178 results about "Lignocellulosic biomass" patented technology

The invention relates to the technical field of mesoporous carbon material preparation, in particular to a high-temperature mesoporous carbon preparation method which comprises the following steps: S1, mixing a metal halide and an inorganic hydrogen bond donor, and heating and stirring until a solution is clear to obtain an inorganic eutectic solvent; s2, mixing the inorganic eutectic solvent and a biomass raw material for reaction; s3, filtering and washing the material obtained in the step S2; and S4, carbonizing the material obtained in the step S3 in a high-temperature inert atmosphere to obtain the high-temperature mesoporous carbon. According to the method, the wood fiber biomass such as the lowest-value straw, the lowest-value bamboo and the lowest-value wood dust is directly used as raw materials, component separation does not need to be conducted on the wood fiber biomass, and high-value utilization of a large amount of low-value wood fiber biomass can be achieved. The method is relatively simple in process, relatively mild in condition and relatively high in product yield, and an activating agent does not need to be used. The biomass mesoporous carbon prepared by the method also has a high specific surface area in a huge mesoporous volume state, and the specific capacitance in an alkaline electrolyte exceeds 260F / g.

The present disclosure relates to processes for producing hydrocarbon fuels from lignocellulosic biomass. A process may include introducing biomass to a pretreatment system, and a first separation system forming a pentose-rich stream and a pentose-lean stream. The pentose-lean stream may be introduced to a hydrolysis system forming a hydrolysate and the hydrolysate introduced to a second separation system forming a hexose-rich stream and a lignin stream. Additionally, at least one of the pentose-rich stream or the hexose-rich stream may be introduced to a bioreactor containing microorganisms configured to produce hydrocarbon fuels. Additionally, the present disclosure also relates to systems for the production of hydrocarbon fuels. A system may include a pretreatment system, a first separation system, a hydrolysis system, a second separation system, and one or more bioreactors. Alternatively a system may include a pretreatment system, a hydrolysis system, a sugar separation system, and one or more bioreactors.

The invention relates to a lignocellulose biomass glucose production prediction method based on machine learning, and aims to improve the yield of glucose and optimize a biomass conversion process. According to the method, machine learning models such as a multi-layer perceptron, support vector regression, a random forest, a gradient boosting decision tree and a convolutional neural network are adopted to predict the LCB glucose yield processed by different preprocessing modes. Experimental results show that the convolutional neural network model is optimal in performance, the decision coefficient Rreaches up to 0.95, and the method has excellent generalization ability and prediction precision. The prediction precision is remarkably improved by feature extraction and principal component analysis in the model establishment process, and the Rof the convolutional neural network model is improved from 0.76 to 0.95. The efficient and accurate prediction method is provided for optimization of the biomass saccharification process, the method can be widely applied to the field of biological energy, and technical support is provided for improving the resource utilization efficiency of lignocellulose biomass.

The invention relates to the technical field of fractionation of lignocellulose biomass, and discloses a method for fractionating lignocellulose biomass by using a eutectic solvent, which comprises the following steps: mixing betaine and malic acid, stirring, and cooling to room temperature after the reaction is finished to obtain a clear and transparent eutectic solvent; the method comprises the following steps: mixing crushed lignocellulose biomass with a deep-eutectic solvent, and putting the mixture into a high-pressure reaction kettle; acetone and n-butyl alcohol are mixed according to the volume ratio of 3: 2-4: 1, and an anti-solvent is prepared; the method comprises the following steps: slowly adding an anti-solvent into a mixture of the lignocellulose biomass and the eutectic solvent, carrying out ultrasonic treatment, and then carrying out suction filtration. The glass electrode pH meter is used for measuring the pH value of the recovered deep-eutectic solvent, and the newly prepared deep-eutectic solvent is added according to the pH value, so that the stability of the solvent performance can be effectively maintained, the deep-eutectic solvent always keeps a good fractionation effect in multiple times of recycling, the utilization rate of the solvent is greatly improved, and the production cost is reduced.

