A techno-economic evaluation of a softwood bark biorefinery concept integrated into a typical Finnish chemical pulping mill was carried out. Due to the higher carbohydrate content of spruce bark over pine bark, spruce bark was chosen to be the feedstock of the study. The pulp production capacity of the mill was assumed to be 600 000 t/yr. Since bark constitutes about 10% of the softwood the total amount of bark at the mill is 130 000 t dry bark/yr. In this study half of this bark is led to the bio-refinery. The clear conclusion of the study is that the studied concept is not profitable with current prices and process steps: Enzyme and feedstock costs constitute the major part of the operation and maintenance costs (~70%). From the cost structure it can also be seen, that the price of the end products should be several €/kg. One profitable concept would be the extraction of phenolics straight from bark or from pre-treated bark and upgrading them to valuable products.
|Publication status||Published - 2008|
|MoE publication type||Not Eligible|
|Event||11th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2008 - Prague, Czech Republic|
Duration: 24 Aug 2008 → 28 Aug 2008
|Conference||11th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2008|
|Abbreviated title||PRES 2008|
|Period||24/08/08 → 28/08/08|
- Bark biorefinery
- Techno-economic study
Hytönen, E., & Aaltonen, O. (2008). Bioethanol from spruce bark: A concept study of a biorefinery process integrated into a Finnish pulp mill. 11th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2008, Prague, Czech Republic.