Abstract
Fast pyrolysis of eucalyptus bark using a free-fall reactor integrated with an in-situ alcohol feeding unit was studied to investigate the effects of feeding positions (in-situ and external), alcohol types (ethanol and methanol) and alcohol content (5–30wt%) on bio-oil yield and properties. The results show that the bio-oil yield decreased with alcohol content from 60wt% (without alcohol) to 40wt% with 30wt% alcohol, whereas the gas yield increased and the char yield remained constant. In-situ addition of alcohol was more effective than external mixing in terms of bio-oil viscosity, stability, water content and pH. Feeding 5wt% alcohol into the process gave similar or better results than external mixing with 30wt% alcohol. Nearly 70% of the viscosity and 30% of the water content were reduced with 5wt% methanol added into the process. The heating value, specific gravity, ash and solids contents were similarly improved by the in-situ and external addition.
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