Difference points in reactive and extractive cascades. III—Properties of column section profiles with arbitrary reaction distribution

Hoffmaster, Warren R.; Hauan, Steinar

doi:10.1016/j.ces.2004.05.013

Cited by 9 publications

(6 citation statements)

References 53 publications

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“…This initialization is made while the reactive holdup required for the specified conversion at each section is minimized. The reactive liquid holdup is scaled using the dimensionless Damköhler number . The potential feasibility of the overall design is then verified by checking the intersection of both sectional profiles in the composition space.…”

Section: Methodsmentioning

confidence: 99%

“…Reactive systems are more complex because the sectional profiles depend not only on the reflux ratio but also on the way a particular amount of reaction is distributed within a sequence of stages. , The feasible regions approach was extended to the design of distillation columns with kinetically controlled reactions and multiple side streams by Hoffmaster and Hauan . Later, they also optimized the design of reactive distillation columns with multiple feeds and generated trade-off curves relating the minimum number of stages and the minimum amount of reactive holdup with a view to compare different design alternatives.…”

Section: Introductionmentioning

confidence: 99%

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Multiobjective Design of Reactive Distillation with Feasible Regions

Filipe

Turnberg

Hauan

et al. 2008

Ind. Eng. Chem. Res.

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This work addresses the multiobjective design of complex reactive distillation columns through the use of feasible regions. A cost indicator reflecting energy usage and column size is introduced and used to build the Pareto surface describing the optimal combinations of cost and performance. The study includes the use of superheated and subcooled feed streams and searches for the optimal distribution of feeds and catalyst inside the column. The technique is first illustrated for a base case system with ideal vapor-liquid equilibrium and then for two variants with different volatilities for reactants and products. The best trade-off solutions for each system are identified, the operating conditions analyzed, and a selected number of cases investigated further using rigorous simulation in Aspen Plus. Important insights gained and a few heuristic rules about the distribution of the reaction and feed in the column are presented. Furthermore, a methodology that may potentially contribute to overcome limitations on catalyst volume by increasing the specific reaction turnover is presented.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiobjective Design of Reactive Distillation with Feasible Regions

Filipe

Turnberg

Hauan

et al. 2008

Ind. Eng. Chem. Res.

Self Cite

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“…Each section must also achieve the total turnover specification when kinetics and per‐stage liquid holdups are used to compute the amount of reaction on each stage. Hoffmaster17 summarizes the rectifying and stripping section equations formulated in terms of difference points18 and dimensionless parameters 19. There are also several constraints necessary to satisfy the full‐column material balance and connecting the column sections.…”

Section: Examplesmentioning

confidence: 99%

“…4, the rectifying section is initialized by solving the material balance equations with an objective of minimizing the total liquid holdup in the section. The Damköhler number (Da n ) represents a dimensionless amount of reactive liquid holdup on stage n 19. Hoffmaster17 explains why the Damköhler number is convenient for capturing per‐stage reactive liquid holdups.…”

Section: Examplesmentioning

confidence: 99%

Using feasible regions to design and optimize reactive distillation columns with ideal VLE

Hoffmaster

Hauan

2006

AIChE Journal

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“…Graphically based methods overcome this problem. [7][8][9][10][11][12][13] Hauan et al used the difference point method to identify feasible column designs. They also considered the alternative of a reactor and reactive distillation column.…”

Section: Introductionmentioning

confidence: 99%

Conceptual Design of Equilibrium Reactor−Reactive Distillation Flowsheets

Daniel

Jobson

2006

Ind. Eng. Chem. Res.

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Economic and environmental reasons have led to process intensifications in the process industries. Reactive distillation is the most prominent example. However, often it is a challenge to satisfy the requirement for sufficient catalyst volume for the reaction while providing the interfacial area needed for mass transfer. The combination of a reactive distillation column with a pre-reactor is a valuable alternative. This paper presents an approach to identify promising designs for such flowsheets and the optimum distribution of the reaction extent between the pre-reactor and the reactive distillation column. The methodology uses a boundary value method for the design of the column; chemical equilibrium is assumed. The column usually consists of a reactive “core”, two rectifying sections, and one stripping section. The methodology will be demonstrated for the production of ethyl-tert-butyl-ether (ETBE).

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Difference points in reactive and extractive cascades. III—Properties of column section profiles with arbitrary reaction distribution

Cited by 9 publications

References 53 publications

Multiobjective Design of Reactive Distillation with Feasible Regions

Multiobjective Design of Reactive Distillation with Feasible Regions

Using feasible regions to design and optimize reactive distillation columns with ideal VLE

Conceptual Design of Equilibrium Reactor−Reactive Distillation Flowsheets

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