Experimental study on the optimum performance of an adiabatic MT reactor

The intensified technologies offer new prospects for the development of hazardous chemical syntheses in safer conditions: the idea is to reduce the reaction volume by increasing the thermal performances and preferring the continuous mode to the batch one. In particular, the Open Plate Reactor (OPR) type "reactor/exchanger" also including a modular block structure, matches these characteristics perfectly. The aim of this paper is to study the OPR behaviour during a normal operation, that is to say, after a stoppage of the circulation of the cooling fluid. So, an experiment was carried out, taking the oxidation of sodium thiosulfate with hydrogen peroxide as an example. The results obtained, in particular with regard to the evolution of the temperature profiles of the reaction medium as a function of time along the apparatus, are compared with those predicted by a dynamic simulator of the OPR. So, the average heat transfer coefficient regarding the "utility" fluid is evaluated in conductive and natural convection modes, and then integrated in the simulator. The conclusion of this study is that, during a cooling failure, a heat transfer by natural convection would be added to the conduction, which contributes to the intrinsically safer character of the apparatus.

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“…The reaction enthalpy is -586.2 kJ.mol -1 of Na 2 S 2 O 3 (Lo et al, 1972). The operating temperature does not usually exceed 40°C.…”

Section: Case Study: Oxidation Of Sodium Thiosulfate With Hydrogen Pementioning

confidence: 99%

Dynamic Behaviour of a Continuous Heat Exchanger/Reactor after Flow Failure

Benaissa¹,

Elgue²,

Gabas³

et al. 2008

International Journal of Chemical Reactor Engineering

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“…This liquid homogeneous reaction is irreversible, fast, and highly exothermic [16]. The heat generated by the reaction is H r = −586.2 kJ-mol −1 of Na 2 S 2 O 3 .…”

Section: Oxidation Reactionmentioning

confidence: 99%

Transposition of an Exothermic Reaction From a Batch Reactor to an Intensified Continuous One

Anxionnaz¹,

Cabassud²,

Gourdon³

et al. 2010

Heat Transfer Engineering

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The implementation of chemical syntheses in a batch or semi-batch reactor is generally limited by the removal or the supply of heat. A way to enhance thermal performances is to develop multifunctional devices like heat exchanger/reactors. In this work, a novel heat exchanger/reactor is characterized in terms of residence time, pressure drops, and thermal behavior in order to estimate its capacities to perform an exothermic reaction: the oxidation of sodium thiosulfate by hydrogen peroxide. Experimental results highlight the performances of the heat exchanger/reactor in terms of intensification, which allows the implementation of the oxidation reaction at extreme operating conditions. These conditions are finally compared to the ones of a classical batch reactor.

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“…The geometrical and physical parameters of the tubular reactor are indicated in Table I. The fast kinetics chemical reaction chosen for this study is sodium thiosulfate oxidation by hydrogen peroxide [Cohen, 1962], [Lo, 1972], [Brungs, 1988]. This reaction is a model for safety studies [Aimé, 1991], [Grau, 2000], [Grau, 2002], [Prat, 2005], [Orantes, 2007], [Benaissa, 2008].…”

Section: Figurementioning

confidence: 99%

New Analytical Method for Maximum Temperature Assessment in an Exothermic Tubular Chemical Reactor

Vernières‐Hassimi

Assoudi-Baikari

Abdelghani-Idrissi

et al. 2014

Chemical Engineering Communications

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This paper deals with an analytical method to assess the maximum temperature value along a tubular chemical reactor at steady state. This reactor is provided with a jacket in which a counter current cooling liquid flows.The thermal behaviour of the chemical reactor is calculated with the McCormack numerical method. Comparison of the exothermic reaction generated flux with the removed flux from the separating wall leads to a two-part reactor subdivision.In the first part, the reactor behaves as an adiabatic reactor followed by a zone in which the flux removed from the wall is not negligible and remains constant. In the second part, the reactor behaves like a simple heat exchanger without internal energy source.Analytical integration of mass and energy balance equations in each subsystem was used to determine the analytical expression of maximum temperature.

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Experimental study on the optimum performance of an adiabatic MT reactor

Cited by 29 publications

References 14 publications

Dynamic Behaviour of a Continuous Heat Exchanger/Reactor after Flow Failure

Dynamic Behaviour of a Continuous Heat Exchanger/Reactor after Flow Failure

Transposition of an Exothermic Reaction From a Batch Reactor to an Intensified Continuous One

New Analytical Method for Maximum Temperature Assessment in an Exothermic Tubular Chemical Reactor

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