A method for extracting lignin from lignocellulosic biomass using a non-choline chloride based natural deep eutectic solvent (NADES) formed from Citric Acid (CA) and Fructose (Fr) comprises mixing the biomass with the NADES, obtaining a lignin-NADES suspension, lyophilizing, rehydrating, and drying the suspension, and repeating the rehydration and drying steps to obtain lignin particles. The biomass used can be Ghaf biomass waste. The NADES preparation includes adding distilled water to reduce viscosity, mixing CA and Fr with distilled water in specific molar ratios of CA:Fr:distilled water of: 1:1:1, or 3:1:1, or 5:1:1, adjusting pH, stirring, and heating. The method also includes specific conditions for mixing, stirring, heating, and terminating the reaction. The lignin-NADES suspension is obtained through vacuum filtering and lyophilized by vacuum freeze-drying. The method avoids the use of acid-precipitation techniques, ensuring an efficient and environmentally friendly lignin extraction process.

The invention provides a saccharification method of lignocellulose biomass, which comprises the following steps: (1) mixing and homogenizing lignocellulose biomass and alkali liquor, and carrying out microwave treatment to obtain a pretreated material; and (2) adding cellulase to carry out an enzymolysis reaction, and carrying out solid-liquid separation to obtain an enzymolysis sugar solution of the lignocellulose biomass. According to the method, alkali treatment and microwave treatment are combined, a physical barrier of lignin wrapping cellulose is destroyed by alkali liquor, the internal structure of lignocellulose biomass is rapidly heated under the assistance of microwaves, damage to a lignin connecting structure is accelerated, lignin does not need to be stripped and removed, and the method is simple and convenient. The cellulose conversion rate and the saccharification recovery rate of the lignocellulose biomass can be obviously improved.

The invention provides a method for separating three major components of wood fiber biomass in one step by using a carbon dioxide-assisted two-phase solvent, and belongs to the technical field of lignocellulose treatment. The method comprises the following steps: placing an extraction solvent at the bottom of a reactor, and fixing a wood fiber biomass raw material at the upper part of the reactor; introducing carbon dioxide into the reactor, extracting under a closed condition, and introducing a cooling medium to adjust the temperature in the extraction process to obtain a solid-phase material, an organic phase and a water phase; the solid-phase material contains coarse cellulose, the organic phase contains lignin, and the water phase contains hemicellulose. The CO2 adopted by the method is non-corrosive, the aqueous solution of the CO2 is acidic, the generated H < + > can effectively promote the separation of wood fiber biomass components, and the CO2 can be recycled through pressure reduction and is circularly used for wood fiber raw material treatment.

The present disclosure generally relates to compositions and methods of simultaneously making two unique biointermediates from a single lignocellulosic biomass feedstock, including a hydrophobic biohydrocarbon and a water insoluble hydrophilic cellulosic biopolymer for use in the production of renewable fuels, chemicals, and other carbon neutral materials commonly derived from petroleum and other fossil resources.

The invention relates to a method for producing vanillin from natural lignocellulose biomass through co-culture of pichia pastoris, which comprises the following steps: respectively constructing a xylan hydrolysis recombinant strain (for releasing ferulic acid) and a vanillin synthesis recombinant strain (for converting ferulic acid) to realize conversion production from a natural xylan substrate to vanillin. In order to reduce the generation of by-products, 15 genes for coding aldehyde dehydrogenase (ALDRs), alcohol dehydrogenase (ADHs) and aldehyde ketoreductase (AKRs) are further knocked out from the vanillin synthesis recombinant strain, so that the vanillin can be further converted into the by-product vanillic acid, thereby improving the yield and purity of the vanillin.

