Influence of the viscosity on the liquid hold-up in trickle-bed reactors with structured packings

Sidi-Boumedine, Réda; Raynal, Ludovic

doi:10.1016/j.cattod.2005.06.040

Cited by 27 publications

(17 citation statements)

References 9 publications

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“…For both packings, h L is proportional to Q L . This trend is similar to the one observed by Sidi-Boumedine and Raynal (2005) for SMV structured packing, and present results are in agreement with Linek et al data. It indicates that a plug liquid flow could be assumed for IMTP50, and confirms that the liquid distributor does not influence present results.…”

Section: Liquid Hold-upsupporting

confidence: 96%

“…A power law of 0.13 and 0.17 is followed for the MellapakPlus 252.Y and the IMTP50 respectively. This is in agreement with Sidi-Boumedine and Raynal (2005) and Stichlmair et al (1989) for L lower than 5 cP.…”

Section: Liquid Hold-upsupporting

confidence: 91%

“…By adding polyacrylamides (FA920) in water (0.1 wt%), the liquid viscosity, L , has been varied from 1 to 2.5 cP, which covers the reference industrial operating conditions for MEA at 30% wt. It was checked that the surface tension of these solutions, , were identical (Sidi-Boumedine and Raynal, 2005). Thus, the surface tension has no effect on the present results, the effect of viscosity only being looked at.…”

Section: Operating Conditionsmentioning

confidence: 95%

“…The latter is very similar to the tested structured packing but at packing junctions: junctions of the high capacity version are smooth thanks to the metal sheets curvature (Sulzer Chemtech Brochures). Results are also compared to a simple 1D model which assumes a fully wetted packing and a fully developed laminar falling film (Sidi-Boumedine and Raynal, 2005). No empirical constant is needed for the 1D model.…”

Section: Structured Packingmentioning

confidence: 98%

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Liquid distribution and liquid hold-up in modern high capacity packings

Alix

Raynal

2008

Chemical Engineering Research and Design

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Section: Liquid Hold-upsupporting

confidence: 96%

Section: Liquid Hold-upsupporting

confidence: 91%

Section: Operating Conditionsmentioning

confidence: 95%

Section: Structured Packingmentioning

confidence: 98%

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Liquid distribution and liquid hold-up in modern high capacity packings

Alix

Raynal

2008

Chemical Engineering Research and Design

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“…Measurements of the liquid film thickness are highly desired since modeling and simulation of the separation column performance often require assumptions on the liquid film thickness and its distribution on the solid structure, particularly in packings of corrugated sheets [21,33,41,42]. Furthermore, the distribution of the liquid phase in the packing cross-section and its local flow patterns, e.g., films and rivulets, contribute significantly to the pressure drop.…”

Section: High-resolution Gamma-ray Tomographymentioning

confidence: 99%

Advanced Tomographic Techniques for Flow Imaging in Columns with Flow Distribution Packings

Schubert

Bieberle

Barthel

et al. 2011

Chemie Ingenieur Technik

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Design and optimization of separation units, e.g., distillation and absorption columns with flow distribution packings, require detailed knowledge about the internal flow conditions and their impact on the process behavior. This in turn calls for suitable measuring techniques, which can give a detailed insight into such devices, especially for studies on a laboratory and pilot scale. Traditional instrumentation, such as compartment-type liquid collectors installed below packings, or distributed temperature, pressure and conductivity probes, often falls too short if detailed knowledge on flow conditions is required. This concerns especially local liquid holdup, liquid maldistribution, liquid films thickness, wetting of the packing surface, or bubble size and droplet distribution at trays. Advanced imaging techniques, such as tomography, have found only marginal attention in investigations of separation columns with structured and modern dumped flow distribution packings, mostly due to limited spatial and temporal resolution but also due to prevailing technological problems encountered in such applications. In this study, the potentials and limits of some of the most recently emerged tomographic imaging modalities for multiphase flows have been investigated and reviewed, i.e., ultra-fast X-ray tomography, high-resolution gamma-ray tomography, wire-mesh sensor techniques, and X-ray microtomography with respect to a possible application in separation columns with flow distribution packings.

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A dimensionless model for predicting the mass‐transfer area of structured packing

et al. 2011

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The mass-transfer area of nine structured packings was measured in a 0.427 m ID column via absorption of CO 2 from air into 0.1 kmol/m 3 NaOH. The mass-transfer area was most strongly related to the specific area (125-500 m Áh). Surface tension (30-72 mN/m) had a weaker but significant effect. Gas velocity (0.6-2.3 m/s), liquid viscosity (1-15 mPaÁs), and flow channel configuration had essentially no impact on the mass-transfer area. Surface texture (embossing) increased the effective area by 10% at most. The ratio of mass-transfer area to specific area (a e /a p ) was correlated within the limits of AE13% for the entire experimental database a e a p ¼ 1:34

show abstract

Influence of the viscosity on the liquid hold-up in trickle-bed reactors with structured packings

Cited by 27 publications

References 9 publications

Liquid distribution and liquid hold-up in modern high capacity packings

Liquid distribution and liquid hold-up in modern high capacity packings

Advanced Tomographic Techniques for Flow Imaging in Columns with Flow Distribution Packings

A dimensionless model for predicting the mass‐transfer area of structured packing

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