Rapid generation of composition profiles for reactive and extractive cascades

Chin, James; Lee, Jae Woo

doi:10.1002/aic.10343

Cited by 8 publications

(18 citation statements)

References 16 publications

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“…Chin and Lee [1] proposed a critical value of ∼ 5 to obtain the pure products. Chin and Lee [1] proposed a critical value of ∼ 5 to obtain the pure products.…”

Section: Ethyl Acetatementioning

confidence: 99%

“…These equations involve the total and component mass balances (Eqs. (1) and (2)), the energy balance (Eq. (3)), phase equilibrium (Eq.…”

Section: Fundamentals and Extension To Fam For Double-feed Rdcsmentioning

confidence: 99%

“…Chin and Lee [1] found the ranges of feasible external reflux ratios and entrainer flow rates for RDCs. Here, the pinch points of the middle section are tracked and the feasibility bounds for double-feed RDCs are obtained.…”

Section: Fundamentals and Extension To Fam For Double-feed Rdcsmentioning

confidence: 99%

“…Reactive distillation columns (RDCs) benefit from both higher efficiency and lower cost and often provide a more uniformly distributed reaction [1]. A simple and fast conceptual design method to screen different alternatives, assess the feasibility of the process, and determine the feasible bounds of design parameters is required to address an economical design process.…”

Section: Introductionmentioning

confidence: 99%

“…This method requires tedious iterations, and the graphical feasibility assessment limits its applicability. Chin and Lee [1] also present a method which involves the calculation of all possible pinch points of the middle section and then draws the manifold of all possible composition profiles. It is highly computational and with graphical inspection.…”

Section: Introductionmentioning

confidence: 99%

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Conceptual Design of Double‐Feed Reactive Distillation Columns

Avami

2012

Chem Eng & Technol

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The feasibility and feasible range of operating parameters for double-feed reactive distillation columns are evaluated, based on the combination of pinch point map analysis for the middle-section in the compositional space and the feed angle method as an efficient shortcut design method. Limiting bounds for operating parameters are determined where the properties of singular points change. The existence and values of such bounds may vary in double-feed reactive distillation columns depending on the nature of the system under study. The methodology is illustrated by production of methyl acetate and ethyl acetate. An efficient method is described to identify the most promising candidates of double-feed reactive distillation columns and to study the design flexibility in terms of operating parameters.

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“…Chin and Lee [1] proposed a critical value of ∼ 5 to obtain the pure products. Chin and Lee [1] proposed a critical value of ∼ 5 to obtain the pure products.…”

Section: Ethyl Acetatementioning

confidence: 99%

“…These equations involve the total and component mass balances (Eqs. (1) and (2)), the energy balance (Eq. (3)), phase equilibrium (Eq.…”

Section: Fundamentals and Extension To Fam For Double-feed Rdcsmentioning

confidence: 99%

Section: Fundamentals and Extension To Fam For Double-feed Rdcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Conceptual Design of Double‐Feed Reactive Distillation Columns

Avami

2012

Chem Eng & Technol

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Feasible products in complex batch reactive distillation

