Carbon Monoxide Mass Transfer for Syngas Fermentation in a Stirred Tank Reactor with Dual Impeller Configurations

2008 ◽  
Vol 23 (3) ◽  
pp. 613-620 ◽  
Author(s):  
Andrew J. Ungerman ◽  
Theodore J. Heindel
Keyword(s):  
Mass Transfer ◽  
Carbon Monoxide ◽  
Stirred Tank ◽  
Syngas Fermentation ◽  
Stirred Tank Reactor ◽  
Tank Reactor

scholarly journals Investigation and Modeling of Gas-Liquid Mass Transfer in a Sparged and Non-Sparged Continuous Stirred Tank Reactor with Potential Application in Syngas Fermentation

Fermentation ◽  
2019 ◽  
Vol 5 (3) ◽  
pp. 75 ◽  
Author(s):  
Kan Liu ◽  
John R. Phillips ◽  
Xiao Sun ◽  
Sayeed Mohammad ◽  
Raymond L. Huhnke ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Operating Conditions ◽  
Stirred Tank ◽  
Continuous Stirred Tank Reactor ◽  
Syngas Fermentation ◽  
Mass Transfer Limitation ◽  
Stirred Tank Reactor ◽  
Tank Reactor ◽  
Working Volume ◽  
Continuous Stirred Tank

Syngas (mixture of CO, H2 and CO2) fermentation suffers from mass transfer limitation due to low solubility of CO and H2 in the liquid medium. Therefore, it is critical to characterize the mass transfer in syngas fermentation reactors to guide in delivery of syngas to the microorganisms. The objective of this study is to measure and predict the overall volumetric mass transfer coefficient, kLa for O2 at various operating conditions in a 7-L sparged and non-sparged continuous stirred-tank reactor (CSTR). Measurements indicated that the kLa for O2 increased with an increase in air flow rate and agitation speed. However, kLa for O2 decreased with the increase in the headspace pressure. The highest kLa for O2 with air sparged in the CSTR was 116 h−1 at 600 sccm, 900 rpm, 101 kPa, and 3 L working volume. Backmixing of the headspace N2 in the sparged CSTR reduced the observed kLa. The mass transfer model predicted the kLa for O2 within 10% of the experimental values. The model was extended to predict the kLa for syngas components CO, CO2 and H2, which will guide in selecting operating conditions that minimize power input to the bioreactor and maximize the syngas conversion efficiency.

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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