Design and operation of dividing-wall distillation columns. 2. Process dynamics and operation

Zong, Xin; Huang, Kejin; Yuan, Yang; Chen, Haisheng; Yu, Jieping

doi:10.1016/j.cep.2015.03.005

Cited by 8 publications

(5 citation statements)

References 29 publications

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“…Another widely used configuration is the so-called split shell column which can be designed either with a common overhead section and divided bottoms or the other way around . Reviews and illustrations on the design − ,, and control of DW ,,− are recommended as excellent references. Moreover, integrative works such as the design procedure and sensitivity analysis based on parameters such as the number of stages, vertical position, and height of the wall with further experimental validation for the separation of a multicomponent alcohol mixture have also been recently reported …”

Section: Introductionmentioning

confidence: 99%

Process Intensification of the Synthesis of Biomass-Derived Renewable Polyesters: Reactive Distillation and Divided Wall Column Polyesterification

Lomelí-Rodríguez

Rivera-Toledo

López-Sánchez

2017

Ind. Eng. Chem. Res.

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We present the reactor simulation, multiobjective optimization, and the process intensification of biomass-derived polyesters: poly(1,5 pentylene 2,5-furan dicarboxylate) (PPeF), poly(1,5-pentylene 2,5-furandicarboxylate-co-1,5-pentylene succinate) (PPeFS), and poly(1,5-pentylene succinate) (PPeS). A plug flow reactor (PFR) was the first configuration considered, and the intensification of the polyesterification was done considering a reactive distillation (RD) and a divided wall column (DW) configuration. The process simulations along with the ε-constraint optimization methodology and sensitivity analyses were implemented in Aspen Plus for a step-growth polymerization mechanism, where the segment concentration profiles, number molecular weight (M n), and degree of polymerization (DPN) were estimated for each polyester, using poly(ethylene terephthalate) (PET) as the reference polyester. The M n values obtained were in the range of 2300–4800 Da, suitable for coil coating applications, and the optimum operation temperatures were between 205 and 230 °C. The configurations were compared in terms of common sustainability indicators: CO2 emissions (GWP), energy intensity (R SEI), and mass efficiency (ME). It was determined that the GWP for PPeF was the lowest of all the polymers, and approximately 50% lower than that for PET in the PFR synthesis. The synthesis of PPeF represented the lowest net energy consumption, followed by PPeFS 30/70, regardless of the reactor configuration. In all cases, reactive distillation was the most energy efficient configuration, as the R SEI indicator was below those corresponding to PFR and divided wall, which proves the effect of the intensification in an industrial polyesterification reaction.

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Section: Introductionmentioning

confidence: 99%

Process Intensification of the Synthesis of Biomass-Derived Renewable Polyesters: Reactive Distillation and Divided Wall Column Polyesterification

Lomelí-Rodríguez

Rivera-Toledo

López-Sánchez

2017

Ind. Eng. Chem. Res.

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“…So, it can be considered as a milestone in the development of DWC technology. Recently, in China more and more efforts have been devoted from theoretical research to industrial application in the field of DWCs . Some companies and design institutes focused on this technology and showed interest in new devices or revamped projects.…”

Section: Introductionmentioning

confidence: 99%

Design of a Dividing‐Wall Column Considering its Multiple Steady State Characteristic

Song

Wang

2017

Chem Eng & Technol

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A dividing-wall column (DWC) may have more than one solution of liquid and vapor split ratio for the same feed and product streams under a fixed number of stages and reflux ratio, so the multiple steady states (MSS) of a DWC in the design stage should be considered. An improved design method of a DWC is proposed by studying its MSS characteristics. Additional steps are inserted after optimization to check if MSS exist for the obtained optimal solution of vapor and liquid split ratio, and further to select the best candidate. Finally, two cases of threeproduct DWCs are described to verify this method. The results indicate that multiple solutions exist for these cases, which confirm the necessity of this method and provide an important guidance for the flowing design of a DWC.

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“…[11][12][13][14][15] In view of its unique and complicated formation mechanism, recently we initiated to study it systematically and denoted it the black-hole (BH) problem of the DWDC. [16][17][18][19] It was already indicated that the unusual phenomenon originated essentially from the exceeding material and thermal coupling between the prefractionator and main distillation column (MDC) involved, which represented a common and yet important problem that must be addressed with great caution in all kinds of process intensification. [20,21] With respect to the DWDC, this meant that in addition to the pursuit of the economic benefits in capital investment and operating cost, it was also imperative to compromise the interactions between these two highly integrated units during process synthesis and design.…”

Section: Introductionmentioning

confidence: 99%

“…Despite that the pitfall can restrain considerably the flexibility and applicability of the DWDC, it has received scarce attention so far in the areas of process design and operation . In view of its unique and complicated formation mechanism, recently we initiated to study it systematically and denoted it the black‐hole (BH) problem of the DWDC . It was already indicated that the unusual phenomenon originated essentially from the exceeding material and thermal coupling between the prefractionator and main distillation column (MDC) involved, which represented a common and yet important problem that must be addressed with great caution in all kinds of process intensification .…”

Section: Introductionmentioning

confidence: 99%

Employing feed splitting to eliminate the black‐hole problem of dividing‐wall distillation columns

Yuan

Chen

et al. 2015

Asia-Pacific J Chem Eng

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Because of the intensive material and thermal coupling within dividing‐wall distillation columns (DWDCs), the so‐called black‐hole (BH) problem may occur and arouse consequently uncertainties to control simultaneously the primary component compositions in the top, intermediate, and bottom products and the composition ratio between the rest components in the intermediate product. The elimination of the BH problem is attempted through the adoption of feed splitting in this work, and a systematic procedure is derived to achieve the purpose. Because feed splitting augments the decision variables for process synthesis and design, it could be used effectively to refine the relationship between the prefractionator and main distillation column involved and lead to the elimination of the BH problem. The design and operation of a DWDC fractionating an equi‐molar mixture of ethanol, propanol, and butanol are examined to evaluate the systematic procedure proposed. Both open and closed‐loop controllability assessments demonstrate that feed splitting can serve as an effective means to eliminate the BH problem. The resultant DWDC with the elimination of the BH problem is even found to exhibit improved process dynamics and controllability when three specifications have been given, respectively, to the primary components of its three products. © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.

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Design and operation of dividing-wall distillation columns. 2. Process dynamics and operation

Cited by 8 publications

References 29 publications

Process Intensification of the Synthesis of Biomass-Derived Renewable Polyesters: Reactive Distillation and Divided Wall Column Polyesterification

Process Intensification of the Synthesis of Biomass-Derived Renewable Polyesters: Reactive Distillation and Divided Wall Column Polyesterification

Design of a Dividing‐Wall Column Considering its Multiple Steady State Characteristic

Employing feed splitting to eliminate the black‐hole problem of dividing‐wall distillation columns

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