251 results about "Hemicellulose" patented technology

The invention discloses a method for preparing viscose fiber from alkali-soaked hemicellulose, and relates to the technical field of viscose fiber production and preparation, and the method comprises the following steps: sequentially carrying out multi-stage filtration and twice nanofiltration membrane filtration on alkali liquor squeezed from slurry porridge, and separating out high-concentration hemicellulose alkali liquor; after cellulose xanthate is generated through a xanthating machine reaction, high-concentration hemicellulose alkali liquor is added into the xanthating machine to be subjected to a xanthating reaction, and hemicellulose xanthate is generated; and adding dilute alkali liquor into the xanthating machine for dissolving, and sequentially filtering, defoaming and spinning to prepare the viscose fiber. After alkali cellulose and carbon disulfide are subjected to a yellowing reaction, high-concentration hemicellulose alkali liquor is added into a yellowing machine for secondary yellowing, then two xanthate esters are dissolved with dilute alkali liquor, and subsequent filtering, defoaming and spinning procedures are performed, so that full utilization of hemicellulose is realized, and the quality and spinnability of viscose fibers are guaranteed; meanwhile, pulp unit consumption and new alkali consumption are reduced, and the production cost is saved.

The invention provides an application of GH48 / GH57 / GH9 family genes carried by bacillus altitudinis H1 in improvement of corn straw rumen fermentation digestibility, and belongs to the technical field of degrading bacteria. According to the invention, a cellulose degradation strain H1 is separated and screened from a goat rumen content, and the preservation number of the strain is GDMCC No: 67152. The invention further discloses a preparation method of the cellulose degradation strain H1. An in-vitro fermentation experiment shows that the soluble carbohydrate content and the lignin content of the corn straw fermented by the H1 strain are remarkably reduced, the 48-hour gas production rate is remarkably reduced, and the propionic acid content is also remarkably reduced. The result shows that the H1 strain has stronger lignin decomposition capability and preferentially degrades hemicellulose and pectin. The H1 strain provided by the invention is proved to have a good corn straw degradation effect.

The application discloses a method for preparing a hard carbon negative material for a sodium ion battery by treating biomass by using a xylanase. The method uses biomass as a precursor, removes part of hemicellulose by using a xylanase, and then carbonizes to obtain a biomass-based hard carbon for a negative electrode of a sodium ion battery. The preparation method is simple, environment-friendly, non-toxic and harmless, and conforms to the green and sustainable development concept. The prepared hard carbon negative material exhibits excellent performance in the sodium ion battery.

The invention relates to a material, suitable for additive manufacturing and in particular for fused deposition modeling, wherein said composite material is obtained by fusion of at least two components: - at least one polymer matrix chosen among polyhydroxyalkanoates (PHA), and - at least one auxiliary filler chosen among biobased fillers consisting of biobased particles comprising lignin, cellulose and hemicellulose, wherein said biobased particles have a lignin / hemicellulose mass ratio from 1 to 6. The invention also relates to an additive manufacturing process and a product obtained by an additive manufacturing process.

The present application belongs to the technical field of fruit by-product processing, and particularly relates to a method for extracting cellulose, pectin and polyphenol from pear by-product. The present application utilizes the thermo-mechanical-chemical effect of steam explosion to treat the pear by-product through steam explosion, so that most of hemicellulose and lignin can be removed, and the cellulose, pectin and polyphenol can be efficiently and rapidly extracted, thereby shortening the production cycle of the cellulose, pectin and polyphenol and improving the efficiency. Furthermore, the present application uses a combination of choline chloride and ethanol as a low eutectic solvent, and compared with other types of hydrogen bond acceptors and hydrogen bond donors, the polyphenol extraction effect is the most significant. The present application provides a method for laying a foundation for further development and utilization of pear residue cellulose, pectin and polyphenol, and improves the comprehensive utilization rate of pear processing by-products.

