.; Olivieri G.V.; Torres R.B.© 2019 American Chemical Society. In this study, experimental density data (ρ) for binary liquid mixtures containing {2-(dimethylamino)ethyl methacrylate (DMAEMA) + methanol, or + ethanol, or + 1-propanol, or + 1-butanol, or + 1-pentanol} have been measured over the entire composition range at temperatures from T = (293.15 to 313.15) K and pressures of up to 35 MPa. Density measurements were obtained using an Anton Paar DMA 4500 vibrating-tube densimeter coupled to an external Anton Paar DMA HP high-pressure measuring cell. The experimental results for density have been fit to the Tait-Tammann equation and used to calculate the isothermal compressibility (κ T ), the thermal expansion coefficient (α p ), and the internal pressure (π). The excess molar volume (Vm E ) values have still been calculated and used to test the applicability of the extended real associated solution model (ERAS model) and the Prigogine-Flory-Patterson theory (PFP Theory). The thermodynamic results suggest that structural and chemical effects must outweigh physical effects.
- Thermodynamic properties of binary mixtures of n-butylammonium-based ionic liquids with ethanol at T = (293.15–313.15) K(2019) Bittencourt S.S.; Hoga H.E.; Torres R.B.; d'Angelo J.V.H.© 2018, Akadémiai Kiadó, Budapest, Hungary. In this study, density, speed of sound and viscosity of binary mixtures of ionic liquids + ethanol have been measured as a function of composition at T = (293.15–313.15) K and atmospheric pressure. The ionic liquids studied were: {n-butylammonium acetate (N4Ace), n-butylammonium propanoate (N4Pro), n-butylammonium hexanoate (N4Hex), and n-butylammonium decanoate (N4Dec)}. Excess molar volume, VmE, deviation in isentropic compressibility, Δ κ S , deviation in viscosity, Δ η, and excess Gibbs energy of activation of viscous flow, Δ G ∗ E , were obtained from experimental results and correlated with the Redlich–Kister polynomial equation. Ionic liquids were synthesized and characterized using 1 H-NMR, 13 C-NMR and FTIR spectroscopy techniques. For all systems studied, the values of VmE, Δ κ S and Δ η were negative over the entire composition range, whereas Δ G ∗ E values were positive over the entire composition range. The results obtained were discussed in terms of structural effects and intermolecular interactions between like and unlike molecules.
- Thermodynamics properties of binary mixtures of aqueous solutions of glycols at several temperatures and atmospheric pressure(2018) Hoga H.E.; Torres R.B.; Volpe P.L.O.© 2018 Elsevier LtdDensities (ρ), speeds of sound (u) and viscosities (η) for binary mixtures of {water + ethanol, or + ethylene glycol (EG), or + diethylene glycol (DEG), or + triethylene glycol (TEG), or + polyethylene glycol (PEG) 200, or + polyethylene glycol (PEG) 300, or + polyethylene glycol (PEG) 400, or + polyethylene glycol (PEG) 600, or + glycerol} have been determined as a function of composition at T = (293.15, 298.15, 303.15 and 308.15 K) and atmospheric pressure. From these results, excess molar volume (VmE), deviation in isentropic compressibility (ΔκS), deviation in viscosity (Δη), and excess Gibbs energy of activation for viscous flow (ΔG∗E) were calculated and fitted by the Myers-Scott equation, as a function of mole fraction. Values of VmE and ΔκS were negative over the entire composition range for all mixtures studied. The values of Δη were negative for the systems containing ethylene glycol and glycerol and positive for the systems containing ethanol, PEG 400 and PEG 600. For other systems, the deviation of viscosity presented an S-shape, with negative values at high water concentration. For all mixtures studied, the values of ΔG∗E were positive over the entire composition range. The results obtained were discussed in terms of structural effects and intermolecular interactions between like and unlike molecules.
- Thermodynamic and spectroscopic properties of binary mixtures of n-butylammonium butanoate ionic liquid with alcohols at T = (293.15–313.15) K(2017) Bittencourt S.S.; Hoga H.E.; Torres R.B.; d'Angelo J.V.H.© 2016 Elsevier LtdIn this work, density and speed of sound of binary mixtures of {n-butylammonium butanoate ionic liquid (N4Bu) + alcohols (methanol, ethanol, 1-propanol, 1-butanol and 1-pentanol)} have been measured as a function of composition at T = (293.15–313.15) K and atmospheric pressure. The results were used to calculate the excess molar volume, VmE, and deviation in isentropic compressibility, ΔκS, and correlated to the Redlich-Kister polynomial equation. N4Bu was synthesized by the method of acid-base neutralization reaction using n-butylamine and butanoic acid, and characterized using 1H NMR, 13C NMR and FTIR spectroscopy techniques. For all systems studied, the values of excess molar volumes and deviations in isentropic compressibility were negative over the entire composition range. The results obtained were discussed in terms of structural effects and intermolecular interactions between like and unlike molecules.
- 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.