The invention discloses a lignocellulose biomass-based hard carbon negative electrode material as well as a preparation method and application thereof. The method comprises the following steps: carrying out hydrothermal pretreatment on lignocellulose biomass by using low-corrosivity maleic acid, and regulating and controlling the composition of the lignocellulose biomass, the maleic acid and the lignocellulose to obtain a precursor rich in lignin and cellulose; in the pyrolysis and carbonization process, the thermal stability of the precursor is improved, and the lignin can more effectively inhibit the rapid concentrated pyrolysis of cellulose, so that the rearrangement of pyrolysis products is weakened. The method is beneficial for preventing overgrowth of hard carbon graphite microcrystals during high-temperature carbonization, so that the hard carbon material with large interlayer spacing and abundant small-size closed pores is prepared. The hard carbon material shows high specific capacity and excellent rate capability when being applied to the negative electrode of the sodium-ion battery. Meanwhile, xylose and furfural generated by decomposition of hemicellulose in a liquid phase can be effectively collected, and full-component utilization of biomass is achieved. The requirements of green production are met, and industrial application is easy to realize.

The present invention discloses a process for preparing lactic acid by mechanically enhanced ammonia method from straw-like biomass. The enzymatic hydrolysate of solid fibers obtained by the mechanically enhanced ammonia method from straw-like biomass is used as the carbon source of the fermentation medium in the process of fermenting lactic acid. The preparation of the carbon source in the fermentation medium comprises the following steps: S1: treating straw-like lignocellulosic biomass with a pretreatment liquid containing ammonia water and inorganic ammonium salts in a twin-screw device; S2: subjecting the obtained material to a heat preservation reaction, and after solid-liquid separation, obtaining solid fibers containing holocellulose; S3: enzymatically hydrolyzing the obtained solid fibers with Trichoderma reesei cellulase and xylanase, and performing solid-liquid separation, and the obtained supernatant is used as the carbon source in the fermentation medium for fermenting L-lactic acid. The present invention uses the sugar liquid obtained by enzymatic hydrolysis and saccharification of pretreated holocellulose, inoculates Bacillus coagulans to ferment L-lactic acid after supplementing nitrogen source and inorganic salts, and can greatly improve the concentration and conversion rate of L-lactic acid.

The invention discloses a method for preparing a supercapacitor carbon material through microalgae and biomass catalytic co-hydrothermal carbonization. The method comprises the following steps: S1) performing crushing, screening, washing and drying treatment on lignocellulose biomass and microalgae; s2) uniformly mixing the lignocellulose treated in the step S1), microalgae, a catalyst and water, performing hydrothermal reaction, and performing suction filtration and drying after the reaction is completed to obtain hydrothermal carbon; s3) performing uniform ultrasonic dispersion on the hydrothermal carbon obtained in the step S2) and an activating agent in an aqueous solution, and drying to obtain a solid mixture of the hydrothermal carbon and the activating agent; and S4) activating the solid mixture of the hydrothermal carbon and the activating agent obtained in the step S3) in an inert atmosphere, cooling and removing impurities to obtain a final product, namely the super-capacitor carbon material. Biomass and microalgae are adopted for catalytic co-hydrothermal carbonization, the yield and nitrogen content of hydrothermal carbon are improved at the same time, and the porous carbon material obtained after follow-up activation treatment has higher nitrogen content and pore structure, so that the porous carbon material has better electrochemical performance.

The invention relates to the technical field of environment-friendly adhesives, and particularly discloses a lignocellulose biomass all-component utilization adhesive as well as a preparation method and application thereof. Mixing lignocellulose biomass powder with the particle size of more than 100 meshes with the pretreatment liquid, stirring, washing with water, and filtering to obtain a pretreated raw material; mixing the pretreated raw material with a selective oxidant solution, stirring for reaction, washing with water, filtering and separating to obtain a precipitate; mixing the precipitate with a cross-linking agent solution, stirring for reaction, washing with water, and filtering to be neutral, so as to obtain the lignocellulose biomass all-component utilization adhesive. According to the invention, a certain component in the lignocellulose biomass is not separated, and the prepared adhesive has excellent adhesive property, water resistance and heat resistance, and is suitable for wood and bamboo processing and plate production. The invention not only provides an innovative thought for high-value utilization of agricultural and forestry wastes, but also points out a new direction for research and development of green adhesives, and is helpful for promoting development of environment-friendly materials.