The application relates to the technical field of biomass utilization, and relates to a continuous preparation technology of furfural from corncob, which comprises the following steps: S1: corncob is crushed into powder, then is mixed with sulfur trioxide, and is subjected to steam explosion under steam pressure; S2: acid catalysis-extraction reaction; S3: the once-extracted phase is subjected to solid-liquid separation, the liquid phase is subjected to secondary extraction by using an extracting agent, and a secondary extraction phase is obtained; S4: the once-extracted phase and the secondary extraction phase are combined and are sent into a rectifying tower for rectification, and furfural with a purity greater than 99% is obtained. The application has the beneficial effects that: 1. after the corncob is crushed, the corncob is mixed with sulfur trioxide and is subjected to steam explosion, hemicellulose can be effectively stripped from lignin, the subsequent reaction of preparing furfural from hemicellulose by acid catalysis can be more easily carried out, and the yield is higher; 2. in the method, acetic acid and aluminum chloride are used as mixed acid catalysts, the reaction temperature is reduced by 20-40 DEG C compared with one-pot method, and the reaction pressure is reduced by 0.4-0.7 MPa.G compared with one-pot method, so that the requirement of the reaction on equipment is reduced.

The invention provides a method for preparing furfural and co-producing activated carbon from oil-tea camellia fruit cattail, which comprises the following steps: hydrolyzing hemicellulose in the oil-tea camellia fruit cattail by adopting Bronsted acid to directionally convert the hemicellulose into xylose, and further converting the xylose into furfural by utilizing Lewis acid; the influence of process parameters such as reaction temperature, reaction time, acid type, acid concentration and immobilization rate on the furfural yield is systematically investigated. And after the reaction is finished, filtering to obtain solid residues, and further preparing the camellia oleifera fruit and cattail activated carbon by adopting chemical activation and calcination methods. Adsorbing and purifying furfural by using the obtained activated carbon, and analyzing to obtain a furfural product. According to the method for preparing furfural and co-producing activated carbon from the oil-tea camellia fruit cattail, high-value conversion of hemicellulose in the oil-tea camellia fruit cattail and gradient utilization of solid residues are achieved, a closed-loop process path for full utilization and collaborative optimization of the oil-tea camellia fruit cattail is constructed, and the whole process is green and free of'three wastes' emission.

The application discloses a preparation method of organic garbage carbon source by composite enzyme combined with nitrogen precipitation. Firstly, enzyme pretreatment is performed on organic garbage materials, starch enzyme, cellulase and hemicellulase are used in cooperation to make macromolecular structure of organic matter be broken, so that preliminary release and partial dissolution of carbon source substances are realized; subsequently, sodium tetraphenylborate is added in the pretreatment system to selectively precipitate nitrogen substances in the solution, and centrifugal separation is performed to reduce nitrogen content of the system; on the basis, potassium persulfate and iron substances are added into the obtained suspension liquid to build a Fenton-like reaction system, residual organic macromolecules are further oxidized and degraded, and the structure is optimized, so that availability and stability of the carbon source are improved. In the whole process, each link cooperates, so that the organic garbage can be efficiently converted into high-quality carbon source with high C / N ratio and COD value, and can be used in a sewage treatment system as stable external carbon source.

According to the invention, a novel ternary acidic deep eutectic solvent (DES) is prepared, ethylamine hydrochloride (EH) is used as a hydrogen bond acceptor (HBD), and DL-malic acid (MA) and polyethylene glycol-400 (PEG-400) are used as hydrogen bond donors (HBA). The DES solvent has good performance on wood fiber biomass refining pretreatment, and three major components of lignocellulose can be efficiently separated. The ternary acidic DES disclosed by the invention is easy to synthesize, good in stability and simple in use method, and an ideal separation effect can be achieved when high biomass solid content is treated, that is, most cellulose is reserved in a solid form, and most hemicellulose and lignin are converted into a liquid form through dissolution or partial degradation to be separated; and separating the lignin component from the hemicellulose by anti-solvent precipitation. The prepared DES can be recycled after being filtered and subjected to rotary evaporation, still has a separation effect equivalent to that of an original solvent after being recycled for six times, and has good industrial application prospect and value.

