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Desulfurization of kraft lignin
Wood Science and Technology, 2018Kraft lignin is a product of the sulfate pulping process. It usually contains 2–3% total sulfur. Sulfur content acts as deterrent to lignin use in some areas. Sulfur-free lignins are more versatile and can be heat-treated without the release of foul-smelling sulfur compounds.
Andrey N. Evdokimov +5 more
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Journal of Polymer Science Part C: Polymer Symposia, 1971
AbstractA series of high temperature hydrogenolyses‐hydrogenations of kraft lignin in water, organic solvents and aqueous alkali using a variety of catalysts were run. The liquefaction and distillation yields for the resulting products were measured.
J. D. Benigni, I. S. Goldstein
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AbstractA series of high temperature hydrogenolyses‐hydrogenations of kraft lignin in water, organic solvents and aqueous alkali using a variety of catalysts were run. The liquefaction and distillation yields for the resulting products were measured.
J. D. Benigni, I. S. Goldstein
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Similarities in Recalcitrant Structures of Industrial Non‐Kraft and Kraft Lignin
ChemSusChem, 2020AbstractThis work compares the structure of industrially isolated lignin samples from kraft pulping and three alternative processes: butanol organosolv, supercritical water hydrolysis, and sulfur dioxide/ethanol/water fractionation. Kraft processes are known to produce highly condensed lignin, with reduced potential for catalytic depolymerization ...
Andrew W. Tricker +9 more
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Modified kraft lignin for bioremediation applications
Journal of Environmental Science and Health, Part A, 2012Kraft lignin (KL) from industrial pulping of E. globulus wood was subjected to the oxidative modification with the aim to produce sorbent mimicking humic matter for the bioremediation purposes. Lignin was oxidized by polyoxometalate Na(5)[PMo(10)V(2)O(40)] (POM), solely or in the presence of laccase, under pre-selected aerobic conditions (50-60°C, 1-2h,
Santos, Diva A. Simões dos +2 more
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Methanol Fractionation of Softwood Kraft Lignin: Impact on the Lignin Properties
ChemSusChem, 2013AbstractThe development of technologies to tune lignin properties for high‐performance lignin‐based materials is crucial for the utilization of lignin in various applications. Here, the effect of methanol (MeOH) fractionation on the molecular weight, molecular weight distribution, glass transition temperature (Tg), thermal decomposition, and chemical ...
Tomonori, Saito +6 more
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Purification and characterization of kraft lignin
Holzforschung, 2015AbstractTo upgrade the utilization of kraft lignin (KL) for high-performance lignin-based materials (e.g., carbon fiber), the purity, molecular mass distribution (MMD), and thermal properties need to be improved and adjusted to target values. Therefore, different methods, such as ultrasonic extraction (UE), solvent extraction, dialysis, and hot water ...
Fang, W. +5 more
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Pyrolysis of Kraft Lignin with Additives
Energy & Fuels, 2011The pyrolysis of softwood (SW) kraft lignin in the presence of NiCl2 and ZSM-5 zeolite as an additive was examined at 700 °C. Gel permeation chromatography (GPC), quantitative 13C and 31P NMR were used to characterize the pyrolysis oil. Based on the results of 13C and 31P NMR for the pyrolysis oils, the use of zeolite during pyrolysis caused the near ...
Haoxi Ben, Arthur J. Ragauskas
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Surfactant properties of kraft lignins
Russian Journal of Applied Chemistry, 2007Formation of the adsorption layer at the solution-air interface is characterized by data on the surface tension in alkaline solutions of kraft lignins extracted from deresined spruce and birch wood. The effects of the lignin nature and solution concentration on intermolecular interaction in the surface layer are studied.
S. B. Selyanina +3 more
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Pyrolysis of a Precipitated Kraft Lignin
Industrial & Engineering Chemistry Product Research and Development, 1979A precipitated kraft lignin was pyrolyzed in a "captive sample" reactor at 400-700 °C for 10-120 s. Weight loss and tar were determined gravimetrically and oxides of carbon, hydrocarbons, methanol, acetone and single-ring phenols were determined by gas chromatography.
Iatridis, Basil, Gavalas, George R.
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The carboxymethylation of organosolv and kraft lignins
Wood Science and Technology, 1980Kraft and ethanol organosolv lignins from Picea abies and Fagus sylvatica were carboxymethylated with bromoacetic acid. Of the total hydroxyl groups in the lignins, 60–70% were carboxymethylated. The reaction led to an increase of the number-average molecular weights.
W. Lange, W. Schweers
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