Title:
Fractional Condensation to Improve Bio-oil Quality From Pyrolysis of Acacia Longifolia
Author(s):
Marques, C.C., Santos, M.C., Nunes, M.I., Ribeiro, J.P., Sarinho, L., Matos, M.A.A., Tarelho, L.A.C.
Document(s):
Paper
Abstract:
This work investigated the bio-oils produced in a prototype auger reactor at 550ºC with a 5-minute solid residence time, comparing two condensation systems: a single temperature system at ˜3°C and a 4-temperature fractional system (T1=153.52 ± 4.99°C, T2=109.34 ± 6.26°C, T3=78.91 ± 5.23°C, and T4˜3°C). Despite differences in the number of aqueous and organic fractions collected, both systems produced similar total bio-oil yields (0.53-0.54 kg/kg biomass) and comparable organic (0.23-0.24 kg/kg bio-oil) and aqueous fractions (0.76-0.77 kg/kg bio-oil). Most bio-oil consisted of aqueous fractions. Organic fraction yields in the fractional system ranged from 0.048 to 0.079 kg/kg bio-oil, peaking at the highest temperature (˜153°C). In contrast, the single temperature system concentrated the organic fraction in the bottom layer. Organic fractions had lower water contents (<30% wt.) compared to aqueous fractions (>69% wt.). A trend in the fractional condensation system showed increasing water content with decreasing condensation temperature, except at T2 (˜109.34°C), where probably incomplete phase separation occurred. The organic fraction from T1 (˜153.52°C) had the highest HHV (29.95 MJ/kg), highest carbon content (0.66 kg C/kg), and lowest oxygen content (0.26 kg O/kg). Overall, a bio-oil fraction with clearly improved fuel properties, compared to organic fractions collected at the single-temperature system, was obtained through fractional condensation, but the small mass yield and the need for further upgrading highlight the need for more research to develop and optimize the bio-oil recovery system and assess the viability of this upgrading strategy.
Keywords:
biofuel, biomass, pyrolysis, pyrolysis bio-oil
Topic:
Biomass Conversion to Intermediate Bioenergy Carriers and Sustainable Biofuels
Subtopic:
Biofuels and renewable hydrocarbon biofuels
Event:
32nd European Biomass Conference and Exhibition
Session:
5BO.2.2
Pages:
625 - 630
ISBN:
978-88-89407-24-0
Paper DOI:
10.5071/32ndEUBCE2024-5BO.2.2
Price:
FREE
