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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"organosolv"”.
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Adsorption and membrane filtration for the separation and valorization of hemicellulose from organosolv beechwood hydrolyzates
The sustainable use and conversion of biomass for the production of energy, fuels, and chemicals can help to counteract the declining availability of fossil resources and increasing climate change. In biorefineries, woody raw materials are fractionated into their three main constituent’s cellulose, …
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Pretreatment Methods for the Efficient Conversion of Soybean Products to Bioethanol
… studied the use of ionic liquids (ILs), an organosolv fractionation, CO<sub>2</sub>-saturated water, 0.5% glycerol, and 1% glycerol as green pretreatment methods for the conversion of soybean meal, flakes, and hulls into fermentable sugars needed for bioethanol production. The ILs …
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Vanadium-Catalyzed Aerobic Oxidation of Diols and Lignin Models/Extracts
… of lignin models and the depolymerization of organosolv lignin. These new catalysts overcome the need for added base, display higher reaction rates of oxidation, and improve the selectivity for the disassembly of lignin models. The different selectivities involving C-H vs. C-O vs. C-C bond …
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Lignin valorization
… and Ba(OH)2 as base and by an acid-catalyzed organosolv process. Moreover, lignin was isolated from bamboo, beech wood and coconut by soda treatment of the biomasses. A comparison of the structural features of such isolated lignins was performed through the use of a wide range of analytical …
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Biofuels from lignin and novel biodiesel analysis
… and aryl-O-aliphatic linkages of ethanol organosolv lignin to convert it from a low grade fuel to potential fuel precursors or other value added chemicals. The experimental data demonstrated that aryl-O-aryl and aryl-O-aliphatic linkages could be cleaved and the hydrogenated lignin had a …
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Synergistic coordination of oxygen functional groups with catalyst surface promotes hydrogenolysis of lignin model compounds
… at the a position, a common reaction during organosolv lignin extraction, allows the β–O–4 reaction to proceed, indicating the presence of an α–O functional group in the substrate is essential to facilitate β–O–4 cleavage. While not essential, the phenolic group in the lignin substrate …
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Improving the bioconversion of lignocellulosic feedstock to bio-fuels and chemicals
… high quality lignin was obtained in an Organosolv lignin-extraction procedure. FT-IR profile show less contamination of polysaccharides and proteins in the lignin extracted from the enzymatically enhanced acidogenic fermentation. An evaluation of the economic viability of the …
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Effects of the Non-ionic Surfactant Tween 80 on the Enzymatic Hydrolysis of Model Cellulose and Lignocellulosic Substrates
… lignin substrates, prepared from kraft lignin, organosolv lignin, and milled wood lignin. Cellulases appeared to adsorb onto the lignin substrates via both hydrophobic and polar interactions. Tween 80 molecules on the lignin substrates seemed to hinder cellulase adsorption via hydrophobic …
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Secondary interactions in blends of lignin and cellulose derivatives: composite morphology and properties
… of blends prepared from the unmodified organosolv lignin with ethyl cellulose and a cellulose acetate/butyrate ester confirms the minimal role of secondary interactions between components. However, the characteristics of the second phase suggest that the formation of liquid crystal …
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Comprehensive Structural and Thermal Characterization of Selected Grass Lignins
… and miscanthus lignin (MSL) were isolated by an organosolv method with 90% extraction yields. Differential scanning calorimetry analysis show SGL had the highest glass transition temperature at 50.5ºC, PCGL had the highest melting temperature at 70.4ºC, and PCGL and SGL had the highest …
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Bio-inspired Cellulose Nanocomposites
… at differing pH levels. Adsorption studies with organosolv lignin in an organic solvent, and spectroscopic analysis of mixtures of cationic polymer with alkali lignin revealed a non-covalent interaction. The work demonstrated how noncovalent interactions could be exploited to molecular organize …
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Renewable Natural Polymer Thin Films and Their Interactions with Biomacromolecules
… of dehydrogenative polymer (DHP), kraft (KL), organosolv (OL) and milled wood (MWL) lignins were used to study the enzymatic degradation of lignin mediated by lignin peroxidase (LiP) and manganese peroxidase (MnP). Results from QCM-D showed that the initial rates for degradation catalyzed by …
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Biomass pretreatment toward efficient hydrolysis for sustainable biofuel applications
… studied include dilute acid, alkaline, and organosolv processes. Inspired by the rapidly growing green solvent ionic liquid (IL) researches in biomass pretreatment, substituted imidazoles have been investigated in this thesis to assess their potential as pretreatment agents for …
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Integration of Extrusion and Clean Fractionation Processes as a Pretreatment Technology of Lignocellulosic Biomasses
… focuses on clean fractionation, which is organosolv treatment applied to raw and extruded prairie cordgrass, switchgrass and com stover. The goal of these experiments was to examine the clean fractionation process as a pretreatment method for lignocellulosic biomass and its effectiveness …
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Modeling Solvent Extraction of Lignin from Hardwoods
<p>This study interprets the observed behavior of solvent extraction of lignin from hardwoods by adapting the framework of the FLASHCHAIN theory (Niksa and Kerstein, 1991; Niksa, 2017). A constitution submodel specifies distributions of molecular weight and reactive sites for native lignin. The …
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ΜΕΛΕΤΗ ΤΟΥ ΜΗΧΑΝΙΣΜΟΥ ΠΡΟΚΑΤΕΡΓΑΣΙΑΣ ΓΙΑ ΤΗΝ ΜΕΤΑΤΡΟΠΗ ΤΗΣ ΒΙΟΜΑΖΑΣ ΣΕ ΚΑΥΣΙΜΑ ΚΑΙ ΧΗΜΙΚΑ: ΕΠΙΔΡΑΣΗ ΣΤΗ ΣΤΕΡΕΑ ΦΑΣΗ
THE EFFECTS OF PHYSICAL AND CHEMICAL PRETREATMENTS ON THE PARTICLE SIZE, SPECIFIC SURFACE AREA, CRYSTALLINITY INDEX, CHEMICAL COMPOSITION, DENSITY OF WHEAT STRAW IS EXAMINED. THE PHYSICAL PRETREATMENTS STUDIED WERE HAMMER - AND BALL-MILLING. THE CHEMICAL PRETREATMENTS UTILIZED WERE DELIGNIFICATIONS …