The present application relates to a kind of reaction device and method applied to the continuous stage extraction of hemicellulose of biomass, the reaction device includes extractant supply system, extraction reaction system and product collection system, wherein extractant supply system mainly includes extractant storage bottle, liquid flow divider and horizontal flow pump;Extraction reaction system includes rapid heating box, thermal radiation extractant preheater, flow-through reactor, temperature and pressure detection device and extractant distribution filter device;Product collection system includes metal mesh filter, cooling tank, back pressure regulator and sample collection bottle.The reaction device can realize the step-by-step continuous extraction and collection of biomass hemicellulose under different solvent gradient, different time gradient, different temperature gradient, and significantly weaken the secondary degradation reaction of extracted hemicellulose in reaction system, retain hemicellulose macromolecular structure, improve the yield of macromolecular hemicellulose polymer, and can be used to study the extraction process and mechanism of hemicellulose.

The invention relates to the technical field of microbial fermentation, and provides a method for producing single-cell protein, which comprises the following steps: inoculating a crop straw matrix with a first microbial seed for first fermentation; the first microbial seed comprises trametes versicolor; sterilizing a fermentation product obtained by the first fermentation; inoculating second microbial seeds into the sterilized fermentation product for second fermentation; the second microbial seed comprises yarrowia lipolytica / candida utilis. According to the scheme, the combination of the selected first microbial seed solution and the second microbial seed solution has a remarkable synergistic effect, so that the crude protein content, the lignin removal rate, the cellulose retention rate and the yeast biomass are improved, and the hemicellulose loss rate is reduced.

This invention discloses a method for extracting xylose syrup from corn cobs, relating to the field of xylose production. The invention includes equipment for extracting xylose syrup from corn cobs, comprising: a sieving machine for removing dust and fine debris from the corn cobs; and a drum-type washing machine for cleaning the dust and debris from the corn cobs. This invention, through a specially designed soaking device and a timed control system, precisely controls the absorption amount, allowing for more complete hydrolysis of hemicellulose in the corn cob particles into xylose. This reduces incomplete reactions or side reactions caused by insufficient or excessive absorption. The process eliminates the need for frequent manual intervention and can automatically perform detection at preset time intervals, significantly saving labor and time costs. Because the weight of dilute sulfuric acid absorbed by the corn cob particles can be precisely controlled, the reaction conditions for each batch are more consistent, thus ensuring the stability and consistency of the xylose syrup product quality.

This invention belongs to the field of biological breeding technology, specifically involving SlCSLA2 Application of genes in improving the storage and transportability of tomato fruit. This invention addresses the industry problem of severe storage and transport losses in tomatoes due to excessive softening after harvest. For the first time, it utilizes CRISPR / Cas9 gene editing technology to knock out the cell wall hemicellulose (mannan) synthase gene. SlCSLA2 This invention has led to the creation of a tomato mutant with significantly enhanced fruit firmness. The firmness of the entire fruit during the red-ripe stage is 35%–42% higher than that of the wild type, and the firmness can be maintained for about a week after harvest, effectively delaying the softening process and significantly improving storage and transportability. This invention provides new gene targets and technical approaches for breeding tomato varieties with improved storage and transportability.

The invention belongs to the technical field of xylooligosaccharide preparation, and discloses a method for co-producing dissolving pulp and xylooligosaccharide by using bagasse. Comprising the following steps: (1) mixing a hydrogen bond acceptor, an alkaline hydrogen bond donor and a protective agent, and heating and stirring to prepare an alkaline eutectic solvent; (2) adding the bagasse into an alkaline eutectic solvent, and heating and stirring for reaction to obtain a reaction mixture; (3) carrying out solid-liquid separation on the reaction mixture, washing a solid component to be neutral to obtain holocellulose, and collecting a washing solution; mixing the washing solution and the liquid component, adding into absolute ethyl alcohol, standing and precipitating, then carrying out solid-liquid separation, and washing and freeze-drying the solid precipitate to obtain hemicellulose; (4) respectively performing enzymolysis on holocellulose and hemicellulose by adopting xylanase, collecting enzymatic hydrolysate and enzymolysis residues, merging the enzymatic hydrolysate, and treating to obtain xylooligosaccharide; washing and freeze-drying holocellulose enzymolysis residues to obtain the dissolving pulp. The alkaline eutectic solvent is used for assisting enzymolysis to obtain the dissolving pulp and the xylooligosaccharide.

