Solid—liquid mass trasnfer in packed bubble columns

Jadhav, S.V.; Pangarkar, Vishwas G.

doi:10.1016/0009-2509(90)85037-e

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…The initial decrease of k ls with increasing gas velocity is in contrast with the data found in literature for k ls in packed beds. Jadhav and Pangarkar,22 Trivizadakis and Karabelas,24 Nikov and Delmas,25 and Hassan et al26 observed an increase of k ls with increasing gas velocity. Jadhav and Pangarkar22 observed a constant k ls for Raschig rings and gas velocities exceeding 0.25 m

_{g}^{3}

_{r}^{−2}

s −1 .…”

Section: Resultsmentioning

confidence: 96%

“…Jadhav and Pangarkar,22 and Goto et al23 measured k ls for Raschig and Pall rings and spherical particles, respectively. They observed that k ls increases with increasing gas velocity and increasing liquid velocity.…”

Section: Resultsmentioning

confidence: 99%

“…They observed that k ls increases with increasing gas velocity and increasing liquid velocity. Typical values for k ls for cocurrent gas–liquid flow through packed beds are in the order of magnitude of 10 −5 to 10 −4 m

_{l}^{3}

_{i}^{−2}

s −1 22, 24, 25. For structured packings consisting of corrugated sheets, k ls has been found to be in the order of magnitude of 5 × 10 −7 to 5 × 10 −5 m

_{l}^{3}

_{i}^{−2}

s −1 3, 13, 14.…”

Section: Resultsmentioning

confidence: 99%

“…The effect of liquid velocity on k ls is approximately the same for all gas velocities. Literature shows that k ls is proportional to u

_{l}^{n}

, where various values for n have been found, typically ranging from 0.34 to 0.8 22–24, 26–28. Rode et al28 recalculated the correlation of Specchia et al29 to include the interstitial Reynolds number into the correlation, and found a value of 1.244 for n .…”

Section: Resultsmentioning

confidence: 99%

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Liquid–solid mass transfer for cocurrent gas–liquid upflow through solid foam packings

et al. 2010

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This article presents the liquid-solid mass transfer characteristics for cocurrent upflow operated gas-liquid solid foam packings. Aluminum foam was used with 10, 20, and 40 pores per linear inch (PPI), coated with 5 wt % Pd on c-alumina. The effects of gas velocity (u g ¼ 0.1À0.8 m , which is in the same range as found for random packings and corrugated sheet packings. V V C 2010 American Institute of Chemical Engineers AIChE J, 56: 2923AIChE J, 56: -2933AIChE J, 56: , 2010 Keywords: chemical reactors, mass transfer, multiphase reactors, packed beds, solid foam IntroductionFor the design of chemical reactors, one has to deal with hydrodynamics, heat and mass transfer, and catalyst activity. For heterogeneously catalyzed reactions, the rate of the reaction is often limited by mass transfer instead of the intrinsic kinetics. The rate-limiting step can be the gas-liquid mass transfer, liquid-solid mass transfer, and intraparticle diffusion. These limitations reduce the overall conversion and selectivity of the process. The effect of mass transfer and diffusion limitation can be reduced by the application of a suitable packing as a catalyst support. Classically, so-called random packings have been used, e.g., porous spherical particles or Berl saddles. However, with structured packings, an even higher selectivity and conversion can be obtained. Different types of packings have been discussed in literature, i.e., monoliths, 1 Sulzer Katapak elements, 2,3 cloths, 4 and fibers.5 A general review describing the different aspects of structured packings (e.g., pressure drop, mass transfer characteristics, residence time distribution) is given by Pangarkar et al. 6 The use of a (structured) packing also overcomes the cumbersome step of catalyst separation, which is often encountered in slurry reactors.Another type of structured packing is the solid foam packing, a highly porous open celled material. The structure of the solid foam resembles the inverse of a packed bed of spherical particles. 7 The average cell size is often expressed in pores per linear inch (PPI). Solid foam is commercially available in a range of 5-100 PPI in a wide variety of materials, e.g., ceramics, metals, plastics, and carbon. The porosity of the solid foam ranges from 80 to 97%.Stemmet et al., [8][9][10] Twigg and Richardson, 11 and Garrido et al. 12 have shown that the pressure drop of solid foam is low compared to the pressure drop of conventional packed beds. Also, high gas-liquid mass transfer rates have been reported, k gl a gl up to 0.6 m 3 l m À3 r s À1 .10 These high mass transfer rates have been attributed to the high interfacial area of the solid foam. In addition to the gas-liquid mass transfer rate, also the liquid-solid mass transfer is important in the design of gas-liquid-solid reactors. Only a limited amount Correspondence concerning this article should be addressed to J. C. Schouten at j.c.schouten@tue.nl. This work focuses on quantifying the liquid-solid mass transfer coefficient for cocurrent gas-liquid upflow through solid fo...

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_{g}^{3}

_{r}^{−2}

s −1 .…”

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

_{l}^{3}

_{i}^{−2}

s −1 22, 24, 25. For structured packings consisting of corrugated sheets, k ls has been found to be in the order of magnitude of 5 × 10 −7 to 5 × 10 −5 m