Browsing by Author "Legido, José L."

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    Analysis of thermal properties of peloids used in thalassotherapy centres.
    (2018-10-22) Gómez, Carmen P.; Mato, Marta M.; Casás, Lidia; Andreatta, Alfonsina E.; Legido, José L.; Fernández-Marcos, Dolores
    Peloids are heterogeneous systems and consist of mixtures of a solid substrate with mineral water or seawater used for therapeutic purposes in thermal spas or thalassotherapy centres. Thermotherapy is one of the therapeutic applications of peloids, that is, the use of heat for therapeutic purposes. There are different ways of applying peloids such as plasters, cataplasms or wrapping. These forms of application, named pelotherapy, are integrated in the marine cure made in thalassotherapy centres. Thermotherapy is used in health therapies, either for thermotherapeutic or cosmetic purposes. Analysis of thermal properties of peloids is a useful tool for studying peloids and evaluating their suitability from a thermotherapic point of view. This work focusses on the study of the thermal conductivity, the specific heat, and the thermal diffusivity of different peloids constituted by seawater as the liquid phase of the mixture.
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    Experimental and theorical study of surface tension and density of 1,2-dimethylbenzene with alkanes at 298.15 K.
    (X Iberoamerican Conference on Phase Equilibria and Fluid Properties for Process Design. Alicante (España)., 2015-06-28) Andreatta, Alfonsina E.; Martini, Ricardo E.; Casás, Lidia; Legido, José L.
    Methylbenzenes occur in small quantities in naphtha and higher boiling fractions of petroleum. Those presently of commercial importance are toluene, 1,2-Dimethylbenzene (o-xylene), 1,4-Dimethylbenzene (p-xylene), and to a much lesser extent 1,3-Dimethylbenzene (m-xylene). Particularly, 1,2-Dimethylbenzene is mainly used to produce phthalic anhydride for plasticizers. The primary sources of xylenes are reformates from catalytic reforming units, gasoline from catcraking, and pyrolysis gasoline from steam reforming of naphtha and gas oils. Solvent extraction is used to separate these aromatics from the reformate mixtures[1]. For this reason, physical properties of pure liquids and liquid mixtures containing aromatic and aliphatic compounds and their dependence with composition are very important basic data for petrochemical industry. Due to the lack of experimental information regards 1,2-dimethylbenzene, in this work, experimental data of surface tension and density of this compound with octane, nonane and decane at 298.15K and atmospheric pressure are presented. The surface tension deviation and the excess molar volume have been correlated by Redlich Kister polynomial equation. An theoretycal study has been applied in this mixtures using different models [2-3].
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    Surface tension for the ternary system dimethyl carbonate + p-xylene+ n-octane from 288.15 K – 308.15 K.
    (X Iberoamerican Conference on Phase Equilibria and Fluid Properties for Process Design. Alicante (España)., 2015-06-28) Gayol, A.; Casás, Lidia; Martini, Ricardo E.; Andreatta, Alfonsina E.; Legido, José L.
    Dimethyl carbonates are useful in organic solvents because the chemical used as solvent extraction processes, as well as battery technology [1,2]. Molecules carbonate base, containing an aromatic and aliphatic portions have special industrial interest as gasoline additives and as lubricants in the replacement of chlorofluorocarbons (CFCs) with the new refrigerants HFC (hydrofluorocarbons) [3-6]. These industrial uses are the main reason why there has been a considerable increase in theoretical and experimental investigations of dialkyl carbonates and mixtures there of with other compounds [7-9], so our research group has also focused on the study (measurements and models) of mixtures containing carbonate molecules. The interest in the study of this mixture lies in the fact that dimethyl carbonate [10,11] has been considered as a replacement of traditional oxygenated gasoline additive, because it is a non-toxic and environmentally friendly product capable of reducing pollutant emissions as carbon monoxide. This work presents a study of experimental surface tension for the ternary system dimethyl carbonate + p-xylene +n-octane binary system, in the temperature range from 288.15 K to 308.15 K and at atmospheric pressure. The surface tension values were fitted by a variable degree polynomial [10-12].