Performance of an adiabatic controlled cycled stirred tank reactor (2023)

Cited by (11)

  • Characterization of the performances of an innovative heat-exchanger/reactor

    2014, Chemical Engineering and Processing: Process Intensification

    The use of heat exchanger/reactors (HEX/reactors) is a promising way to overcome the barrier of poor heat transfer in batch reactors. However to reach residence time long enough to complete the chemistry, low Reynolds number has to be combined with both a plug flow behaviour and the intensification of heat and mass transfers. This work concerns the experimental approach used to characterize an innovative HEX/reactor. The pilot is made of three process plates sandwiched between five utility plates. The process stream flows in a 2mm corrugated channel. Pressure drop and residence time distribution characterizations aim at studying the flow hydrodynamics. Identified Darcy correlations point out the transition between laminar and turbulent flow around a Reynolds number equal to 200. Moreover the flow behaves like a quasi-plug flow (Pe>185). The heat transfer and mixing time have also been investigated. The ratio between the reaction kinetics and the mixing time is over 100 and the intensification factor ranges from 5000 to 8000kWm−3K−1. As a consequence, no limitations were identified which allows the implementation of an exothermic reaction. It has been successfully performed under severe temperature and concentration conditions, batchwise unreachable. Thus, it highlights the interest of using this continuous HEX/reactor.

  • Parameter estimation with genetic algorithm in control of fed-batch reactors

    2002, Chemical Engineering and Processing

    The temperature control strategy of a fed-batch reactor has been presented. The fed-batch operation is very useful to increase the productivity in some type of batch reactors but may incur in reactant overdose, which in case of exothermic reaction would result in possible runaway condition. The main problem is to get the best feeding profile (temporal trajectory) to minimize the reaction time with a temperature constraint. The genetic algorithm (GA) has been used for this task and the profile obtained has been used to drive a pilot scale experimental reactor. This work also demonstrates the usefulness of the GA in parameter estimation of first principle models.

  • Batch and semibatch reactor performance for an exothermic reaction

    2000, Chemical Engineering and Processing: Process Intensification

    In this work, a study of a batch and semibatch reactor has been carried out based on a very exothermic reaction between thiosulfate and hydrogen peroxide. The experiments were carried out in a glass-jacketed reactor of 5 l, provided with different sensors and a data acquisition system. Thermal and kinetic studies were carried out previously using an adiabatic batch reactor. Then, these results have been used for experiments in semibatch mode of operation with heat transfer. Several experiments have been carried out at different operating conditions (addition flow, initial temperature, initial concentration of reagents…). In batch and adiabatic mode of operation, experimental measures of the reaction mass temperature provided concentration profiles of reagents and products which have been compared to those determined by simulation. In semibatch mode of operation, temperature profiles have also been simulated and validated with experimental results. An algorithm describing the mathematical model has been developed and implemented in a software module written in FORTRAN 77 language. With this mathematical model it has been possible to obtain concentration and heat profiles for the semibatch mode of operation.

  • Data from simulation studies of the hydrogen peroxide-sodium thiosulphate and hydrogen peroxide-potassium dichromate reactions were employed to select experimental parameters for the study of metastable states in stirred reactors using microprocessor control. The peroxide-thiosulphate system was found to closely approximate the simulation results and microprocessor control within the metastable region was achieved using a simple proportional+integral (PI) control algorithm. With the peroxide-chromate reaction, existing kinetic data had to be corrected for pH effects to enable accurate simulation. The existence of metastable states in this system was demonstrated experimentally, and microprocessor control within the metastable region was again possible using the same PI control algorithm.

  • Pulse testing of an agitated vessel

    1987, Chemical Engineering Science

    The dynamic study of an agitated insulated vessel was performed using the pulse test method. Adequate pulse characteristics which will disturb a first- and a second-order system in a single pulse test were found by analysing the effects of pulse height and duration, integration step size in computation and the type of approximation used on the accuracy of the results. The theoretical multivariable matrix for the system was found and the best manipulated-controlled variable couples were determined by Bristol's technique.

  • Multiplicity of conversion in a cascade of imperfectly stirred tank reactors

    1983, Chemical Engineering Science

    The multiple steady states of conversion in the model of non-ideal CSTR's in series have been studied for irreversible, homogeneous exothermic reaction of first order. The influences of the parameters p and n and those of some kinetic parameters on the occurrence of multiple conversions for a given residence time are presented. The existence of steady-state multiplicity of conversion in each CSTR is shown to be independent of n and depen largely on the values of E/RT0 (activation energy), b/T0 (heat of reaction), and p. For certain parametric values, more than three steady states can exist in such a model.

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Copyright © 1981 Published by Elsevier Ltd.

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