Liquid circulation and mixing characteristics of airlift contactors

Bello, R. Ade; Robinson, Campbell W.; Moo‐Young, Murray

doi:10.1002/cjce.5450620501

Cited by 161 publications

(102 citation statements)

References 6 publications

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“…[1][2][3][4][5][6][7][8][9][10][11] The total pressure drop in the riser corresponds to the hydrostatic head and is related to riser gas holdup. The riser gas holdup measurement was verified by use of the bed expansion method to ensure its accuracy.…”

Section: Methodsmentioning

confidence: 99%

“…12 The use of two identical probes eliminates the need to consider the response time of the electrodes. 1,5,[13][14][15][16] The potassium chloride salt solution used as a tracer to determine the superficial liquid velocity has been shown in previous bubble column studies to significantly affect bubble coalescence and gas holdup, particularly in the transition region from homogeneous to heterogeneous flow. 13 Jamialahmadi and Muller-Steinhagen 17 and Zahradnik et al 18 evaluated the effect of salt on reactor hydrodynamics using salt concentrations that ranged from 0.005 to 0.15 g/cm 3 and reported that reactor hydrodynamics were not affected for the lowest concentrations.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] When EALRs are used as biological fermentors, gas holdup and liquid velocity in the riser and downcomer become key hydrodynamic factors that determine if there will be dead zones in the reactor. If the liquid velocity is too slow, dead zones may result and biological growth will cease, reducing the overall reactor productivity.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] Most of these previous works have focused on airlift reactors with a downcomer-to-riser area ratio greater than 1:9. As the downcomer-to-riser area ratio decreases, there exists a point when some of the EALR hydrodynamics, such as riser gas holdup, may more closely resemble the hydrodynamics observed in bubble column reactors.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic Considerations in an External Loop Airlift Reactor with a Modified Downcomer

Jones

Heindel

2010

Ind. Eng. Chem. Res.

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Gas holdup and superficial liquid velocity in the downcomer and riser are studied for an external loop airlift reactor with a downcomer-to-riser area ratio of 1:16. Two downcomer configurations are investigated over a range of superficial gas velocities (0.5 ≤ UG ≤ 20 cm/s) using three aeration plate open area ratios (A = 0.62, 0.99, and 2.22%). These results are compared to a bubble column operated with similar operating conditions. Gas holdup in both the riser and downcomer are found to increase with increasing superficial gas velocity. Results show that riser gas holdup varies slightly with downcomer configuration, while a considerable variation is observed for downcomer gas holdup. The superficial liquid velocity varies considerably for the two downcomer configurations and is a function of superficial gas velocity and flow conditions in the downcomer. Observed variations are independent of aeration plate open area ratio. Gas holdup and superficial liquid velocity in the downcomer and riser are studied for an external loop airlift reactor with a downcomer-to-riser area ratio of 1:16. Two downcomer configurations are investigated over a range of superficial gas velocities (0.5 e U G e 20 cm/s) using three aeration plate open area ratios (A ) 0.62, 0.99, and 2.22%). These results are compared to a bubble column operated with similar operating conditions. Gas holdup in both the riser and downcomer are found to increase with increasing superficial gas velocity. Results show that riser gas holdup varies slightly with downcomer configuration, while a considerable variation is observed for downcomer gas holdup. The superficial liquid velocity varies considerably for the two downcomer configurations and is a function of superficial gas velocity and flow conditions in the downcomer. Observed variations are independent of aeration plate open area ratio.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic Considerations in an External Loop Airlift Reactor with a Modified Downcomer

Jones

Heindel

2010

Ind. Eng. Chem. Res.

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“…For any input operational conditions maximal productivity of the reactor is only guaranteed in the point of the target GLR optimal geometry. The GLR model proposed employs tanks-in-series mixing model sketched in Figure 6 to combine hydrodynamics of a real GLR (Bello, et al (1984), Blažej, et al (2004, Sikula, et al (2007), , Sikula & Markoš (2008) ) and the kinetics of the model reaction from Section 1.1. This GLR model is much simpler and a bit more realistic than that of Kluytmans, et al (2003) who employed axial dispersion mixing model with hydrodynamics measured in small-scale 2D bubblecolumn reactor and considered intra-particle diffusion.…”

Section: Natural Periodic Operation Of Glrmentioning

confidence: 99%

Optimal Design of a Multifunctional Reactor for Catalytic Oxidation of Glucose with Fast Catalyst Deactivation

Gogová¹

2010

Dynamic Modelling

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High liquid holdup airlift tower loop reactor: I. Riser hydrodynamic characteristics

García

Lavín

Dı́az

2000

J. Chem. Technol. Biotechnol.

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The hydrodynamics of high liquid holdup airlift reactors have not been widely studied. In this work we study the riser of a reactor of this type, focussing on the in¯uence of the gas¯ow rate and the submergence ratio on various hydrodynamic parameters: liquid circulation velocity, gas holdup, and gas residence time in the liquid. A notable difference in reactor behavior is observed with a submergence ratio equal to unity and with a ratio lower than unity. Correlations for the parameters studied in different conditions, as several submergence ratios, are proposed, these are extrapolations of other equations proposed in the literature for airlift reactors. The reactor studied in this work can be thought of as an element of a great pool formed by multiple elements of similar¯ux type. The studied parameters are shown to be very important for subsequent hydrodynamic and mass transfer modeling of the reactor.

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Liquid circulation and mixing characteristics of airlift contactors

Cited by 161 publications

References 6 publications

Hydrodynamic Considerations in an External Loop Airlift Reactor with a Modified Downcomer

Hydrodynamic Considerations in an External Loop Airlift Reactor with a Modified Downcomer

Optimal Design of a Multifunctional Reactor for Catalytic Oxidation of Glucose with Fast Catalyst Deactivation

High liquid holdup airlift tower loop reactor: I. Riser hydrodynamic characteristics

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