Engenharia Química
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/25
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8 resultados
Resultados da Pesquisa
- Measurement and correlation of high-pressure volumetric properties of binary mixtures of 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][NTf2]) with alcohols(2023-10-05) HAUK, D. B.; Ricardo Torres; DANGELO, J. V. H.© 2023 Elsevier LtdNew experimental data for density-pressure–temperature measurements of binary mixtures of {1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][NTf2]) + methanol, or + ethanol or + 1-propanol} have been measured using a vibrating tube densimeter at temperatures from T = (298.15 to 308.15) K and pressure range p= (0.1 – 40) MPa. The experimental density results have been correlated by the Tait-Tammann equation with the temperature and composition dependence parameters. The effects of the increase in the alkyl chains of the alcohols, temperature, and pressure on the density and volumetric properties have been analyzed. Moreover, the Extended Real Associated Solution Model (ERAS Model) has been used to correlate the experimental behavior of the excess molar volume of the studied systems.
- 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.
- Molecular interactions of ionic liquid {n-butylammonium methanoate (N4Met) + alcohols} at several temperatures: Thermodynamic and spectroscopic properties(2020-09-05) FERNANDES, R. L.; HOGA, H. E.; Ricardo Torres© 2020New experimental data for density, speed of sound and viscosity for binary mixtures of protic ionic liquid {n-butylammonium methanoate (N4Met) + ethanol, or +1-propanol, or +1-butanol, or +1-pentanol} were measured in the whole concentration range at different temperatures T = (293.15–313.15) K and p = 92.3 kPa. These results were used to obtain derived mixtures and excess properties. Correlation for viscosity proposed by Grünberg-Nissan, Heric-Brewer, Van der Wyk and Katti-Chaudhri have been used to correlate the viscosity values for the binary mixtures. To complement the thermodynamics results, spectroscopic studies (1H NMR, 13C NMR, FTIR) have been performed.
- 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.
- Molecular interactions of ionic liquid {n-butylammonium methanoate (N4Met) + alcohols} at several temperatures: Thermodynamics and spectroscopic properties(2020-09-05) LUNKEZ-FERNANDES, ROBERT; HOGA, HELOISA EMI; TORRES, RICARDO BELCHIORNew experimental data for density, speed of sound and viscosity for binary mixtures of protic ionic liquid {n-butylammonium methanoate (N4Met) + ethanol, or +1-propanol, or +1-butanol, or +1-pentanol} were measured in the whole concentration range at different temperatures T = (293.15–313.15) K and p = 92.3 kPa. These results were used to obtain derived mixtures and excess properties. Correlation for viscosity proposed by Grünberg-Nissan, Heric-Brewer, Van der Wyk and Katti-Chaudhri have been used to correlate the viscosity values for the binary mixtures. To complement the thermodynamics results, spectroscopic studies (1H NMR, 13C NMR, FTIR) have been performed.
- 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.
- Treatment of chromium effluent by adsorption on chitosan activated with ionic liquids(2017) Eliodorio K.P.; Andolfatto V.S.; Martins M.R.G.; de Sa B.P.; Umeki E.R.; de Araujo Morandim-Giannetti A.© 2017, Springer Science+Business Media Dordrecht.This study proposes, verifies, and refines the use of biopolymers treated with two new ionic liquids (ILs) (sec-butylammonium acetate and n-octylammonium acetate), as a platform for chromium adsorption. The ILs were synthesized, characterized, and applied to chitosan treatment. Analyzing the size distribution of microparticles of chitosan and chitosan activated with ILs (sec-butylammonium acetate and n-octylammonium acetate), we observed that a little decrease in the particle size occurred with the activation of chitosan (176 ± 0.02 μm to 167 ± 0.054 and 168.5 ± 0.05 μm, respectively), as well as changes in the X-ray diffraction FTIR_ATR spectra. Further studies were performed using the best adsorbent – chitosan treated with sec-butylammonium acetate. In this case, the chromium VI concentration in the sample was reduced by more than 99% when using chitosan treated with IL sec-butylammonium acetate. The best reaction time was determined as 1 h, which allowed a chromium adsorption of 99.1% and the adsorption kinetic data were best represented by the second-order model (k2 = 11.7258 g mg−1 min−1). The maximum adsorption capacity was obtained using the Langmuir isotherm model (20.833 mg g−1 at pH 4 during 1 h, using 1.0 g of chitosan), and the adsorption efficiency was enhanced at 25 °C by the Freundlich isotherm model, in which the constants KF and n were determined as 0.875 mg L−1 and 1.610, respectively.