Investigation of mixing in a rotor shape modified Taylor-vortex reactor by the means of a chemical test reaction

Richter, Oliver; Menges, med.dent. Joachim; Kraushaar‐Czarnetzki, Bettina

doi:10.1016/j.ces.2009.02.015

Cited by 14 publications

(9 citation statements)

References 18 publications

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“…The results show good agreement with those found by other investigators, as can be seen in the following equation, where the different literature data for rate constants were summarized by Richter et al 13: …”

Section: Resultssupporting

confidence: 91%

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The enthalpy and entropy of activation for ethyl acetate saponification

Petek

Krajnc

2012

Int J of Chemical Kinetics

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The saponification of ethyl acetate was measured by conductimetry at different temperatures within a batch reactor. A new mathematical model for obtaining concentration profiles from conductivity was presented and used for reaction-kinetics' determination. The Arrhenius parameters (A, E a ) showed good agreement with the previously published values. Basic transition-state theory was used for obtaining the Gibbs energy ( G ‡ ), the enthalpy ( H ‡ ), and the entropy ( S ‡ ) of activation. The low enthalpy of activation and negative entropy of activation were consistent with a reaction pathway when forming a transition-state complex. The suggested mechanism involves OH − , acting as a general base for removing proton from one of the hydroxide hydrating water, placed directly between it and the ester. The nucleophile from the water then attacks at the electrophilic C of the ester, breaking the π bond, and creating a tetrahedral intermediate. C

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Section: Resultssupporting

confidence: 91%

“…Arrhenius plot for ethyl acetate saponification using the data presented in Table II. the following equation, where the different literature data for rate constants were summarized by Richter et al [13]: …”

Section: Figurementioning

confidence: 99%

The enthalpy and entropy of activation for ethyl acetate saponification

Petek

Krajnc

2012

Int J of Chemical Kinetics

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“…26,27 The impact of configuration variation on the micromixing performance, especially the inner cylinder alteration, is still rarely studied in the literature. Richter et al 28 With a better understanding of the mixing and chemical reactions, Villermaux et al 34 and Fournier et al 30 proposed the use of a parallel competing scheme based on the iodide-iodate reaction system. Generally, the products produced in such a system are easily analyzed by using the spectrophotometric method.…”

Section: Introductionmentioning

confidence: 99%

“…The impact of configuration variation on the micromixing performance, especially the inner cylinder alteration, is still rarely studied in the literature. Richter et al 28 compared mixing performance of the classical TC reactor and a novel TC reactor with ribbed rotor assembled in laminar flows with Reynolds numbers smaller than 2.0. In order to test the micromixing performance down to the molecular level, they adopted alkaline saponification of ethylacetate as the reactive system.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrodynamic heterogeneity on micromixing intensification in a Taylor–Couette flow reactor with variable configurations of inner cylinder

Liu

Yang

et al. 2021

AIChE Journal

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Effect of hydrodynamic heterogeneity on micromixing intensification in a Taylor-Couette flow (TC) reactor with variable configurations of inner cylinder has been investigated by adoption of a parallel competing iodide-iodate reaction system. Two types of inner cylinder, circular inner cylinder and lobed inner cylinder (CTC and LTC), were used to generate hydrodynamic heterogeneity, focusing on the effects of the Reynolds number, the acid concentration, and the feeding time on the micromixing performance. Segregation index (Xs) was employed to evaluate the micromixing efficiency. It is revealed that Xs decreases with the increase of Reynolds number and feeding time but increases with the increase of acid concentration for both the CTC and LTC. However, the LTC does present a better micromixing performance at various operating conditions than that of the CTC as affirmed by both the experimental and computational fluid dynamics simulation results.

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“…The introduction of slits or fins over the cylinder surfaces is a great innovation that is directly applicable to the control of chemical processes, such as mixing. In order to increase mixing efficiency, Richter et al (2009) disturbed the Taylor-Couette flow by modifying the rotor surface introducing annular fins to investigate the mixing of a saponification of ethylacetate. They found that the mixing processes were optimized by these perturbations, but the changes on the flow were not described; moreover, just one finned-system configuration was tested and compared to a smooth rotor.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Taylor-Couette Flow with Finned Surface Rotation

Álvarez¹,

Vicente²,

Solorio³

et al. 2019

JAFM

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In this study, the Taylor-Couette flow was disturbed by incorporating annular fins over the inner rotating surface. The finned surface had three parameters: height, width, and length between fins. In this work, seven different fin configurations, in which only the fin height varied, were examined and compared using experimental and numerical techniques. We found that annular fins disturbed the flow behavior by reducing the smooth critical Taylor number (Ta=57.18), but more important, we noticed a vortex enlargement induced by the incorporation of a relatively modest perturbation (b´<0.5) and this change remained in a wider range (0.57

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Investigation of mixing in a rotor shape modified Taylor-vortex reactor by the means of a chemical test reaction

Cited by 14 publications

References 18 publications

The enthalpy and entropy of activation for ethyl acetate saponification

The enthalpy and entropy of activation for ethyl acetate saponification

Effect of hydrodynamic heterogeneity on micromixing intensification in a Taylor–Couette flow reactor with variable configurations of inner cylinder

A Study of the Taylor-Couette Flow with Finned Surface Rotation

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