Model description of dibenzothiophene mass transfer in oil/water dispersions with respect to biodesulfurization

Marcelis, C.L.M.; Leeuwen, M. van; Polderman, H.G.; Janssen, A.J.H.; Lettinga, G.

doi:10.1016/s1369-703x(03)00041-x

Cited by 23 publications

(12 citation statements)

References 30 publications

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“…These results agree with the model of transfer described by Marcelis et al [28] for dibenzothiophene mass transfer in oil/water dispersion, where density and interfacial tension were found to be of minor importance. The results obtained have highlighted the interest of two-phase partitioning bioreactor in the context of biological off-gas treatment.…”

Section: Discussionsupporting

confidence: 91%

Study on Mass Transfer of Isopropylbenzene and Oxygen in a Two-Phase Partitioning Bioreactor in the Presence of Silicone Oil

Aldric

Lecomte²,

Thonart

2009

Appl Biochem Biotechnol

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A two-phase partitioning bioreactor to treat gas effluents polluted by volatile organic compound has been developed. In this work, both the mass transfer of isopropylbenzene (IPB) and oxygen have been considered in relation to their influence on the hydrodynamics of the reactor and the type of silicone oils used as a second phase. The synergistic effect of silicone oil and stirrer speed on the global oxygen mass transfer coefficient (KLa) and gas holdup (up to 12%) have been investigated. The addition of 10% of low viscosity silicone oil (10 cSt) in the reactor does not significantly affect the oxygen transfer rate. The very high solubility of IPB in the silicone oil leads to an enhancement of driving force term, especially for high fraction of silicone oil. However, it does not seem useful to exceed a volume fraction of 10% since KLa(IPB) decreases sharply at higher proportions of silicone oil. KLa(IPB) and KLaO2 evolve in the same way with the proportion of silicone oil. These results confirm the potentialities of our bioreactor to improve both the oxygen and pollutant gas transfer in the field of the treatment of gaseous pollutants, even for highly concentrated effluents.

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Section: Discussionsupporting

confidence: 91%

Study on Mass Transfer of Isopropylbenzene and Oxygen in a Two-Phase Partitioning Bioreactor in the Presence of Silicone Oil

Aldric

Lecomte²,

Thonart

2009

Appl Biochem Biotechnol

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“…The main mass transfer resistance is in the aqueous phase, influencing DBT transport from the oil-water interface to the bacterium (Marcelis et al, 2003). The hydrophobic nature of several desulfurizing bacteria, e.g.…”

Section: Phase Contact and Separationmentioning

confidence: 99%

Biocatalytic desulfurization (BDS) of petrodiesel fuels

2008

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Oil refineries are facing many challenges, including heavier crude oils, increased fuel quality standards, and a need to reduce air pollution emissions. Global society is stepping on the road to zero-sulfur fuel, with only differences in the starting point of sulfur level and rate reduction of sulfur content between different countries. Hydrodesulfurization (HDS) is the most common technology used by refineries to remove sulfur from intermediate streams. However, HDS has several disadvantages, in that it is energy intensive, costly to install and to operate, and does not work well on refractory organosulfur compounds. Recent research has therefore focused on improving HDS catalysts and processes and also on the development of alternative technologies. Among the new technologies one possible approach is biocatalytic desulfurization (BDS). The advantage of BDS is that it can be operated in conditions that require less energy and hydrogen. BDS operates at ambient temperature and pressure with high selectivity, resulting in decreased energy costs, low emission, and no generation of undesirable side products. Over the last two decades several research groups have attempted to isolate bacteria capable of efficient desulfurization of oil fractions. This review examines the developments in our knowledge of the application of bacteria in BDS processes, assesses the technical viability of this technology and examines its future challenges. IntroductionBiotechnology is now accepted as an attractive means of improving the efficiency of many industrial processes, and resolving serious environmental problems. One of the reasons for this is the extraordinary metabolic capability that exists within the bacterial world. Microbial enzymes are capable of biotransforming a wide range of compounds, and the worldwide increase in attention being paid to this concept can be attributed to several factors, including the presence of a wide variety of catabolic enzymes and the ability of many microbial enzymes to transform a broad range of unnatural compounds (xenobiotics) as well as natural compounds. Biotransformation processes have several advantages compared with chemical processes, including: (i) microbial enzyme reactions are often more selective; (ii) biotransformation processes are often more energy-efficient; (iii) microbial enzymes are active under mild conditions; and (iv) microbial enzymes are environment-friendly biocatalysts. Although many biotransformation processes have been described, only a few of these have been used as part of an industrial process. Many opportunities remain in this area.Petroleum biotechnology is based on biotransformation processes. Petroleum microbiology research is advancing on many fronts, spurred on most recently by new knowledge of cellular structure and function gained through molecular and protein engineering techniques, combined with more conventional microbial methods. Current applied research on petroleum microbiology encompasses oil spill remediation, fermenter-and wetland-based hydrocarbon...

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“…Unlike the above parameters, it was found that the mass transfer coefficient (K L ) of toluene between the aqueous and organic phases in the foam is not a sensitive parameter (results not shown). This came as a surprise as other studies in biphasic reactors had shown that interphase mass transfer limitations often existed (Cruickshank et al, 2000;Marcelis et al, 2003). However, those studies were all considering relatively well mixed biphasic systems, hence the significant diffusion limitation predicted in the FEBR was not present in these well mixed reactors.…”

Section: à3mentioning

confidence: 95%

Modeling of a foamed emulsion bioreactor: II. model parametric sensitivity

Kan

Deshusses

2008

Biotech & Bioengineering

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The sensitivity of a conceptual model of a foam emulsion bioreactor (FEBR) used for the control of toluene vapors in air was examined. Model parametric sensitivity studies showed which parameters affect the removal of toluene (as model pollutant) in the FEBR the most significantly, and enabled definition of the limits of the process. Detailed examination of the results indicated that the process is highly complex and that both mass transfer and kinetic limitations can coexist in the bioreactor system. These results will help with the optimization of the design and operation of FEBRs.

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Model description of dibenzothiophene mass transfer in oil/water dispersions with respect to biodesulfurization

Cited by 23 publications

References 30 publications

Study on Mass Transfer of Isopropylbenzene and Oxygen in a Two-Phase Partitioning Bioreactor in the Presence of Silicone Oil

Study on Mass Transfer of Isopropylbenzene and Oxygen in a Two-Phase Partitioning Bioreactor in the Presence of Silicone Oil

Biocatalytic desulfurization (BDS) of petrodiesel fuels

Modeling of a foamed emulsion bioreactor: II. model parametric sensitivity

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