Liquid-Solid Mass Transfer Behavior of a Stirred-Tank Reactor with a Fixed Bed at Its Bottom

2014 ◽  
Vol 37 (9) ◽  
pp. 1525-1531 ◽  
Author(s):  
Mohamed A. El-Naggar ◽  
Mohamed H. Abdel-Aziz ◽  
Ahmed A. Zatout ◽  
Gomaa H. Sedahmed
Keyword(s):  
Mass Transfer ◽  
Fixed Bed ◽  
Stirred Tank ◽  
Solid Mass ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Transfer Behavior

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

2020 ◽  
Vol 1008 ◽  
pp. 168-176
Author(s):  
Fathy Shokry ◽  
Dina Ahmed El-Gayar ◽  
Marwa Abd El-Fattah ◽  
H.A. Farag ◽  
Gomaa H. Sedahmed
Keyword(s):  
Mass Transfer ◽  
Mass Transport ◽  
Radial Flow ◽  
Mass Transfer Rate ◽  
Fixed Bed ◽  
Axial Flow ◽  
Stirred Tank ◽  
Stirred Tank Reactor ◽  
Chemical Process Industry ◽  
Tank Reactor

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.

scholarly journals Circulating Jet for Enhancing the Mass Transfer in a Gas-liquid Stirred Tank Reactor

2021 ◽  
Author(s):  
Lei Wang ◽  
Xiao Xu ◽  
Hualin Wang ◽  
HongLai Liu ◽  
Qiang Yang
Keyword(s):  
Mass Transfer ◽  
Scale Up ◽  
Input Power ◽  
Stirred Tank ◽  
Exhaust Gas ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Mass Transfer Efficiency ◽  
Low Mass ◽  
Liquid Mass Transfer

A gas-liquid stirred tank reactor (STR) has some problems, such as low mass transfer efficiency, high exhaust gas oxygen concentration, and low product conversion rate, due to limitations of stirring speed and input power. This article proposes a method to enhance the gas-liquid mass transfer in a STR using circulating jet internals. When a circulating jet is added, the average bubble size in the reactor is reduced to 1.26 mm, and the overall gas holdup is increased to 8.23%, which is an increase of 3.62 times of the original STR. The gas-liquid volumetric mass transfer coefficient is increased to 0.05556 s-1, which is 4.84 times of the original STR. The unit volume power is increased by only 1.4 times. These data provide references for the design and scale-up of new jet STRs.

Mass transfer at the outer surface of a spiral tube heat exchanger in a stirred tank reactor and possible applications

2021 ◽  
Vol 165 ◽  
pp. 426-434
Author(s):  
Samah Mustafa ◽  
Mahmoud M. Taha ◽  
Ahmed A. Zatout ◽  
Gomaa H. Sedahmed ◽  
Dina A. El-Gayar
Keyword(s):  
Mass Transfer ◽  
Heat Exchanger ◽  
Outer Surface ◽  
Stirred Tank ◽  
Spiral Tube ◽  
Stirred Tank Reactor ◽  
Tube Heat Exchanger ◽  
Tank Reactor
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