Engenharia Química
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/25
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12 resultados
Resultados da Pesquisa
- High-pressure densities and derived properties of binary {methyl tert-butyl ether (MTBE) + alcohols} mixtures(2018) Hauk D.B.; Torres R.B.© 2017, Akadémiai Kiadó, Budapest, Hungary.In this study, density of binary liquid mixtures of {methyl tert-butyl ether (MTBE) + ethanol, or + 1-propanol, or + 1-butanol} has been determined as a function of composition at temperature 290 K and pressure up to 35 MPa. Densities data were measured using an Anton Paar DMA 4500 vibrating tube densimeter coupled to an external Anton Paar DMA HP high-pressure cell. A Tait equation was used to correlate experimental densities with pressure. The experimental results have been used to calculate the derived volumetric properties such as excess molar volumes (VmE), apparent molar volumes (Vϕ i), partial molar volume (V¯ i) and isothermal compressibility (κT). The thermodynamic results suggest that the structural effects and intermolecular interactions must outweigh other possible effects present in the mixtures studied.
- 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.
- Physico-chemistry properties of fuel blends composed of diesel and tire pyrolysis oil(2016) Umeki E.R.; de Oliveira C.F.; Torres R.B.; Santos R.G.D.© 2016 Elsevier LtdPyrolysis of scrap tires has been pointed out as an alternative to the incorrect disposal of tire wastes. Pyrolysis processes can produce tire-derived oils that may be used as fuel or added to conventional fuels, producing fuel blends with improved properties and reduced cost. The pyrolysis process can contribute to remove tire residues of inadequate sites and it can be a sustainable process to produce alternative fuels. In this work, the properties of blends between petroleum diesel and pyrolytic oil obtained from the thermal degradation of tire waste were investigated. The liquid obtained from the tire waste pyrolysis was black oil, possessing a distinctive, unpleasant and strong odor. The compositional analysis of pyrolytic oil describes the liquid as a complex mixture, composed mainly of aromatic compounds and olefins. The oil specific gravity was 0.93 g cm−3, while gasoline and diesel showed 0.74 and 0.84 g cm−3, respectively. The Research Octane Number (RON) for the pyrolytic oil was found to be similar to the RON for Premium gasoline (higher than 100). Its Motor Octane Number (MON) was found to be slightly lower than the MON for gasoline and very higher than those to diesel fuel. The pyrolytic oil showed also higher detonation resistance in relation to the conventional fuels investigated. The oil has the High Heat Value (HHV) in-between than that for gasoline and diesel fuel, achieving 42 kJ g−1. The tire pyrolysis oil was miscible with diesel in the entire concentration range. Pyrolysis oil/diesel blends showed properties that make them able to be applied as fuel. However, blend properties highlight the complexity of the chemical interactions between the fuels, which need consideration before their applications.
- Thermodynamic and spectroscopic study of binary mixtures containing {dimethyl carbonate (DMC) + alcohols} at T = (288.15–308.15) K and p = (0.1–40) MPa: Experimental study and modelling(2019) Olivieri G.V.; Torres R.B.© 2019 Elsevier LtdThe current paper presents experimental measurements of density, ρ, for binary liquid mixtures containing {dimethyl carbonate (DMC) + methanol, or + ethanol, or + 1-propanol)} over the whole composition range, over the temperature range from T = (288.15–308.15) K and pressure up to 40 MPa. The results were used to calculate the excess molar volumes (VmE), which were correlated with a Redlich-Kister type polynomial equation. Other derived volumetric properties such as partial molar volumes V¯i and apparent molar volumes (Vϕi), isothermal compressibilities (κ), thermal expansion coefficients (α) and internal pressures (π) were also calculated. The VmE values were used to test the applicability of the Prigogine-Flory-Patterson Theory (PFP Theory) and the Extended Real Associated Solution Model (ERAS Model). In order to complement the thermodynamic study and attempt to elucidate the main structural and interactional phenomena present in the systems studied, spectroscopic properties (FT-IR, 1H NMR and 13C NMR) have been investigated. The results suggest that for the {DMC + methanol} system, structural and chemical effects should be predominant over the physical effects, while physical interactions must prevail in the systems containing ethanol and 1-propanol.
- 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 and viscometric properties of binary mixtures of {methyl tert-butyl ether (MTBE) + alcohol} at several temperatures and p = 0.1 MPa: Experimental results and application of the ERAS model(2011) Hoga H.E.; Torres R.B.Densities and viscosities of binary mixtures of {methyl tert-butyl ether (MTBE) + methanol, or +ethanol, or +1-propanol, or +2-propanol, or +1-butanol, or +1-pentanol, or +1-hexanol} have been determined as a function of composition at several temperatures and atmospheric pressure. The temperatures studied were (293.15, 298.15, 303.15, and 308.15) K. The experimental results have been used to calculate the excess molar volume (VmE) and viscosity deviation (Δη). Both VmE and Δη values were negative over the entire range of mole fraction for all temperatures and systems studied. Moreover, the VmE values have been used to test the applicability of the Extended Real Associated Solution (ERAS) model. © 2011 Elsevier Ltd. All rights reserved.
- Volumetric properties of binary mixtures of (acetonitrile + amines) at several temperatures with application of the ERAS model(2016) Bittencourt S.S.; Torres R.B.© 2015 Elsevier Ltd. All rights reserved.Densities of binary mixtures of {acetonitrile + n-propylamine, or + n-butylamine, or + di-n-propylamine, or + di-n-butylamine, or + t-butylamine, or + triethylamine} at T = (293.15, 298.15, 303.15 and 308.15) K and atmospheric pressure are reported over the whole composition range. A vibrating-tube densimeter was used to determine the densities. The excess molar volume, VmE, was calculated from these results and correlated to the Redlich-Kister equation. The VmE values were negative for all the studied systems, except for the (acetonitrile + di-n-butylamine) binary mixtures which presented sigmoid behavior with positive values at high acetonitrile concentration. The partial molar volumes at infinite dilution of each component have been determined using three different methods. The VmE experimental results were also used to test the applicability of the Extended Real Association Solution model (ERAS model).
- Pretreatment of Guinea grass (Panicum maximum) with the ionic liquid 1-ethyl-3-methyl imidazolium acetate for efficient hydrolysis and bioethanol production(2018) Odorico F.H.; Morandim-Giannetti A.A.; Lucarini A.C.; Torres R.B.© 2018, Springer Science+Business Media B.V., part of Springer Nature.In the present study, we pretreated the plant Guinea grass (Panicum maximum) with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate [EMIM][OAc] to expose its cellulose fibers. For this, we first determined the composition of Guinea grass, with 6.87 ± 1.21% of ash, 14.33 ± 1.18% of lignin, 70.55 ± 1.15% of holocellulose, 29.9 ± 1.20% of cellulose, and 40.65 ± 1.20% of hemicellulose. After characterizing the material, we determined the IL pretreatment conditions that maximized the enzymatic and acid hydrolysis stages [namely: temperature = 157 °C, reaction time = 30 min, and biomass concentration (relative to total mass) = 14%]. Under these conditions, the enzymatic hydrolysis conversions of glucose and total reducing sugars were respectively 69.8 and 54.2%, determined by enzymatic and DNS methods. The acid hydrolysis was also carried out, and conversions of 57.4 and 27.2% were verified by the enzymatic and DNS methods, respectively. Finally, the hydrolysate obtained after the enzymatic hydrolysis was fermented by the yeast Saccharomyces cerevisiae, and the ethanol yield (81.9%) was determined through gas chromatography.