Dividing wall column control: Common practices and key findings

Donahue, Melissa M.; Roach, Bailee; Downs, James J.; Blevins, Terry; Bâldea, Michael; Eldridge, R. Bruce

doi:10.1016/j.cep.2016.05.013

Cited by 42 publications

(36 citation statements)

References 32 publications

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“…So, in the continuous search to find better values for condition number, some other energetic or economic indexes are sacrificed and vice versa. This behavior agrees up to certain extent with the literature [53][54][55]: highly intensified systems (aiming at minimizing energy consumption under specific designs) imply a high degree of nonlinearity and interaction between variables, and loss of control degrees of freedom that restrict the operating conditions flexibility of the system, so the feasibility to find a good dynamic behavior zone it depends totally of a correct addressing as concern to energy consumption .…”

Section: Global Optimization Methodologysupporting

confidence: 86%

Optimal hybrid separations for intensified downstream processing of biobutanol

Sánchez‐Ramírez

Quiroz‐Ramírez

Hernández

et al. 2017

Separation and Purification Technology

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Current research focuses on new energy alternatives which could compete with the traditional energy sources based on fossil fuels, and eventually diminish the consequences on climate. Recently, butanol produced by ABE fermentation attracted more attention since its energy power is comparable to that of gasoline. But some hurdles are involved in the establishment of this fuel as an immediate substitute of fossil fuels, e.g. lower butanol concentration in the fermentation effluents and the expensive separation steps to purify the effluent. This work is the first to report the use of hybrid separation based on liquid-liquid extraction (LLX) combined with dividing-wall column (DWC) technology for the purification of the ABE (acetone-butanol-ethanol) mixture. The configurations proposed are the result of multiobjective optimization that aims to find designs that fulfill the tradeoff between those objectives: cost minimization, reduce environmental impact, and increase controllability. The downstream processing alternatives are designed and optimized by minimizing three objective functions simultaneously: the total annual cost (TAC) as an economical index, the eco-indicator 99 as an environmental function, and the condition number (CN) as control index. Among the four designs, the scheme where only a reboiler is included showed the best economic performances and relatively good values of condition number and eco indicator 99.

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Section: Global Optimization Methodologysupporting

confidence: 86%

Optimal hybrid separations for intensified downstream processing of biobutanol

Sánchez‐Ramírez

Quiroz‐Ramírez

Hernández

et al. 2017

Separation and Purification Technology

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“…In order to lessen the energy consumption of distillation processes effectively, various process intensification technologies have been proposed and dividing-wall distillation columns (DWDCs, c.f., Figure 1a) are the most famous of them all [1][2][3][4][5][6]. As a special sort of DWDCs separating quaternary mixtures, Kaibel distillation columns (c.f., Figure 1b) can reduce equipment investment and operation cost by about 40%, respectively, with reference to conventional direct, indirect and discrete distillation sequences.…”

Section: Introductionmentioning

confidence: 99%

Comparing Composition Control Structures for Kaibel Distillation Columns

et al. 2020

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Although Kaibel distillation columns are superior to conventional distillation sequences owing to smaller equipment investment and operation cost, they display high nonlinearity and this greatly increases the difficulty of achieving their tight control. To overcome this problem, four decentralized composition control structures, i.e., the CSR/QR, CSR/B, CSD/QR, and CSD/B structures, are proposed and compared based on the control of a Kaibel distillation column fractionating a methanol/ethanol/propanol/butanol quaternary mixture. These four composition control structures all include five composition control loops. While the four of them are employed to maintain the purity of the top, upper sidestream, lower sidestream, and bottom products, the remaining one is employed to minimize the energy consumption of the Kaibel distillation column by maintaining the composition of propanol at the first stage of the prefractionator. Dynamic simulation results show the CSR/QR and CSR/B structures can tightly maintain the purity of the controlled products with a small overshoot and short settling time after facing various disturbances in feed conditions, but the CSD/QR and CSD/B structures lead to oscillatory responses (the latter even shows divergent responses under individual disturbances). At the end of the article, some effective guides for developing composition control systems are given.

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“…Significant research and engineering efforts have been directed at lowering the energy consumption of distillation columns. In the design realm, we recall, e.g., thermal integration concepts (whereby a heat source -typically a condenser -within a column or a distillation train is used to meet heat demand in a sink -typically a reboiler), intensification (such as the case of dividing wall columns, whereby the function of two or more distillation columns is combined in a single shell, compartmented by a septum/wall) [5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Maximizing energy savings attainable by dynamic intensification of binary distillation

Yan¹,

Edgar²,

Bâldea³

2019

Studia UBB Chemia

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Dynamic intensification of distillation columns has shown significant promise in achieving energy savings with minimal investment in new equipment. Conceptually, it entails making a desired product as a blend of two auxiliary products (one with higher purity, the other with lower purity, but both having lower energy consumption). Practically, dynamic intensification means periodically switching between two operating states corresponding to the aforementioned products. Past work has relied on ad-hoc choices of auxiliary products. In this paper, we introduce a new optimization framework for selecting auxiliary products for dynamic intensification. An extensive case study concerning the separation of a methanol/propanol mixture is then presented. We show that optimizing the choice of auxiliary products can lead to significant energy savings (more than 3.6% compared to a column operated at steady state) derived from dynamic intensification.

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Dividing wall column control: Common practices and key findings

Cited by 42 publications

References 32 publications

Optimal hybrid separations for intensified downstream processing of biobutanol

Optimal hybrid separations for intensified downstream processing of biobutanol

Comparing Composition Control Structures for Kaibel Distillation Columns

Maximizing energy savings attainable by dynamic intensification of binary distillation

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