Stability of Adiabatic Reactors

Ionic liquids (IL) are the focus of growing interest over the last few years due to their low vapour pressure being beneficial for replacing common organic solvents with high vapour pressure. IL synthesised via alkylation are produced in batch or semi-batch stirred tank reactors. The reaction is highly exothermic and the kinetics was shown to be fast. The heat management during the reactor operation is a crucial point leading to high quality IL product and avoiding thermal runaway. This study reports the use of a microstructured reactor (MSR) system for the production of ethylmethylimidazole ethylsulfate by a solvent-free alkylation reaction. A combination of MSR and two tubular capillary reactors operating at two different cooling temperatures has been proposed. The save and stable operation of this reactor system is proven experimentally rendering the IL of high quality. The specific reactor performance was about 4 kg m −3 s −1 being ca. 3 orders of magnitude higher as compared to more traditional reactors.

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“…For given reaction kinetics the thermal behaviour of a tubular reactor depends on three different parameters [10]:…”

Section: Maximum Cooling Temperature For Stable Reactor Operationmentioning

confidence: 99%

Ionic liquid synthesis in a microstructured reactor for process intensification

Renken

Hessel

Löb

et al. 2007

Chemical Engineering and Processing: Process Intensification

101

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“…Esto lo hicieron empleando los criterios de Barkelew (1959) y de Villermaux y Georgakis (1991).Sin embargo, no definieron cuantitativamente los valores de las variables operacionales que limitan la sensibilidad paramétrica del sistema reactivo. En el presente trabajo se establece una concentración crítica de anhídrido acético en función de la concentración de catalizador.…”

Section: Resultados Y Discusiónunclassified

“…Para este sistema reactivo, se encuentran disponibles en la literatura datos experimentales de la variación de la temperatura de reacción en función de la concentración del ácido sulfúrico (Shukla y Pushpavanam, 1994).Así, con base en esos resultados experimentales, se construye el plano de fases temperatura -concentración a partir del cual se deducen dos criterios concretos para el sistema bajo estudio. Los resultados obtenidos se comparan con los reportados por Shukla y Pushpavanam (1994), quienes realizaron un análisis de sensibilidad paramétrica básico fundamentado en los criterios propuestos por Barkelew (1959) y Villermaux y Georgakis (1991).…”

Section: Introductionunclassified

Sensibilidad Paramétrica y Condiciones Seguras de Operación de la Hidrólisis del Anhídrido Acético en un Reactor Batch

et al. 2016

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“…Moreover, for less active beds the stability is higher because the stable zone is larger, which corresponds to a gain in the critical methanol concentration of 20% for a feed temperature of 530 K. For higher inlet temperatures it was possible to observe gains of 40%. Figure 8 corresponds to a classical runaway diagram which was first presented by Barkelew,37 where continuous lines represent the boundaries between the safe region and the runaway region for different catalytic activity profiles, and the dashed lines joined points that are related to the same inlet temperature. In this diagram we represented two curves for the partially diluted bed.…”

Section: Computer Resultsmentioning

confidence: 99%

Thermal Runaway Conditions of a Partially Diluted Catalytic Reactor

Quina

Ferreira

1999

Ind. Eng. Chem. Res.

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The generalized parametric sensitivity criterion was used to obtain runaway diagrams for oneand two-dimensional heterogeneous models and a one-dimensional pseudo-homogeneous model. The simulation work was based on the partial methanol oxidation to formaldehyde, which occurs in a fixed-bed reactor, with two distinct catalytic zones. At the inlet of the reactor, the catalyst was diluted with inert packing followed by a region with pure catalyst. This activity profile induces a reduction in the parametric sensitivity of the process to temperature runaway, when compared to a uniform activity bed, and the sensitivity functions reach a minimum when the inlet temperature is in the range of 530-540 K. The dilution of the catalytic bed leads to an enlargement of the stable region of operation, which allows a gain in the critical methanol concentration of 20% for a feed temperature of 530 K (industrial operating temperature), higher gains being possible (∼40%) for higher inlet temperatures. Moreover, depending on the particular set of the operating conditions, one or two hot spots can be developed, one in each zone of the bed, it being important to follow both because one or the other can determine the critical conditions of the system. The additional mass flux by intraparticle convection leads to an increase in the parametric sensitivity when compared with the case where diffusion is the only mechanism taken into account.

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Stability of Adiabatic Reactors

Cited by 35 publications

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Ionic liquid synthesis in a microstructured reactor for process intensification

Ionic liquid synthesis in a microstructured reactor for process intensification

Sensibilidad Paramétrica y Condiciones Seguras de Operación de la Hidrólisis del Anhídrido Acético en un Reactor Batch

Thermal Runaway Conditions of a Partially Diluted Catalytic Reactor

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