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Downstream process options for the ABE fermentation.

Anton Friedl1

  • 1Department of Chemical Engineering, TU Wien, Getreidemarkt 9, 1060 Vienna, Austria anton.friedl@tuwien.ac.at.

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|March 30, 2016
PubMed
Summary

Traditional butanol separation is energy-intensive. Novel hybrid processes, including adsorption/drying/desorption, offer significantly lower energy demands for butanol recovery, though industrial applicability requires further validation.

Keywords:
ABE fermentationbiobutanoldownstream process optimizationgas-strippingliquid–liquid extractionpervaporation

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Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Sustainable Energy

Background:

  • Butanol is a valuable chemical and biofuel.
  • Conventional distillation for butanol separation is highly energy-intensive (220% of butanol's energy content).
  • Efficient separation methods are crucial for economic viability and environmental sustainability.

Purpose of the Study:

  • To evaluate alternative, energy-efficient separation processes for butanol.
  • To compare the energy demands of hybrid separation techniques with traditional distillation.
  • To assess the industrial applicability of novel butanol separation methods.

Main Methods:

  • Review and analysis of hybrid separation processes including gas-stripping, liquid-liquid extraction, and pervaporation combined with distillation.
  • Investigation of a novel adsorption/drying/desorption hybrid process.
  • Energy demand calculation as a percentage of butanol's energy content for each process.

Main Results:

  • Optimized hybrid processes like pervaporation/distillation and liquid-liquid extraction/distillation show significantly reduced energy demands (11%-22% and 11%-17%, respectively).
  • A novel adsorption/drying/desorption process demonstrates the lowest energy demand at 9.4%.
  • All evaluated downstream process options require further validation for industrial scalability and applicability.

Conclusions:

  • Hybrid separation processes offer substantial energy savings compared to traditional butanol distillation.
  • The adsorption/drying/desorption process presents a promising low-energy alternative for butanol recovery.
  • Further research and development are necessary to confirm the industrial feasibility of these advanced separation technologies.