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Dive into the research topics where Jean-Léon Houzelot is active.

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Featured researches published by Jean-Léon Houzelot.


Chemical Engineering Science | 1977

Mass transfer in annular cylindrical reactors in laminar flow

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

Optimal operation of a semi-batch reactor by self-adaptive models for temperature and feed-rate profiles

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

Sequential method for the determination of operating conditions for optimizing end-use properties of a terpolymer

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

Coal pyrolysis in a rotary kiln : Part II. Overall model of the furnace

Fabrice Patisson; Etienne Lebas; François Hanrot; Jean-Léon Houzelot


Chemical Engineering Journal | 2006

Methodology of multiphase reaction kinetics and hydrodynamics identification : Application to catalyzed nitrobenzene hydrogenation

Nader Frikha; Eric Schaer; Jean-Léon Houzelot


Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science | 2000

Coal pyrolysis in a rotary kiln: Part I. Model of the pyrolysis of a single grain

Fabrice Patisson; Etienne Lebas; François Hanrot; Jean-Léon Houzelot


Powder Technology | 2013

Transverse motion of cohesive powders in flighted rotary kilns: experimental study of unloading at ambient and high temperatures

Marie Debacq; Stéphane Vitu; Jean-Léon Houzelot; Fabrice Patisson


Chemical Engineering Science | 2013

A hydrodynamic model for flighted rotary kilns used for the conversion of cohesive uranium powders

Marie Debacq; Phahath Thammavong; Stéphane Vitu; Jean-Léon Houzelot; Fabrice Patisson


Thermochimica Acta | 2006

Experimental study and modelling of thermal runaway : Application to dichromate catalysed hydrogen peroxide decomposition

Nader Frikha; Eric Schaer; Jean-Léon Houzelot


Thermochimica Acta | 2005

Study of the dichromate-catalysed hydrogen peroxide decomposition : Comparison of different batch mode reactors for the kinetics determination

Nader Frikha; Eric Schaer; Jean-Léon Houzelot

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Marie Debacq

Conservatoire national des arts et métiers

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Eric Schaer

École nationale supérieure des industries chimiques

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Jacques Villermaux

École nationale supérieure des industries chimiques

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Nader Frikha

École nationale supérieure des industries chimiques

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Stéphane Vitu

Conservatoire national des arts et métiers

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Phahath Thammavong

Conservatoire national des arts et métiers

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Philippe Salaün

École nationale supérieure des industries chimiques

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