Experimental study on pressure drops in a dividing wall distillation column

Barroso-Muñoz, Fabricio Omar; Hernández, Salvador; Hernández‐Escoto, Héctor; Segovia‐Hernández, Juan Gabriel; Rico-Ramı́rez, Vicente; Chavez, Rosa-Hilda

doi:10.1016/j.cep.2010.01.002

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…On the contrary, the middle section is characterized by a wall placed inside the main shell, which plays an important role in the operation of the DWDC [16]. Many practical implementation problems need to be addressed.…”

Section: The Energy-efficient Design Of the Dwdcmentioning

confidence: 99%

Implementation and Operation of a Dividing‐Wall Distillation Column

et al. 2011

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The design and construction of a prototype of a dividing-wall distillation column was possible by integrating previous knowledge in process intensification, energy savings, theoretical control properties, and closed-loop dynamics of thermally coupled distillation sequences. In order to achieve the predicted energy savings for this class of complex distillation column, a dividing wall and a side tank were implemented in order to manipulate the internal flows associated with energy consumption. The reaction between ethanol and acetic acid was conducted within the prototype, and the experimental results indicate that a heterogeneous mixture of ethyl acetate and water is obtained as the top product. The temperature profile measured during the experimental run can be used for controlling the batch distillation column in cyclic operation mode.

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Section: The Energy-efficient Design Of the Dwdcmentioning

confidence: 99%

Implementation and Operation of a Dividing‐Wall Distillation Column

et al. 2011

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“…The DWCs have frequently been applied to the separation of various systems including hydrocarbons, alcohols, aldehydes, ketones, amines, and other kinds of mixtures. − Furthermore, DWCs can also be extended to azeotropic, extractive, and reactive distillation without any major changes to the types of internal configurations. , Despite the fact that DWC technology promises a significant reduction in both operation and investment costs compared to conventional two column systems, − its application is still rare in real industry due to the complexity in their design and simulation …”

Section: Introductionmentioning

confidence: 99%

An Improved Shortcut Design Method of Divided Wall Columns Exemplified by a Liquefied Petroleum Gas Process

Seihoub

Benyounes

Shen

et al. 2017

Ind. Eng. Chem. Res.

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Designing a sustainable and economical distillation system is a big global challenge in the industrial chemical field. To address this issue, one of most promising solutions is the so-called dividing wall columns addressed in this work, which not only can cut energy cost but also use limited installation space. An improved shortcut design approach is developed in this work to provide accurate models for each section of dividing wall columns; meanwhile Underwood’s and Gilliland’s equations are employed to determine minimum reflux ratio and total number of stages in different column sections in terms of corresponding design specifications and operating conditions. This proposed approach has been applied to separations of mixtures of hydrocarbons and alcohol with different values on the ease of separation index. To test its effectiveness, the preliminary design parameters obtained through the improved proposed shortcut method are further validated by a rigorous simulation in Aspen HYSYS. Furthermore, the results indicate that this method could provide much more accuracy of average interconnecting stream composition of the prefractionator and main column than those of other methods. In practice, this method has been applied to a case of liquefied petroleum gas (LPG) separation with three targeted products in an industrial liquefied petroleum gas plant. The applications and efficiency of the shortcut method in this study lay a theoretical foundation for designing the separation of ideal mixtures involving dividing wall columns.

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“…Despite the fact that dividing-wall columns (DWCs) are known to have around 30% or even higher degree of reduction in capital investment and utility requirements as compared with conventional direct and indirect distillation sequences in the separation of ternary mixtures, they have not yet found wide application in the chemical and petrochemical process industries. − The major reason lies essentially in the lack of insights into process dynamics and controllability and reliable methods for the synthesis and design of decentralized control systems. − Recently, increasingly more efforts have been seen in these aspects and relatively more papers have been published on the dynamics and operation of the DWC. − In 1995, Wolff and Skogestad proposed, for the first time, two kinds of direct composition control schemes for the DWC . One involved three control loops controlling the purities of the three products, respectively, with the reflux flow rate, intermediate product flow rate, and vapor boilup rate as manipulated variables.…”

Section: Introductionmentioning

confidence: 99%

Operation of Dividing-Wall Columns. 1. A Simplified Temperature Difference Control Scheme

Luan

Huang

2013

Ind. Eng. Chem. Res.

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A simplified temperature difference control (STDC) scheme, consisting of two temperature and two temperature difference control loops, is proposed for the operation of dividing-wall columns (DWCs). The two temperature control loops are located, respectively, in the rectifying and stripping sections of the main distillation column and work to maintain the top and bottom product qualities. The two temperature difference control loops are arranged, respectively, in each side of the dividing wall with their temperature measurements arranged above and below the locations for introducing feed to the prefractionator and for withdrawing the intermediate product from the main distillation column. These special arrangements serve to keep a certain degree of separation of the fed mixture in the prefractionator and the purity of the intermediate product, tightening product quality control and rendering the STDC scheme with high robustness to the changes in the thermodynamic properties of the ternary mixtures separated. Separation of three ideal ternary mixtures of hypothetical components, A, B, and C, with different ease of separation indexes (ESIs) is chosen as illustrative examples to evaluate the proposed STDC scheme and thorough comparison is conducted with the currently available temperature control (TC) and temperature difference control (TDC) schemes. It is found that the STDC scheme is much superior to the TC scheme irrespective of the great changes in the ESIs. Although with relatively lower instrumentation cost and smaller engineering effort, it can generally lead to performance comparable with the TDC scheme. Application of the STDC scheme to the DWC separating a ternary mixture of ethanol, propanol, and butanol is also attempted and similar outcomes are obtained. Since the STDC scheme behaves in good accordance with the working principle of the DWC, it should be viewed as a general and effective strategy for the operation of the DWC.

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Experimental study on pressure drops in a dividing wall distillation column

Cited by 9 publications

References 19 publications

Implementation and Operation of a Dividing‐Wall Distillation Column

Implementation and Operation of a Dividing‐Wall Distillation Column

An Improved Shortcut Design Method of Divided Wall Columns Exemplified by a Liquefied Petroleum Gas Process

Operation of Dividing-Wall Columns. 1. A Simplified Temperature Difference Control Scheme

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