Synthesis and design of reactive distillation columns with two reactive sections

Zhang, Liang; Chen, Haisheng; Yuan, Yang; Yu, Jieping; Wang, Shaofeng; Huang, Kejin

doi:10.1016/j.cherd.2015.05.034

Cited by 12 publications

(8 citation statements)

References 19 publications

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“…In recent years, several articles addressed internal energy/ heat integration and internal mass integration in different distillation systems including RD, targeting moderate to large energy savings [35][36][37][38][39][40][41][42][43]. The design of efficient and easily implementable control structures for such energy-efficient distillation systems is significant for the effective realization of heat energy savings [44].…”

Section: Introductionmentioning

confidence: 99%

Control of Quaternary Ideal Endothermic Reactive Distillation with and without Internal Heat Integration

2016

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Decentralized control system design is evaluated for a basic and an internally heat-integrated generic, ideal, double-feed, two-product reactive distillation system. The internally heat-integrated reactive distillation column (HiRDC) is obtained via catalyst redistribution into the rectifying zone and feed tray relocation. For basic regulatory control, three two-point control structures with a fixed reflux rate or a fixed reflux ratio operation policy are synthesized and evaluated for their closed-loop disturbance rejection characteristics using rigorous dynamic simulations. To eliminate the purity offsets for on-target product purities, product purity composition controllers manipulating the reflux ratio and stripping tray temperature set point are implemented. Reactive tray section composition control is necessary for on-target product purity operation of HiRDC.

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Section: Introductionmentioning

confidence: 99%

Control of Quaternary Ideal Endothermic Reactive Distillation with and without Internal Heat Integration

2016

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“…So far, a few methods have been proposed to deal with the limitations of the RDC in the separations of quaternary reversible reactions with the MURRV. The arrangement of double reactive sections at the top and bottom of the RDC can take advantage of the thermodynamic characteristics of such kinds of reacting mixtures and lead to a great improvement in system performance. , The inclusion of a top–bottom external recycle to the RDC can also make an effective use of the thermodynamic characteristics of such kinds of reacting mixtures and secure a great improvement in system performance. , Although these two strategies yield effective modifications to the configuration of the RDC, they fail to remove the necessity of a multiple-column system involving an RDC, followed by one or two CDCs, to separate the resultant quaternary reacting mixture with the MURRV. The dividing-wall technique can render such possibilities and give rise to reactive single or double dividing-wall distillation columns (R-SDWDCs or R-DDWDCs).…”

Section: Introductionmentioning

confidence: 99%

Reactive Double Dividing-Wall Distillation Columns: Structure and Performance

Zang

Zhang

Huang

et al. 2020

Ind. Eng. Chem. Res.

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The separations of quaternary reversible reactions with the most unfavorable ranking of relative volatilities (i.e., the two reactants are the lightest and heaviest components and the two products in between) require a reactive distillation column, followed by one or two conventional distillation columns. The multiple-column structure reflects not only a high energy intensity in the reaction operation and separation operation involved but also a great potential of process intensification in process development. With reference to a two-column system involving a reactive distillation column with an external recycle and a conventional distillation column (ER-RDC + CDC), a kind of reactive double dividing-wall distillation column (R-DDWDC) is derived via careful coordination and mass and thermal coupling between the ER-RDC and CDC. Closely dependent upon the magnitude of the reaction thermal effect, the left dividing wall is located either at the top or at the bottom. In addition to allowing the mass and thermal coupling between the ER-RDC and CDC, it facilitates primarily the reaction operation in the reactive section. The right dividing wall is located at the middle to fully strengthen the mass and thermal coupling not only between the ER-RDC and CDC but also between the separation operations included. The derived R-DDWDC features essentially the greatest degree of process intensification and becomes consequently the most thermodynamically efficient scheme in the separations of quaternary reversible reactions with the most unfavorable ranking of relative volatilities. The derived R-DDWDC is evaluated in terms of two examples, involving, respectively, the separations of ideal exothermic and endothermic quaternary reversible reactions with the most unfavorable ranking of relative volatilities. The derived R-DDWDC is found to be much more energy efficient than the ER-RDC + CDC, the reactive single dividing-wall distillation column, and those R-DDWDCs with different configurations. These outcomes demonstrate that the derived R-DDWDC is a much competitive alternative for the separations of quaternary reversible reactions with the most unfavorable ranking of relative volatilities. They also highlight the feasibility and effectiveness of the proposed strategy for process synthesis and design, that is, when the reaction processed is exothermic, the optimum R-DDWDC must come from one of R-DDWDC2 and R-DDWDC4; otherwise, the R-DDWDC4 remains to be the only possibility.

