Towards further internal heat integration in design of reactive distillation columns—part I: The design principle

Huang, Kejin; Iwakabe, Koichi; Nakaiwa, Masaru; Tsutsumi, Atsushi

doi:10.1016/j.ces.2005.03.052

Cited by 42 publications

(28 citation statements)

References 24 publications

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“…The design algorithm is relatively easy in principle, but it cannot guarantee the optimal column configuration due to its heuristic nature. As pointed out by Huang et al [55], there is therefore still a lack of efficient heuristics rules for the optimal design of reactive distillation processes.…”

Section: Heuristic Methodsmentioning

confidence: 99%

Reactive Distillation

Keller

2014

Distillation

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Section: Heuristic Methodsmentioning

confidence: 99%

Reactive Distillation

Keller

2014

Distillation

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“…Internal mass integration requires that reactive section should be located to favor the reaction operation and the separation operation involved. In case of conflicts occurring between these two operations, a careful compromise should be made during process synthesis and design . For the RDC‐MURV with two reactive sections at its top and bottom, respectively, although the reaction operation could be strengthened with the introduction of the lightest reactant A and the heaviest reactant B onto the reboiler and condenser, respectively, a detrimental effect was aroused actually to the separation operation.…”

Section: Overview Of the Currently Available Design Methods For The Rmentioning

confidence: 99%

“…The economical advantages of reactive distillation columns originate essentially from the intensified internal mass integration and internal energy integration between the reaction operation and the separation operation involved (i.e., the so‐called process intensification). A number of methods have already been proposed for the reinforcement of internal mass integration and internal energy integration within a reactive distillation column, and these included the superimposition of reactive section onto the rectifying section and/or stripping section, the relocation of feed stages and multiple feed arrangement, and the redistribution of catalyst in the reactive section . Apart from these structural design strategies, the detailed operating conditions of a reactive distillation column, for example, the thermal conditions of reactant feed flows and operating pressure, may also affect the combination between the reaction operation and the separation operation involved and should be considered carefully during process synthesis and design.…”

Section: Introductionmentioning

confidence: 99%

Enhancing mass and energy integration by external recycle in reactive distillation columns

et al. 2012

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in Wiley Online Library (wileyonlinelibrary.com).The synthesis and design of reactive distillation columns separating reacting mixtures with the most unfavorable relative volatilities (i.e., the reactants are the heaviest and lightest components with the products being the intermediate ones) are described. The unfavorable thermodynamics poses great difficulties in combining the reaction operation and the separation operation involved and limits severely the potential of reactive distillation columns in the reduction of capital investment (CI) and operating cost. To remove the limitation, we propose two strategies for facilitating the synthesis and design of this kind of reactive distillation columns in this article. One is to arrange prudentially the reactive section so as to strengthen internal energy integration between the reaction operation and the separation operation involved; that is, while the reactive section should be placed at the bottom of the reactive distillation columns separating exothermic reactions, it should be at the top of the reactive distillation columns separating endothermic reactions. The other is to introduce an external recycle flow between the two ends of the reactive distillation columns to reinforce internal mass integration and internal energy integration between the reaction operation and the separation operation involved; that is, whereas the external recycle flow should be directed from the top to bottom of the reactive distillation columns separating exothermic reactions, it should be from the bottom to top of the reactive distillation columns separating endothermic reactions. Separation of four hypothetical ideal (i.e., two quaternary and two ternary systems, respectively) and two real nonideal (i.e., two quaternary systems) reacting mixtures is chosen to evaluate the proposed strategies. The results show that they can considerably lower energy requirement besides a further reduction in CI. (a) For exothermic reaction; (b) for endothermic reaction.(a) Net reaction rates; (b) liquid composition. Dotted line: scheme with two reactive sections; dashed line: scheme with one bottom reactive section; and solid line: scheme with an external recycle flow from its top to bottom. (a) Net reaction rates; (b) Liquid composition. Dotted line: scheme with two reactive sections; dashed line: scheme with one top reactive section; and solid line: scheme with an external recycle flow from its bottom to top. (a) Net reaction rates; (b) liquid composition. Dotted line: scheme with two reactive sections; dashed line: scheme with one bottom reactive section; and solid line: scheme with an external recycle flow from its top to bottom. (a) Net reaction rates; (b) liquid composition. Dotted line: scheme with two reactive sections; dashed line: scheme with one top reactive section; and solid line: scheme with an external recycle flow from its bottom to top.

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“…With regard to the design of RD columns, instead of feeding the reactants at the ends of the reactive zone, Huang et al [49,50] showed that considerable energy savings are possible with appropriate selection of the feed tray locations and the redistribution of catalyst/reaction inside the RD columns based on the nature of the heat of reaction, i.e., exothermic or endothermic. It is collectively referred as internal heat integration of Figure 1.…”

Section: Heat-integrated Rd Column (Hirdc)mentioning

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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Towards further internal heat integration in design of reactive distillation columns—part I: The design principle

Cited by 42 publications

References 24 publications

Reactive Distillation

Reactive Distillation

Enhancing mass and energy integration by external recycle in reactive distillation columns

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

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