Liquid-side mass transfer coefficient for a hydrogen—edible oil system in an agitated reactor

Ganguli, Keshab L.; Berg, Henk J. van den

doi:10.1016/0300-9467(80)85072-6

Cited by 5 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Mass Transfer Coefficient, k L . Mass transfer coefficient values for O 2 and N 2 are depicted in Figure 12, and as can be seen contrary to the findings by Calderbank and Moo-Young (1961), Hyman (1962), and Ganguli and van den Berg (1980), k L values of both gases appeared to increase with mixing speed. Similar findings were reported by a number of investigators (Davies et al, 1964;Yoshida and Miura, 1963;Prasher and Wills, 1973;Versteeg et al, 1987;, 1988c).…”

Section: Volumetric Mass Transfer Coefficient K L Acontrasting

confidence: 60%

Mass Transfer Parameters of O₂ and N₂ in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

Tekie

Morsi

1997

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The solubility, volumetric mass transfer coefficient, gas−liquid interfacial area, mass transfer coefficient, gas holdup, and bubble Sauter mean diameter for O2 and N2 in liquid cyclohexane were obtained in 4-L gas-inducing and surface-aerated agitated reactors. The modified Peng−Robinson equation of state and the transient gas absorption and photographic techniques were employed. The experiments were statistically designed and the results were statistically correlated with a 95% confidence level. The solubilities for O2 and N2 showed an increase with pressure and temperature, and Henry's law adequately modeled the values. All mass transfer parameters obtained were found to be higher in the gas-inducing than those in the surface-aerated reactor. Mixing speed and liquid height significantly affected the volumetric mass transfer coefficients and gas holdup in both reactors. The pressure and temperature slightly affected the volumetric mass transfer coefficients whereas the bubbles Sauter mean diameter for both gases remained constant at about 0.76 mm.

show abstract

Section: Volumetric Mass Transfer Coefficient K L Acontrasting

confidence: 60%

Mass Transfer Parameters of O₂ and N₂ in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

Tekie

Morsi

1997

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

Mass transfer and solubility in autocatalytic oxidation of cyclohexane

1988

View full text Add to dashboard Cite

Mass transfer coefficients for the solution, without reaction, of oxygen in cyclohexane over a wide range of temperature and pressure have been measured in a flat interface reactor (FIR) and a gas sparged stirred-tank reactor (STR). Solubilities have also been measured and it is suggested that a modified Henry's law coefficient of 1.09 x lo-' kmol/m3 . bar can be regarded as constant over the temperature range 293-435 K. The physical mass transfer coefficient in the STR shows very little variation over this temperature range and a value of 3.5 x m / s can be assumed for 423-435 K. However, coefficients in the FIR increase with agitation rate as expected. The difference is ascribed to interference by neighboring bubbles in the transfer process, when diffusivities are high, and also to the lowering of surface tension at high temperatures. A model proposed by Gal-Or and Resnick is reviewed in its application to the present system.

show abstract

Selektivhydrierung von Fettstoffen mit metallorganischen Mischkatalysatoren nach Ziegler‐Sloan‐Lapporte I: Selektive Hydrierung von Linolsäuremethylester und Modelldienen mit isolierten Doppelbindungen

