Bioethanol recovery and purification using extractive dividing-wall column and pressure swing adsorption: An economic comparison after heat integration and optimization

Loy, Y.Y.; Lee, X.L.; Rangaiah, Gade Pandu

doi:10.1016/j.seppur.2015.06.007

Cited by 63 publications

(57 citation statements)

References 27 publications

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“…In extractive distillation, Luo et al [39] obtained a 24% TAC reduction by using the top vapour stream to drive the side reboiler. Inspired by their study and by a recent pressure swing adsorption study where heat integration between two consecutive columns is done [40], we propose a new flow sheet sequence shown in Fig. 6 that one part of the extractive column reboiler duty is heated by the top vapour of the regeneration column with heat pump 2, and the left part is supplied by the top vapour of the extractive column with heat pump 1.…”

Section: Evaluation Of Vrc Heat Pump Assisted Distillation Processmentioning

confidence: 99%

Reducing process cost and CO2 emissions for extractive distillation by double-effect heat integration and mechanical heat pump

2016

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We study heat integration and mechanical heat pump processes for the extractive distillation. We propose a new objective function for optimizing heat integrated extractive distillation processes. We propose a novel partial heat integration process and two partial mechanical heat pump processes. The proposed optimal partial HI process gives the lowest TAC and the full BF process produces the lowest CO 2 emissions. The novel mechanical heat pump processes can effectively reduce initial investments and total annual cost.

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Section: Evaluation Of Vrc Heat Pump Assisted Distillation Processmentioning

confidence: 99%

Reducing process cost and CO2 emissions for extractive distillation by double-effect heat integration and mechanical heat pump

2016

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“…The non-random two-liquid model (with default binary interaction parameters) for the liquid phase and the Redlich-Kwong equation of state for the gas phase (NRTL-RK) in Aspen HYSYS are chosen. These two models are validated and used in Loy et al 28 Huang et al 18 and Gudena et al 29 used a stripper (i.e. DC without condenser) for ethanol recovery before dehydration by VP.…”

Section: Process Development and Simulation Of D-vp And Ded-vp Processesmentioning

confidence: 99%

“…In particular, most of the current ethanol dehydration facilities in the USA rely on hydrophilic zeolite molecular sieves. Hence we will compare the proposed DED-VP process with the hybrid process of distillation for recovery followed by pressure swing adsorption (PSA) for dehydration (D-PSA) studied and optimized in Loy et al 28 Using Eqn (7), calculated SEC for the D-PSA process is 4.96. Hence the optimized DED-VP process with SEC of 4.68 (Table 3) is 5% less energy-intensive.…”

Section: Comparison Of Hybrid Processesmentioning

confidence: 99%

Development and optimization of a novel process of double‐effect distillation with vapor recompression for bioethanol recovery and vapor permeation for bioethanol dehydration

Singh

Rangaiah

2018

J of Chemical Tech & Biotech

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BACKGROUND Bioethanol, an important biofuel, obtained from biomass fermentation is dilute and unsuitable for direct use as fuel for transportation. Its recovery and dehydration to ∼99.5 wt% ethanol is energy‐intensive because of dilute feed (∼10 wt% ethanol) and occurrence of ethanol–water azeotrope. From an energy efficiency perspective, hybrid separation processes consisting of a membrane‐based module coupled with distillation are a promising alternative to conventional separation by distillation alone. RESULTS The present article proposes the novel process of double‐effect distillation with vapor recompression (DED) for bioethanol recovery followed by vapor permeation (VP) for bioethanol dehydration (to 99.8 wt% ethanol) from a ternary feed of ethanol (10 wt%), water (89.9 wt%) and CO2 (0.1 wt%) and compares it with the process of simple distillation followed by vapor permeation (D‐VP). Multi‐objective optimization is performed for both processes, and the obtained Pareto‐optimal solutions for minimizing fixed capital investment and annual operating cost are presented and discussed. Compared with the optimal D‐VP process, the optimal DED‐VP process is found to be better, with 17 and 11% savings in energy consumption and total annual cost (TAC) respectively. CONCLUSION Specific energy consumption (SEC) of the DED‐VP process is 5% lower than that of the hybrid process of distillation for recovery followed by pressure swing adsorption for dehydration (D‐PSA) used industrially. Continued developments in membranes that can provide high permeance, selectivity and/or operating life can further reduce TAC and SEC of the DED‐VP process. © 2018 Society of Chemical Industry

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“…It is recommended for multicomponent liquid mixtures that are to be separated into at least three fractions with high purity requirements [10]. For industrial applications, the DWC have led to renewed interest in the design or redesign of many industrial processes, such as a cumene production process [11], a bioethanol plant [12], a butanol recovery process [13], and the ethylbenzene production process [14], due to reductions of the total annual cost (TAC) and energy consumption. Moreover, a combination of reactive distillation and a nonreactive DWC was presented to show the energy saving potential due to less vapor demand [15].…”

Section: Introductionmentioning

confidence: 99%

Economic and Risk Analyses of an Industrial N,N‐Dimethylformamide Recovery Process

Shi

et al. 2019

Chem Eng & Technol

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The industrial N,N-dimethylformamide (DMF) recovery plant is usually based on a two-column sequence (TCS) and the capacity of the wastewater treatment process is larger than 2000 kg h -1 . Here, a dividing-wall column (DWC)-based DMF recovery plant is proposed. The DWC avoids the remixing effect and reduces the utility duties by about 18.1 % and the CO 2 emissions by 15.2 %, compared to the TCS. The DWC effectively decreases the total annual cost by 3.4 % compared to that of the TCS and achieves a profitability index of 2.19 and an internal rate of return of 40.45 %. By Monte Carlo risk analysis, the DWC can increase the chance of earning the profit by up to 16 % compared to the TCS.

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Bioethanol recovery and purification using extractive dividing-wall column and pressure swing adsorption: An economic comparison after heat integration and optimization

Cited by 63 publications

References 27 publications

Reducing process cost and CO2 emissions for extractive distillation by double-effect heat integration and mechanical heat pump

Reducing process cost and CO2 emissions for extractive distillation by double-effect heat integration and mechanical heat pump

Development and optimization of a novel process of double‐effect distillation with vapor recompression for bioethanol recovery and vapor permeation for bioethanol dehydration

Economic and Risk Analyses of an Industrial N,N‐Dimethylformamide Recovery Process

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