Hydrodynamic effects in bench scale hydrotreaters operating in cocurrent gas-liquid upflow mode

Papayannakos, N.; Galtier, P.; Bigeard, Pierre Henri; Kasztelan, S.

doi:10.1016/0009-2509(92)87047-t

Cited by 15 publications

(21 citation statements)

References 5 publications

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“…For the upflow mode of operation with beds SR1 and SR2 the Peclet number is the same for any liquid superficial velocity at constant u GS /u LS values. Similar results have been reported in an earlier work (Papayannakos et al, 1992) for a non-diluted bench-scale fixed bed reactor in upflow mode. It is also obvious that for the SR1 bed the Peclet number is greater than 100 for u GS /u LS values less than 20 while for higher values of this ratio the Peclet number is quite constant and equal to 100.…”

Section: Estimated Peclet Hold-up and Pressure Drop Valuessupporting

confidence: 91%

“…The estimated values of liquid hold-up (H L ) for all the spiral reactors used in this study were lower than 0.5, smaller enough values than the estimated in other works for conventional laboratory fixed beds (Papayannakos et al, 1992;Thanos et al, 1996).…”

Section: Estimated Peclet Hold-up and Pressure Drop Valuescontrasting

confidence: 73%

“…Upflow operation improves catalyst wetting and utilization (De Wind et al, 1988;Khadilkar et al, 1996) but extended liquid phase mixing problems in non-diluted beds affect the reactor performance (Papayannakos et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fluid dynamic characteristics of a structured bed spiral mini-reactor

Kallinikos

Papayannakos

2007

Chemical Engineering Science

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Section: Estimated Peclet Hold-up and Pressure Drop Valuessupporting

confidence: 91%

Section: Estimated Peclet Hold-up and Pressure Drop Valuescontrasting

confidence: 73%

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Fluid dynamic characteristics of a structured bed spiral mini-reactor

Kallinikos

Papayannakos

2007

Chemical Engineering Science

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“…Upward flow operation improves catalyst wetting and utilization [7,8], but extended liquid-phase mixing problems in non-diluted beds affect the reactor performance [9].…”

Section: Introductionmentioning

confidence: 99%

Fluid Flow Characteristics of String Reactors Packed with Spherical Particles

et al. 2011

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A hydrodynamic investigation of three geometries of string pellet reactors filled with spheres was conducted. Two geometries were circular spiral channels, while the third was a straight horizontal square channel. Stimulus-response experiments provided data for residence time distribution analysis from which Pe numbers and liquid holdup were deduced. Flow regimes and transitions were determined from visual observations through the transparent tube wall. For the whole range of the experimental conditions applied in this work and for all reactors, the ratio of gas to liquid velocities, V g /V l , is a controlling parameter for Pe number, holdup, and pressure drop.

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“…συμπεράσματα έχουν αναφερθεί σε προηγούμενη εργασία (Papayannakos et al, 1992) για μια μη αραιωμένη κλίνη πιλοτικής κλίμακας αντιδραστήρα σε λειτουργία σε ανωροή. Στο Σχήμα 5.11 παρουσιάζονται τα αποτελέσματα του αριθμού Peclet σε σχέση με την επιφανειακή ταχύτητα υγρής φάσης (u LS ) και το λόγο των επιφανειακών ταχυτήτων αέριας προς υγρής φάσης (u GS /u LS ), όπως προέκυψαν για τον αντιδραστήρα SR1-C σε λειτουργία σε κατωροή με χρήση υδατικών διαλυμάτων χλωριούχου καλίου σαν υγρή φάση.…”

Section: αβεβαιότητα εκτίμησης των ρευστοδυναμικών παραμέτρων με ψυχρά πειράματαunclassified

Κλιμάκωση Μεγέθους Καταλυτικών Αντιδραστήρων Υδρογονοεπεξεργασίας Καυσίμων

Kallinikos¹,

Καλλίνικος²

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The aim of this thesis is the study of a new type of structured bed, called spiral reactor, for the scaling down of three phase reactors using the gasoil hydrotreatment process as an application. The procedure followed consisted of two parallel experimental methods investigating the mechanisms involved in the operation of the reactors. The first method aims at the study of the process mechanisms with mock up experiments at ambient conditions using systems with inorganic or organic liquids and nitrogen or oxygen as gas phase. The second one focuses on the mechanisms at reaction conditions using model reactions, like benzene hydrogenation or hydrotreatment of gasoil fractions. The studied mechanisms are the fluid dynamic characteristics of the operation of the spiral reactor like the flow regime, the axial dispersion, as well as the mass transfer limitations.

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Hydrodynamic effects in bench scale hydrotreaters operating in cocurrent gas-liquid upflow mode

Cited by 15 publications

References 5 publications

Fluid dynamic characteristics of a structured bed spiral mini-reactor

Fluid dynamic characteristics of a structured bed spiral mini-reactor

Fluid Flow Characteristics of String Reactors Packed with Spherical Particles

Κλιμάκωση Μεγέθους Καταλυτικών Αντιδραστήρων Υδρογονοεπεξεργασίας Καυσίμων

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