Influence of alcohol addition on gas hold-up, liquid circulation velocity and mass transfer coefficient in a split-rectangular airlift bioreactor

Azher, N. El; Gourich, Bouchaib; Vial, Christophe; Bellhaj, M. Soulami; Bouzidi, Abdelhamid; Barkaoui, M.; Ziyad, M.

doi:10.1016/j.bej.2004.12.003

Cited by 40 publications

(50 citation statements)

References 15 publications

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“…Mass transfer is one of the most significant factors in process design and reactor scale up, and has been intensively studied in airlift reactors during the past decades [3][4][5][6][7][8][9]. However, most of these studies have focused on experimental determination of the volumetric mass transfer coefficient (k l a), which is a global parameter that depends on reactor geometry, operating conditions and phase properties [7,[10][11][12][13][14]. The common approach to describe k l a is to correlate it with the factors that affect it.…”

Section: Introductionmentioning

confidence: 99%

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Deng

Wang

Zhang

et al. 2010

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Deng

Wang

Zhang

et al. 2010

Chemical Engineering Journal

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“…This method of enhancement is influenced greatly by particle size and surface characteristics (e.g., hydrophobic or hydrophilic). Although previous researchers using micro-and nanoparticles focused on enhancing oxygen-liquid mass transfer, [13][14][15][16][17][18] this method can be extended to CO-liquid mass-transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…However, the dual Rushton-type scheme also required the most power input, which resulted in the lowest mass-transfer rate per unit power input. Others [13][14][15][16][17][18] have added surfactants, alcohols, salts, and small particles to increase gas-liquid mass-transfer rates. Olle et al 19 synthesized magnetite (Fe 3 O 4 ) nanoparticles coated with oleic acid and a surfactant and achieved a 600% enhancement in the oxygen-liquid mass-transfer rate in an agitated sparged reactor at nanoparticle volume fractions below 1%.…”

Section: Introductionmentioning

confidence: 99%

Enhancing CO−Water Mass Transfer by Functionalized MCM41 Nanoparticles

Zhu

Shanks

Heindel

2008

Ind. Eng. Chem. Res.

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Organic groups are grafted to ∼250-nm-diameter MCM41 nanoparticles with a spherical morphology to enhance the CO-water volumetric mass-transfer coefficient (kLa) for synthesis gas fermentation. The results indicate that (i) ∼250-nm MCM41 nanoparticles show a higher kLa value than large silica particles (1.4 and 7 μm), (ii) surface hydroxyl groups on MCM41 nanoparticles play an important role in mass-transfer enhancement, (iii) organic groups grafted to MCM41 modify the mass-transfer enhancement, and (iv) mercaptan groups grafted to MCM41 show the most mass-transfer enhancement of ∼1.9 times that of no nanoparticle addition. The CO-water mass-transfer enhancement depends on the interaction between the nanoparticles and the CO molecules, which is influenced by the hydrophobicity of the nanoparticles and the functional group on the nanoparticles. Organic groups are grafted to ∼250-nm-diameter MCM41 nanoparticles with a spherical morphology to enhance the CO-water volumetric mass-transfer coefficient (k L a) for synthesis gas fermentation. The results indicate that (i) ∼250-nm MCM41 nanoparticles show a higher k L a value than large silica particles (1.4 and 7 µm), (ii) surface hydroxyl groups on MCM41 nanoparticles play an important role in mass-transfer enhancement, (iii) organic groups grafted to MCM41 modify the mass-transfer enhancement, and (iv) mercaptan groups grafted to MCM41 show the most mass-transfer enhancement of ∼1.9 times that of no nanoparticle addition. The CO-water mass-transfer enhancement depends on the interaction between the nanoparticles and the CO molecules, which is influenced by the hydrophobicity of the nanoparticles and the functional group on the nanoparticles.

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“…The main cause for this is the coalescence-inhibiting nature of the alcohol. The decreasing surface tension in the presence of alcohol results in a smaller average size of the bubbles and, consequently, lower bubble rise velocities [9]. Freitas and Teixeira [10] and Miyahara and Nagatani [5] found that the only property of alcohol solutions that differed considerably from water was their surface tension.…”

Section: Introductionmentioning

confidence: 97%

Influence of the Sparger Type and Added Alcohol on the Gas Holdup of an External‐Loop Airlift Reactor

et al. 2015

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The influences of alcohol adding and three different gas spargers (single orifice, perforated plate, and sinter plate) on the gas holdup in an external-loop airlift reactor were studied. The experimental results show that the gas holdup can be increased by mutual influence of both the alcohol adding and the sparger type. The presence of small amounts of normal aliphatic alcohols caused an increase of the gas holdup compared to the air-water system, due to their coalescence-inhibiting nature. The sinter plate was the most efficient sparger, followed by the perforated plate and the single orifice. A proposed artificial neural network (ANN) has the potential to predict gas holdup values in airlift reactors for various alcohols and types of gas spargers.

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Influence of alcohol addition on gas hold-up, liquid circulation velocity and mass transfer coefficient in a split-rectangular airlift bioreactor

Cited by 40 publications

References 15 publications

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Gas holdup, bubble behavior and mass transfer in a 5m high internal-loop airlift reactor with non-Newtonian fluid

Enhancing CO−Water Mass Transfer by Functionalized MCM41 Nanoparticles

Influence of the Sparger Type and Added Alcohol on the Gas Holdup of an External‐Loop Airlift Reactor

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