Dividing-wall columns: Design and control of a kaibel and a satellite distillation column for BTX separation

Tututi-Ávila, Salvador; Domínguez-Díaz, Luis A.; Medina-Herrera, Nancy; Jiménez‐Gutiérrez, Arturo; Hahn, Juergen

doi:10.1016/j.cep.2017.01.010

Cited by 46 publications

(15 citation statements)

References 27 publications

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“…Almost all of the above-mentioned applications are for ternary separation. To further improve energy efficiency of the multiproduct distillation system, four-product dividing wall columns (FPDWCs) have been proposed and designed to separate feed into four products in one column with single or multiple partition walls, which has received attention in both industrial and academic research. − …”

Section: Introductionmentioning

confidence: 99%

Easy-to-Operate and Energy-Efficient Four-Product Dividing Wall Columns with Two Partition Walls

Liu

liu

et al. 2020

Ind. Eng. Chem. Res.

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Four-product dividing wall columns (FPDWCs) are considered as more energy-efficient than the conventional column sequence for multiproduct separation. The FPDWCs with two partition walls have the superiority of a simpler internal structure without an energy penalty under certain restrictions with respect to the dominating split, as compared with the complex Sargent configuration. Nevertheless, their industrial applications are still constrained by uncontrollable vapor splits. To handle these obstacles, the bidirectional vapor−liquid thermal coupling streams between column sections were converted to liquid-only transfer streams to obtain new variants in the present work. These synthesized configurations are characterized by no uncontrollable vapor split and are encouraging for industrial implementation. Elaborate analyses indicate that these derivatives are thermodynamically equivalent to the original ones under the minimum vapor flow condition. Further functional equivalence between the easy-to-operate arrangements and the configurations with uncontrollable vapor splits was validated in practical situations, with the aid of the sequential optimization method. Besides, considering alternative terminating points for each partition wall, all of the new easy-to-operate variants were enumerated. Finally, we expand the search space of FPDWCs with two partition walls by extending the strategy to supplementary thermally coupled configurations applicable to the separation task with various dominating splits, which provide multiple options for practitioners to implement. By employing these new configurations, the energy consumption of the multiproduct distillation system could be substantially mitigated and the operational uncertainty associated with uncontrollable vapor splits could be eliminated.

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Section: Introductionmentioning

confidence: 99%

Easy-to-Operate and Energy-Efficient Four-Product Dividing Wall Columns with Two Partition Walls

Liu

liu

et al. 2020

Ind. Eng. Chem. Res.

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“…Tututi‐Avila et al studied the design and control of a satellite column (extended dividing wall distillation column), and its comparison to the performance of a Kaibel dividing wall column and to a traditional distillation process sequence. [ 14 ] Wang et al presented design of the four product dividing wall column (FPDWC) and investigated the effect of the vapour split ratio on the energy penalty, under feed composition disturbance. [ 15 ] In addition, Van Duc Long and Lee performed an optimum DWC structure by employing response surface methodology (RSM) on DWC design and optimization.…”

Section: Introductionmentioning

confidence: 99%

Optimization and control of vertical double wall dividing‐wall column for separating a quaternary system

Wang

Zhou

et al. 2020

Can J Chem Eng

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In this paper, the new separation structure (VDWDWC) for separation of a quaternary system is proposed for the first time, which has lower energy consumption and higher separation efficiency than the traditional three‐column and Kaibel column. Sensitivity analysis and response surface optimization (RSM) are applied to the structural design and parameter optimization of VDWDWC. In addition, the dynamic control of VDWDWC is also investigated. Specifically, the performances of temperature‐composition cascade control (TC‐CC) with and without feed‐forward ratio control are compared and analyzed. The results suggested that the TC‐CC structure can achieve outstanding controllability for VDWDWC, when the feed flow rate and feed composition is disturbed. In particular, TC‐CC with feed‐forward ratio control has better dynamic response: the maximum deviation was reduced by 53.7%, and the settling times are significantly shortened, while the steady state deviation of product purity was slightly reduced.

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“…As a special sort of DWDCs separating quaternary mixtures, Kaibel distillation columns (c.f., Figure 1b) can reduce equipment investment and operation cost by about 40%, respectively, with reference to conventional direct, indirect and discrete distillation sequences. Moreover, the Kaibel distillation column has the simplest topological structure in all four-component DWDCs, so it is most likely to be applied in industry and deserves to be deeply studied [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Closed-loop evaluation results showed that the first temperature control structure could not guarantee the stable run of the Kaibel distillation column after facing various disturbances but the other two control structures could, which demonstrated the necessity of adding a prefractionator temperature control loop. To fractionate a benzene/toluene/xylene/heavies quaternary mixture, Tututi-Avila et al developed a Kaibel distillation column using a genetic algorithm and demonstrated its capability in energy saving [8]. Furthermore, they gave a composition control structure including five composition control loops to control the developed Kaibel distillation column.…”

Section: Introductionmentioning

confidence: 99%

Comparing Composition Control Structures for Kaibel Distillation Columns

et al. 2020

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Although Kaibel distillation columns are superior to conventional distillation sequences owing to smaller equipment investment and operation cost, they display high nonlinearity and this greatly increases the difficulty of achieving their tight control. To overcome this problem, four decentralized composition control structures, i.e., the CSR/QR, CSR/B, CSD/QR, and CSD/B structures, are proposed and compared based on the control of a Kaibel distillation column fractionating a methanol/ethanol/propanol/butanol quaternary mixture. These four composition control structures all include five composition control loops. While the four of them are employed to maintain the purity of the top, upper sidestream, lower sidestream, and bottom products, the remaining one is employed to minimize the energy consumption of the Kaibel distillation column by maintaining the composition of propanol at the first stage of the prefractionator. Dynamic simulation results show the CSR/QR and CSR/B structures can tightly maintain the purity of the controlled products with a small overshoot and short settling time after facing various disturbances in feed conditions, but the CSD/QR and CSD/B structures lead to oscillatory responses (the latter even shows divergent responses under individual disturbances). At the end of the article, some effective guides for developing composition control systems are given.

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Dividing-wall columns: Design and control of a kaibel and a satellite distillation column for BTX separation

Cited by 46 publications

References 27 publications

Easy-to-Operate and Energy-Efficient Four-Product Dividing Wall Columns with Two Partition Walls

Easy-to-Operate and Energy-Efficient Four-Product Dividing Wall Columns with Two Partition Walls

Optimization and control of vertical double wall dividing‐wall column for separating a quaternary system

Comparing Composition Control Structures for Kaibel Distillation Columns

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