Poster Presentation 5-29
Technical-economical Simulation of Ethanol Production from Lignocellulosics
E. Viola, I. De Bari, G. Braccio and F. Zimbardi
ENEA – Renewable Energy Division, Policoro (MT) 75025, Italy
Telephone: 39 835 974486; Fax: 39 835 974210 ; E-mail: zimbardi@trisaia.enea.it
This work provides mass and energy balances of a medium-size model plant treating 25,000 ton/year of lignocellulosics to produce ethanol. The process is based on the following steps:
1) Steam explosion pretreatment; 2) Water soluble sugar recovery; 3) Simultaneous hydrolysis and fermentation of C5 sugars; 4) Simultaneous hydrolysis and fermentation of C6 sugars; 5) Broth distillation; and 6) Lignin recovery and use as fuel.
For each step the energy, water and chemical consumption have been evaluated. Emphasis was given to the stream recycling. Recovery of byproducts (e.g. furfural) produced in the pretreatment step was also considered. Data and literature were used from experiments carried out at the ENEA research center, as well as the operation of pilot facilities. Straw, poplar and waste paper were considered as feedstock. An economical analysis was formed, and the obtained cost breakdown is reported.
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