ABE Fermentation - TU Wien - Institut für Verfahrenstechnik

Report
Thermal Process Engineering
ABE-Fermentation
Product recovery optimization
during alcohol fermentation
Rom Antonia
Friedl Anton
[email protected]
Gefördert bzw. finanziert in der Programmlinie „A3plus“ – vom Bundesministerium für Verkehr,
Innovation und Technologie (BMVIT)
Achema 2012
Institute of Chemical Engineering
page 1
Thermal Process Engineering
ABE-Fermentation
Butanol –
the next bio fuel
Starch
products
Fermentation
Down
Streaming
The Project:

Investigation of different down streaming
processes

Assessment of different membrane materials

On – line down streaming during fermentation
process

Simulation in Aspen Plus
Achema 2012
High energy content
Low productivity
Low water absorption
Product inhibition at 20 g/l
Low vapor pressure
Good blending ability
Less corrosive
Institute of Chemical Engineering
page 2
Thermal Process Engineering
ABE-Fermentation
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
(liquid)
(liquid)
(vapour)
Achema 2012
Institute of Chemical Engineering
page 3
Thermal Process Engineering
ABE-Fermentation
Vacuum Membrane Distillation
vacuum
concentrated
butanol
ABE - broth
Achema 2012
Institute of Chemical Engineering
page 4
Thermal Process Engineering
ABE - Fermentation
Porous membrane
Dense membrane
Material: PP
Material: e.g. PDMS, Zeolith
Capillary module
Flat sheet module
Tubulare module
Zeolith module
Achema 2012
Institute of Chemical Engineering
page 5
Thermal Process Engineering
ABE - Fermentation
butanol flux
selectivity
250
150
TP 25mbar
10
CP 50mbar
8
TP 50mbar
α [-]
200
J [g/m²h]
12
CP 25mbar
6
100
4
50
CP – capillary module 2
TP – tubular module
0
0
0.5
1
1.5
2
Feed concentration [w %]
The effect of feed concentration and
permeate pressure on butanol flux
0
0
0.5
1
1.5
2
Feed concentration [w %]
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.
Achema 2012
Institute of Chemical Engineering
page 6

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