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Novel Heat-Pump-Assisted Extractive Distillation for Bioethanol Purification
Luo, Hao1,2; Bildea, Costin Sorin3; Kiss, Anton A.4,5

The purification of bioethanol fuel involves an energy-intensive separation process to concentrate the diluted streams obtained in the fermentation stage and to overcome the azeotropic behavior of the ethanol-water mixture. The conventional separation sequence employs three distillation columns that carry out several tasks, penalized by high-energy requirements: preconcentration of ethanol, extractive distillation, and solvent recovery. To solve this problem, we propose here a novel heat-pump-assisted extractive distillation process taking place in a dividing-wall column (DWC). In this configuration, the ethanol top vapor stream of the extractive DWC is recompressed from atmospheric pressure to over 3.1 bar (thus to a higher temperature) and used to drive the side reboiler of the DWC, which is responsible for the water vaporization. For a fair comparison with the previously reported studies, we consider here a mixture of 10 wt % ethanol (100 ktpy plant capacity) that is concentrated and dehydrated using ethylene glycol as mass-separating agent. Rigorous process simulations of the proposed vapor recompression (VRC) heat-pump-assisted extractive DWC were carried out in AspenTech Aspen Plus. The results show that the specific energy requirements drop from 2.07 kWh/kg (classic sequence) to only 1.24 kWh/kg ethanol (VRC-assisted extractive DWC); thus, energy savings of over 40% are possible. Considering the requirements for a compressor and use of electricity in the case of the heat-pump-assisted alternative, it is possible to reduce the total annual cost by approximately 24%, despite the 29% increase of the capital expenditures, for the novel process as compared to the optimized conventional separation process.

KeywordDividing-wall Column Dehydration Technologies
Subject AreaEngineering
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
WOS KeywordDividing-wall Column ; Dehydration ; Technologies
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000350192300028
Citation statistics
Cited Times:99[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorKiss, Anton A.
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Sinodanish Ctr Educ & Res, Beijing 100190, Peoples R China
3.Univ Politehn Bucuresti, Bucharest 011061, Romania
4.AkzoNobel, Proc Technol SRG, Res Dev & Innovat, NL-7418 AJ Deventer, Netherlands
5.Univ Twente, Fac Sci & Technol, Sustainable Proc Technol Grp, NL-7500 AE Enschede, Netherlands
Recommended Citation
GB/T 7714
Luo, Hao,Bildea, Costin Sorin,Kiss, Anton A.. Novel Heat-Pump-Assisted Extractive Distillation for Bioethanol Purification[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2015,54(7):2208-2213.
APA Luo, Hao,Bildea, Costin Sorin,&Kiss, Anton A..(2015).Novel Heat-Pump-Assisted Extractive Distillation for Bioethanol Purification.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,54(7),2208-2213.
MLA Luo, Hao,et al."Novel Heat-Pump-Assisted Extractive Distillation for Bioethanol Purification".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 54.7(2015):2208-2213.
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