Interfacial areas and gas hold‐ups at elevated pressures in a mechanically agitated gas‐liquid reactor

Oyevaar, M.H.; Zijl, Ad; Westerterp, Roel

doi:10.1002/ceat.270110102

Cited by 18 publications

(12 citation statements)

References 27 publications

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“…It can be seen that the interfacial areas for a superficial gas velocity equal to 1.0 cm/s remain constant and are independent of pressure. This is qualitatively in good agreement with the results obtained for the same operating conditions by Oyevaar et al (1988). However, for a superficial gas velocity of uG = 3.0 cm/s a small increase in the interfacial area with increasing reactor pressure can be observed; as can be seen in Fig.…”

Section: Mechanically Agitated Gas-liquid Reacforsupporting

confidence: 91%

“…Water is a pure liquid and does not hinder the coalescence of the gas bubbles. However, the coalescence in aqueous solutions of DEA is affected indeed, as has already been observed in the preliminary experiments without antifoam and by Oyevaar et al (1988). …”

Section: Interfacial Areas and Gas Hold-ups In Gas-liquid Contactors supporting

confidence: 71%

“…1). This allows for measurements at moderate pressures and thus for comparison with the results as obtained in similar gas-liquid systems and reactors by Oyevaar et al (1988. On the other hand within a certain range of operating pressures and for otherwise identical conditions measurements can be performed with and without the gas recycle section.…”

Section: Experimental Methodsmentioning

confidence: 95%

“…The mechanically agitated reactor has been designed according to the standard geometry (Oyevaar et al, 1988). Two standard six-bladed disc turbine impellers of DJD = 0.4 and 0.5, respectively, are available for agitation.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…This study is a follow-up of the aforementioned studies of Oyevaar et al (1988, which were limited in their pressure and superficial gas velocity ranges. We will report on interfacial area determinations in a mechanically agitated gas-liquid reactor, equipped with two gas inlets and two turbine impellers of different size, at pressures up to 8.0 MPa and at superficial gas velocities between 1 and 5 cm/s.…”

Section: Manymentioning

confidence: 99%

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Interfacial areas and gas hold-ups in gas—liquid contactors at elevated pressures from 0.1 to 8.0 MPa

Oyevaar

Bos

Westerterp

1991

Chemical Engineering Science

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Abstract--Interfacial areas and gas hold-ups have been determined at pressures up to 8.0 MPa in a mechanically agitated gas-liquid reactor and a bubble column with a diameter of 81 mm for superficial gas velocities between 1 and 5 and 1 and 10 cm/s, respectively. The interfacial areas have been determined by the chemical method using the model reaction between CO, and aqueous diethanolamine (DEA). Contrary to earlier reported results on interfacial area in a mechanically agitated reactor at pressures up to 1.7 MPa, a positive influence of pressure on the inter?acial areas has been observed for higher pressures and higher superficial gas velocities. The product of the gas density pc and the superficial gas velocity at the orifice vG,or was found to be an important parameter for the manifestation of the pressure effect. For values of pG~G,or larger than 200 kg/m2 s the interfacial areas increase with increasing reactor pressure. Below this value of 200 kg/m2 s no influence of pressure could be observed. The gas hold-ups in the bubble column in water as well as in an aqueous solution of DEA with antifoam increase with increasing pressure. This pressure effect on the gas hold-up in bubble columns originates from the formation of smaller bubbles at the gas distributor. The relative increase in the gas hold-ups is smaller in water and also if a porous plate instead of a perforated plate is used as gas distributor. The differences in the magnitude of the pressure effect are caused by differences in the coalescence bchaviour of the gas bubbles in both liquids and by differences in the bubble formation process at the two types of gas distributors, respectively. The interfacial areas in the bubble column also increase with increasing pressure. The relative increase in the interfacial areas ap/ual, with increasing pressure may be as large as 200% for a pressure increase from P = 0.15 to 8.0 MPa, depending on the type of gas distributor and the superficial gas velocity used.

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Section: Mechanically Agitated Gas-liquid Reacforsupporting

confidence: 91%

Section: Interfacial Areas and Gas Hold-ups In Gas-liquid Contactors supporting

confidence: 71%

Section: Experimental Methodsmentioning

confidence: 95%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Manymentioning

confidence: 99%

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