Results 151 to 160 of about 6,331 (182)
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STUDIES ON LIGNIN AND RELATED COMPOUNDS: II GLYCOL-LIGNIN AND GLYCOL-ETHER-LIGNIN
Canadian Journal of Research, 1930The extraction of spruce wood meal with ethylene glycol in the presence of 0.05% HCl leads to the isolation of a lignin derivative to which the name glycol-lignin is given. If the monomethyl ether of glycol be substituted for the free alcohol, a glycol-ether-lignin is obtained which has a much higher methoxyl content than glycol-lignin. The product of
Harold Hibbert, Léo Marion
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STUDIES ON LIGNIN AND RELATED COMPOUNDS: IV. THE NITRATION OF GLYCOL-LIGNIN
Canadian Journal of Research, 1930Glycol-lignin at temperatures below 0 °C., dissolves completely in a mixture of four parts of acetic anhydride and one part of fuming nitric acid, giving rise to a 125% yield of a product (nitrated-lignin) which has undergone nitration and acetylation. The nitrogen in the product is present partly in the form of a nitro group, an ester of nitric acid,
Harold Hibbert, Leo Marion
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Thermolysis of glycol lignin in the presence of tetralin
The Canadian Journal of Chemical Engineering, 1993AbstractAn organosolv (ethylene glycol) hardwood lignin has been thermally treated in the presence of tetralin, a hydrogen donor solvent. The effects of reaction temperature and time on product distribution were studied as a function of a seventy index, Xc = ℓn (Rω with Rω = Δt t × exp [(Tr ‐ Tb)/ω] where Δt = time, Tr = reaction temperature, Tb = base
Ronald W. Thring +2 more
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STUDIES ON LIGNIN AND RELATED COMPOUNDS: XV. PHENOL GLYCOL LIGNIN
Canadian Journal of Research, 1935Phenol condensation products of glycol lignin, of a premethylated and a fully methylated glycol lignin have been prepared. In each case it has been found that, on the basis of the five methoxyl groups present in the original glycol lignin, three molecules of phenol react with one lignin unit by nuclear condensation, and when the product is worked up ...
Fritz Brauns, Harold Hibbert
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Characterization of lignin residues derived from the alkaline hydrolysis of glycol lignin
Canadian Journal of Chemistry, 1990Lignin residues from the alkaline hydrolysis of solvolytic lignin have been characterized by elemental analysis, size exclusion chromatography, Fourier transform infrared spectroscopy, 13C NMR, and for methoxyl content. All lignin residues were found to have higher carbon and lower oxygen contents than the original glycol lignin.
Ronald W. Thring +4 more
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STUDIES ON LIGNIN AND RELATED COMPOUNDS: IX. ETHERS OF GLYCOL-LIGNIN
Canadian Journal of Research, 1931Glycol-lignin prepared from spruce wood has been found to form a sodium salt which reacts with chloro-derivatives, giving rise to the corresponding glycol-lignin ethers. These compounds are insoluble in aqueous sodium hydroxide but still contain free hydroxyl groups which can be methylated without the ethereal linkage being broken. Hence glycol-lignin
Harold Hibbert, Léo Marion
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STUDIES ON LIGNIN AND RELATED COMPOUNDS: XIII. THE STRUCTURE AND PROPERTIES OF GLYCOL LIGNIN
Canadian Journal of Research, 1935Lignin was extracted from spruce wood meal with ethylene glycol containing (a) 0.05% and (b) 0.2% hydrogen chloride. On purification the two glycol lignins were found to contain 16.9% OCH3 and 62.8% C., and 16.5% OCH3 and 64.7% C. respectively. The aqueous glycol mother liquor was found to contain a soluble lignin-carbohydrate compound.
K. R. Gray +3 more
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Thermogravimetric analysis of glycol lignin fractions obtained by sequential solvent extraction
Fuel, 1993Abstract Data are presented on the thermal behaviour of a solvolytic lignin and its fractions during combustion and devolatilization in a thermal analyser.
Ronald W Thring +2 more
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Journal of Agricultural and Food Chemistry, 2012
Imidacloprid, a systemic insecticide that has a water solubility of 610 mg L(-1), has been formulated in lignin-polyethylene glycol matrices by a melting process. This formulation was coated in a Wurster type fluidized-bed equipment using ethylcellulose and dibutyl sebacate. Imidacloprid has been entrapped, with an entrapment efficiency higher than 87%
Francisco, Flores-Céspedes +5 more
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Imidacloprid, a systemic insecticide that has a water solubility of 610 mg L(-1), has been formulated in lignin-polyethylene glycol matrices by a melting process. This formulation was coated in a Wurster type fluidized-bed equipment using ethylcellulose and dibutyl sebacate. Imidacloprid has been entrapped, with an entrapment efficiency higher than 87%
Francisco, Flores-Céspedes +5 more
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ACS Sustainable Chemistry & Engineering, 2021
Recently, we have demonstrated the initial process design of acid-catalyzed poly(ethylene glycol) (PEG) solvolysis of softwood Japanese cedar (JC) in a large-scale batch reactor (50 kg wood meal pe...
Thi Thi Nge +6 more
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Recently, we have demonstrated the initial process design of acid-catalyzed poly(ethylene glycol) (PEG) solvolysis of softwood Japanese cedar (JC) in a large-scale batch reactor (50 kg wood meal pe...
Thi Thi Nge +6 more
openaire +1 more source