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Martín Aznar - One of the best experts on this subject based on the ideXlab platform.

  • Vapor–liquid and liquid–liquid Equilibrium for binary systems ester + a new protic ionic liquid
    Ionics, 2013
    Co-Authors: Víctor Hugo Álvarez, Diego Serrão, Júlio Lopes Silva, Mariana Ricken Barbosa, Martín Aznar
    Abstract:

    This study reports the synthesis of a new protic ionic liquid, bis(2-hydroxyethyl)ammonium butyrate (2-HE_2AB), performed by a Brønsted acid–base reaction between butanoic acid and bis(2-hydroxyethyl)ammonia. The new ionic liquid was characterized by 1D hydrogen NMR spectrum. The ionic liquid shows complete solubility in water, methanol, and ethanol, and is partially soluble in methyl acetate, ethyl acetate, and propyl acetate, while it is not soluble in some alkanes. Density, refractive index, and vapor–liquid Equilibrium were measured for the binary system 2-HE_2AB + methyl acetate at atmospheric pressure. Furthermore, density, refractive index, and liquid–liquid Equilibrium were measured for the binary systems 2-HE_2AB + ester (methyl acetate, ethyl acetate, or propyl acetate) at 293.2 K. The Peng-Robinson equation of state, coupled with the Wong-Sandler mixing rule, was used in the thermodynamic modeling of density, vapor–liquid, and liquid–liquid Equilibrium data. The COSMO-SAC activity coefficient model was used to calculate the activity coefficient within the Wong-Sandler mixing rule. The calculations show deviations for density, for the vapor–liquid Equilibrium, and for the non-polar and polar phases of the liquid–liquid Equilibrium within 13.0, 0.1, 132.5, and 23.8 %, respectively.

  • Experimental and calculated liquid–liquid Equilibrium data for water + furfural + solvents
    Fluid Phase Equilibria, 2012
    Co-Authors: Bruno F. De Almeida, Leonardo Hadlich De Oliveira, Thiago M. Waldrigui, Thiago De C. Alves, Martín Aznar
    Abstract:

    Abstract Liquid–liquid Equilibrium data for water + furfural + ethyl or propyl acetate are reported at 288.2, 303.2 and 318.2 and atmospheric pressure (≈95 kPa). The systems present type II phase diagrams, since water is partially miscible with furfural and esters. In order to obtain more general water + furfural interaction parameters, NRTL and UNIQUAC models were utilized to correlate data determined in this work and data for 13 systems previously reported. The models correlate well the obtained tie lines and NRTL presents better performance than UNIQUAC.

  • Liquid—Liquid Equilibrium Data in Ionic Liquid + 4-Methyldibenzothiophene + n-Dodecane Systems
    Industrial & Engineering Chemistry Research, 2010
    Co-Authors: Leonardo Hadlich De Oliveira, Martín Aznar
    Abstract:

    In this work, liquid−liquid Equilibrium data for 1-ethyl-3-methylimidazolium diethylphosphate ([emim][DEtPO4]) or 1-ethyl-3-methylimidazolium ethylsulfate ([emim][EtSO4]) + 4-methyl-dibenzothiophene (4-MDBT) + n-dodecane systems at 25 and 40 °C and atmospheric pressure (≈95 kPa) were determined by refractometry. 4-MDBT is a DBT derivative and it is one of the most difficult diesel sulfur pollutants to remove by the conventional process of hydrodesulfurization. The liquid−liquid Equilibrium data were used to study the 4-MDBT extraction from n-dodecane as model diesel oil. 4-MDBT distribution coefficients, solvent selectivities, and extraction data also indicate that [emim][DEtPO4] is a better solvent for extractive desulfurization of n-dodecane than [emim][EtSO4]. For a solvent/n-dodecane mass ratio of 0.6, the sulfur content in n-dodecane decreases 17−24% and 5−15% for [emim][DEtPO4] and [emim][EtSO4], respectively. The quality of the data was ascertained by the Hand and Othmer−Tobias correlations, which ...

