Species Effects on Wood-Liquefaction in Polyhydric Alcohols

Kurimoto, Yasuji; S, Doi; Tamura, Y

doi:10.1515/hf.1999.102

Cited by 121 publications

(80 citation statements)

References 7 publications

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“…Soares et al (2014) suggested that condensation reactions occurred at the higher reaction temperatures with the small percentage of glycerol (10%) used in their study. Kurimoto and Tamura (1999) proposed that re-condensation only happens when both the cellulose and the lignin are liquefied; however, they also proposed that this reaction can be inhibited by the addition of lowmolecular weight glycols, such as glycerol. The use of glycerol limits the re-condensation reactions and at the same time lowers the cost of the process since glycerol is a less expensive chemical than other polyalcohols.…”

Section: Cork Liquefactionmentioning

confidence: 99%

“…Under these conditions, biomass liquefaction with polyhydric alcohols, such as glycerol, ethylene glycol, or polyethylene glycol (PEG) (Kurimoto and Tamura 1999;Yamada and Ono 2001;Niu et al 2011;Martins et al 2013) affords large molecules that can be subsequently polymerized to produce adhesives, plastics, or other polymers Zhang et al 2007;Lin et al 2014). The choice of biomass liquefying solvent, as well as the catalyst (e.g., acid, base or other cyclic carbonates), will influence the composition of molecules extracted (Xie and Chen 2005).…”

Section: Introductionmentioning

confidence: 99%

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Cork Liquefaction for Polyurethane Foam Production

et al. 2017

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aCork is one of the most important forest products in Portugal. The cork processing industry is highly resource-efficient, and the only residue is cork powder, which is too small for agglomerate production. This work studied the usage of cork powder for the production of added-value products via polyol liquefaction. Liquefactions were performed in a reactor using a mixture of polyethylene glycol (PEG 400) and glycerol as solvents, which were catalyzed by the addition of sulphuric acid. Several cork-tosolvent ratios, reaction temperatures, and reaction times were tested. Polyurethane foams were prepared by combining polyol mixtures with a catalyst, surfactant, blowing agent, and polymeric isocyanate. Mechanical tests of the produced foams were conducted, and compressive modulus of elasticity and compressive stress at 10% deformation were determined. The results show that the best conditions for obtaining high liquefaction yields are as follows: 160 °C for 1 h; glycerol-to-PEG 400 ratio of 1:9; corkto-solvent ratio of 1:6; and 3% H2SO4 catalyst addition. The Fourier Transform Infrared (FTIR) spectra indicated that the lignocellulosic fractions of the cork were more selectively dissolved during acidified polyol liquefaction than the suberin. With liquefied cork powder using these optimized conditions, it is possible to produce polyurethane foams with desired properties.

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Section: Cork Liquefactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cork Liquefaction for Polyurethane Foam Production

et al. 2017

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“…It has been reported that the viscosity of the mixture obtained by traditional heating is as high as 270,000 Cp [15]. Compared to the traditional bath heating liquefaction, the viscosity of the liquefied mixture obtained by microwaveassistant liquefaction is lower by using the same acid as the catalyst, due to no wood solid residue remaining in the liquefied mixture.…”

Section: Properties Of the Liquefied Biomass-based Polyolsmentioning

confidence: 99%

Rapid Liquefaction of Wood in Polyhydric Alcohols Under Microwave Heating and its Liquefied Products for Preparation of Rigid Polyurethane Foam

Wang¹

2011

TOMSJ

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Comparing to the conventional bath heating, the effects of liquefaction parameters on the degree of liquefaction of wood in polyhydric alcohols by using microwave as an energy source were evaluated. Polyurethane foams were successfully prepared from the liquefied biomass-based polyols. The effects of heating methods (conventional bath heating and microwave) and liquefaction reaction time on the properties of liquefied biomass-based polyols were investigated. The influences of isocyanate index on the properties of rigid polyurethane foams were also discussed, and feasible formulations for preparing liquefied biomass-based polyurethane foams were proposed. The results indicated that rapid liquefaction of wood in polyhydric alcohols under microwave heating could be achieved. The foams prepared from liquefied biomass-based polyols obtained by microwave-assistant liquefaction exhibited excellent mechanical properties.

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“…In a similar study of liquefaction of wood, it was also suggested that the 9:1 PEG/gly ratio was optimal for some wood species (Kurimoto et al 1999). The wood-to-solvent mass ratio was 1:3, and the catalyst-to-solvent mass ratio was 3:100.…”

Section: Preparation Of Liquefied Woodmentioning

confidence: 96%

Preparation of Two-Component Polyurethane Coatings from Bleached Liquefied Wood

Cheumani-Yona

Budija²,

Hrastnik

et al. 2015

BioResources

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Liquefied wood-based polyurethane wood coatings of an aesthetically acceptable light colour were prepared and characterised. Liquefied black poplar wood was obtained by solvolysis in a polyethylene glycol/glycerol mixture, and it was bleached with hydrogen peroxide. The bleaching treatment converted liquefied wood from a dark brown to a yellowish product. Polyurethane films were prepared by the curing of liquefied wood with polymeric diphenylmethane diisocyanate or trimethylolpropane toluene diisocyanate prepolymer (TMP/TDI) isocyanate-type hardeners. It was found that the selected properties of the films prepared from the bleached liquefied wood were, in general, equivalent to those prepared from unbleached liquefied wood. The mechanical properties of the films obtained with the TMP/TDI curing agent were acceptable for wood coating applications. The initial poor resistance of the films to water and ethanol was substantially improved by the addition of n-octyltriethoxysilane to the liquefied wood prior to the preparation of the polyurethane coatings; the hardness of the films also increased.

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Species Effects on Wood-Liquefaction in Polyhydric Alcohols

Cited by 121 publications

References 7 publications

Cork Liquefaction for Polyurethane Foam Production

Cork Liquefaction for Polyurethane Foam Production

Rapid Liquefaction of Wood in Polyhydric Alcohols Under Microwave Heating and its Liquefied Products for Preparation of Rigid Polyurethane Foam

Preparation of Two-Component Polyurethane Coatings from Bleached Liquefied Wood

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