The invention provides a production method of high-whiteness non-wood unbleached pulp. The production method of the high-whiteness non-wood unbleached pulp comprises the following steps: reacting a hydrogen bond donor with a hydrogen bond acceptor to obtain a ternary eutectic solvent; the method comprises the following steps: dispersing dried 60-80-mesh non-wood raw material powder into a ternary eutectic solvent, reacting, filtering, washing, dehydrating and drying to obtain the high-whiteness non-wood unbleached pulp. The green ternary eutectic solvent is adopted to treat non-wood raw materials to produce the high-whiteness unbleached paper pulp, and the production method is simple, low in cost, green, safe, efficient and suitable for industrialization; the obtained paper pulp has high whiteness without being bleached, and reliable guarantee is provided for chlorine-free bleaching of straw pulp and production of high-whiteness unbleached paper pulp; and the pulping by-product lignin can be effectively recovered, and a new strategy is provided for lignocellulose biomass refining.

The invention provides a preparation method of a hard carbon negative electrode material, which comprises the following steps: carrying out ball milling pretreatment on lignocellulose biomass powder to obtain powder A; mixing the powder A, a phenolic reagent and water, carrying out hydrothermal reaction at 105-185 DEG C, and carrying out cleaning, solid-liquid separation and drying on the obtained product to obtain a precursor B; and carbonizing the precursor B in a protective atmosphere to obtain the hard carbon negative electrode material. According to the preparation method, the derivative hard carbon with a rich closed pore structure, a disordered graphite-like microcrystalline structure and a relatively large carbon layer spacing can be obtained, and the hard carbon has excellent sodium ion storage and deintercalation capabilities and good structural stability, and has excellent cycle performance, initial coulombic efficiency, specific capacity and rate capability when being applied to a battery.

A low-cost process is provided to render lignocellulosic biomass accessible to cellulase enzymes, to produce fermentable sugars. Some variations provide a process to produce ethanol from lignocellulosic biomass (such as sugarcane bagasse or corn stover), comprising introducing a lignocellulosic biomass feedstock to a single-stage digestor; exposing the feedstock to a reaction solution comprising steam or liquid hot water within the digestor, to solubilize the hemicellulose in a liquid phase and to provide a cellulose-rich solid phase; refining the cellulose-rich solid phase, together with the liquid phase, in a mechanical refiner, thereby providing a mixture of refined cellulose-rich solids and the liquid phase; enzymatically hydrolyzing the mixture in a hydrolysis reactor with cellulase enzymes, to generate fermentable sugars; and fermenting the fermentable sugars to produce ethanol. Many alternative process configurations are described. The disclosed processes may be employed for other fermentation products.

The present invention belongs to the field of biomass utilization, and specifically relates to a method for preparing light aromatic hydrocarbons and monophenol products by using molecular sieves and seaweed charcoal for graded catalytic pyrolysis of biomass. The catalytic pyrolysis method of the present invention is to first use a zeolite molecular sieve catalyst to convert the volatile matter of biomass pyrolysis in a low temperature range into light aromatic hydrocarbons to a large extent, and then use a modified seaweed charcoal catalyst to convert the volatile matter of the pyrolysis residue in a medium temperature range into monophenol chemicals. The seaweed charcoal catalyst used in the present invention has high catalytic activity after activation treatment, and can realize the efficient conversion of lignocellulosic biomass into monophenol chemicals. Based on the idea of ​​graded catalytic pyrolysis, the present invention first uses zeolite molecular sieves to catalytically pyrolyze cellulose and hemicellulose in biomass, which solves the problem of poor pyrolysis effect of cellulose and hemicellulose in the process of catalytic pyrolysis of biomass, and then uses seaweed charcoal to catalytically pyrolyze lignin, thereby improving the utilization rate of bio-oil and realizing high-value conversion and utilization of all components of biomass.

