Documents disponibles écrits par cet auteur

An iterated eigenvalue algorithm for vapor – liquid split in flash calculations / Rosendo Monroy-Loperena in Industrial & engineering chemistry research, Vol. 51 N° 25 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8488-8494 Titre : An iterated eigenvalue algorithm for vapor – liquid split in flash calculations Type de document : texte imprimé Auteurs : Rosendo Monroy-Loperena, Auteur Année de publication : 2012 Article en page(s) : pp. 8488-8494 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Algorithm Résumé : Flash calculations are used extensively in computer-aided process simulation programs. Inherent to flash calculations is the determination of the vapor―liquid split. Currently, to calculate the vapor―liquid split, the Rachford―Rice calculations is the detemvnation of the vapor―liquid split. Currently, to calculate the vapor―liquid split, the Itachford―Rice equation is the most accepted method. In this work, it is shown that the Rachford―Rice equation can be posed as a generalized eigenvalue problem, where each eigenvalue of the resulting system is exactly a root of the Rachford-Rice equation. In this way, an ad hoc strategy based on linear algebra is proposed for finding the vapor―liquid split. The main advantage of the proposed strategy is that the resulting linear system has an almost-diagonal structure and generates a discrepancy function with a more linear shape than that of the Rachford―Rice equation. In this way, the solution of the system is simple and computationally inexpensive. Numerical experiments show the reliability of the proposed solution strategy for calculating the vapor―liquid split. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066776 [article] An iterated eigenvalue algorithm for vapor – liquid split in flash calculations [texte imprimé] / Rosendo Monroy-Loperena, Auteur . - 2012 . - pp. 8488-8494. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8488-8494 Mots-clés : Algorithm Résumé : Flash calculations are used extensively in computer-aided process simulation programs. Inherent to flash calculations is the determination of the vapor―liquid split. Currently, to calculate the vapor―liquid split, the Rachford―Rice calculations is the detemvnation of the vapor―liquid split. Currently, to calculate the vapor―liquid split, the Itachford―Rice equation is the most accepted method. In this work, it is shown that the Rachford―Rice equation can be posed as a generalized eigenvalue problem, where each eigenvalue of the resulting system is exactly a root of the Rachford-Rice equation. In this way, an ad hoc strategy based on linear algebra is proposed for finding the vapor―liquid split. The main advantage of the proposed strategy is that the resulting linear system has an almost-diagonal structure and generates a discrepancy function with a more linear shape than that of the Rachford―Rice equation. In this way, the solution of the system is simple and computationally inexpensive. Numerical experiments show the reliability of the proposed solution strategy for calculating the vapor―liquid split. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26066776

Dual composition control in continuous, middle - vessel distillation columns, with a draw stream in the middle vessel / Rosendo Monroy-Loperena in Industrial & engineering chemistry research, Vol. 51 N° 12 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4624–4631 Titre : Dual composition control in continuous, middle - vessel distillation columns, with a draw stream in the middle vessel Type de document : texte imprimé Auteurs : Rosendo Monroy-Loperena, Auteur ; José Alvarez-Ramírez, Auteur Année de publication : 2012 Article en page(s) : pp. 4624–4631 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Distillation  Continuous  middle Résumé : The dual composition control problem for a class of continuous middle-vessel distillation, which accepts a draw stream in the middle vessel, is studied in this work. This distillation configuration is advantageous when the separation goal is to recover high-purity light and heavy components from a multicomponent mixture with sufficiently large separation between relative volatilities. By using an estimator of the input–output modeling error, a first-order output-feedback compensator is designed which is shown to be equivalent to a multi-input multi-output proportional–integral (MIMO PI) controller. Tuning issues in terms of two time constants are given, and the ability of the controller to regulate the distillate and bottom product compositions in the face of sampled/delayed measurements is shown via numerical simulations. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie203018k [article] Dual composition control in continuous, middle - vessel distillation columns, with a draw stream in the middle vessel [texte imprimé] / Rosendo Monroy-Loperena, Auteur ; José Alvarez-Ramírez, Auteur . - 2012 . - pp. 4624–4631. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 12 (Mars 2012) . - pp. 4624–4631 Mots-clés : Distillation  Continuous  middle Résumé : The dual composition control problem for a class of continuous middle-vessel distillation, which accepts a draw stream in the middle vessel, is studied in this work. This distillation configuration is advantageous when the separation goal is to recover high-purity light and heavy components from a multicomponent mixture with sufficiently large separation between relative volatilities. By using an estimator of the input–output modeling error, a first-order output-feedback compensator is designed which is shown to be equivalent to a multi-input multi-output proportional–integral (MIMO PI) controller. Tuning issues in terms of two time constants are given, and the ability of the controller to regulate the distillate and bottom product compositions in the face of sampled/delayed measurements is shown via numerical simulations. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie203018k

A note on the analytical solution of cubic equations of state in process simulation / Rosendo Monroy-Loperena in Industrial & engineering chemistry research, Vol. 51 N° 19 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6972-6976 Titre : A note on the analytical solution of cubic equations of state in process simulation Type de document : texte imprimé Auteurs : Rosendo Monroy-Loperena, Auteur Année de publication : 2012 Article en page(s) : pp. 6972-6976 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermodynamic  properties  Equations  of  state Résumé : This work address the problem of round-off errors in the analytical solution (Cardano's Method) of cubic equations of state inside the simulation of chemical processes in the low-temperature region, as it is the case of cryogenic processes involving hydrates calculations. It is proposed as a strategy that can be taken as an iterative refinement of the solution obtained by the analytical method and allows one to take advantage of the calculations fulfilled in the application of the analytical solution (Cardano's Method). Numerical experimentations are presented in order to show the application of the proposed strategy. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900252 [article] A note on the analytical solution of cubic equations of state in process simulation [texte imprimé] / Rosendo Monroy-Loperena, Auteur . - 2012 . - pp. 6972-6976. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 19 (Mai 2012) . - pp. 6972-6976 Mots-clés : Thermodynamic  properties  Equations  of  state Résumé : This work address the problem of round-off errors in the analytical solution (Cardano's Method) of cubic equations of state inside the simulation of chemical processes in the low-temperature region, as it is the case of cryogenic processes involving hydrates calculations. It is proposed as a strategy that can be taken as an iterative refinement of the solution obtained by the analytical method and allows one to take advantage of the calculations fulfilled in the application of the analytical solution (Cardano's Method). Numerical experimentations are presented in order to show the application of the proposed strategy. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25900252