A mass and energy balance stage model for cyclic distillation

Rasmussen, Jess Bjørn; Mansouri, Seyed Soheil; Zhang, Xiangping; Abildskov, Jens; Huusom, Jakob Kjøbsted

doi:10.1002/aic.16259

Cited by 13 publications

(11 citation statements)

References 35 publications

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“…Thus, developing a novel approach for the design of a distillation unit leading to reduced energy demand of the system has great scope. Integration of process design and control has been carried out on various intensified distillation units such as cyclic distillation 5‐7 and reactive distillation 8‐10 . In some cases, the integration of process design and control has been led to a tool 11,12 that solves problems addressing integrated process design and control.…”

Section: Introductionmentioning

confidence: 99%

Molecular tracking: A concept for side‐draw distillation column design

et al. 2020

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A simple approach is introduced to locate a side‐draw tray for ternary and multi‐component mixtures with middle boiling component(s) present in the system at trace levels. The concept is based on a probability function defined by the thermodynamic properties of the system. The advantage of this method over existing methods is the ability to quickly and efficiently provide a feasible configuration of the distillation unit without relying on rigorous optimization or trial and error approaches. Moreover, it provides an intuitive understanding of the movements of the middle boiling components in the column.

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Section: Introductionmentioning

confidence: 99%

Molecular tracking: A concept for side‐draw distillation column design

et al. 2020

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“…Because commercial simulators do not support cyclic distillation, , calculations were done with a spreadsheet using the constant latent heat method. , Instead of assuming that total molar vapor and liquid flow rates are constant, the constant latent heat method defines a latent heat unit that makes the latent heat of vaporization of the two components equal. The following assumptions are made: latent heats are constant, sensible heat changes are negligible, and the column is adiabatic.…”

Section: Process Simulationsmentioning

confidence: 99%

“…Following the development of the Higee process, process intensification in distillation has drawn considerable attention . This interest in process intensification has revived interest in cyclic distillation. − Although first developed in 1961 by Cannon and his co-workers, , the process hibernated for a number of years because operating methods with more than a few stages were not reliable. However, reliable operating methods are now available. − The cyclic distillation mode of operation leads to increased column efficiency that is evident from either more separation with the same number of stages or fewer stages for the same separation. − In addition, energy consumption can be reduced.…”

Section: Introductionmentioning

confidence: 99%

“…A mass balance model was developed that calculated a vapor flow rate for each stage based on the latent heat of vaporization . A detailed mass and energy balance model for cyclic distillation was very recently published . This model solves the time-dependent MESH equations for all trays simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…11 A detailed mass and energy balance model for cyclic distillation was very recently published. 12 This model solves the time-dependent MESH equations for all trays simultaneously. Results illustrated that changes in the vapor flow rate can have significant effects on the separation.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Operation of Flash and Column Flash Distillation

Fazlollahi

Wankat

2020

Ind. Eng. Chem. Res.

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Cyclic distillation can increase the column efficiency that is evident from either more separation with the same number of stages or fewer stages for the same separation. Cyclic flash distillation, the single stage limit of cyclic distillation without reflux, is batch distillation with repeated charges of feed. Continuous flash distillation is normally a single stage separation technique, but one variant, column flash distillation, has multiple stages. Column flash distillation is not a common separation process, but it is used commercially during partial condensation of hydrocarbon gas mixtures. In traditional batch distillation, the still pot is heated, and some of the batch is boiled away. A second batch operating method first loads the still pot with liquid feed, and then, vapor feed is added. A third method combines the previous two methods. Although traditional simple batch distillation requires significantly less energy than continuous flash distillation, batch distillation is rarely employed because it is believed that it is difficult to interface batch operations with the continuous processes in continuous plants. In this paper, binary separations by the following systems are compared: batch distillation, conventional flash distillation, continuous column flash distillation, and cyclic column flash distillation. The results show significant improvement when batch distillation or continuous column flash distillation replaces continuous conventional flash distillation and very modest improvement when cyclic column flash distillation replaces continuous column flash distillation.

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Conceptual methods for synthesis of reactive distillation processes: recent developments and perspectives

Kiss,

Muthia,

Pazmiño‐Mayorga

et al. 2024

J of Chemical Tech & Biotech

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Reactive distillation (RD) is a process intensification technique that offers major advantages over conventional technologies by enabling the integration of reaction and separation into a single apparatus. This integration introduces and exploits complex interaction between mass transfer, chemical reaction and hydrodynamics within an RD column; however, these complexities can hinder the adoption of reactive distillation by industry.Many approaches were developed by the scientific community to advance understanding and to expedite the initialization of RD design at the conceptual level. This paper critically discusses recent developments in conceptual methods for synthesizing RD processes. This review paper is the first to consider the range of available approaches for assessing the technical feasibility, controllability, economic viability, and sustainability, of RD units by taking into account various configurations in which RD is treated as a new unit operation, and as part of process synthesis in a different way of designing processes based on functions. The review also addresses complex configurations, such as advanced RD technologies. Special attention is paid to process modeling and simulation as well as to education. Knowledge gaps to be filled by further research are indicated.This article is protected by copyright. All rights reserved.

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A mass and energy balance stage model for cyclic distillation

Cited by 13 publications

References 35 publications

Molecular tracking: A concept for side‐draw distillation column design

Molecular tracking: A concept for side‐draw distillation column design

Cyclic Operation of Flash and Column Flash Distillation

Conceptual methods for synthesis of reactive distillation processes: recent developments and perspectives

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