Effective area of a highly efficient random packing

Kolev, Nikolai; Nakov, Svetoslav; Ljutzkanov, L.; Kolev, D.

doi:10.1016/j.cep.2005.10.008

Cited by 31 publications

(19 citation statements)

References 21 publications

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“…Nakov et al, 53 Kolev et al, 61 and Duss et al 54,62 used the Danckwerts technique to analyze the CO 2 absorption into aqueous NaOH for metal and plastic Raschig Super-Rings, metal IMTP, metal Nutter rings, and plastic Ralu-Flow rings. These data give us the opportunity to contrast the IMTP mass-transfer area correlation predictions of Eq.…”

Section: Implications: Mass-transfer Areamentioning

confidence: 99%

New mass‐transfer correlations for packed towers

2011

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in Wiley Online Library (wileyonlinelibrary.com).Rate-based calculations for trayed and packed columns offer process engineers a more rigorous and reliable basis for assessing column performance than the traditional equilibrium-stage approach, especially for multicomponent separations. Although the mathematics, thermodynamics, and transport-related physics upon which nonequilibrium separations theory is founded are generally true, it is also true that rate-based simulations today suffer from a serious weakness-they are ultimately tied to underlying equipment performance correlations with questionable predictive capability. In the case of packed columns operated countercurrently, correlations are required for the masstransfer coefficients, k x and k y , for the specific area participating in mass transfer, a m , for the two-phase pressure drop, (Dp/Z) 2/ , and for the flood capacity of the column. In particular, it is generally well known that packing mass-transfer correlations available in the public domain are unreliable when they are applied to chemical systems and column operating conditions outside of those used to develop the correlations in the first place. For that reason, we undertake the development of dependable, dimensionally consistent, correlating expressions for the mass-transfer-related quantities k x , k y , and a m for metal Pall rings, metal IMTP, sheet metal structured packings of the MELLAPAK type, and metal gauze structured packings in the X configuration, using a new data fitting procedure. We demonstrate the superior performance of these correlations for a wide range of chemical systems and column operating conditions, including distillations as well as acid gas capture with amines. Further, we show that these new correlations lead to predictions for the relative interfacial area participating in mass transfer that can be greatly in excess of the geometrical surface area of the packing itself.

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Section: Implications: Mass-transfer Areamentioning

confidence: 99%

New mass‐transfer correlations for packed towers

2011

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“…Up to now such a high ratio of effective to total surface area of the packing, higher than 1, was observed only in cases with formation of drops and jets in the packing free volume [23,24]. In this investigation this was not the case.…”

Section: Methodsmentioning

confidence: 91%

“…The trough volume is only 15.5 mL. The liquid phase analysis and the calculation of the effective surface area are presented in [23] and also in [2].…”

Section: Methodsmentioning

confidence: 99%

Packing with Stamped Horizontal Lamellae Operating at Extremely Low Liquid Loads II. Effective Surface Area

2007

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In the first part of this investigation a new packing material, specially designed for operation at extremely low liquid superficial velocity, was presented [1]. It consists of narrow, horizontal lamellae stamped in vertical plates with small distances between them. The liquid flows horizontally, wetting practically the whole surface of the lamellae, i.e., strips. One of the most important performance characteristics of packings is their effective surface area. This surface can be either smaller or greater than the specific surface [2]. The results of the investigation into the effective surface of the new packing are presented here. They show that it slowly increased with liquid superficial velocity, L. At the lowest liquid superficial velocity, L, equal to only 2.6 · 10 -5 m 3 /(m 2 s) for a packing with a specific area of 132.7 m 2 /m 3 , and the effective surface area is more than 50 % higher than the specific one. At L = 10 · 10 -5 m 3 /(m 2 s), for the same packing, the effective surface is about twice as high as the specific one.

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“…[1]. For this reason, it is the subject of studies for pressure drop, effective surface area at large intervals of liquid throughput [4], and mass transfer controlled by gas or liquid phase [1,5]. Concerning rectification, only a limited number of model systems is studied, for example, cyclohexane-n-heptane and iso-butane-n-butane [1].…”

Section: Introductionmentioning

confidence: 99%

A Study on Modern High Effective Random Packings for Ethanol‐Water Rectification

Darakchiev

Semkov

2008

Chem Eng & Technol

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Raschig Super-Ring is a modern and high-efficient packing used for intensification of absorption and distillation processes. The aim of this work is to characterize the efficiency of this packing applied to rectification of an important industrial system, ethanol-water, and to compare its efficiency to that of some random packings of the third generation as well as to the structured packing, HOLPACK, which is used in the ethanol production industry. The experiments were carried out in a column installation, 0.213 m in diameter with a packing height of 2.8 m. The column is heated by a number of electrical heaters (total power 45 kW), which can be switched gradually. Operation at total and partial reflux is possible. Eight types of random packings were studied: five types of Raschig Super-Ring, four metallic (with characteristic dimensions 0.5, 0.6, 0.7, and 1") and one of plastic material 0.6"; two types of packing IMTP and one plastic Ralu Flow. Some experiments were conducted at total reflux operation at vapor velocity, 0.253-0.936 m/s, and liquid superficial velocity, 4.44 · 10

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Effective area of a highly efficient random packing

Cited by 31 publications

References 21 publications

New mass‐transfer correlations for packed towers

New mass‐transfer correlations for packed towers

Packing with Stamped Horizontal Lamellae Operating at Extremely Low Liquid Loads II. Effective Surface Area

A Study on Modern High Effective Random Packings for Ethanol‐Water Rectification

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