Jean-Léon Houzelot
École nationale supérieure des industries chimiques
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Featured researches published by Jean-Léon Houzelot.
Chemical Engineering Science | 1977
Jean-Léon Houzelot; Jacques Villermaux
Abstract Radial diffusional mass transfer is studied in a fluid flowing in fully developed laminar flow in an annular cylindrical reactor in which a first order heterogeneous reaction is taking place at the wall. The asymptotic behaviour of the concentration decrease far from the reactor inlet is especially investigated. Limiting values of Sherwood numbers are numerically determined and represented by semi-empirical expressions. Additivity relationships between homogeneous and heterogeneous contributions are established. Theoretical results are found in excellent agreement with those yielded by a new experimental method based on heterogeneous decomposition of ozone. Annular reactors exhibit a mass transfer efficiency which is noticeably higher than that of empty tubes. This efficiency may be characterized by three criteria related to inner space utilization, catalytic surface utilization and/or mechanical energy degradation.
Chemical Engineering Science | 1992
Sylvie Marchal-Brassely; Jacques Villermaux; Jean-Léon Houzelot; Jean-Louis Barnay
A heuristic method was developed, which is both fast and efficient to identify stoichiometric and kinetic tendency models for reaction taking place in batch or semi-batch reactors. A general control strategy for simultaneous optimization of temperature and feed rate profiles together with usual control parameters was also developed. The method is fairly robust with respect to analytical inaccuracies as only convergence to optimal conditions is looked at. The method relying on both algorithms was found very performing by several validations issued from real life industrial problems. On these occasions the fast determination of the optimal operating conditions was especially appreciated
The Chemical Engineering Journal and The Biochemical Engineering Journal | 1996
Philippe Salaün; Jean-Léon Houzelot; Jacques Villermaux; Sylvie Marchal
An efficient method based on tendency modelling is presented to design operating conditions aiming at optimization of end-use properties of a terpolymer used as a viscosity index improver. In order to implement this strategy, a copolymerization model and relationships between the terpolymer structure and the properties are set up according to a sequential procedure. Six preliminary runs were required to start the process. Further runs were performed according to the predictions of an adaptive tendency model in order to minimize a performance index related to reaction time and end-use properties of the terpolymer. It was found that quasi-optimal conditions were reached after only four runs calculated according to this method.
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science | 2000
Fabrice Patisson; Etienne Lebas; François Hanrot; Jean-Léon Houzelot
Chemical Engineering Journal | 2006
Nader Frikha; Eric Schaer; Jean-Léon Houzelot
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science | 2000
Fabrice Patisson; Etienne Lebas; François Hanrot; Jean-Léon Houzelot
Powder Technology | 2013
Marie Debacq; Stéphane Vitu; Jean-Léon Houzelot; Fabrice Patisson
Chemical Engineering Science | 2013
Marie Debacq; Phahath Thammavong; Stéphane Vitu; Jean-Léon Houzelot; Fabrice Patisson
Thermochimica Acta | 2006
Nader Frikha; Eric Schaer; Jean-Léon Houzelot
Thermochimica Acta | 2005
Nader Frikha; Eric Schaer; Jean-Léon Houzelot