Identification of Periodic Cycled Distillation for Control Purposes

Toftegård, B.; Jørgensen, Sten Bay

doi:10.1016/b978-0-08-034917-6.50038-6

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…24 No realization of Lewis Case 2 was therefore made, before periodic operation appeared. 25 Therefore, the limiting behavior (β → 1) of meta columns, is a column that appears to operate similarly in the case of meta-and conventional separation. The limiting behavior (β → 1) in the case of para separation, is a column that appears to operate quite differently, i.e.…”

Section: ■ Modelingmentioning

confidence: 99%

Modeling Tray Separation Columns with Parallel Streams

Lyregaard

Jørgensen

Abildskov

2023

Ind. Eng. Chem. Res.

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Linear tray models based on liquid phase plug flow, are developed for absorption and desorption using conventional-, para-, and meta separation columns. The models are explicit in the local (point) efficiency rather than tray efficiency, leading to direct integration of the Lewis enhancement effects, i.e. of point-to-plate efficiency enhancement. The models lead to mathematical systems, also encountered in modeling and analysis of periodic separations. With similar analysis, the models can evaluate stationary profiles and tray efficiencies of systems with arbitrary numbers of trays and parallel streams. The models are used to simulate stripping/desorption of ammonia from water with air and absorption of SO2 with seawater. The presented framework of modeling and analysis makes it possible to develop a basis for comparing different separation forms on a common basis. Periodic separation and conventional tray-based separation are special cases of para separation and meta separation without stream partitioning. Similarly, para separation and meta separation can be seen as extensions of periodic and conventional separation to higher numbers of parallel streams.

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Section: ■ Modelingmentioning

confidence: 99%

Modeling Tray Separation Columns with Parallel Streams

Lyregaard

Jørgensen

Abildskov

2023

Ind. Eng. Chem. Res.

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“…However to design a MIMO controller it is necessary to have an adequate model of the process dynamics. Toftegård and Jørgensen published preliminary studies on identification and control of a periodic cycled distillation column with nine trays for separation of benzene/toluene . They aimed at a multi‐variable adaptive multi‐input single‐output controller.…”

Section: Control Of Cyclic Distillation Columnsmentioning

confidence: 99%

“…Toftegård and Jørgensen published preliminary studies on identification and control of a periodic cycled distillation column with nine trays for separation of benzene/toluene. 40 They aimed at a multi-variable adaptive multi-input single-output controller. The controller uses the vapor-flow period length as controller output to control distillate composition.…”

Section: Control Of Cyclic Distillation Columnsmentioning

confidence: 99%

Cyclic distillation technology - a mini-review

Bîldea

Pătruţ

Jørgensen

et al. 2016

J. Chem. Technol. Biotechnol.

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Process intensification in distillation systems has received much attention during the past decades, with the aim of increasing both energy and separation efficiency. Various techniques, such as internal heat-integrated distillation, membrane distillation, rotating packed bed, dividing-wall columns and reactive distillation were studied and reported in literature.All these techniques employ the conventional continuous counter-current contact of vapor and liquid phases. Cyclic distillation technology is based on an alternative operating mode using separate phase movement which leads to key practical advantages in both chemical and biochemical processes. This article provides a mini-review of cyclic distillation technology.The topics covered include the working principle, design and control methods, main benefits and limitations as well as current industrial applications. Cyclic distillation can be rather easily implemented in existing columns by simply changing the internals and the operating mode, thus bringing new life in old distillation towers by significantly increasing the column throughput, reducing the energy requirements and offering a better separation performance.

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Identification of Periodic Cycled Distillation for Control Purposes

Cited by 2 publications

References 3 publications

Modeling Tray Separation Columns with Parallel Streams

Modeling Tray Separation Columns with Parallel Streams

Cyclic distillation technology - a mini-review

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