Assessment of separation efficiency modeling and visualization approaches pertaining to flow and mixing patterns on distillation trays

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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“…Using eqs and and considering linear vapor/liquid equilibrium, the tray-to-point efficiency ratio , can be derived as …”

Section: Proposed Efficiency Calculation Approachesmentioning

confidence: 99%

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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“…For modelling and improvement of column tray efficiency, knowledge about the two‐phase flow including distribution of holdup, clear liquid height and residence time on industrial‐scale cross‐flow trays is required . For this purpose, researchers at Helmholtz‐Zentrum Dresden‐Rossendorf developed a novel conductivity‐based sensor array for flow studies (Fig.…”

Section: Experimental Techniques For Large Columns Trays and Feed Pmentioning

confidence: 99%

Recent Advances in Experimental Techniques for Flow and Mass Transfer Analyses in Thermal Separation Systems

Hampel

Schubert

Döß

et al. 2020

Chemie Ingenieur Technik

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Modelling flow and mass transfer of thermal separation equipment constitutes one of the most challenging tasks in fluids process engineering. The difficulty of this task comes from the multiscale multiphase flow phenomena in rather complex geometries. Both analysis of flow and mass transfer on different scales as well as validation of models and simulation results require advanced experimental and measurement techniques. As a follow-up to intensive discussions during the 2019 Tutzing Symposium ''Separation Units 4.0'' a wide set of available modern experimental technologies is presented.

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“…under-dimension the column and the desired separation is not achieved with the calculated number of equilibrium trays 41 .…”

Section: Accepted Articlementioning

confidence: 99%

A mass and energy balance stage model for cyclic distillation

et al. 2020

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Assessment of separation efficiency modeling and visualization approaches pertaining to flow and mixing patterns on distillation trays

Cited by 19 publications

References 80 publications

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

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

Recent Advances in Experimental Techniques for Flow and Mass Transfer Analyses in Thermal Separation Systems

A mass and energy balance stage model for cyclic distillation

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