Influence of Temperature and Residence Time on Torrefaction Coupled to Fast Pyrolysis for Valorizing Agricultural Waste

Torrefaction is a promising pretreatment technology for valorizing biomass and upgrading pyrolysis products. This study sets out an original procedure consisting of subjecting the biomass to torrefaction before fast pyrolysis to increased value-added compounds based on agricultural waste biomasses p...

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Bibliographic Details
Published in:Energies (Basel) 2022-10, Vol.15 (21), p.7914
Main Authors: Alcazar-Ruiz, Angel, Dorado, Fernando, Sanchez-Silva, Luz
Format: Article
Language:English
Subjects:
Acetic acid
Agricultural wastes
almond shell
Biomass
Biomass energy
Carbon
Carboxylic acids
Cellulose
Chemicals
Composition
Decomposition
Drying
Experimental methods
fast pyrolysis
Fossil fuels
Lignin
Lignocellulose
Metals
Methods
olive pomace
Phenolic compounds
Phenols
Production processes
Pyrolysis
Pyrolysis products
Raw materials
residence time
Residence time distribution
temperature
torrefaction
Upgrading
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Summary:Torrefaction is a promising pretreatment technology for valorizing biomass and upgrading pyrolysis products. This study sets out an original procedure consisting of subjecting the biomass to torrefaction before fast pyrolysis to increased value-added compounds based on agricultural waste biomasses production. This study uses a combined biomass treatment consisting of torrefaction (280–320 °C) and subsequent fast pyrolysis (500 °C) using the same reactor. Under different torrefaction temperatures and residence times, olive pomace (OP) and almond shell (AS) have been evaluated. The study demonstrated OP rather than AS was thermally unstable. The highest total yield of carboxylic acids (mainly acetic acid) was obtained by means of torrefaction at 280 °C with a residence time of 20 s for OP, and at 300 °C and 20 s for AS. Higher torrefaction temperature and residence time promoted phenolic compounds production for OP. However, OP had a higher lignin content and inherent metals that promoted a catalytic reaction during the procedure. The highest yield (47.7%) was obtained using torrefaction at 320 °C with a residence time of 240 s. Overall, the torrefaction of biomass combined with fast pyrolysis constituted a very simple and efficient strategy for valorizing the conversion of agricultural waste biomass into value-added chemicals.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15217914