Thermal liquefaction of olive tree pruning waste into bio-oil in water and ethanol with NaOH catalyst

Research studies for cellulose recovery from lignocellulosic materials are essential in order to propose sustainable alternatives to harness residual biomasses, solving problems caused by their abundance and inadequate use. In this study, olive-tree pruning biomass has been subjected to different pretreatments with different organosolvents (acetone, ethanol, and γ-valerolactone) with microwave radiation assistance. The effect of operating parameters has been studied, considering specific ranges of variables values according to each experimental design but, in any case, located in the ranges of 33–67% (chemical compound concentration), 130–170 °C (temperature), 5–30 min (reaction time), and 1/20–1/5 (solid/liquid ratio, s/L). Based on the R2 and R2adj values (mostly above 0.97), the experimental data were adequately adjusted to four selected response variables: post-solids cellulose and lignin content apart from removal percentages of both structural components. The optimization process resulted in post-treatment solids with meaningful cellulose yields (higher than 84.7%) and reduced lignin content (lower than 4.2%). The best results were obtained using 66.5% acetone (155 °C, 8.4 min and s/L = 1/19), involving greater material deconstruction, a high percentage of delignification (96.7%), not very significant cellulose loss (29.4%), and a post-treatment solid consisting almost exclusively of cellulose (≈99%).

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Sawdust Liquiefaction Over Schungite-Based Catalyst

Stepacheva,

Markova,

Manaenkov

et al. 2024

SGEM International Multidisciplinary Scientific GeoConference� EXPO Proceedings

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The deep processing of lignocellulose feedstock (including waste from the woodworking industry, agriculture, and agro-industry) allowing the high-added value products to be obtained is one of the key scientific problems. Lignocellulose biomass is a potential feedstock for the production of heat, electricity, fuel, chemicals, and other bioderived products. The liquefaction is considered to be one of the most promising ways to convert lignocellulose biomass into liquid fuels. During the liquefaction, lignocellulose biomass can be efficiently converted into important base compounds, such as furfural, 5-hydroxymethylfurfural, levulinic acid and its esters, ?-pentylactone, alkyl glycosides, and phenols. The search of effective catalysts for liquefaction is the main task for the development of the technology for obtaining liquid fuels from biomass. In this work, the liquefaction of the wood waste in the presence of a heterogeneous catalyst was studied. The novel Ni-containing catalyst supported on the natural carbonaceous material was used in this work. The influence of the reaction parameters on the biomass conversion, and product yield was estimated. The effect of the solvent, reaction temperature, hydrogen pressure, and preliminary treatment of biomass was analysed. It was shown that the developed catalyst allows the feedstock conversion to be about 90 wt. % for the non-hydrolysed sawdust. The preliminary hydrolysis of the feedstock increased the conversion up to 95 wt. %. The composition of the liquid products were presented by the products of the hydrolysis of cellulose, hemicelluloses, and lignin, as well as the polyols, 5-hydroxymethylfurfural, aromatics, and cyclic compounds.

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Thermal liquefaction of olive tree pruning waste into bio-oil in water and ethanol with NaOH catalyst

Cited by 3 publications

References 60 publications

Alkaline tetrahydrofurfuryl alcohol pretreatment technology to achieve value-added co-liquefaction of biomass

Alkaline tetrahydrofurfuryl alcohol pretreatment technology to achieve value-added co-liquefaction of biomass

Optimization of Microwave-Assisted Organosolv Cellulose Recovery from Olive-Tree Pruning with Three Different Solvents

Sawdust Liquiefaction Over Schungite-Based Catalyst

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