Industrial application of an extended fully thermally coupled distillation column to BTX separation in a naphtha reforming plant

Kim, Young Han; Choi, Dae Woong; Hwang, Kyu-Suk

doi:10.1007/bf02706919

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…[6]. The total number of trays and column pressure were set to those in the conventional system, which simplified the design process using the commercial design program.…”

Section: Design Resultsmentioning

confidence: 99%

“…This limitation raises the utility costs of the coolant and steam used in the heat exchangers of the DWC. In-tray heat exchangers reduce the requirement of high-cost utility in the DWC using diabatic operation [6,24,25]. The illustration given in Fig.…”

Section: Process Designmentioning

confidence: 99%

“…For the performance evaluation of the proposed DWC, two example processes of the previous studies [6,23] are utilized here. The column pressure and total number of trays are adopted from the studies, of which the detail is explained in the next section.…”

Section: Process Designmentioning

confidence: 99%

“…Two practical processes employed in the previous studies [6,23] are used to examine the performance of the proposed side-column DWCs. The first one is a BTX process containing 18 components to be separated into four groups of products: benzene, toluene, xylene and C 9þ products.…”

Section: Example Processesmentioning

confidence: 99%

“…The successful implementation of the DWCs in industrial applications proves the high thermodynamic efficiency of the DWCs [3,4]. Likewise the extended Petlyuk column [5,6], theoretically identical to the extended DWC [7], is employed in the four-component separation, in which three distillation columns are conventionally used. The distribution of liquid composition in trays of the extended Petlyuk column is close to the residue curve of total reflux operation, where the energy demand is minimal [5,8].…”

Section: Introductionmentioning

confidence: 99%

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Energy saving of side-column DWCs for quaternary separation

Kim

2015

Energy

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“…[6]. The total number of trays and column pressure were set to those in the conventional system, which simplified the design process using the commercial design program.…”

Section: Design Resultsmentioning

confidence: 99%

Section: Process Designmentioning

confidence: 99%

Section: Process Designmentioning

confidence: 99%

Section: Example Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy saving of side-column DWCs for quaternary separation

Kim

2015

Energy

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Energy Savings in the Benzene‐Toluene‐Xylene Separation Process Using an Extended Divided‐Wall Column

Kim

2016

Chem Eng & Technol

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Benzene-toluene-xylene (BTX) separation is one of the processes consuming large amounts of energy in the petrochemical industry. A new BTX separation process utilizing an extended divided-wall column is proposed. Its performance with regard to energy savings and cost reduction was examined in comparison with that of the conventional BTX separation process. The energy saving of the proposed process resulted largely from the reduction of the processing load in the extraction process, which consumes large amounts of energy and high-cost steam. The design results of the proposed system indicated that 35.8 % of the heating duty and 32.2 % of the cooling duty were saved compared to the heat duty in the conventional process. While the investment cost of the proposed system increased by 12.6 %, the utility cost was reduced by 33.9 %. The increased investment cost can be returned by 7.5 months of operation due to utility cost reduction.

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Energy‐efficient complex distillation sequences: Control properties

et al. 2008

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Four thermally coupled distillation systems were designed for the separation of five-component mixtures (the light-ends separation section of a crude distillation plant); their steady-state design was obtained by starting from a conventional distillation sequence and then optimizing for minimum energy consumption. The thermally coupled distillation systems were compared to sequence based on conventional columns design. Comparison was based on controllability properties under open and closed loop operation, following the dynamic behaviour after common industrial operating disturbances. Simulation results were analyzed by the singular value decomposition technique and with the performance examination of elimination of feed disturbances using PI controllers. It was found that thermally coupled distillation systems are controllable and, sometimes, they exhibit dynamic responses that are easier to manage than in the case of conventional distillation sequences; this result is innovative in the study of this kind of systems.Quatre systèmes de distillation couplés thermiquement ontété conçus pour la séparation de mélangesà cinq composantes (la section de séparation de légers d'une installation de distillation de brut); leur conception en régime permanent aété obtenue en débutant par une séquence de distillation conventionnelle qui a ensuiteété optimisée quantà la consommation d'énergie minimale. Ces systèmes de distillation couplés thermiquement ontété comparésà une séquence basée sur la conception de colonne conventionnelle. La comparaison s'appuie sur les propriétés de contrôlabilité pour un fonctionnement en boucle ouverte et fermée, en suivant le comportement dynamiqueà la suite de perturbations opératoires industrielles communes. Les résultats de simulation sont analysés par la technique de décomposition des valeurs singulières et l'examen des performances pouréliminer des perturbations sur l'alimentationà l'aide de contrôleurs PI. On a trouvé que les systèmes de distillation couplés thermiquement sont contrôlables, et parfois, ceux-ci montrent des réponses dynamiques qui sont plus facilesà gérer que dans le cas des séquences de distillation conventionnelles; c'est un résultat novateur dans l'étude de ce type de systèmes.

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Industrial application of an extended fully thermally coupled distillation column to BTX separation in a naphtha reforming plant

Cited by 18 publications

References 12 publications

Energy saving of side-column DWCs for quaternary separation

Energy saving of side-column DWCs for quaternary separation

Energy Savings in the Benzene‐Toluene‐Xylene Separation Process Using an Extended Divided‐Wall Column

Energy‐efficient complex distillation sequences: Control properties

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