Evaluation of the validity of tray and point efficiency correlations at elevated liquid viscosities and proposal of an improved point efficiency correlation

Manivannan, Raj Ganesh; Cai, Tony; McCarley, Ken; Vennavelli, Anand N.; Aichele, Clint P.

doi:10.1016/j.cherd.2020.03.022

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…When designing the tray column in chemical separation, the mass transfer efficiency of the column tray is necessary to translate theoretical stages to actual trays. The Murphree point efficiency, Murphree tray efficiency, and overall column efficiency are commonly used to describe the efficiency of trays in column design 43 . The overall column efficiency is the most useful indicator for mass transfer efficiency in separation.…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamic and mass transfer correlations for SiC ceramic foam monolithic trays used in distillation column

Liu

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUNDCellular foam materials are excellent engineering materials for many applications in chemical engineering, especially process intensification of chemical conversions and separation. Recently, a silicon carbide (SiC) ceramic foam monolithic tray was developed as an excellent mass transfer tool to improve distillation and it showed an improved operational flexibility. Previous studies have revealed the effects of open cell diameter and tray thickness on the hydraulic performance and mass transfer efficiency of SiC foam monolithic trays, but relevant correlations are still missing, limiting their practical uses.RESULTSIn this study, based on the published experimental data, empirical correlations were developed to predict the hydrodynamic performance and mass transfer efficiency of SiC ceramic foam monolithic trays. The new correlations include the influence of the tray structure parameters, such as open cell (or pore) diameter and tray thickness, and of the operation conditions (such as the liquid and vapor volumetric flow rates), and the data obtained agree well with the experimental results.CONCLUSIONThe availability of such empirical correlations can be beneficial for the chemical engineering design of practical distillation processes based on SiC foam monolithic trays. © 2023 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

Hydrodynamic and mass transfer correlations for SiC ceramic foam monolithic trays used in distillation column

Liu

et al. 2023

J of Chemical Tech & Biotech

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“…The first approach assumes that the point efficiencies of large- and small-scale trays are identical, provided that the same physical system is used while maintaining the froth conditions. Typical experimental setups used for conducting these experiments include small cross-flow trays as well as Oldershaw columns (e.g., Manivannan et al), in which the liquid on the tray is considered as perfectly mixed, and hence, E OG = E MV . However, this approach does not account for wall effects that are hardly negligible on the small scale and lacks agreed criteria that allow reproducing the large-scale froth condition on a small scale. , The proposed criteria include the fractional approach to flooding, the clear liquid height, and the tray geometry .…”

Section: Revisiting the Efficiency Conceptsmentioning

confidence: 99%

“…Oldershaw columns (e.g., Manivannan et al 24 ), in which the liquid on the tray is considered as perfectly mixed, and hence, 𝐸 OG = 𝐸 MV . However, this approach does not account for wall effects that are hardly negligible at small-scale and lacks agreed criteria that allow reproducing the large-scale froth condition on a small-scale [33][34] .…”

Section: Point Efficiencyunclassified

“…Table 1 also illustrates that only a few studies provide an experimental investigation of the point efficiency on large-scale trays. Instead, it is common practice to measure the point efficiency experimentally using small-scale setups only (e.g., Oldershaw columns 24 ) or to extrapolate its value from measured tray efficiencies using available models. Another approach is using theoretical models or experimental correlations for predicting the number of transfer units that can be related to the point efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Direct Tray and Point Efficiency Measurements Including Weeping Effects through a Convenient Add-On for Air–Water Simulators

Marchini

Vishwakarma

Schubert

et al. 2021

Ind. Eng. Chem. Res.

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A direct approach for determining the tray and point efficiencies of an industrial-scale distillation tray is proposed. The stripping of isobutyl acetate from an aqueous solution with air was used, which is a manageable and nonhazardous method applicable for performance tests in large hydraulic column mockups. This work represents the first application of this system in the case of tray columns exemplified for a sieve tray. A column of 800 mm internal diameter was used for conducting the stripping experiments. The distribution of isobutyl acetate in the liquid phase on the tray was obtained via liquid sampling at several deck positions and UVspectroscopy analysis. A definition for the liquid-side tray efficiency in weeping conditions is proposed together with an experimental approach for determining tray and point efficiencies in such conditions. The derived efficiency data show good agreement with the model predictions and correlations.

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“…В работе [62] предложена новая оценка эффективности тарелки, на основе экспериментальных данных для диапазона вязкости жидкости от 0,2 до 4,2 мПа*с, с учетом диаметра отверстия тарелки и высоту перелива.…”

Section: а) б) в) г)unclassified

Research trends in sieve trays and distillation and adsorbtion equipments

Ravichev¹,

Trushin²,

Yashin³

2021

Proceedings of the International Scientific and Technical Symposium «Improving Energy and Resource Efficiency and Environmental

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A review of publications on gas-liquid devices with a foam regime, published since 2000, generalizations of the main directions of interest to researchers and the results achieved. The main method for studying the foam layer has become computational fluid dynamics, however, the most common models are based on empirical equations for cross-flow trays with round holes. Apparatus with a movable nozzle and centrifugal foam apparatus - two areas of particular interest in the Russian Federation, but did not gain popularity in the world. The research uses new measuring methods: gamma scanning, Doppler interferometry and digital processing of high-speed photographs, spatial probes to determine the structure of the foam layer on industrial-scale trays.

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Evaluation of the validity of tray and point efficiency correlations at elevated liquid viscosities and proposal of an improved point efficiency correlation

Cited by 6 publications

References 22 publications

Hydrodynamic and mass transfer correlations for SiC ceramic foam monolithic trays used in distillation column

Hydrodynamic and mass transfer correlations for SiC ceramic foam monolithic trays used in distillation column

Direct Tray and Point Efficiency Measurements Including Weeping Effects through a Convenient Add-On for Air–Water Simulators

Research trends in sieve trays and distillation and adsorbtion equipments

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