Intensification of the rate of diffusion controlled catalytic and electrochemical reactions in a new stirred tank reactor with a multi cylindrical blade impeller

El-Gayar, Dina Ahmed; Konsowa, A.H.; El-Taweel, Y.A.; Farag, H.A.; Sedahmed, G.H.

doi:10.1016/j.cherd.2015.12.019

Cited by 8 publications

(2 citation statements)

References 22 publications

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“…the internal vessel geometry or configuration (baffles, coils, vessel bottom type, etc. [3][4][5][6]); -the fluid properties (densities, number of phases, a viscosity [7]);…”

Section: Introductionmentioning

confidence: 99%

A General Review of the Current Development of Mechanically Agitated Vessels

Jaszczur

Młynarczykowska

2020

Processes

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The mixing process in a mechanically agitated vessel is a widespread phenomenon which plays an important role among industrial processes. In that process, one of the crucial parameters, the mixing efficiency, depends on a large number of geometrical factors, as well as process parameters and complex interactions between the phases which are still not well understood. In the last decade, large progress has been made in optimisation, construction and numerical and experimental analysis of mechanically agitated vessels. In this review, the current state in this field has been presented. It shows that advanced computational fluid dynamic techniques for multiphase flow analysis with reactions and modern experimental techniques can be used with success to analyse in detail mixing features in liquid-liquid, gas-liquid, solid-liquid and in more than two-phase flows. The objective is to show the most important research recently carried out.

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“…the internal vessel geometry or configuration (baffles, coils, vessel bottom type, etc. [3][4][5][6]); -the fluid properties (densities, number of phases, a viscosity [7]);…”

Section: Introductionmentioning

confidence: 99%

A General Review of the Current Development of Mechanically Agitated Vessels

Jaszczur

Młynarczykowska

2020

Processes

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“…Standard agitated vessel mixing performance depends on the geometry of the impeller, the physical properties of the solution and the existence of baffles. Baffles transform much of the tangential flux generated by rotation of the impeller to the more effective axial and radial flow [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Using Baffles on the Rate of Mass Transfer of a Cylindrical Stirred Tank Reactor

Shokry

El-Gayar

El‐Fattah

et al. 2020

MSF

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Owing to the high mixing capacity, the stirred tank reactor is the key class of reactors in the chemical process industry and pharmaceutical industry. The mass transport nature of a batch stirred tank reactor with a fixed copper wall with a cylinder form was studied using copper dissolution in acidified dichromate which is controlled by diffusion. Variables analyzed included the speed of rotation of the impeller, the shape of the impeller and the physical specifications of the solution and the existence of baffles. The data were correlated for the conditions 3667.323 < Re < 34993.18 and 960 < Sc < 1364, for radial flow by the equation: Sh =0.3453 *Sc1/3*Re0.66 but for axial flow by the equation: Sh =0.5866 *Sc1/3*Re0.59. Through speed of rotation of the impeller increases,it allows the rate of mass transfer from the fixed bed to the solution to rise. The radial-flow turbine is more effective than the axial-flow turbine in increasing the rate of mass transfer. The usage of baffles plays a significant role in rising the rate of mass transfer. Using baffles; the correlation will be Sh =0.0769 *Sc1/3*Re0.84 for radial flow and Sh =0.1157 *Sc1/3*Re0.78 for axial flow. The purpose of this research is to estimate the rate of mass transport that can be required in corrosive reactions, and also to maximize the mass transfer rate that can be achieved in other processes, such as electroplating in presence of baffles.

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