Documents disponibles écrits par cet auteur

Approximate calculation of distillation boundaries for ternary azeotropic systems / Juan A. Reyes-Labarta in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7462-7466 Titre : Approximate calculation of distillation boundaries for ternary azeotropic systems Type de document : texte imprimé Auteurs : Juan A. Reyes-Labarta, Auteur ; M. D. Serrano, Auteur ; R. Velasco, Auteur Année de publication : 2011 Article en page(s) : pp. 7462-7466 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Azeotropic  mixture  Distillation Résumé : As it is very well known, especially when dealing with the simulation and design of distillation processes and columns, it is essential to know the limitations defined by the vapor-liquid equilibrium (VLE) of the system under consideration. This paper uses a new straightforward algorithm to calculate and completely define the distillation boundaries in different ternary azeotropic systems. The method allows, using cubic splines, the calculation of different distillation trajectories and the selection of those corresponding to the searched distillation boundaries. The algorithm has been applied to eight ternary liquid―vapor systems to test its validity. To simplify the optimization process, an empirical but very accurate equation has been used to calculate the VLE. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239062 [article] Approximate calculation of distillation boundaries for ternary azeotropic systems [texte imprimé] / Juan A. Reyes-Labarta, Auteur ; M. D. Serrano, Auteur ; R. Velasco, Auteur . - 2011 . - pp. 7462-7466. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp. 7462-7466 Mots-clés : Azeotropic  mixture  Distillation Résumé : As it is very well known, especially when dealing with the simulation and design of distillation processes and columns, it is essential to know the limitations defined by the vapor-liquid equilibrium (VLE) of the system under consideration. This paper uses a new straightforward algorithm to calculate and completely define the distillation boundaries in different ternary azeotropic systems. The method allows, using cubic splines, the calculation of different distillation trajectories and the selection of those corresponding to the searched distillation boundaries. The algorithm has been applied to eight ternary liquid―vapor systems to test its validity. To simplify the optimization process, an empirical but very accurate equation has been used to calculate the VLE. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24239062

Checking liquid - liquid plait point conditions and their application in ternary systems / A. Marcilla in Industrial & engineering chemistry research, Vol. 51 N° 13 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5098-5102 Titre : Checking liquid - liquid plait point conditions and their application in ternary systems Type de document : texte imprimé Auteurs : A. Marcilla, Auteur ; M.D. Serrano, Auteur ; Juan A. Reyes-Labarta, Auteur Année de publication : 2012 Article en page(s) : pp. 5098-5102 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ternary  system  Surveillance Résumé : This work reviews the thermodynamic criteria for incipient immiscibility at the plait point in ternary systems, and also shows its application to singular LL equilibria, such as different type 3 ternary systems (Treybal classification), where an inadequate use of the criteria could yield to ambiguities. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25777950 [article] Checking liquid - liquid plait point conditions and their application in ternary systems [texte imprimé] / A. Marcilla, Auteur ; M.D. Serrano, Auteur ; Juan A. Reyes-Labarta, Auteur . - 2012 . - pp. 5098-5102. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 13 (Avril 2012) . - pp. 5098-5102 Mots-clés : Ternary  system  Surveillance Résumé : This work reviews the thermodynamic criteria for incipient immiscibility at the plait point in ternary systems, and also shows its application to singular LL equilibria, such as different type 3 ternary systems (Treybal classification), where an inadequate use of the criteria could yield to ambiguities. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25777950

Kinetic study of the thermal processing and pyrolysis of crosslinked ethylene vinyl acetate—polyethylene mixtures / Juan A. Reyes-Labarta in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7964-7976 Titre : Kinetic study of the thermal processing and pyrolysis of crosslinked ethylene vinyl acetate—polyethylene mixtures Type de document : texte imprimé Auteurs : Juan A. Reyes-Labarta, Auteur ; J. Sempere, Auteur ; A. Marcilla, Auteur Année de publication : 2011 Article en page(s) : pp. 7964-7976 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Pyrolysis  Kinetics Résumé : The different transitions involved in the thermal processing and decomposition of cross-linked ethylene vinyl acetate-polyethylene (EVA-PE) mixtures, with different concentrations of PE and peroximon (cross-linking agent), have been analyzed and simultaneously modeled by the application of a mechanistic pseudokinetic model. The model suggested involves all of the fractions susceptible of undergoing transitions or reactions studied by differential scanning calorimetry and thermogravimetric analysis, including complex and overlapped peaks. The model applied is capable of accurately representing the different processes involved and can be of great interest in the understanding and quantification of such phenomena, including the modeling of heat effects involved in the whole processing or pyrolysis of this type of product. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332120 [article] Kinetic study of the thermal processing and pyrolysis of crosslinked ethylene vinyl acetate—polyethylene mixtures [texte imprimé] / Juan A. Reyes-Labarta, Auteur ; J. Sempere, Auteur ; A. Marcilla, Auteur . - 2011 . - pp. 7964-7976. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7964-7976 Mots-clés : Pyrolysis  Kinetics Résumé : The different transitions involved in the thermal processing and decomposition of cross-linked ethylene vinyl acetate-polyethylene (EVA-PE) mixtures, with different concentrations of PE and peroximon (cross-linking agent), have been analyzed and simultaneously modeled by the application of a mechanistic pseudokinetic model. The model suggested involves all of the fractions susceptible of undergoing transitions or reactions studied by differential scanning calorimetry and thermogravimetric analysis, including complex and overlapped peaks. The model applied is capable of accurately representing the different processes involved and can be of great interest in the understanding and quantification of such phenomena, including the modeling of heat effects involved in the whole processing or pyrolysis of this type of product. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332120