The invention provides biomass silicon-loaded porous carbon, a silicon-carbon negative electrode material and a preparation method of the biomass silicon-loaded porous carbon, and relates to the technical field of porous carbon materials. According to the preparation method of the biomass silicon-loaded porous carbon, firstly, lignin and hemicellulose which are difficult to catalyze and graphitize in coconut shells are selectively removed through pretreatment of an organic solvent, and a foundation is laid for subsequent formation of high-conductivity and high-crystallinity porous carbon; secondly, a porous carbon precursor with a nanoscale hierarchical pore structure is obtained through a low-temperature carbonization process and chemical pore forming, and sufficient space is provided for loading silicon and buffering volume expansion; the graphitization degree and the electronic conductivity of the porous carbon are remarkably improved through catalytic graphitization treatment, and the problem that high porosity and high conductivity are difficult to achieve at the same time in the prior art is solved. The biomass silicon-loaded porous carbon which has high specific surface area, proper aperture and high conductivity and can be comparable with expensive resin-based porous carbon is prepared by taking cheap coconut shells as a raw material, so that the material cost of the high-performance silicon-carbon negative electrode is reduced.

This invention discloses a method for separating all components of lignocellulosic biomass using a composite solvent system based on oxalic acid, belonging to the field of biomass resource utilization technology. The method uses a composite solvent system composed of propylene carbonate, water, and oxalic acid to pretreat lignocellulosic raw materials; the amount of propylene carbonate is 60%–90% of the composite solvent system, and the mass-to-volume ratio of oxalic acid to the composite solvent system is 0.6–1.2 g / mL; the degradation rate of hemicellulose is greater than 55%, the degradation rate of lignin is greater than 32%, and the retention rate of cellulose is greater than 84%. This invention uses poplar wood as the lignocellulosic raw material, achieving efficient separation of hemicellulose, cellulose, and lignin. The solvent used is green and recyclable, which is of great significance for the pretreatment of lignocellulosic raw materials.

This disclosure relates to lyocell materials, smoking articles including the thereof, and methods for preparing said lyocell materials, wherein the lyocell materials can be prepared from a stock solution comprising a cellulose slurry and N-methylmorpholine-N-oxide (NMMO), wherein the cellulose slurry can have a CED viscosity of 4.0 to 11.0, a hemicellulose content of less than 5% by weight, an Fe content of at least 1 ppm and less than 30 ppm by weight, and a Si content of at least 1 ppm and less than 100 ppm by weight.

Methods, apparatuses, and systems for extracting lignin from non-wood black liquor are disclosed. The non-wood black liquor is heated to a first temperature to degrade hemicelluloses contained therein. The liquid is then cooled to a second temperature. The pH of the cooled liquid is chemically reduced to precipitate lignin from the liquid. The liquid is filtered to separate the precipitated lignin from the liquid.

The invention discloses an efficient lignocellulose degradation compound strain and application thereof in producing methane by fermenting straws. The lignocellulose degradation compound strain is prepared from phanerochaete chrysosporium, oyster mushroom, phoenix mushroom and talaromyces pinophilus. When the composite strain is used for pretreating straws, the degradation rate of cellulose in the straws reaches 77.86%, the degradation rate of hemicellulose in the straws reaches 21.01%, and the degradation rate of lignin in the straws reaches 34.85%; when the pretreated straw and the excrement are subjected to anaerobic fermentation together, compared with a control group, the total gas production rate is increased by 86.28%, and the methane production rate is increased by 98.95%. Therefore, the invention provides a green and efficient straw resource utilization technology so as to synchronously realize the purposes of waste reduction, energy recovery and fermentation residue resource utilization.

The invention belongs to the technical field of electro-adsorption materials, and particularly relates to preparation and application of a nitrogen and sulfur co-doped biomass porous carbon electrode material. The preparation method comprises the following steps: dispersing wheat straw powder in an alkaline solution, heating and stirring for reaction, washing slurry to be neutral after the reaction, carrying out solid-liquid separation, and drying to obtain wheat straw powder of which the content of lignin and hemicellulose is remarkably reduced; the method comprises the following steps: uniformly mixing wheat straw powder with ammonium sulfate, and carrying out high-temperature pyrolysis in a protective atmosphere to obtain the nitrogen and sulfur co-doped biomass porous carbon electrode material. The electrode material is prepared into an electrode plate to be assembled into a super capacitor device, voltage is applied between double electrodes of the capacitor to generate an electrostatic field, and free heavy metal ions in an aqueous solution are quickly adsorbed to the surfaces of the electrodes so as to achieve the purpose of purifying water.

