A new unified model to simulate columns with multiple phase divisions and their impact on energy savings

Biasi, Lilian Caroline Kramer; Heinkenschloss, Matthias; Batista, Fábio Roberto de Souza; Zemp, Roger Josef; Romano, Ana L.R.; Meirelles, Antônio José de Almeida

doi:10.1016/j.compchemeng.2020.106937

Cited by 9 publications

(26 citation statements)

References 12 publications

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“…All columns were simulated, in MatLab, considering the mathematical model developed and validated in our previously work . This model is based on the MESH (mass and enthalpy balances and equilibrium relations) equations.…”

Section: Methodsmentioning

confidence: 99%

“…Metastillation columns consist of one vapor stream (β = 1) and θ ≥ 2 liquid streams. Details about the MESH equations, the model implementation, and its validation can be found in Biasi et al…”

Section: Methodsmentioning

confidence: 99%

“…In parastillation, it is possible to allocate more stages per column height than in the conventional and metastillation columns, , considering the parastillation construction scheme patented by Jenkins and shown in Figures and . In Figure , the height of a parastillation column with 21 stages (19 trays plus reboiler and condenser) is comparable to the height of a conventional column with 12 stages.…”

Section: Methodsmentioning

confidence: 99%

“…In the bioethanol concentration, a parastillation column, with two vapor phase divisions, reduces the operational and total annual costs up to 42% and 35% when compared to a conventional column of same height. , For fixed reflux ratio, two vapor divisions promote a reduction in column height of up to 26% over conventional distillation . A metastillation column applied to neutral alcohol distillation, as a replacement for the hydroselection column, reduces the equipment diameter by 10%, keeping the same number of stages .…”

Section: Introductionmentioning

confidence: 99%

“…The Naphtali and Sandholm method was adapted and a new set of MESH equations were formulated. The proposed model simulates different column configurations, just by specifying the number of phase partitions . Their work focused on the model development and its validation, giving valuable simulation tips.…”

Section: Introductionmentioning

confidence: 99%

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Distillation Columns with Multiple Phase Divisions: How They Improve Thermodynamic Efficiency and Decrease Energy Consumption

Biasi

Romano

Zemp

et al. 2021

Ind. Eng. Chem. Res.

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Distillation efficiency can be improved by columns with multiple phase divisions, also known as parastillation (vapor division) and metastillation (liquid division). Although, previous studies demonstrate that these configurations improve separation efficiency, little is known about the mechanisms that cause this improvement. These mechanisms are elucidated through exergetic and driving force analyses. Methanol-ethanol and multicomponent hydrated bioethanol purifications were investigated. Thermodynamic efficiency and exergy losses are improved when the number of phase divisions is increased. In methanol-ethanol distillation, the increase of the number of phase divisions from one to eight decreases both the operational costs and CO 2 emissions by 34% and increases thermodynamic efficiency by 23%. Considering a more feasible number of phase divisions, from the construction point of view, four divisions improve operational costs by 31%, over one division. In the production of hydrated bioethanol, four-vapor divisions lead to a reduction in energy consumption by 18% when compared with conventional distillation. This study shows that it is possible to reduce operating costs to a value close to the theoretical minimum, without a significant increase in capital costs. This observation contrasts with the conventional process, in which the reduction in operating costs necessarily leads to higher distillation columns and capital costs.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%