Mass transfer characteristics of a novel three-phase airlift contactor with a semipermeable membrane

Jajuee, Babak; Margaritis, Argyrios; Karamanev, Dimitre; Bergougnou, M.A.

doi:10.1016/j.cej.2006.08.020

Cited by 15 publications

(9 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dynamic gassing out technique (229) is a very simple and ingenious method for studying bubble dispersions (8,(230)(231)(232)(233)(234)(235)(236)(237)(238)(239). Variations of the dynamic method have been proposed to minimize disturbances in the system, by introduction of step variations of agitation or pressure (227,240).…”

Section: Mass Transfer Rate Measurementmentioning

confidence: 99%

See 1 more Smart Citation

Bioreactors: Airlift Reactors

Merchuk

Camacho

2010

Encyclopedia of Industrial Biotechnology

View full text Add to dashboard Cite

ALRs are popular in modern bioprocess research and development and, in many cases, they have found industrial uses. The distinctive characteristics of ALRs are conferred by the fluid dynamics of the liquid‐gas or liquid gas‐solid mixtures: holdup, liquid velocity, and mixing in the riser, gas separator, and downcomer. Only a correct understanding of the interconnection of these regions can make possible the scale‐up of a laboratory device, to pilot or industrial size. Several correlations are available in the literature for the prediction of the fluid dynamic characteristics of the reactor and of the mass and heat transfer coefficients, and a selection is presented in this review. Significant progress has been made in the application of modern computational tools to the simulation and design of ALRs. In parallel, innovative and sophisticated methods have been applied to obtain a deeper insight into the mechanisms of fluid motion and the flow patterns in the reactor. However, no single research group has managed to cover all the variables over a wide range. The engineer confronting scale‐up or de novo design of an ALR must analyze the validity of the correlations and computation methods used for the calculations.

show abstract

Section: Mass Transfer Rate Measurementmentioning

confidence: 99%

“…Split Baffle. Jajuee et al (231) conceived a three-phase ALR in which a semipermeable membrane was used as split baffle between riser and downcomer (Fig. 50).…”

Section: Alrs Using Mechanically Moved Internalsmentioning

confidence: 99%

Bioreactors: Airlift Reactors

Merchuk

Camacho

2010

Encyclopedia of Industrial Biotechnology

View full text Add to dashboard Cite

show abstract

“…Effectiveness of these bubble columns on a large scale as airlift reactors has been proven in numerous applications. For instance, animal cell cultures, aerobic microbial fermentations, flue gas desulfurization, water and wastewater treatment, coal liquefaction, chemical synthesis, and petroleum refining may be mentioned (Jajuee et al, 2006;Sun et al, 2006;Zhang et al, 2005). Bubble column reactors have attracted considerable research attention due to their advantages, including simple construction without any internal moving parts, ease of adding and removing catalyst, excellent heat and mass transfer capacity (especially for exothermic reactions), and satisfactory mixing properties with low power requirements (Lin et al, 2004;Papari et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Dme Direct Synthesis From Syngas in a Large-Scale Three-Phase Slurry Bubble Column Reactor: Transient Modeling

Papari

Kazemeini

Fattahi

et al. 2014

Chemical Engineering Communications

View full text Add to dashboard Cite

In this research, a new transient mathematical model based upon tanks-in-series configuration was developed to simulate the direct synthesis of dimethyl ether (DME) from syngas in a commercial-scale slurry bubble column reactor. A comparison between the simulation results and experimental data showed that the applied model might acceptably describe the behavior of the slurry reactor. Furthermore, simulation results in the heterogeneous bubble flow regime indicated that the proposed model with 10 tanks-in-series provided the optimum condition. Utilizing this transient model and considering catalyst deactivation, the effect of operating conditions on DME productivity and CO conversion were investigated. In addition, the dynamic behavior of the reactor was studied after implementing a step change in the reactor's coolant fluid temperature.

show abstract

“…Industrial applications of these bioreactors are in hydrogenation, oxidation, epoxidation, fermentation, production of single cell protein, cultivation of microorganisms and wastewater treatment in chemical and biochemical processes [1][2][3][4][5][6]. Airlift bioreactors have attracted considerable attention due to their simple mechanical design with no moving part, high capacity, good mixing, low cost, low shear stress and low power input [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Mixing parameters for an airlift bioreactor considering constant cross sectional area of riser to downcomer: Effect of sparging gas location

Behin

Ahmadi

2010

Korean J. Chem. Eng.

View full text Add to dashboard Cite

The effect of mode of sparging gas on the mixing parameters of an internal loop airlift bioreactor was investigated. Two bioreactors of identical volume of 14×10 3 cm 3 and the optimum riser to downcomer cross sectional area ratio of 0.6 were studied. In one bioreactor a gas sparger was located in the draft tube and in the annulus in another. Liquid mixing characteristics, i.e., mixing time and circulation time, were employed to describe the performance of the bioreactors. The tracer injection method was used to determine the mixing parameters. A mathematical modeling based on the tanks-in-series model was employed to characterize the hydrodynamics behavior of the bioreactors. Matlab 7.1 software was used to solve the model equations in the Laplace domain and determine the model parameter, the number of stages. A comparison between the simulation results and experimental data showed that the applied model can accurately describe the behavior of the bioreactors. The results showed that when the gas sparger was located in the draft tube, the liquid mixing time, circulation time, and the number of stage were less than while the gas sparger was located in annulus. This is due to more wall effects, more energy losses and pressure drop in the case of gas injection in the annulus.

show abstract

Mass transfer characteristics of a novel three-phase airlift contactor with a semipermeable membrane

Cited by 15 publications

References 18 publications

Bioreactors: Airlift Reactors

Bioreactors: Airlift Reactors

Dme Direct Synthesis From Syngas in a Large-Scale Three-Phase Slurry Bubble Column Reactor: Transient Modeling

Mixing parameters for an airlift bioreactor considering constant cross sectional area of riser to downcomer: Effect of sparging gas location

Contact Info

Product

Resources

About