Liquefaction of corn husks and properties of biodegradable biopolyol blends

Briones, Rodrigo; Rodríguez, Jesús López; Labidi, Jalel; Cunningham, Eoin; Martin, Peter

doi:10.1002/jctb.6458

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…Furthermore, the fact that after synthesis, the polyol was neutralized with NaOH in powder state might have also influenced this parameter. In any case, these values were lower than those presented by other authors [ 50 , 56 ]. This represented an advantage in the later production of polyurethanes in terms of processability.…”

Section: Resultscontrasting

confidence: 83%

Elaboration of Thermally Performing Polyurethane Foams, Based on Biopolyols, with Thermal Insulating Applications

De Hoyos-Martinez,

Mendez,

Martinez

et al. 2024

Polymers

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In this work, biobased rigid polyurethane foams (PUFs) were developed with the aim of achieving thermal and fireproofing properties that can compete with those of the commercially available products. First, the synthesis of a biopolyol from a wood residue by means of a scaled-up process with suitable yield and reaction conditions was carried out. This biopolyol was able to substitute completely the synthetic polyols that are typically employed within a polyurethane formulation. Different formulations were developed to assess the effect of two flame retardants, namely, polyhedral oligomeric silsesquioxane (POSS) and amino polyphosphate (APP), in terms of their thermal properties and degradation and their fireproofing mechanism. The structure and the thermal degradation of the different formulations was evaluated via Fourier Transformed Infrared Spectroscopy (FTIR) and thermogravimetric analysis (TGA). Likewise, the performance of the different PUF formulations was studied and compared to that of an industrial PUF. From these results, it can be highlighted that the addition of the flame retardants into the formulation showed an improvement in the results of the UL-94 vertical burning test and the LOI. Moreover, the fireproofing performance of the biobased formulations was comparable to that of the industrial one. In addition to that, it can be remarked that the biobased formulations displayed an excellent performance as thermal insulators (0.02371–0.02149 W·m−1·K−1), which was even slightly higher than that of the industrial one.

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Section: Resultscontrasting

confidence: 83%

Elaboration of Thermally Performing Polyurethane Foams, Based on Biopolyols, with Thermal Insulating Applications

De Hoyos-Martinez,

Mendez,

Martinez

et al. 2024

Polymers

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“…The first stage occurred between 100 and 300 °C due to the evaporation of water and low-molecular-weight compounds, and the defragmentation and degradation of the liquefied products [ 77 ]. The second stage took place at around 300–450 °C, where the liquefied products introduced by lignin and cellulose underwent further thermal decomposition [ 77 ]. Two main degradation peaks were observed for CLW and PLW, as shown in Table 4 .…”

Section: Resultsmentioning

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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“…3 Hydrothermal liquefaction (HTL) processing involves conversion of moisture-rich biomass feedstock at a high pressure range of 5-25 MPa and low-to-moderate temperature range of 280-375 °C in water to produce liquid product (biocrude), solid product (biochar) and gases. [4][5][6] Thereafter, the liquid product is separated by organic solvents having like polarity to desirable compounds expected in biocrude due to the insoluble nature of char in organic solvents. 7 The literature suggests that using water as well as organic solvents for liquefaction to obtain desirable biocrude is in increasing demand.…”

Section: Introductionmentioning

confidence: 99%

Solvothermal co‐liquefaction of wastes from Citrus limetta fruit processing

Acharya

Kishore

2023

J of Chemical Tech & Biotech

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BACKGROUND: Liquefaction of biomass has an advantage over other thermochemical processes of conversion and its co-liquefaction aims to overcome the restrictions and limitations imposed upon single feedstock liquefaction. Valorization of Citrus limetta peel and pulp wastes by their co-liquefaction in a hydrogen-donor solvent such as methanol was chosen as an objective herein for efficient conversion of raw materials to obtain better quality biocrude.RESULTS: A maximum biocrude yield of 11.25 wt. % was obtained from solvothermal co-liquefaction of Citrus limetta peel and pulp biomasses at 260 °C temperature, with 30 min residence time, at three different ratios of biomass to solvent (1:2, 1:3 and 1:4). This was higher than the biocrude yield from liquefaction of individual C. limetta pulp biomass as well as other studies on similar citrus fruit wastes. The higher heating value (HHV) of biocrude was raised to 25.72 MJ kg −1 at 1:3 biomass:solvent ratio by co-liquefaction, showing its synergy over individual C. limetta peel biocrude. The presence of esters, ketones, alcohols, hydrocarbons and fatty acids in the biocrude product were found from Gas Chromatography-Mass Spectrometry (GC-MS) results. The biochar obtained was mesoporous in nature and could be employed for adsorption in bioremediation of water and soil.CONCLUSION: Co-liquefaction of homogeneous lignocellulosic biomasses have the ability to boost production and the quality of the biocrude and biochar attained in comparison to products of individual liquefaction. Future studies on upgrading the quality of products are required.

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Liquefaction of corn husks and properties of biodegradable biopolyol blends

Cited by 9 publications

References 29 publications

Elaboration of Thermally Performing Polyurethane Foams, Based on Biopolyols, with Thermal Insulating Applications

Elaboration of Thermally Performing Polyurethane Foams, Based on Biopolyols, with Thermal Insulating Applications

Preparation of Polyurethane Adhesives from Crude and Purified Liquefied Wood Sawdust

Solvothermal co‐liquefaction of wastes from Citrus limetta fruit processing

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