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“…6 With reference to the separation of unfavorable quaternary reacting mixtures (e.g., A + B ↔ C + D with α A > α C > α D > α B ), Zhang et al demonstrated that the RDC-DRS was much more energy efficient than the RDC-SRS. 7,8 In terms of the separation of reacting mixtures involving two-stage consecutive reversible reactions (e.g., A + advantages of the RDC-DRS over the RDC-SRS. 6 In the case of separating the disproportionation of trichlorosilane to silane (i.e., a three-stage consecutive reversible reaction that will be studied in the current work), Zang et al indicated that the incremental arrangement of reactive sections resulted in a steady improvement in steady-state performance from the RDC-SRS to the RDC-DRS and finally to the RDC-TRS.…”

Section: Introductionmentioning

confidence: 99%

“…The arrangement of multiple reactive sections (which, for example, gives rise to a reactive distillation column with double reactive sections (RDC-DRS) or a reactive distillation column with triple reactive sections (RDC-TRS)) can add great flexibility to process synthesis and design and hence improve their steady-state performance and broaden their applicability . With reference to the separation of unfavorable quaternary reacting mixtures (e.g., A + B ↔ C + D with α A > α C > α D > α B ), Zhang et al demonstrated that the RDC-DRS was much more energy efficient than the RDC-SRS. , In terms of the separation of reacting mixtures involving two-stage consecutive reversible reactions (e.g., A + B ↔ C + D, C + B ↔ E + D with α D > α B > α C > α A > α E ), Yu et al confirmed again the great advantages of the RDC-DRS over the RDC-SRS . In the case of separating the disproportionation of trichlorosilane to silane (i.e., a three-stage consecutive reversible reaction that will be studied in the current work), Zang et al indicated that the incremental arrangement of reactive sections resulted in a steady improvement in steady-state performance from the RDC-SRS to the RDC-DRS and finally to the RDC-TRS .…”

Section: Introductionmentioning

confidence: 99%

Controllability Evaluation for Reactive Distillation Columns with Multiple Reactive Sections Disproportionating Trichlorosilane to Silane

Huang

Yuan

Zang

et al. 2018

Ind. Eng. Chem. Res.

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In our recent work, the arrangement of multiple reactive sections is found to greatly enhance the steady-state performance of reactive distillation columns disproportionating trichlorosilane to silane. In the current research, process dynamics and controllability are studied through in-depth comparative analysis of open-loop and closed-loop behaviors between three reactive distillation columns with, respectively, a single reactive section (RDC-SRS), double reactive sections (RDC-DRS), and triple reactive sections (RDC-TRS). In the regulation path, although the arrangement of double and triple reactive sections reduces slightly the process gains between the bottom product composition and reboiler heat duty in the RDC-DRS and RDC-TRS, it helps to alleviate the coupling between the bottom product composition and reflux flow rate, thereby gaining increases in process controllability as compared with the RDC-SRS. In the disturbance path, the arrangement of double and triple reactive sections results in no intensified sensitivities to the disturbances from feed flow rate and composition. The closed-loop operation tests coincide with the open-loop analysis and demonstrate that the RDC-TRS and RDC-DRS exhibit substantially improved antidisturbance and set-point tracking capabilities as compared with the RDC-SRS. These outcomes highlight evidently the great importance of arranging multiple reactive sections to the dynamics and controllability of reactive distillation columns separating reacting mixtures with unfavorable and complicated reaction kinetics.

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Synthesis and design of reactive distillation columns with two reactive sections

Cited by 12 publications

References 19 publications

Control of Quaternary Ideal Endothermic Reactive Distillation with and without Internal Heat Integration

Control of Quaternary Ideal Endothermic Reactive Distillation with and without Internal Heat Integration

Reactive Double Dividing-Wall Distillation Columns: Structure and Performance

Controllability Evaluation for Reactive Distillation Columns with Multiple Reactive Sections Disproportionating Trichlorosilane to Silane

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