Mass Transfer Coefficients for Suspended Particles in Agitated Vessels and Bubble Columns

Sano, Yuji; Yamaguchi, Nobutaka; Adachi, Toshiro

doi:10.1252/jcej.7.255

Cited by 222 publications

(102 citation statements)

References 3 publications

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“…That value agrees well with the classical Fr€ ossling equation 12,43,44 in which the exponent of particle Reynolds number is 1/2. Gholap et al 10 and Teshima and Ohashi 39 have reported a lower exponent of particle Reynolds number equal to 0.41 while Sano et al 45 reported an exponent of particle Reynolds number equal to 0.25 for agitated vessels and bubble columns. In our system the constant term A equals 1.86.…”

Section: =3mentioning

confidence: 99%

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Stamatiou

Muller

2016

AIChE Journal

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A methodology for the determination of mass transfer resistances of fast reactions in three-phase mechanically agitated slurry reactors under the reaction conditions is presented. The mass transfer resistances affect significantly the overall mass transfer rate, the design equation and consequently the scale up of the reactor. There is not established methodology to separate the mass transfer resistances under reaction conditions by changing catalyst loading and manipulating the process variables, pressure and agitation speed. This allows to avoid the use of different catalyst particles and give the chance to calculate the mass transfer resistances without caring about the type of catalyst. We calculate each mass transfer resistance under conditions which do not allow to neglect any of the resistances. It is shown that the level off of mass transfer rate which is developed in the plot of mass transfer rate against agitation speed plots is not enough to determine the limiting regime. The hydrogenation of styrene over Pd/C (5% catalyst content) is used as case study to demonstrate the methodology.

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Section: =3mentioning

confidence: 99%

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Stamatiou

Muller

2016

AIChE Journal

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“…Using the same value of E an almost identical result can be found with the equation derived by Sano et al [21]. The latter relation has been used by Van Streun et al [4] The influence of intraparticle mass transport on the observed rates has been estimated using the Weisz-Prater criterion [22] for the reaction rates related to the CoPcTS containing mass fraction of catalyst particles.…”

Section: Performance Of the Catalyst Towards The Oxidative Coupling Omentioning

confidence: 58%

Quaternised poly(4-vinylpyridine) anchored on a macroporous poly(trimethylolpropane trimethacrylate-methylmethacrylate) resin, as cocatalyst in the cobaltphthalocyanine catalysed oxidative coupling of 2-mercaptoethanol

Ratering¹,

Meuldijk²,

Piet³

et al. 1993

Reactive Polymers

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Quaternised poly(4-vinylpyridine) anchored on a macroporous poly(trimethylolpropane trimethacrylatemethylmethacrylate) resin, as cocatalyst in the cobaltphthalocyanine catalysed oxidative coupling of 2-mercaptoethanol Ratering, M.T.; Meuldijk, J.; Piet, P.; German, A.L. Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Ratering, M. T., Meuldijk, J., Piet, P., & German, A. L. (1993). Quaternised poly(4-vinylpyridine) anchored on a macroporous poly(trimethylolpropane trimethacrylate-methylmethacrylate) resin, as cocatalyst in the cobaltphthalocyanine catalysed oxidative coupling of 2-mercaptoethanol. Reactive Polymers, Ion Exchangers, Sorbents, 19(3), 233-246. DOI: 10.1016/0923-1137(93)90081-P General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Reactive Polymers, 19 (1993) (Received November 13, 1992; accepted January 5, 1993) AbstractImmobilisation of expensive homogeneous catalysts is important for their application in commercial processes. Quaternised poly(4-vinylpyridine), which is a good promotor of the cobalt(II)phthalocyanine-tetra(sodium sulphonate) catalysed oxidative coupling of 2-mercaptoethanol, has been anchored on a macroporous resin being prepared by copolymerisation of trimethylolpropane trimethacrylate and methyl methacrylate. The performance of the catalyst was only slightly lower than that of the homogeneous analogue. This remarkable result has been attributed to the large pores, which allow a post-copolymerisation of 4-vinylpyridine with the residual double bonds leading to a flexible and accessible polymeric cocatalyst.

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“…The gas flow rate was measured with a Brooks Mass controller 5851E while O 2 and CO 2 were monitored at the in and outlet with a paramagnetic O 2 analyser (Sybron 540A) and infrared CO 2 analyser (Sybron, Anatek PSA 402). The volumetric mass transfer coefficient obtained at maximum pellet concentration (k L a) (h -1 ) was derived from the O 2 mass balance in the bioreactor (Sano et al 1974). O 2 uptake rate.…”

Section: Mathematical Modellingmentioning

confidence: 99%

“…The liquid to pellet mass-transfer coefficient (k p a p ) was calculated using the Sano, Yamaguchi and Adachi correlation (Sano et al 1974). This correlation is based on Kolmoghorov's theory of local isotropic turbulence and is independent of the geometry of the equipment or the method energy input used.…”

Section: Mathematical Modellingmentioning

confidence: 99%

Mass Transfer in Bioreactors

Chávez¹,

González²,

Ruiz³

et al. 2011

Mass Transfer in Multiphase Systems and Its Applications

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Mass Transfer Coefficients for Suspended Particles in Agitated Vessels and Bubble Columns

Cited by 222 publications

References 3 publications

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Determination of mass transfer resistances of fast reactions in three‐phase mechanically agitated slurry reactors

Quaternised poly(4-vinylpyridine) anchored on a macroporous poly(trimethylolpropane trimethacrylate-methylmethacrylate) resin, as cocatalyst in the cobaltphthalocyanine catalysed oxidative coupling of 2-mercaptoethanol

Mass Transfer in Bioreactors

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