Cyclic distillation – Design, control and applications

Pătruţ, Cătălin; Bîldea, Costin Sorin; Liţă, Ionela; Kiss, Anton A.

doi:10.1016/j.seppur.2014.02.006

Cited by 31 publications

(38 citation statements)

References 31 publications

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“…Controlled cycling consists of a repeating sequence of a vapor‐flow period (VFP), when the liquid flow is interrupted, followed by a liquid‐flow period (LFP), when the liquid simultaneously drains down the column, moving from each tray to the tray below (ideally without mixing) – as shown in Fig. . With this type of operation, no downcomers are needed hence the plates are simpler, cheaper and more flexible.…”

Section: Cyclic Operation Modesmentioning

confidence: 99%

“…The solution method involves successive applications of the vapor and liquid equations in an iterative procedure (direct substitution), until the initial condition and the final state coincide – as illustrated in Fig. . The convergence can be accelerated by using algorithms suitable for solving non‐linear equations, such as Newton or Broyden.…”

Section: Simulation Modelsmentioning

confidence: 99%

“…The feed stage is then selected as the tray where the difference between the liquid concentration and the feed stream is the smallest. This approach can be seen as the method of steps for solving a delay‐differential equations model, as described by Pătruţ et al Comparing the results obtained using the non‐linear and linear design model, the authors concluded that the assumptions used for deriving the linear model are not valid. Thus, the number of trays necessary to perform the separation of an equimolar benzene–toluene mixture into 95% pure product is 8 for periodic operation and 16 for conventional operation, while the linear model of Rivas predicted 5.3 stages …”

Section: Design Algorithmsmentioning

confidence: 99%

“…1. 3 With this type of operation, no downcomers are needed hence the plates are simpler, cheaper and more flexible. In the classical realization of Cannon and co-workers, 4 the time for each period is imposed using a timer which controls the valve in the vapor line connecting the reboiler to the distillation tower.…”

Section: Cyclic Operation Modesmentioning

confidence: 99%

“…6. 3,32 The convergence can be accelerated by using algorithms suitable for solving non-linear equations, such as Newton or Broyden. Alternatively, one can view the model of cyclic distillation as a boundary value problem, where the differential equations and (the non-separated) boundary conditions are given by vapor-and liquid-phase models, respectively.…”

Section: Non-linear Modelsmentioning

confidence: 99%

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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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Section: Cyclic Operation Modesmentioning

confidence: 99%

Section: Simulation Modelsmentioning

confidence: 99%

Section: Design Algorithmsmentioning

confidence: 99%

Section: Cyclic Operation Modesmentioning

confidence: 99%

Section: Non-linear Modelsmentioning

confidence: 99%

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Cyclic distillation technology - a mini-review

Bîldea

Pătruţ

Jørgensen

et al. 2016

J. Chem. Technol. Biotechnol.

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Pilot‐scale studies of process intensification by cyclic distillation

Maleta¹,

Shevchenko

Bedryk

et al. 2015

AIChE Journal

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Process intensification in distillation systems receives much attention with the aim of increasing both energy and separation efficiency. Several technologies have been investigated and developed, as for example: dividing‐wall column, HiGee distillation, or internal heat‐integrated distillation. Cyclic distillation is a different method based on separate phase movement—achievable with specific internals and a periodic operation mode—that leads to key advantages: increased column throughput, reduced energy requirements, and better separation performance. This article is the first to report the performance of a pilot‐scale distillation column for ethanol‐water separation, operated in a cyclic mode. A comparative study is made between a pilot‐scale cyclic distillation column and an existing industrial beer column used to concentrate ethanol. Using specially designed trays that truly allow separate phase movement, the practical operation confirmed that 2.6 times fewer trays and energy savings of about 30% are possible as compared with classic distillation. © 2015 American Institute of Chemical Engineers AIChE J, 61: 2581–2591, 2015

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A mass and energy balance stage model for cyclic distillation

et al. 2020

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Cyclic distillation – Design, control and applications

Cited by 31 publications

References 31 publications

Cyclic distillation technology - a mini-review

Cyclic distillation technology - a mini-review

Pilot‐scale studies of process intensification by cyclic distillation

A mass and energy balance stage model for cyclic distillation

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