Influence of top-section design and draft-tube height on the performance of airlift bioreactors containing water-in-oil microemulsion
The mixing and mass transfer characteristics of draft‐tube airlift bioreactors (DTAB) for a water‐in‐kerosene microemulsion, as a cold model of petroleum biodesulfurization, were studied. Incomplete gas disengagement at the top‐section of the DTAB and hence high gas recirculation were obtained with...
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| Veröffentlicht in: | Journal of chemical technology and biotechnology (1986) 2004-03, Vol.79 (3), p.260-267 |
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| container_title | Journal of chemical technology and biotechnology (1986) |
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| creator | Mehrnia, Mohammad Reza Towfighi, Jafar Bonakdarpour, Babak Akbarnegad, Mohammad Mehdi |
| description | The mixing and mass transfer characteristics of draft‐tube airlift bioreactors (DTAB) for a water‐in‐kerosene microemulsion, as a cold model of petroleum biodesulfurization, were studied. Incomplete gas disengagement at the top‐section of the DTAB and hence high gas recirculation were obtained with the microemulsion system for all the top‐section configurations employed in the present study especially at the high airflow rates. The ratio (S) of the volumes of the riser and the downcomer to the top‐section together with the gas disengagement abilities of the gas separator were both found to affect the mixing performance of the DTAB employed for the microemulsion system. Increase in the draft‐tube height resulted in significant increase in the mixing time (tm) and a slight increase in the overall volumetric oxygen transfer coefficient (kLa). Increase in the diameter of the top‐section and the height of the liquid above the draft‐tube led to a decrease in kLa, the latter effect being less prominent. New correlations were developed that predicted the mixing time and oxygen transfer coefficients obtained in the present work with reasonable accuracy. Copyright © 2004 Society of Chemical Industry |
| doi_str_mv | 10.1002/jctb.971 |
| format | Article |
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Incomplete gas disengagement at the top‐section of the DTAB and hence high gas recirculation were obtained with the microemulsion system for all the top‐section configurations employed in the present study especially at the high airflow rates. The ratio (S) of the volumes of the riser and the downcomer to the top‐section together with the gas disengagement abilities of the gas separator were both found to affect the mixing performance of the DTAB employed for the microemulsion system. Increase in the draft‐tube height resulted in significant increase in the mixing time (tm) and a slight increase in the overall volumetric oxygen transfer coefficient (kLa). Increase in the diameter of the top‐section and the height of the liquid above the draft‐tube led to a decrease in kLa, the latter effect being less prominent. New correlations were developed that predicted the mixing time and oxygen transfer coefficients obtained in the present work with reasonable accuracy. 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Chem. Technol. Biotechnol</addtitle><description>The mixing and mass transfer characteristics of draft‐tube airlift bioreactors (DTAB) for a water‐in‐kerosene microemulsion, as a cold model of petroleum biodesulfurization, were studied. Incomplete gas disengagement at the top‐section of the DTAB and hence high gas recirculation were obtained with the microemulsion system for all the top‐section configurations employed in the present study especially at the high airflow rates. The ratio (S) of the volumes of the riser and the downcomer to the top‐section together with the gas disengagement abilities of the gas separator were both found to affect the mixing performance of the DTAB employed for the microemulsion system. Increase in the draft‐tube height resulted in significant increase in the mixing time (tm) and a slight increase in the overall volumetric oxygen transfer coefficient (kLa). Increase in the diameter of the top‐section and the height of the liquid above the draft‐tube led to a decrease in kLa, the latter effect being less prominent. New correlations were developed that predicted the mixing time and oxygen transfer coefficients obtained in the present work with reasonable accuracy. Copyright © 2004 Society of Chemical Industry</description><subject>airlift bioreactor</subject><subject>Applied sciences</subject><subject>Biological and medical sciences</subject><subject>Biotechnology</subject><subject>Chemical engineering</subject><subject>Emulsions</subject><subject>Exact sciences and technology</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>gas-liquid separator</subject><subject>hydrodynamics</subject><subject>Mass transfer</subject><subject>Methods. Procedures. 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| ispartof | Journal of chemical technology and biotechnology (1986), 2004-03, Vol.79 (3), p.260-267 |
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| subjects | airlift bioreactor Applied sciences Biological and medical sciences Biotechnology Chemical engineering Emulsions Exact sciences and technology Fundamental and applied biological sciences. Psychology gas-liquid separator hydrodynamics Mass transfer Methods. Procedures. Technologies microemulsion Others Petroleum Q1 Reactors Various methods and equipments |
| title | Influence of top-section design and draft-tube height on the performance of airlift bioreactors containing water-in-oil microemulsion |
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