Evaluation of performance improvements through application of anisotropic foam packings in rotating packed beds

Gładyszewski, Konrad; Groβ, Kai; Bieberle, André; Schubert, Markus; Hild, Marvin; Górak, Andrzej; Skiborowski, Mirko

doi:10.1016/j.ces.2020.116176

Cited by 14 publications

(14 citation statements)

References 41 publications

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“…This is attributed to several factors: First, the investigated chemical systems have different fluid properties, i.e., surface tension, dynamic viscosity, that affect the mass transfer between both fluids. Second, the metal foam in RPB A has a lower specific surface area, which results in a lower effective interfacial area of the fluids …”

Section: Resultsmentioning

confidence: 99%

“…Second, the metal foam in RPB A has a lower specific surface area, which results in a lower effective interfacial area of the fluids. 23 To summarize all results, FRSs have to be preferred over LSs in the application of RPBs, as they are distinguished by increased tightness even in applications with higher rotational speeds than normally used in RPBs. Due to their lower clearance, the tightness is increased, leading to a higher overall separation performance of the plant.…”

Section: Investigation Of Wearing Of Frs: Rpb Bmentioning

confidence: 99%

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Impact of Vapor Bypasses on Separation Performance of Rotating Packed Beds in Distillation

Pyka

Ressemann

Held

et al. 2023

Ind. Eng. Chem. Res.

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The impact of different sealing types and their wearing on the separation performance in distillation processes in rotating packed beds (RPB) has been investigated, which potentially causes bypass flows inside the unit. In the literature, a maximum separation performance is observed, which can have several possible explanations. Next to the theory that with increasing rotational speed a lower residence time counteracts the mass transfer intensification, one theory is that there are undetected bypasses from the casing of the unit to the eye of the rotor. Besides the effect of the maximum, the latter would indicate the fact that bypasses generally induce lower separation performance in RPBs. However, with a suitable sealing concept, higher separation performances could be achieved in the units. Therefore, the influence of bypass flows on the separation performance was investigated by installing different sealings in the RPB, which has not yet been discussed. For this purpose, two sealing types, a labyrinth and a floating ring sealing, were tested in two different RPBs of similar design. The results showed that the labyrinth sealing was less effective than the floating ring sealing in reducing the bypass mass flow. For the floating ring sealing, the separation performance dropped with increasing operation time due to abrasion and wearing. The results also showed that, in general, with increasing rotational speed, the tightness of the sealings is reduced, leading to the formation of bypass streams that reduce the separation performance of the plant. The study highlights the need for greater awareness of bypasses in RPBs especially concerning the separation performance and emphasizes the demand to develop more efficient and effective sealing systems that are ideally nonabrasive, require no additional fluids, and have higher tightness. These findings could call for re-evaluation of previous results, packing evaluations, and derived models.

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Section: Resultsmentioning

confidence: 99%

Section: Investigation Of Wearing Of Frs: Rpb Bmentioning

confidence: 99%

Impact of Vapor Bypasses on Separation Performance of Rotating Packed Beds in Distillation

Pyka

Ressemann

Held

et al. 2023

Ind. Eng. Chem. Res.

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show abstract

“…[4] Inspired by these biomaterials, the development of foams with a controlled cell shape and orientation will add useful properties to high-performance polymers. [5,6] Control of the foam's cellular structure and topology has been achieved by methods like chemical vapor deposition, 3D printing, and freeze-casting. [7][8][9] Anisotropic foams fabricated via freeze casting, where the foam's compartments are assembled into 3D architectures using growing crystals as templates, allows access to a range of porous architectures.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Foams via Frontal Polymerization

et al. 2022

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The properties of foams, an important class of cellular solids, are most sensitive to the volume fraction and openness of its elementary compartments; size, shape, orientation, and the interconnectedness of the cells are other important design attributes. Control of these morphological traits would allow the tailored fabrication of useful materials including highly porous solids, anisotropic heat conductors, tough composites, among others. While approaches like ice templating has produced foams with elongated cells, there is a need for rapid, versatile, and energy efficient methods that also control the local order and macroscopic alignment of cellular elements. Here we describe a fast and convenient method to obtain anisotropic structural foams using frontal polymerization. We fabricated foams by curing mixtures of dicyclopentadiene and a physical blowing agent via frontal ring opening metathesis polymerization (FROMP). The materials were characterized using micro-computed tomography and an image analysis protocol to quantify morphological characteristics including volume fraction and anisotropy. The cellular structure, porosity, and hardness of the foams changed with blowing agent, concentration, and resin viscosity. Moreover, we used a full factorial combination of variables to correlate each parameter with the structure of the obtained foams. We found a strong correlation between the resin viscosity and the foam's cellular structure. Furthermore, a specific combination of input parameters controlled the transitions from (i) isotropic to anisotropic cellular structures, (ii) porous to non-porous, and (iii) soft to hard foams. Our results demonstrate the controlled production of foams with specific morphologies using the simple and efficient method of frontal polymerization. This work shows promise for creating foams with aligned cellular structures that allow anisotropic mass and energy transport properties in high performance structural solids.

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“…Multiple design approaches have been proposed aiming at an even liquid distribution throughout the packing, like multiliquid-inlet rotors , and anisotropic wire mesh or foam packings with a changing morphology along the rotor. − In another approach, split packings with counter-rotating packing rings have been developed to increase phase slip along the packing′s radial length. ,− Gładyszewski and Skiborowski were the first to use additive manufacturing as a relatively inexpensive method for rapid prototyping of packings for RPBs. , Since then, three-dimensional (3D) printing has been used extensively to create tailored anisotropic as well as multiliquid-inlet wire mesh packings and different structured packings like the Zickzack packing and spiral packing leading to more homogeneously distributed liquid holdup. It is expected that the use of 3D printing will be a sustaining trend to customize packings for RPBs and to reveal the interactions between gas and liquid in the rotor …”

Section: Introductionmentioning

confidence: 99%

Zickzack Packings for Deaeration in Rotating Packed Beds─Improved Rotor Design to Counter Bypass Flows

Loll

Runge

Koop

et al. 2022

Ind. Eng. Chem. Res.

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Recently, various internals for rotating packed beds (RPBs) have been developed. However, the technical maturity of these internals is still relatively low compared to packings for columns. In this work, a novel design is proposed for RPBs, consisting of a seal structure combined with a Zickzack packing. The seal structure around the packing was developed to avoid bypasses in the spaces between packing and inner rotor walls, comparable to wall wipers used for structured packings in columns. This design was applied to deaeration experiments using water and nitrogen as stripping gas at rotational speeds from 450 to 1800 rpm. Using sealings, the overall liquid-side volumetric mass-transfer coefficient could be increased by up to 50% compared to the unsealed packing. Furthermore, the Zickzack packing turned out to be more resistant than conventional packings to hydrodynamic effects that lead to the formation of a peaked mass-transfer maximum at a certain rotational speed.

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Evaluation of performance improvements through application of anisotropic foam packings in rotating packed beds

Cited by 14 publications

References 41 publications

Impact of Vapor Bypasses on Separation Performance of Rotating Packed Beds in Distillation

Impact of Vapor Bypasses on Separation Performance of Rotating Packed Beds in Distillation

Anisotropic Foams via Frontal Polymerization

Zickzack Packings for Deaeration in Rotating Packed Beds─Improved Rotor Design to Counter Bypass Flows

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