2006

Self Cite

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A new feasibility evaluation procedure for reactive mixtures is presented, where simple homogeneous reactive batch columns cannot produce pure products. Such columns are not feasible for producing pure products if no node products exist that are reachable by residue curves from the reaction equilibrium manifold. Three alternatives are presented. If an unstable node heterogenous azeotrope decants to an almost-pure product, and that azeotrope is always reachable from the reaction equilibrium manifold, then a batch reactive rectifier can produce pure products with a decanter. If a homogeneous entrainer allows extractive section profiles to connect the reaction equilibrium manifold to an entrainer-product binary edge, then a homogeneous batch reactive extractive distillation (BRED) column can produce a pure product. If these criteria are not met, then an entrainer that induces an unstable node heterogenous azeotrope between itself and one of the products should be used in a rectifier, a middle-vessel column, or a BRED column. © 2006 American Institute of Chemical Engineers AIChE J, 52: 1790AIChE J, 52: -1805AIChE J, 52: , 2006 Keywords: feasible products, complex batch reactive distillation IntroductionReactive distillation has become an attractive process technology in recent years, because of the potential reductions in capital costs, operating costs, and environmental impacts. In particular, reactive distillation can be used to conduct processes that would be prohibitively complicated and unwieldy if handled in a conventional process consisting solely of many single-operation units. This is because of two thermodynamic advantages in carrying out reaction and separation simultaneously rather than sequentially 1-2 (1) phase separation can overcome reaction equilibrium limitations, and (2) chemical reaction can circumvent phase equilibrium limitations, such as azeotropes and distillation boundaries. The Eastman chemical process for producing methyl acetate is a prime example of the benefits of reactive distillation. [3][4][5] However, it is not a widely applied technology primarily because most of the commercial reactive distillation processes in use today were developed in a trial-and-error manner, with little understanding of how reaction and separation phenomena interact when performed in the same piece of equipment.Batch production systems are commonly used in the smallscale production of pharmaceuticals, fine chemicals, and specialty chemicals. Batch distillation systems have the advantages of low capital costs, considerable flexibility, the ability to separate multiple components from a single column, being easy to handle, being easy to perform quality control checks on, and usually being able to accept a wide range of feed compositions.Various studies have been conducted regarding the operating policies and parameters for batch distillation systems 6-8 and batch extractive distillation systems. [9][10][11][12][13][14] There have been many feasibility studies on nonreactive batch distillation that use residue...

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A generic feasibility study of batch reactive distillation in hybrid configurations

Stéger¹,

Lukacs²,

Rév³

et al. 2009

AIChE Journal

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A new graphical feasibility method is developed to investigate batch reactive distillation processes in middle vessel column. The suggested methodology can deal with fully reactive, nonreactive, and complex column configuration. A new formulation is suggested to describe the composition profiles in the reactive sections. Its application has made possible to develop a generic feasibility methodology containing the same model equations independently of the presence or absence of reaction. By combining the reactive and nonreactive models, not only the fully reactive and fully nonreactive but also hybrid configurations can be studied. Feasibility criteria related to the hybrid configurations are also presented. Application of the new methodology is demonstrated on the production of ethyl acetate in batch reactive distillation. Five configurations are found feasible; pure EtOAc is produced as distillate, and pure H 2 O is produced at the bottom. In each case, continuous feeding of AcOH is necessary. V V C 2009 American Institute of Chemical Engineers AIChE J, 55: 1185AIChE J, 55: -1199AIChE J, 55: , 2009 Keywords: separation, reactive distillation, design, feasibility study, hybrid column IntroductionApplying reactive distillation is one of the most important options for process intensification. 1,2 In traditional processes, the reaction itself and the separation of the reaction products are carried out in subsequent operations, and in separate devices. Total conversion cannot be reached if the reaction is equilibrium limited, and the nonreacted components must be recycled to the reactor. This recycling increases the investment and the energy demand, as well. In addition, transportation of the compounds between the equipment units makes the production more hazardous.In reactive distillation, on the other hand, the reaction and the separation are carried out in one operation, in the same unit ( Figure 1). The investment costs are decreased because of the decreasing number of operation units. The operation costs, the hazards related to the process, and the amount of by-products are also decreased because no external recycling is applied.In spite of the numerous advantages, the number of industrial applications is yet small. One of the reasons of this reluctance may be the lack of well-known design and control Correspondence concerning this article should be addressed to C. Stéger at stegercsaba@googlemail.com. methodology. Hence, the thorough investigation and deep understanding of this integrated process is a really important task.Preliminary design methodologies are normally applied to find a feasible configuration accompanied by a suggested value or range of the most important operation parameters. These methods usually rely on some simplified model with thermodynamic approach, 3 namely they neglect such technical parameters such as the hold-up, the pressure drop, the height and the diameter of the column, and so forth. Most of the preliminary methods work in graphical mode; this eases their understanding but, at t...

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Rapid generation of composition profiles for reactive and extractive cascades

Cited by 8 publications

References 16 publications

Conceptual Design of Double‐Feed Reactive Distillation Columns

Conceptual Design of Double‐Feed Reactive Distillation Columns

Feasible products in complex batch reactive distillation

A generic feasibility study of batch reactive distillation in hybrid configurations

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