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Vacuum fermentation integrated with separation process for ethanol production

Paper ID Volume ID Publish Year Pages File Format Full-Text
3733 184 2011 7 PDF Available
Title
Vacuum fermentation integrated with separation process for ethanol production
Abstract

In this study, continuous fermentation integrated with separation process at atmospheric and vacuum pressures are investigated. An initial glucose concentration of 200 g L−1 was used to produce yeast cells under batch operating mode. After a period of 18–20 h, a medium of 350 g L−1 glucose concentration was fed continuously to the fermentation-separation column. During the continuous experiments, fermented broth was recirculated back to the fermentation-separation column. At atmospheric pressure, the dry mass concentration decreased rapidly and remained at 2.4 g L−1 after long period, while glucose concentration still remained at 240 g L−1. On the other hand, at vacuum pressure, a quasi-steady state condition was reached after 96 h, corresponding to 4.2 g L−1 of cell dry mass, 165 g L−1 of glucose and 44.2 g L−1 of ethanol levels in the fermentation broth and 33.2 wt% of ethanol concentration at the outlet. These results indicate reduced product and substrate inhibition, suggesting that the integrated process could be used to replace the first bioreactor in a fermentation cascade system. A mathematical model was then developed and used to predict the kinetic parameters. The simulation results agreed well with experimental data.

► Fermentation reaction and separation of ethanol in the packed column. ► Kinetic parameters for the fermentation under the vacuum are predicted. ► A combination of CSTR mode and plug flow reaction mode for ethanol production.

Keywords
High substrate fermentation; Ethanol inhibition; Vacuum separation; Continuous column fermentation; Kinetic model
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 55, Issue 3, 15 August 2011, Pages 208–214
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us