  • Liquid–liquid Equilibrium of ternary systems containing nicotine
    Fluid Phase Equilibria, 2007
    Co-Authors: Raquel Moreira Maduro, Martín Aznar
    Abstract:

    Liquid–liquid Equilibrium data for the ternary systems nicotine + water + cyclohexane and nicotine + water + 1-butanol were measured at 298.15, 303.15 and 313.15 K. The results show that cyclohexane is better than 1-butanol as a solvent for nicotine extraction. The experimental data were correlated through the well-known NRTL and UNIQUAC models for the activity coefficient, with estimation of new interaction energy parameters, using the simplex minimization method and a composition-based objective function. The results, analyzed in terms of root mean square deviations between experimental and calculated compositions, were considered satisfactory, with NRTL yielding a better representation of the Equilibrium data for the studied systems.

  • Salt effect on liquid–liquid Equilibrium of water+1-butanol+acetone system: experimental determination and thermodynamic modeling☆
    Fluid Phase Equilibria, 2001
    Co-Authors: Fânia S Santos, Saul G D’Ávila, Martín Aznar
    Abstract:

    Abstract Liquid–liquid Equilibrium data for the quaternary systems (water+1-butanol+acetone+sodium chloride) and (water+1-butanol+acetone+sodium acetate) were measured at 20 and 40°C. The results were compared with experimental liquid–liquid Equilibrium data for the ternary, salt-free systems, both from literature and determined in this work. In this way, the salt effect could be evaluated. Ternary liquid–liquid Equilibrium data for the salt-free system water+acetone+1-butanol were also determined and found in good agreement with reported data from literature. The experimental data were correlated with the NRTL activity coefficient model. New thermodynamic interaction parameters were estimated with the Simplex method and the Maximum Likelihood principle, using binary water+1-butanol liquid–liquid Equilibrium data from literature, ternary water+acetone+1-butanol, both from literature and determined in this work, and quaternary water+acetone+1-butanol+salt, determined in this work. The results are very satisfactory in accordance with root mean square deviations between experimental and calculated compositions of both Equilibrium phases, that are always below 1.2%.

Atefeh Kashef - One of the best experts on this subject based on the ideXlab platform.

Ana Soto - One of the best experts on this subject based on the ideXlab platform.

Abdeslam-hassen Meniai - One of the best experts on this subject based on the ideXlab platform.

  • Liquid–liquid Equilibrium of (water + 1-propanol + 1-pentanol) system at 298.15 and 323.15 K
    Fluid Phase Equilibria, 2010
    Co-Authors: Souheila Ghizellaoui, Christophe Coquelet, Dominique Richon, Abdeslam-hassen Meniai
    Abstract:

    Liquid–liquid Equilibrium data for the ternary system water + 1-propanol + 1-pentanol have been deter- mined experimentally at 298.15 and 323.15K using “static–analytic” apparatus involving ROLSITM samplers. The experimental data are correlated considering both NRTL and UNIQUAC activity coeffi- cient models. The results obtained show the ability of both models for the determination of liquid–liquid Equilibrium data of the studied system. The reliability of the experimental tie-line data is determined through the Othmer–Tobias and Bachman equations.

  • Liquid-Liquid Equilibrium of (water+ 1-propanol + 1-pentanol) system at 298.15 and 323.15 K
    Fluid Phase Equilibria, 2010
    Co-Authors: Souheila Ghizellaoui, Christophe Coquelet, Dominique Richon, Abdeslam-hassen Meniai
    Abstract:

    Liquid–liquid Equilibrium data for the ternary system water + 1-propanol + 1-pentanol have been deter- mined experimentally at 298.15 and 323.15K using “static–analytic” apparatus involving ROLSITM samplers. The experimental data are correlated considering both NRTL and UNIQUAC activity coeffi- cient models. The results obtained show the ability of both models for the determination of liquid–liquid Equilibrium data of the studied system. The reliability of the experimental tie-line data is determined through the Othmer–Tobias and Bachman equations.

Peter Englezos - One of the best experts on this subject based on the ideXlab platform.