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Related Experiment Videos

Continuous fermentation and stripping of ethanol

F Taylor1, M J Kurantz, N Goldberg

  • 1Agricultural Research Service, Eastern Regional Research Center, Philadelphia, Pennsylvania 19118, USA.

Biotechnology Progress
|November 1, 1995
PubMed
Summary

Recycling fermentor contents via a stripping column reduces product inhibition and costs for fuel ethanol production. This continuous process achieved high glucose conversion, showing potential as a cost-effective alternative.

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Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Sustainable Energy

Background:

  • Product inhibition is a major challenge in fuel ethanol production, limiting efficiency and increasing costs.
  • Conventional fermentation and distillation methods are energy-intensive and can be economically suboptimal for large-scale fuel ethanol synthesis.

Purpose of the Study:

  • To investigate the efficacy of recycling fermentor contents through a stripping column to mitigate product inhibition in fuel ethanol production.
  • To evaluate the economic viability and technical feasibility of a continuous fermentor/stripper system for fuel ethanol synthesis.

Main Methods:

  • Continuous operation of a 2-L fermentor coupled with a 10-cm packed stripping column for 150 days.
  • Utilized computerized process simulation for data analysis and performance evaluation.

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  • Assessed cell yield, glucose conversion rates, and potential for contamination.

    • Main Results:

    • Achieved complete conversion of 200 g/L glucose and 90% conversion of 600 g/L glucose feed.
    • Observed some yeast cell fouling in the stripping column, leading to partial blockage.
    • Demonstrated a lower cell yield compared to a simple continuous fermentor.

    Conclusions:

    • The continuous fermentor/stripper system effectively reduces product inhibition and enables high glucose conversion for fuel ethanol production.
    • Despite minor fouling, the system shows promise as a potentially lower-cost alternative to conventional methods, especially with heat recovery.
    • Further optimization may be needed to address cell yield and fouling for enhanced industrial application.