Composite material in which some hydroxy groups of a lignocellulosic biomass are esterified, wherein the esterified section has short-chain acyl groups with 2 to 4 carbon atoms and long-chain acyl groups with 8 to 18 carbon atoms.

The present invention provides a composition comprising cellulose nanofiber and lignin or a complex thereof for efficiently utilizing lignocellulosic biomass without a residue, and a method for efficiently producing a lignocellulose-derived material from lignocellulosic biomass. The present invention relates to a composition comprising cellulose nanofiber having a sulfate group and a lignin-derived substance, and a method for producing a lignocellulose-derived material.

This disclosure provides formulations and processes that reduce the injection molding cycle times for poly(hydroxyalkanoate) blends which may contain a succinate polymer such as poly(butylene succinate), a filler such as lignocellulosic biomass and other additives. Blending of PHA with the second polymer may increase biodegradability and compostability.

The invention discloses a method for hydrolyzing and saccharifying wood fiber biomass. The method is characterized by comprising the following steps: (1) washing and drying materials; (2) crushing the materials; (3) preparing a material pretreatment solvent; (4) delignification of the material in a pretreatment solvent; (5) filtering the reaction liquid at normal temperature and normal pressure to separate liquid from solid to obtain cellulose; and (6) adding cellulose and polypeptide into deionized water according to a ratio of 2: 1-1: 2 in a solid-to-liquid ratio of 1: 50-1: 100, adding a NaOH solution to adjust the pH value of the solution to 3-8, and reacting at 40-95 DEG C under the protection of nitrogen for 6-16 hours to obtain the product glucose.

The invention discloses a preparation method of a porous capacitor material rich in heteroatom doping. The preparation method comprises the following steps: uniformly mixing lignocellulose biomass and microalgae, and then carrying out a co-pyrolysis carbonization reaction; and carrying out activation and plasma doping modification on the co-pyrolysis biochar prepared by the co-pyrolysis carbonization reaction. According to the method disclosed by the invention, the microalgae can fully realize self-doping of a nitrogen element, and the lignocellulosic biomass provides a rich carbon-based framework, so that the prepared biochar contains more void structures and nitrogen-containing functional groups; meanwhile, the lignocellulose biomass and microalgae co-pyrolysis charcoal are further subjected to low-temperature plasma doping modification, so that the amount of heteroions introduced to the surface of the co-pyrolysis charcoal is synergistically increased, a certain defect structure is further formed on the surface, and an oxidation-reduction reaction is facilitated; the co-pyrolysis biochar modified by microalgae and NH3 has the lowest contact resistance and the most excellent double-electric-layer capacitance characteristic, and the specific capacitance reaches up to 216 F / g.

The invention relates to the treatment of lignocellulosic biomass: a) a pre-treatment step (2) to obtain pre-treated biomass (3), b) a first solid / liquid separation step of solid / liquid separation of the pre-treated biomass (3) obtained in step a) into a first solid fraction (7) of the pre-treated biomass and a first liquid fraction (6) comprising a compound mixture, the present invention relates to a method for preparing a biomass solid fraction (7), comprising the steps of: a) pre-treating a compound mixture comprising C5 and C6 sugars in part in monomeric form and in part in oligomeric form, c) a first enzymatic hydrolysis step (14) of a first pre-treated biomass solid fraction (7) obtained in step b) to obtain a hydrolysis product (15) in sugar form, d) a step (24) of treating the first liquid fraction (6) obtained in step b) by hydrolysis, e) a second enzymatic hydrolysis step (24) of a second pre-treated biomass solid fraction (7) obtained in step b) to obtain a hydrolysis product (15) in sugar form, and d) a third enzymatic hydrolysis step (24) of the second pre-treated biomass solid fraction (7) obtained in step b). To obtain a treated fraction enriched in monomeric form of C5 sugars and / or monomeric form of C6 sugars (26).

The present disclosure provides genetically engineered microorganisms for the simultaneous fermentation of pentose and hexose sugars, for example, glucose and xylose. The microorganisms can be modified to express AtSWEET polypeptides, LST1 polypeptides, mutants thereof, homologs thereof or combinations thereof. Also provided are methods of co-fermenting hexose and pentose sugars, methods of increasing the conversion of lignocellulosic biomass via microbial fermentation, and methods of generating biofuel.

