Gas-liquid mass transfer in a new three-phase stirred airlift reactor

Bang, W.; Nikov, Iordan; Delmas, Hami; Bascoul, A.

doi:10.1002/(sici)1097-4660(199806)72:2<137::aid-jctb887>3.0.co;2-e

Cited by 19 publications

(6 citation statements)

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“…(15) and (16) [31]. The reasons for this disparity are apparently linked with important differences between the reactor used by us and that used by Bang et al [21]. The latter authors employed an exceptionally small vessel (∼10 l) that was sparged in the draft-tube; the A r /A d ratio was only 0.69 compared to our value of 1.27; and a marine impeller pumping upward was used in the draft-tube compared to our downward pumping hydrofoil impellers.…”

Section: Gas-liquid Mass Transfermentioning

confidence: 79%

“…The only other correlations reported for k L a L in mechanically stirred airlift reactors are those of Bang et al [21]; for the air-water system, they obtained the equation:…”

Section: Gas-liquid Mass Transfermentioning

confidence: 98%

“…Prochem hydrofoils have been evaluated for use in bioreactors in the past, but mostly only in the conventional baffled stirred tank configuration [16][17][18][19][20]. A few studies have been reported in reactors with axial flow marine propellers inside draft-tubes, but only in relatively small (≤250 l) vessels [6,11,21,22].…”

Section: Introductionmentioning

confidence: 99%

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Oxygen transfer and mixing in mechanically agitated airlift bioreactors

Chisti

Jäuregui‐Haza²

2002

Biochemical Engineering Journal

152

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Gas holdup, mixing, liquid circulation and gas-liquid oxygen transfer were characterized in a large (∼1.5 m 3 ) draft-tube airlift bioreactor agitated with Prochem ® hydrofoil impellers placed in the draft-tube. Measurements were made in water and in cellulose fiber slurries that resembled broths of mycelial microfungi. Use of mechanical agitation generally enhanced mixing performance and the oxygen transfer capability relative to when mechanical agitation was not used; however, the oxygen transfer efficiency was reduced by mechanical agitation. The overall volumetric gas-liquid mass transfer coefficient declined with the increasing concentration of the cellulose fiber solids; however, the mixing time in these strongly shear thinning slurries was independent of the solids contents (0-4% w/v). Surface aeration never contributed more than 12% to the total mass transfer in air-water.

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Section: Gas-liquid Mass Transfermentioning

confidence: 79%

“…The only other correlations reported for k L a L in mechanically stirred airlift reactors are those of Bang et al [21]; for the air-water system, they obtained the equation:…”

Section: Gas-liquid Mass Transfermentioning

confidence: 98%

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Oxygen transfer and mixing in mechanically agitated airlift bioreactors

Chisti

Jäuregui‐Haza²

2002

Biochemical Engineering Journal

152

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“…Mechanically stirred airlift bioreactors are a viable alternative, for presenting some characteristics from both the traditional airlift reactors, and the aerated mechanically stirred tanks. Mechanically stirred hybrid airlift bioreactors have been described in the literature [3], [6], [7], with the objective of improving the process, by increasing the mass transfer from the gas to the liquid phases. Bang et al, [6] proposed a new type of mechanically stirred airlift reactor, in which the agitator is located at the bottom of the reaction vessel, centered on the riser.…”

Section: Introductionmentioning

confidence: 99%

“…Mechanically stirred hybrid airlift bioreactors have been described in the literature [3], [6], [7], with the objective of improving the process, by increasing the mass transfer from the gas to the liquid phases. Bang et al, [6] proposed a new type of mechanically stirred airlift reactor, in which the agitator is located at the bottom of the reaction vessel, centered on the riser. According to these authors, the volumetric coefficient mass transfer increased up to four times, compared to a standard airlift reactor; this increase is due primarily to the bubbles collapse caused by the impeller, which also is directly related to the increase of the gas holdup.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic and Mass Transfer Study in a Mechanically Stirred Hybrid Airlift Bioreactor Based on Impeller Type

Jesus¹,

Santana²,

Filho³

2014

IJCEA

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Abstract-The analysis of the influence by the impeller type in a stirred hybrid airlift bioreactor was performed in relation to the gas holdup, and mass transfer. The comparative study was performed using three-bladed marine and Lightnin A310 (axial flow impellers), and six-bladed Rusthon turbine and six-bladed Smith turbine (radial flow impellers). The experiments were conducted using distilled water at 25 0 C and a constant rotation velocity of 800 rpm, as well as in the absence of agitation (airlift mode); the superficial gas velocity varied from 0.0157 to 0.0262 ms -1 . The gas holdup and oxygen transfer coefficient was higher with the use of radial impellers; however, the mechanical power input required while using radial impellers is 730-1400% higher than with axial impellers.Index Terms-Axial Impeller, hydrodynamics, mass transfer, radial impeller, stirred airlift bioreactor.

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Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

et al. 2015

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The influence of impeller type in a mechanically stirred airlift bioreactor was analyzed in relation to the non‐Newtonian viscous fluids. The agitation was carried out through a marine impeller (axial impeller) and a paddle impeller (radial impeller) located along with the gas sparger in the region comprised by the riser. The bioreactor was sparged with air under different velocities (0.036–0.060 m s−1). Carboxymethylcellulose 1.94% and xanthan 1.80% were used as a fluid model. The gas holdup and volumetric mass‐transfer coefficient increased in up to five and three times, respectively, when compared to a conventional airlift bioreactor; however, better results were obtained when the straight paddle impeller type was used. The results suggest that the studied bioreactor can be used successfully in viscous fluid, and it can be more efficient than conventional airlift bioreactors. The results obtained suggest the use of radial impellers. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3159–3171, 2015

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Gas-liquid mass transfer in a new three-phase stirred airlift reactor

Cited by 19 publications

References 0 publications

Oxygen transfer and mixing in mechanically agitated airlift bioreactors

Oxygen transfer and mixing in mechanically agitated airlift bioreactors

Hydrodynamic and Mass Transfer Study in a Mechanically Stirred Hybrid Airlift Bioreactor Based on Impeller Type

Influence of impeller type on hydrodynamics and gas‐liquid mass‐transfer in stirred airlift bioreactor

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