Navegando por Autor "Beltinga, Patrícia Castro"
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Artigo Excess enthalpies for pseudobinary mixtures containing vegetable oils at the temperatures 298.15K, 353.15K and 383.15K(Elsevier, 2014-08-15) Chiavone Filho, Osvaldo; Beltinga, Patrícia Castro; Gmehlinga, Jürgen; Bölts, Rainer; Rareya, Jürgen; Ceriani, Roberta; Meirelles, Antonio José de AlmeidaThis paper presents excess enthalpies for the following systems containing refined vegetable oils: soybean oil + methanol (at 353.15K/722 kPa), soybean oil + ethanol (at 353.15K/687 kPa and 383.15K/653 kPa), soybean oil + n-hexane (at 353.15K/722 kPa and 383.15K/756 kPa), soybean oil + propan-2-ol (at 298.15K/998 kPa), sunflower oil + methanol (at 353.15K/791 kPa), sunflower oil + ethanol (at 353.15K/894 kPa and 383.15K/860 kPa), sunflower oil + n-hexane (at 353.15K/756 kPa and 383.15K/894 kPa), sunflower oil + propan-2-ol (at 298.15K/929 kPa), rapeseed oil + methanol (at 353.15K/963 kPa), rapeseed oil + ethanol (at 353.15K/998 kPa and 383.15K/1136 kPa), and rapeseed oil + n-hexane (at 353.15K/894 kPa and 383.15K/1136 kPa). The measurements were carried out with a commercially available isothermal flow calorimeter. The experimental HE values have been correlated using the Redlich-Kister polynomial equation. The results for systems with propan-2-ol and some values of partial molar excess enthalpies at infinite dilution, HE,∞ i , obtained in this study have been compared to those available in the literature. The results were also discussed in terms of molecular interactionsArtigo Measurements of activity coefficients at infinite dilution in vegetableoils and capric acid using the dilutor technique(Elsevier, 2014-01-15) Chiavone Filho, Osvaldo; Beltinga, Patrícia Castro; Rarey, Jürgen; Gmehling, Jürgen; Ceriani, Roberta; Meirelles, Antonio José de AlmeidaThis paper reports experimental activity coefficients at infinite dilution, , for methanol, ethanol and n-hexane in three refined vegetable oils (soybean, sunflower, and rapeseed oils) measured using the dilutor technique (inert gas stripping method). The measurements were carried out in the temperature range between 313.15 and 353.15 K. Furthermore, activity coefficients at infinite dilution for various solutes (acetone, methanol, ethanol, n-hexane, cyclohexane and toluene) were measured in capric (decanoic) acid using the same technique in the temperature range from 313.13 to 353.30 K. The new data obtained for capric acid and soybean oil were compared with already published experimental data. Additionally, densities of the investigated vegetable oils were measured in the temperature range from 293.15 to 353.15 K. Using the experimental values obtained over the temperature range, the partial molar excess Gibbs energy , enthalpy and entropy at infinite dilution were determined. The relative error for the measurements carried out using the dilutor technique is approximately ±2.5%. The measured data in the investigated refined vegetable oils were also compared with the results of the group contribution methods original UNIFAC and modified UNIFAC (Dortmund) and an extension of the latter method to triacylglycerols was proposed