Provided is a method for producing a decomposition product from lignocellulosic biomass, the method comprising a step for heating the lignocellulosic biomass at a temperature of 250°C to 500°C inclusive in the presence of a metal element catalyst. The step is performed in the absence of hydrogen at atmospheric pressure or reduced pressure, and the decomposition product contains at least one selected from the group consisting of an aromatic monomer and a product gas.

The present invention demonstrates the ability of NADES to extract natural products from plant biomass, for example, one can use corn husk, a common agricultural residue, as a promising lignocellulosic biomass resource for biofuel and biomaterial production. Corn husk is composed of three main components: lignin, cellulose, and hemicellulose with lignin acting as a natural shield, surrounding and protecting the cellulose fibers with its complex, water-insoluble structure. The NADES disclosed explores compositions that make access to the valuable cellulose a reality that can be used for further processing. The currently disclosed process is superior because it has fewer environmental impact and toxicity issues due to the less harsh chemicals involved. The compositions and process demonstrate the potential of NADES as a more sustainable alternative to NaOH and Na2S in the pulping process using NADES, which are formed by combining readily available and inexpensive chemicals, creating a solvent with unique properties.

Feedstock including an amphiphilic lignocellulosic biomass can be processed using enzymes prior to pulping. The enzymes break down the biomass by disrupting the surface or cell walls or by reducing wax or other components. Such enzymes include cellulases, hemicellulases, laccases, peroxidases, and pectinases. Suitable enzymes can be obtained from secretions of microbes in soil organic matter from soil in which the feedstock was grown. If the pulping process includes steam explosion, such enzy matic processing of a biomass prior to steam explosion will increase absorption of water by the processed feedstock. In steam explosion, due to the increased ability of the processed feedstock to absorb water, steam explosion is more effective in breaking apart the processed feedstock. For other pulping processes, such enzymatic treatments break down the biomass, enabling extraction of the desired components from the processed feedstock through subsequent processing using less energy and fewer chemicals.

A method of digesting lignocellulosic material includes mixing lignocellulosic material comprising lignocellulosic biomass, a polymeric naphthalene sulfonate, sodium xylene sulfonate, and a white liquor comprising sodium hydroxide and sodium sulfide to form a mixture. In addition, the method further includes heating the mixture to digest at least a portion of the lignocellulosic material.

The present invention relates to the field of extraction of lignin wherein lignin is separated into a primary lignin. In one aspect, the present invention concerns a method to extract a primary lignin from lignocellulosic biomass comprising lignin. By providing a lignocellulosic biomass and a mixture of water and alcohol in a reactor, maintaining a temperature between 110°C and 180°C in the reactor to allow at least a part of the lignin to be dissolved to form an extract. Adding water to the removed extract to allow a part of the dissolved lignin to precipitate forming a primary lignin and separate it from the solution. In another aspect, the present invention concerns an isolated lignin obtained by the method as a primary lignin.

The invention relates to a method for treating lignocellulosic biomass, comprising: b) a step of acidic or neutral pretreatment of the biomass to produce an acidic or neutral pretreated biomass, which is carried out alternately with b1), b1) a step of alkaline pre-treatment of the biomass in advance under acidic, neutral or alkaline conditions to produce an alkaline pre-treated biomass, followed by c) a step of enzymatic hydrolysis of the acidic pre-treated biomass and / or the alkaline pre-treated biomass to obtain a hydrolyzed biomass, d) a step of solid / liquid separation of the hydrolyzed biomass in sugar form obtained at the end of step c) or a step of solid / liquid separation of the hydrolyzed biomass in sugar form obtained at the end of step c) and then treated in a step following enzymatic hydrolysis of step c), to obtain separated juice and unconverted solid residues, e) a step of recycling said solid residue to the alkaline pretreatment step b ').