1. Product recovery optimization during alcohol fermentation
ABE-Fermentation
Product recovery optimization
during alcohol fermentation
Rom Antonia Friedl Anton
Gefördert bzw. finanziert in der Programmlinie „A3plus“ – vom Bundesministerium für Verkehr, Innovation und Technologie (BMVIT)

2. Butanol – the next bio fuel
ABE-Fermentation
Butanol –
the next bio fuel
Starch products
Fermentation
Down Streaming
The Project:
Pro Butanol
Contra Butanol
High energy content
Low productivity
Low water absorption
Product inhibition at 20 g/l
Low vapor pressure
Good blending ability
Less corrosive
Investigation of different down streaming processes
Assessment of different membrane materials
On – line down streaming during fermentation process
Simulation in Aspen Plus

3. Down Streaming in ABE - Fermentation
Substrate: wheat bran Fermentation broth: Aqueous solution with 6:3:1 ratio (Butanol:Acetone:Ethanol) Due to product inhibition in-situ butanol recovery is investigated by membrane separation or gas stripping
Vacuum Membrane distillation
Pervaporation
Gas stripping
(liquid)
(liquid)
(vapour)

4. Vacuum Membrane Distillation
ABE-Fermentation
Vacuum Membrane Distillation
vacuum
concentrated
butanol
ABE - broth

5. Membrane Distillation Pervaporation
ABE - Fermentation
Membrane Distillation
Pervaporation
Porous membrane
Dense membrane
Material: PP
Material: e.g. PDMS, Zeolith
Capillary module
Flat sheet module
Tubulare module
Zeolith module

6. ABE - Fermentation
CP – capillary module
TP – tubular module
The effect of feed concentration and permeate pressure on butanol flux
The effect of feed concentration and permeate pressure on selectivity
Higher vacuum on permeate site as well as an increasing feed concentration yields higher transmembrane fluxes. Though it results in different selective characteristics.