Documents disponibles écrits par cet auteur

Mass integration as a design heuristic / Carlos D. Fischer in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12664-12677 Titre : Mass integration as a design heuristic : improvements in the HDA process Type de document : texte imprimé Auteurs : Carlos D. Fischer, Auteur ; Oscar A. Iribarren, Auteur Année de publication : 2012 Article en page(s) : pp. 12664-12677 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mass  integration  Design Résumé : This paper explores mass exchanging the outlet and inlet streams of a reactor, as a design heuristic within the hierarchical process design procedure by Douglas [AlChE J. 1985, 31 (3), 353-361 and Conceptual Design of Chemical Processes; McGraw-Hill, 1988], who worked on the HDA process to test the proposal. The heuristic is used at an early stage of the hierarchy, when deciding the recycle and separation system structure of the process. If the reaction requires operating conditions with reactants in excess or that catalyze the reaction, which must be removed after the reaction, there is a concentration gradient between the inlet and outlet streams that may be used as the driving force in a mass exchanger (if such a device is available for the particular case). When applied to the HDA process, this methodology generated alternatives different from the previously proposed by other authors by resorting to a ceramic membrane gas permeation unit to perform the mass exchange of hydrogen. The performance of applying the heuristic was tested comparing the flow sheets proposed by several authors with and without this mass exchanger. The success of implementing this mass exchange networks synthesis concept was dependent on the concentration of the component to be transferred in the rich stream (i.e., it works if there is an appropriate driving force). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745741 [article] Mass integration as a design heuristic : improvements in the HDA process [texte imprimé] / Carlos D. Fischer, Auteur ; Oscar A. Iribarren, Auteur . - 2012 . - pp. 12664-12677. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12664-12677 Mots-clés : Mass  integration  Design Résumé : This paper explores mass exchanging the outlet and inlet streams of a reactor, as a design heuristic within the hierarchical process design procedure by Douglas [AlChE J. 1985, 31 (3), 353-361 and Conceptual Design of Chemical Processes; McGraw-Hill, 1988], who worked on the HDA process to test the proposal. The heuristic is used at an early stage of the hierarchy, when deciding the recycle and separation system structure of the process. If the reaction requires operating conditions with reactants in excess or that catalyze the reaction, which must be removed after the reaction, there is a concentration gradient between the inlet and outlet streams that may be used as the driving force in a mass exchanger (if such a device is available for the particular case). When applied to the HDA process, this methodology generated alternatives different from the previously proposed by other authors by resorting to a ceramic membrane gas permeation unit to perform the mass exchange of hydrogen. The performance of applying the heuristic was tested comparing the flow sheets proposed by several authors with and without this mass exchanger. The success of implementing this mass exchange networks synthesis concept was dependent on the concentration of the component to be transferred in the rich stream (i.e., it works if there is an appropriate driving force). DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745741

Synthesis of a mass integrated biodiesel process / Carlos D. Fischer in Industrial & engineering chemistry research, Vol. 50 N° 11 (Juin 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6849-6859 Titre : Synthesis of a mass integrated biodiesel process Type de document : texte imprimé Auteurs : Carlos D. Fischer, Auteur ; Oscar A. Iribarren, Auteur Année de publication : 2011 Article en page(s) : pp. 6849-6859 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Mass  integrated  Biodiesel  process Résumé : A hierarchical decision procedure is proposed for the synthesis of processes that are mass integrated to an existing industrial environment. The procedure takes the information about already installed processes as input. Decisions required to complete the design of the new process are then made considering this environment. The procedure decides among alternative technologies for producing the new product and on the use of output streams from the environment as inputs to the new process and vice versa. It also decides whether this use should be done through new processing facilities to condition these streams. The hierarchical decision procedure described by Douglas was adapted to include these mass integration decisions and to resort to mass exchange network synthesis and source-sink allocation procedures at the appropriate level of the hierarchy. The procedure is illustrated by designing a new biodiesel process, integrated to the agro-industrial complex already existing in the city of Reconquista, Argentina. The alternative technologies considered for producing biodiesel are acid, basic, and enzymatic catalyzed transesterification processes. The considered raw materials are a pretreated stream from an edible oils refinery and residual fatty streams from other factories, with high free fatty acid content. The acid raw materials could be converted to biodiesel either directly through an acid process or after an esterification treatment through the same basic process that is utilized for good quality edible oils raw material The produced biodiesel could be sold to oil companies or to the local agro-machinery business. The raw glycerin byproduct could be sold as glycerin after purification, fermented to ethanol in a cereals bioethanol factory, used as fuel in properly designed boilers, or used in the formulation of cattle food in local feed lots. This paper discusses (i) the trade-off between implementing mass exchangers or separation processes in the case of methanol added in excess and alkali added as a catalyst in the reaction step, (ii) the adaptation ofthe standard source sink allocation approach adding constraints of the diet problem, and (iii) the order of decisions in the hierarchy, which strongly affects the programming effort to solve this synthesis and design problem. Results analysis shows that both the economic and environmental performance of the biodiesel process is significantly improved when taking into account the local industrial environment of the new plant. Furthermore, as the integrated plant is able to process multiple raw materials and offer alternative product specifications to end consumers, its operation is adjustable to changing market conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199902 [article] Synthesis of a mass integrated biodiesel process [texte imprimé] / Carlos D. Fischer, Auteur ; Oscar A. Iribarren, Auteur . - 2011 . - pp. 6849-6859. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 11 (Juin 2011) . - pp. 6849-6859 Mots-clés : Mass  integrated  Biodiesel  process Résumé : A hierarchical decision procedure is proposed for the synthesis of processes that are mass integrated to an existing industrial environment. The procedure takes the information about already installed processes as input. Decisions required to complete the design of the new process are then made considering this environment. The procedure decides among alternative technologies for producing the new product and on the use of output streams from the environment as inputs to the new process and vice versa. It also decides whether this use should be done through new processing facilities to condition these streams. The hierarchical decision procedure described by Douglas was adapted to include these mass integration decisions and to resort to mass exchange network synthesis and source-sink allocation procedures at the appropriate level of the hierarchy. The procedure is illustrated by designing a new biodiesel process, integrated to the agro-industrial complex already existing in the city of Reconquista, Argentina. The alternative technologies considered for producing biodiesel are acid, basic, and enzymatic catalyzed transesterification processes. The considered raw materials are a pretreated stream from an edible oils refinery and residual fatty streams from other factories, with high free fatty acid content. The acid raw materials could be converted to biodiesel either directly through an acid process or after an esterification treatment through the same basic process that is utilized for good quality edible oils raw material The produced biodiesel could be sold to oil companies or to the local agro-machinery business. The raw glycerin byproduct could be sold as glycerin after purification, fermented to ethanol in a cereals bioethanol factory, used as fuel in properly designed boilers, or used in the formulation of cattle food in local feed lots. This paper discusses (i) the trade-off between implementing mass exchangers or separation processes in the case of methanol added in excess and alkali added as a catalyst in the reaction step, (ii) the adaptation ofthe standard source sink allocation approach adding constraints of the diet problem, and (iii) the order of decisions in the hierarchy, which strongly affects the programming effort to solve this synthesis and design problem. Results analysis shows that both the economic and environmental performance of the biodiesel process is significantly improved when taking into account the local industrial environment of the new plant. Furthermore, as the integrated plant is able to process multiple raw materials and offer alternative product specifications to end consumers, its operation is adjustable to changing market conditions. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24199902