Mass Transfer in an Airlift Reactor with a Net Draft Tube

Wu, Wen Teng; Wu, Jiumn Yih; Jong, Jian Zhong

doi:10.1021/bp00017a015

Cited by 21 publications

(10 citation statements)

References 14 publications

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“…Using the gas phase stationary method (method 3) or the liquid phase dynamic method (method 1), k L a was found to a was found to a increase with the aeration according to the following relation: Wu et al (1992), who studied mass transfer phenomena in an ALR with a net draft tube, proposed: …”

Section: Volumetric Mass Transfer Coeffi Cient K L a Global Studymentioning

confidence: 99%

Oxygen Transfer in a Baffled Rectangular Air‐Lift Loop Reactor

et al. 2004

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The objective of this study is to characterize mass transfer in a rectangular air‐lift loop reactor in two‐phase flow. In a previous work, it has been shown that the reactor presents a complex gas flow pattern. Therefore, first, the global mass transfer volumetric coefficient kLa was measured in two‐phase flow, by three methods (two based on the liquid phase mass balance, one based on the gas phase mass balance). Then, second, a localized analysis was implemented in order to obtain more information about the phenomena governing the gas phase flow.

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Section: Volumetric Mass Transfer Coeffi Cient K L a Global Studymentioning

confidence: 99%

Oxygen Transfer in a Baffled Rectangular Air‐Lift Loop Reactor

et al. 2004

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“…It was found that, as long as the gas velocity exceeded 2 cm s −1 , K L a of the proposed reactor would always be higher than that of the original bubble column or air-lift reactor. 43,44 At a superficial gas velocity of 5.02 cm s −1 , the K L a value of the proposed reactor with mesh draft tube was double than that of the air-lift reactor. The value of the volumetric mass transfer coefficient, K L a, increased as diameter ratio of the riser and downcomer decreased at higher air flow rates.…”

Section: Effect Of the Type Of Reactor On Productionmentioning

confidence: 92%

Improvements in the production of bacterial synthesized biocellulose nanofibres using different culture methods

Sani

Dahman

2009

J of Chemical Tech & Biotech

114

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This review summarizes previous work that was done to improve the production of bacterial cellulose nanofibres. Production of biocellulose nanofibres is a subject of interest owing to the wide range of unique properties that makes this product an attractive material for many applications. Bacterial cellulose is a natural nanomaterial that has a native dimension of less than 50 nm in diameter. It is produced in the form of nanofibres, yielding a very pure cellulose product with unique physical properties that distinguish it from plant-derived cellulose. Its high surface-to-volume ratio combined with its unique properties such as poly-functionality, hydrophilicity and biocompatibility makes it a potential material for applications in the biomedical field. The purpose of this review is to summarize the methods that might help in delivering microbial cellulose to the market at a competitive cost. Different feedstocks in addition to different bioreactor systems that have been previously used are reviewed. The main challenge that exists is the low yield of the cellulosic nanofibres, which can be produced in static and agitated cultures. The static culture method has been used for many years. However, the production cost of this nanomaterial in bioreactor systems is less expensive than the static culture method. Biosynthesis in bioreactors will also be less labour intensive when scaled up. This would improve developing intermediate fermentation scale-up so that the conversion to an efficient large-scale fermentation technology will be an easy task.

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“…It therefore makes sense to try to bring into the ALR some of the characteristics of BCs in a controlled fashion. This was done by several authors (368)(369)(370)(371)(372)(373)(374)(375), who tested different perforated draft tubes in a DT-ALR. The perforations in the draft tube facilitated communication between the less-well aerated liquid in the downcomer and the better aerated riser.…”

Section: Alrs Using Mechanically Moved Internalsmentioning

confidence: 99%

Bioreactors: Airlift Reactors

Merchuk

Camacho

2010

Encyclopedia of Industrial Biotechnology

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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.

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Mass Transfer in an Airlift Reactor with a Net Draft Tube

Cited by 21 publications

References 14 publications

Oxygen Transfer in a Baffled Rectangular Air‐Lift Loop Reactor

Oxygen Transfer in a Baffled Rectangular Air‐Lift Loop Reactor

Improvements in the production of bacterial synthesized biocellulose nanofibres using different culture methods

Bioreactors: Airlift Reactors

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