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

Alix, Pascal; Raynal, Ludovic

doi:10.1016/j.cherd.2008.02.021

Cited by 32 publications

(23 citation statements)

References 12 publications

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“…The channel dimensions (S, B, h) matched those of M250Y, and the specific area was assumed to be 250 m 2 /m 3 as well. (Alix and Raynal 35 notably listed slightly different dimensions for MP252Y than the values in Table 2, but even if their numbers were used, the calculated wetted perimeters of MP252Y and M250Y would still be within 3% of each other.) The M250Y and MP252Y data ( Figure 10) were indistinguishable, which would suggest that the joint does not tangibly contribute to the mass-transfer area.…”

Section: Effect Of Corrugation Angle (M250y/m250x) and Element Interfmentioning

confidence: 93%

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

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Section: Effect Of Corrugation Angle (M250y/m250x) and Element Interfmentioning

confidence: 93%

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

et al. 2011

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“…This relation means that there is no additional redistribution of the liquid flow rate across the section at packing elements junctions. Actually, an accumulation of liquid in this zone due to capillary effects that generates a liquid film attached to the extremities of the packing metal sheets has been experimentally reported . The liquid saturation at junctions between packing units is twice more important than in the interior of the packing unit.…”

Section: Resultsmentioning

confidence: 99%

Gas–liquid flow modeling in columns equipped with structured packing

et al. 2014

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International audienceThis paper deals with the modeling of gas-liquid flow in distillation columns equipped with structured packing. The devices are seen as bi-structured porous media and a macro-scale model is proposed taking into account this specific geometry. In this model, the two liquid films, one-per-sheet, are treated separately and are allowed to exchange matter at the vicinity of the contact points between corrugated sheets. The model emphasizes mechanisms that lead to the liquid radial dispersion effects: a main part comes from the geometry itself, another part is due to the capillary effects. A particular attention is paid to model these phenomena from a macro-scale point of view. Finally, the simulation results are confronted to tomography imaging within a lab-scale column and show a qualitative good agreement of the liquid distribution

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“…, and then the mean residence time

τ_{m}

could be calculated by the Eq.

E true(τ true) = \frac{C true(τ true)}{{false\int}_{0}^{\infty} C true(τ true) normald τ}

τ_{m} = {false\int}_{0}^{\infty} τ E true(τ true) normald τ

…”

Section: Resultsmentioning

confidence: 99%

Liquid‐bridge flow in the channel of helical string and its application to gas–liquid contacting process

Cong

Zhao

et al. 2018

AIChE Journal

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To solve the problems of the traditional packings, such as high pressure drop, mal-distribution and short liquid residence time, a helical flow structured packings was proposed. Two different flow patterns, liquid-bridge flow and liquiddrop flow were identified when the width of the channel of the helical string was adjusted. Moreover, the characteristics of the helical liquid-bridge flow including maximum liquid loading, mean thickness of liquid film, mean residence time and effective specific surface area, were examined. And the separation efficiency was studied by the lab-scale distillation column. In comparison, the effective specific surface area of the helical flow type packings is almost as large as the traditional B1-350Y structured packings, but with thinner liquid film, longer liquid residence time and finally higher separation efficiency.

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

Cited by 32 publications

References 12 publications

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

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

Gas–liquid flow modeling in columns equipped with structured packing

Liquid‐bridge flow in the channel of helical string and its application to gas–liquid contacting process

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