New heterogeneous catalytic transesterification of vegetable and used frying oil / Maria del Remedio Hernandez in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9068-9076 Titre : New heterogeneous catalytic transesterification of vegetable and used frying oil Type de document : texte imprimé Auteurs : Maria del Remedio Hernandez, Auteur ; Juan A. Reyes-Labarta, Auteur ; Francisco J. Valdés, Auteur Année de publication : 2010 Article en page(s) : pp. 9068-9076 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Edible  species  Transesterification  Catalytic  reaction Résumé : In the present work, a new heterogeneous catalyst for oil transesterification with methanol has been developed. The catalyst is based on the introduction of sodium in calcined hydrotalcite. Two different raw materials have been used to determine the usefulness of this new catalyst: sunflower oil and used frying oil from a university restaurant. In this way, the efficiency of the new heterogeneous catalyst by using an urban residue was tested. Different parameters that can modify the extension of the transesterification reaction have been evaluated. Results obtained at 60 °C show that hydrotalcite modified with sodium presents adequate characteristics for this kind of reactions with both raw materials evaluated. An important factor observed in the present study is that no soap was formed in any of the reactions carried out, even in the case of used oil with high acid index. The iodine index of biodiesel generated with waste cooking oil presents values within the limits established by general biodiesel specifications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23289638 [article] New heterogeneous catalytic transesterification of vegetable and used frying oil [texte imprimé] / Maria del Remedio Hernandez, Auteur ; Juan A. Reyes-Labarta, Auteur ; Francisco J. Valdés, Auteur . - 2010 . - pp. 9068-9076. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9068-9076 Mots-clés : Edible  species  Transesterification  Catalytic  reaction Résumé : In the present work, a new heterogeneous catalyst for oil transesterification with methanol has been developed. The catalyst is based on the introduction of sodium in calcined hydrotalcite. Two different raw materials have been used to determine the usefulness of this new catalyst: sunflower oil and used frying oil from a university restaurant. In this way, the efficiency of the new heterogeneous catalyst by using an urban residue was tested. Different parameters that can modify the extension of the transesterification reaction have been evaluated. Results obtained at 60 °C show that hydrotalcite modified with sodium presents adequate characteristics for this kind of reactions with both raw materials evaluated. An important factor observed in the present study is that no soap was formed in any of the reactions carried out, even in the case of used oil with high acid index. The iodine index of biodiesel generated with waste cooking oil presents values within the limits established by general biodiesel specifications. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23289638

Thermal treatment and degradation of cross - linked ethylene vinyl acetate – polyethylene – azodicarbonamide – ZnO foams. complete kinetic modeling and analysis / Juan A. Reyes-Labarta in Industrial & engineering chemistry research, Vol. 51 N° 28 (Juillet 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9515-9530 Titre : Thermal treatment and degradation of cross - linked ethylene vinyl acetate – polyethylene – azodicarbonamide – ZnO foams. complete kinetic modeling and analysis Type de document : texte imprimé Auteurs : Juan A. Reyes-Labarta, Auteur ; A. Marcilla, Auteur Année de publication : 2012 Article en page(s) : pp. 9515-9530 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Modeling  Kinetic  model  Foam  Heat  treatment Résumé : The cross-linking and foaming processes of ethylene vinyl acetate (EVA) copolymer with different concentrations of polyethylene (PE), cross-linking agent (α-α'-bis(tert-butylperoxy)-m/p-diisopropylbenzene), and azodicarbonamide (as foaming agent and using additionally ZnO as accelerating agent) have been studied. The extent of the reactions has been evaluated by gel fraction and density measurements. The different transitions involved in the thermal processing and decomposition have been studied by DSC and TGA and compared for all the mixtures prepared. Mechanistic pseudokinetic models have been suggested and applied involving all the fractions susceptible of undergoing transitions or reactions, including complex, overlapped peaks and apparent heat capacities. The models applied can be of great interest in understanding the phenomena involved, as well as in modeling the heat effects in the whole processing or pyrolysis of this type of multicomponent products. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163288 [article] Thermal treatment and degradation of cross - linked ethylene vinyl acetate – polyethylene – azodicarbonamide – ZnO foams. complete kinetic modeling and analysis [texte imprimé] / Juan A. Reyes-Labarta, Auteur ; A. Marcilla, Auteur . - 2012 . - pp. 9515-9530. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 28 (Juillet 2012) . - pp. 9515-9530 Mots-clés : Modeling  Kinetic  model  Foam  Heat  treatment Résumé : The cross-linking and foaming processes of ethylene vinyl acetate (EVA) copolymer with different concentrations of polyethylene (PE), cross-linking agent (α-α'-bis(tert-butylperoxy)-m/p-diisopropylbenzene), and azodicarbonamide (as foaming agent and using additionally ZnO as accelerating agent) have been studied. The extent of the reactions has been evaluated by gel fraction and density measurements. The different transitions involved in the thermal processing and decomposition have been studied by DSC and TGA and compared for all the mixtures prepared. Mechanistic pseudokinetic models have been suggested and applied involving all the fractions susceptible of undergoing transitions or reactions, including complex, overlapped peaks and apparent heat capacities. The models applied can be of great interest in understanding the phenomena involved, as well as in modeling the heat effects in the whole processing or pyrolysis of this type of multicomponent products. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26163288