The invention relates to a reinforcing and / or filling material based on hemp particles, wherein the hemp particles have a diameter of 1-80 µm and a hemicellulose content of 10-20% by mass. The invention further relates to a method for producing the reinforcing and / or filling material, as well as various uses thereof.

The invention belongs to the technical field of agricultural product processing and natural product extraction, and discloses a method for extracting zeaxanthine extract from fresh wolfberry fruits. The method comprises the following steps: ultrasonically soaking fresh Chinese wolfberry fruits in a 1%-5% Na2CO3 solution for 20-40 seconds, spraying a compound system of 0.2%-0.5% pectinase and / or hemicellulase and 0.2%-1.0% lactic acid bacteria on the surfaces of the Chinese wolfberry fruits, vacuumizing, fermenting at 25-35 DEG C for 4-5 days, vacuumizing, crushing the fruits, and continuously fermenting for 1 day; and drying the fermentation product at 55 + / -5 DEG C, crushing step by step, extracting in a subcritical extraction kettle, extracting most of air, and desolventizing under reduced pressure to obtain the zeaxanthine extract. Through pretreatment, the structure of wolfberry is destroyed, the sugar content is reduced, the content of zeaxanthine in the extract is more than 15% and is increased by more than 3 times compared with the prior art, the process is simple and environment-friendly, and large-scale production is easy to realize.

The invention discloses a paper or paper pulp molded product with high lignin content as well as a preparation method and application of the paper or paper pulp molded product. The paper is paper or a paperboard, the paper or paper pulp molded product further contains cellulose and hemicellulose, the mass of lignin accounts for 25%-45% of the dry weight of the paper or paper pulp molded product, the mass of cellulose accounts for 50%-70% of the dry weight of the paper or paper pulp molded product, and the mass of hemicellulose accounts for 5%-25% of the dry weight of the paper or paper pulp molded product. The paper or paper pulp molded product is prepared through first-stage pulping, second-stage pulping, pulping and forming. The paper or pulp molded product has excellent physical properties. The paper can be used for preparing packaging paper, mulching films and release paper; the paper pulp molded product can be used for household appliance industrial packaging, egg supporting plates, inner liners and paper corner protectors.

The invention belongs to the technical field of biological environmental protection, and discloses Pseudoxanthomonas suwangensis NS44, a microbial agent and application of the Pseudoxanthomonas suwangensis NS44, the Pseudoxanthomonas suwangensis NS44 is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation number is CGMCC No.35937, the preservation date is September 16, 2025, and the preservation number is CGMCC No.35937. The preservation address is Institute of Microbiology, Chinese Academy of Sciences, No.3, Yard 1, Beichen West Road, Chaoyang District, Beijing. The pseudoxanthomonas suwangensis NS44 has the effects of efficiently degrading cellulose, synthesizing IAA and dissolving organic and inorganic phosphorus. The cellulose degrading bacterial agent prepared by the invention is applied to the process of mixing and composting corn straws and pig manure in different proportions, so that the temperature of a compost body can reach more than 55 DEG C faster and lasts for a long time, the degradation of corn straw cellulose and hemicellulose is remarkably improved, insoluble phosphorus in the compost body is synchronously converted into effective nutrients, and the compost quality is improved.

The invention relates to a composition for providing barrier properties for a cellulosic fibre web, such as paper, board or the like. The coating composition comprises microfibrillated non-wood biomass, having a particle size D90<250 μm and particle size D50<100 μm, which microfibrillated non-wood biomass comprises at least 5 weight-% of a hemicellulose fraction and / or pectin, calculated from the dry weight of the microfibrillated non-wood biomass; an auxiliary agent comprising at least one cellulose derivative, and / or a synthetic binding agent, such as polyvinyl alcohol or polystyrene acrylate copolymer.

