Double-partitioned dividing wall column for a multicomponent azeotropic system

Aurangzeb, .; Jana, Amiya K.

doi:10.1016/j.seppur.2019.03.007

Cited by 32 publications

(22 citation statements)

References 23 publications

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“…13 These designs include traditional EDWCs, 11,13,23,29,34,36−46 ledge wall, 10,12,17,24,28,33,35,36,47−54 middle wall, 1,2,7,15,19,55−58 and double dividing walls. 10,59 The designs may also incorporate heat assistance such as intermediate heating and heat pumps. 43,55−58 It is possible to couple an EDWC with another column or a decanter depending on the system.…”

Section: Designs Of Edwcmentioning

confidence: 99%

Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

Czarnecki

Owens

Eldridge

2023

Ind. Eng. Chem. Res.

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Extractive distillation (ED) can be combined with divided wall column (DWC) schemes to separate azeotropic mixtures within one column shell. Traditional extractive divided wall columns (EDWCs) have the dividing wall placed at the top of the column, eliminating the common rectifying section. This review covers the design schemes, entrainer selection process, simulation design methods, and control schemes for EDWCs. There is an emphasis on the 33 azeotropic systems that have been separated using EDWCs. Successful case studies and ongoing research challenges are highlighted in the review. As with switching from conventional distillation schemes to a DWC, the motivation to use EDWCs over ED is economic savings and environmental benefits.

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Section: Designs Of Edwcmentioning

confidence: 99%

Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

Czarnecki

Owens

Eldridge

2023

Ind. Eng. Chem. Res.

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“…As ethanol and water form an azeotrope, the diluted bioethanol is separated through a three-column process including the pre-concentration column followed by a double-column ED process (EDC + SRC). As this process is energy-intensive, many researchers have attempted to reduce its high energy consumption using the EDWC [3,7,13,23,35]. While most work generated the EDWC through a simple combination of the EDC column and the SRC column, Kiss and Ignat [22] proposed an innovative EDWC that combined the three columns together as illustrated in Fig.…”

Section: Case Study 2: Bioethanol Purificationmentioning

confidence: 99%

Optimal design of extractive dividing-wall column using an efficient equation-oriented approach

Zhang

et al. 2020

Front. Chem. Sci. Eng.

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The extractive dividing-wall column (EDWC) is one of the most efficient technologies for separation of azeotropic or close boiling-point mixtures, but its design is fairly challenging. In this paper we extend the hybrid feasible path optimisation algorithm (Ma Y, McLaughlan M, Zhang N, Li J. Computers & Chemical Engineering, 2020, 143: 107058) for such optimal design. The tolerances-relaxation integration method is refined to allow for long enough integration time that can ensure the solution of the pseudo-transient continuation simulation close to the steady state before the required tolerance is used. To ensure the gradient and Jacobian information available for optimisation, we allow a relaxed tolerance for the simulation in the sensitivity analysis mode when the simulation diverges under small tolerance. In addition, valid lower bounds on purity of the recycled entrainer and the vapour flow rate in column sections are imposed to improve computational efficiency. The computational results demonstrate that the extended hybrid algorithm can achieve better design of the EDWC compared to those in literature. The energy consumption can be reduced by more than 20% compared with existing literature report. In addition, the optimal design of the heat pump assisted EDWC is achieved using the improved hybrid algorithm for the first time.

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“…Separation processes of water-containing ternary mixtures are widely investigated in the literature because the separation method can vary significantly according to the thermodynamic characteristics among the three components. Common methods of separating water-containing ternary azeotropes include extractive distillation (ED), − pressure swing distillation (PSD), − heterogeneous azeotropic distillation (HAD), ,, extraction and distillation, , and membrane distillation (MD). − Based on these typical methods, intensified processes implementing thermal coupling, − side-stream coupling, , or dividing-wall column − in the system have been studied to further reduce the energy consumption in distillation columns.…”

Section: Introductionmentioning

confidence: 99%

Novel Process Development of Hybrid Reactive–Extractive Distillation System for the Separation of a Cyclohexane/Isopropanol/Water Mixture with Different Feed Compositions

Hua

Kuo

et al. 2022

Ind. Eng. Chem. Res.

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A cyclohexane (CY)/isopropanol (IPA)/water mixture has complex thermodynamic properties with three binary azeotropes and one ternary azeotrope. A configuration of doublecolumn reactive−extractive distillation (DCRED) is suitable to be used for the separation of this mixture with ethylene oxide (EO) as the dehydrating agent. Taking advantage of a large liquid−liquid envelope in the ternary map of this mixture, two novel process configurations are proposed in this study to separate the mixture with the percentage of water to total feed ranging from 10 to 90 mol %. A process configuration that includes a pretreatment section followed by a DCRED section (P-DCRED) was proven to be efficient in separating the mixture with the percentage of water ranging from 50 to 90 mol %, while only the DCRED process configuration showed its superiority when dealing with the mixture with the percentage of water ranging from 10 to 40 mol %. Compared to the traditional extractive distillation (ED) and another process of ED coupled with pervaporation (PV) in the recent literature, the novel processes proposed in this study can save a total annual cost (TAC) of 20 to 80%.

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Double-partitioned dividing wall column for a multicomponent azeotropic system

Cited by 32 publications

References 23 publications

Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

Extractive Dividing Wall Column for Separating Azeotropic Systems: A Review

Optimal design of extractive dividing-wall column using an efficient equation-oriented approach

Novel Process Development of Hybrid Reactive–Extractive Distillation System for the Separation of a Cyclohexane/Isopropanol/Water Mixture with Different Feed Compositions

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