Modelling of pine wood sawdust thermochemical liquefaction

Braz, Ana; Mateus, Maria Margarida; Santos, Rui Galhano dos; Machado, R. A. F.; Bordado, João Moura; Correia, M. Joana Neiva

doi:10.1016/j.biombioe.2018.11.001

Cited by 30 publications

(34 citation statements)

References 16 publications

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“…These linkages are dominant in cellulose and hemicellulose structures. [7] This process is suitable for any biomass type, such as agriculture [6,[8][9][10], lignocellulosic biomass [11][12][13][14], sludges [15], and food waste [16][17][18]. Domingos et al [19] studied liquefied eucalyptus branches (Eucalyptus globulus).…”

Section: Introductionmentioning

confidence: 99%

Boosting the Higher Heating Value of Eucalyptus globulus via Thermochemical Liquefaction

Fernandes¹,

Matos²,

Gaspar³

et al. 2021

Sustainability

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Biomass can be envisaged as a potential solution to mitigate the problems that the extensive exploitation of fossil sources causes on the environment. Transforming biomass into added-value products with better calorific properties is highly desired. Thermochemical liquefaction can convert biomass into a bio-oil. The work herein presented concerns the study of direct liquefaction of Eucalyptus globulus sawdust. The main goal was to optimise the operating conditions of the process to achieve high bio-oil conversion rates. Studies were carried out to understand the impact of the process factors, such as the residence time, catalyst concentration, temperature, and the biomass-to-solvent ratio. The E. globulus sawdust conversion into bio-oil was achieved with a maximum conversion of 96.2%. A higher conversion was reached when the eucalyptus sawdust's thermochemical liquefaction was conducted over 180 minutes in the presence of a >2.44% catalyst concentration at 160 °C. A lower biomass-to-solvent ratio favours the process leading to a higher conversion of biomass into bio-oil. The afforded bio-oil presented a better higher heating value than that of E. globulus sawdust.

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Section: Introductionmentioning

confidence: 99%

Boosting the Higher Heating Value of Eucalyptus globulus via Thermochemical Liquefaction

Fernandes¹,

Matos²,

Gaspar³

et al. 2021

Sustainability

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“…LY is also influenced by many factors, such as biomass type, solvent and catalyst types, biomass to solvent ratio, catalyst concentration, temperature, and reaction time. It is generally accepted that the liquefaction of wood at a solvent to biomass ratio of 3:1 is most effective, while a lower ratio than 3:1 will lead to polyols with an extremely high viscosity [44,55]. CLW prepared with the highest LY of 99.7% and its purified derivative PLW were analyzed for their OH and acid numbers, viscosity, and pH values (Table 3).…”

Section: Liquefaction Yield and Polyol Characteristicsmentioning

confidence: 99%

Preparation of Polyurethane Adhesives from Crude and Purified Liquefied Wood Sawdust

et al. 2021

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Polyurethane (PU) adhesives were prepared with bio-polyols obtained via acid-catalyzed polyhydric alcohol liquefaction of wood sawdust and polymeric diphenylmethane diisocyanate (pMDI). Two polyols, i.e., crude and purified liquefied wood (CLW and PLW), were obtained from the liquefaction process with a high yield of 99.7%. PU adhesives, namely CLWPU and PLWPU, were then prepared by reaction of CLW or PLW with pMDI at various isocyanate to hydroxyl group (NCO:OH) molar ratios of 0.5:1, 1:1, 1.5:1, and 2:1. The chemical structure and thermal behavior of the bio-polyols and the cured PU adhesives were analyzed by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Performance of the adhesives was evaluated by single-lap joint shear tests according to EN 302-1:2003, and by adhesive penetration. The highest shear strength was found at the NCO:OH molar ratio of 1.5:1 as 4.82 ± 1.01 N/mm2 and 4.80 ± 0.49 N/mm2 for CLWPU and PLWPU, respectively. The chemical structure and thermal properties of the cured CLWPLW and PLWPU adhesives were considerably influenced by the NCO:OH molar ratio.

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“…Lignocellulosic biomass has been successfully liquefied and described by many authors (Alma et al, 2016; Jasiūnas et al, 2020; Jiang et al, 2020). Liquefied biomass products have a wide spectrum of applications and great potential as abundantly available natural feedstock to produce carbon/biochar‐based materials (Huang & Yuan, 2015) including activated carbon fibers (Ma et al, 2015, 2019), polyurethane foams (Čuk et al, 2015), for bioenergy production (Braz et al, 2019; Buffi et al, 2018; Fernández‐Delgado Juárez et al, 2020; Jayathilake et al, 2020), as a binder for wood‐based panels exploiting the residues of the wood industry including branches (Domingos et al, 2019), bark (Janiszewska, 2018; Jiang et al, 2018) and sawdust (Braz et al, 2019). Moreover, liquefied wood has been used as a testing material to evaluate the functioning of the original prototyping expert system for panels identification, supporting the quality control process on the production floor (Sandak et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Activated biochars derived from wood biomass liquefaction residues for effective removal of hazardous hexavalent chromium from aquatic environments

et al. 2021

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Residues obtained after wood biomass liquefaction were used as precursors for the synthesis of two activated biochars. The source of biomass liquefaction constituted of industrial wood processing by‐products, including bark and wood sawdust. The liquefied residues were analyzed in terms of chemical components and structure. Carbonization under nitrogen atmosphere followed by physical CO2 activation allowed to obtain microporous activated carbons with specific surface areas of 741 and 522 m2 g−1, and micropore volumes of 0.38 and 0.27 cm3 g−1, respectively. The obtained activated carbons were used to remove toxic hexavalent chromium from the aquatic environment. The observed sorption capacities were 80.6 mg g−1 versus 36.7 mg g−1 for wood bark‐derived and wood sawdust‐derived carbon, respectively, indicating a key role of the wood residue source in the effectiveness of Cr(VI) removal by resulting carbons. Despite the dominant microporous structure, the adsorption kinetics was surprisingly fast, especially for the bark‐derived carbon, since the adsorption equilibrium was reached within 2 h. The sorption mechanism of chromium was based on the carbon surface‐mediated reduction of toxic hexavalent form to its non‐toxic trivalent form, as confirmed by the X‐ray photoelectron analysis. Therefore, the residues from wood liquefaction can be easily converted into porous activated biocarbons capable of adsorbing significant amounts of hazardous Cr(VI) while reducing them to non‐toxic Cr(III).

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Modelling of pine wood sawdust thermochemical liquefaction

Cited by 30 publications

References 16 publications

Boosting the Higher Heating Value of Eucalyptus globulus via Thermochemical Liquefaction

Boosting the Higher Heating Value of Eucalyptus globulus via Thermochemical Liquefaction

Preparation of Polyurethane Adhesives from Crude and Purified Liquefied Wood Sawdust

Activated biochars derived from wood biomass liquefaction residues for effective removal of hazardous hexavalent chromium from aquatic environments

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