Fell

Schäfer

1990

Fett/Lipid

View full text Add to dashboard Cite

Linolsauremethylester 1XBt sich mit homogenen Ziegler-Slom-Lapporte-Katalysatoren auf Nickel-, Cobalt-oder Palladiumbasis unter sehr milden Bedingungen selektiv zum einfach ungesattigten Produkt hydrieren. Die Frage, ob dieses Verhalten durch die 1,bStellung der beiden Doppelbindungen im Linolsaureester verursacht wird, fihrte zu Hydriewersuchen an nichtkonjugierten a,w-Dienen unterschiedlicher Kettenlkge. Dabei zeigte sich, daB in dieser Homologenreihe eine signifkante Selektivitfit zur Monoolefihildung nur im Falle des 1,bPentadien gegeben ist. Bei den Dienen, deren Doppelbindungen weiter auseinanderliegen als in der Lmolsaure, macht sich eine Selektiviat fiir das Monohydrierungsprodukt nur noch in untergeordnetem MaBe oder nicht mehr bemerkbar. Zur Erklaung wird ein Modell mit unterschiedlich stabilen Katalysator-Substrat-Komplexen vorgeschlagen. Selective Hydrogenation of Fats and DerivativesUsing Ziegler-Type Organometallic Catalysts I: Selective Hydrogenation of Methyl-lino1ea.t and Other Dlenic Compounds with Isolated Double Bonds Homogeneous catalysts of Ziegler-Sloan-Lapporte-type, containing nickel, cobalt or palladium, were used to hydrogenate methyllinoleate under very mild conditions selectively to monounsaturated products. The question, wether this selectivity is caused by the 1,4-position of the olefmic double bonds, led to hydrogenation experiments with non-conjugated a,o-dienes of different chain length. A significant selectivity was only observed for the reduction of 1,Cpentadiene to pentene, dienes with greater distance between the double bonds than in lioleic acid were hydrogenated with less selectivity. To explain these facts, a kinetic model, including catalyst-substratecomplexes of different stabilities, is proposed. denen die Partialhydrierung von linolensaureesterhaltigen Substraten beschrieben wird23, 24. .A u f g a b e n s t e l l u n g Ein Ziel der Untersuchungen im Rahmen des BMFT-Forschungsverbundvorhabens ,,Neue Einsatzmoglichkeiten nativer Ole und Fette als Chemierohstoffe" ist die verbesserte Selektivhydrierung mehrfach ungesattigter Fettsaureester mit homogenen metallorganischen Mischkatalysatoren nach Ziegler. Durch gezielte Modifhtion der Katalysatorsysteme sol1 insbesondere die Partialhydrierung von Linol-und Linolensaureestern unter gleichzeitiger Riickdrihgung von Stellungs-und cisham-Isomerisierungen der verbleibenden Doppelbindungen erreicht werden. H3COOC----C18:3(9c,12c,15c) a-Linolensauremethylester CKat.1 +H2 H3COOC-L -C18:2 Octadecadiensaurernethylester-lsomerengernisch hier: C18:2(9c,12c) Linolsaurernethylester H,COOC C18:l Octadecensauremethylester-lsomerengemisch hier: C18:1(9c) ulsaurernethylester 'Kat-1i..2

show abstract

Liquid-side mass transfer coefficient for a hydrogen—edible oil system in an agitated reactor

Cited by 5 publications

References 3 publications

Mass Transfer Parameters of O₂ and N₂ in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

Mass Transfer Parameters of O₂ and N₂ in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

Mass transfer and solubility in autocatalytic oxidation of cyclohexane

Selektivhydrierung von Fettstoffen mit metallorganischen Mischkatalysatoren nach Ziegler‐Sloan‐Lapporte I: Selektive Hydrierung von Linolsäuremethylester und Modelldienen mit isolierten Doppelbindungen

Contact Info

Product

Resources

About

Liquid-side mass transfer coefficient for a hydrogen—edible oil system in an agitated reactor

Cited by 5 publications

References 3 publications

Mass Transfer Parameters of O2 and N2 in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

Mass Transfer Parameters of O2 and N2 in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

Mass transfer and solubility in autocatalytic oxidation of cyclohexane

Selektivhydrierung von Fettstoffen mit metallorganischen Mischkatalysatoren nach Ziegler‐Sloan‐Lapporte I: Selektive Hydrierung von Linolsäuremethylester und Modelldienen mit isolierten Doppelbindungen

Contact Info

Product

Resources

About

Mass Transfer Parameters of O₂ and N₂ in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach

Mass Transfer Parameters of O₂ and N₂ in Cyclohexane under Elevated Pressures and Temperatures: A Statistical Approach