[Problem] To provide a method for hydrophobizing cellulose that can be used as a substitute for plastic, and hydrophobized modified cellulose. [Solution] The aforementioned problem is solved by a method in which a cellulose-containing material is immersed in or brought into contact with a lignin / PVA solution or a lignin / hemicellulose solution, a complex of the lignin and the PVA or the hemicellulose is adsorbed onto a hydrophilic surface of the cellulose-containing material, and the lignin is adsorbed onto a hydrophobic surface of the cellulose-containing material. Examples of the modified-cellulose-containing material include: natural cellulose, such as paper materials; and regenerated cellulose fibers, such as viscose rayon, cupra, and Tencel (Lyocell).

The invention provides an extraction method for increasing the oleuropein conversion rate and the hydroxytyrosol content in olive pomace, and belongs to the technical field of natural product extraction. Based on the analysis of the characteristics of the olive pomace material, firstly, the compact structure of the olive pomace is destroyed through steam explosion pretreatment, and pores are loosened; then carrying out compound enzyme enzymolysis, cooperatively hydrolyzing wrapped binding protein by adopting acid protease and hemicellulase in a combined manner, destroying a polysaccharide wrapping barrier in the pomace, and promoting rapid release of oleuropein; finally, high static pressure extraction is adopted, ultrahigh pressure is used for accelerating solvent permeation, the conversion rate of oleuropein is increased, and the content of hydroxytyrosol is comprehensively increased. The method is green and efficient, the oleuropein conversion rate can be increased to the maximum extent, and the content of hydroxytyrosol is increased; the degradation loss of hydroxytyrosol in the extraction process is reduced, and the economic benefits of the olive pomace are comprehensively improved.

The application discloses a binary metal catalyst and application thereof in efficient catalytic synthesis of diols from hemicellulose, wherein the binary metal catalyst is prepared by co-precipitation, calcination and reduction of active metal precursors and carrier precursors. The catalyst can directly convert hemicellulose into diols in one step under the action of water as a solvent and hydrogen atmosphere. The catalyst is simple in preparation and synthesis, and has high selectivity, and can hydrogenolyze part of by-products such as erythritol and tetrahydrofurfuryl alcohol into diols, thereby improving the diol yield. Meanwhile, the catalyst has excellent stability, and can overcome the problem of deactivation in the recycling process of the catalyst.

The invention provides a stabilizing treatment process for a wooden pipe body of a woodwind instrument, and relates to the technical field of musical instrument manufacturing and wood modification. According to the process, hemicellulose is subjected to precise enzymolysis through xylanase / mannase, and hydrophobic alkenyl is grafted to reduce hygroscopicity; carrying out vacuum pressure impregnation by using double resin liquid to form a flexible interface layer and a high-modulus functional body layer; and finally, constructing a gradient modulus composite structure through curing such as gradient temperature rise. According to the invention, collaborative optimization of size stability, mechanical enhancement and acoustic retention of the pipe body is realized, hydrophobic and oleophobic properties and antibacterial and wear-resistant properties are achieved, and the problem that size stability and acoustic performance are difficult to consider in the traditional process is solved.

This invention discloses a method for the stepwise extraction of single components from high-purity insoluble dietary fiber, belonging to the field of chemical separation and extraction technology. The method specifically includes: (1) Lignin extraction: reacting high-purity insoluble dietary fiber with a eutectic solvent at high temperature, filtering to obtain filtrate and precipitate one, and then concentrating, settling, washing and drying the filtrate to obtain lignin; (2) Hemicellulose extraction: adding acetone to precipitate one and stirring and centrifuging to obtain precipitate two; then adding alkaline solution to precipitate two, stirring and settling to obtain precipitate three and supernatant; then subjecting the supernatant to alcohol precipitation and freeze-drying to obtain hemicellulose; (3) Cellulose extraction: washing and freeze-drying precipitate three to obtain cellulose. Through the above method, the stepwise extraction of single components from insoluble dietary fiber can be achieved with high purity; in addition, the raw materials used are inexpensive, and waste can be utilized at high value, reducing resource waste.