152results about "Cellulose material pulping" patented technology

The invention relates to the technical field of fuel cells, in particular to a preparation method of multi-gradient pore structure carbon fiber paper for a gas diffusion layer of a fuel cell and the carbon fiber paper. The preparation method comprises the following steps: carrying out mechanical treatment on artificial fibers, and carrying out solid-liquid separation to obtain mechanically treated artificial fiber slurry; mixing the fiber slurry with nanofibers and surface modified carbon fibers to prepare composite fiber slurry; an inclined wire wet forming process is adopted, the pore structures of the carbon fiber base paper are regulated and controlled by adjusting the proportion of fibers with different sizes, and the carbon fiber base paper with different pore structures is subjected to multi-layer compounding according to a certain gradient of low, medium and high; after compounding, the carbon fiber paper with a multi-gradient pore structure is prepared through the processes of resin impregnation, hot-pressing curing, carbonization, graphitization and the like. The preparation method provided by the invention is simple and convenient in process flow, meets the requirements of high conductivity, high air permeability and high strength of the carbon fiber paper, optimizes the drainage capacity of the battery, and improves the battery performance.

The invention relates to the technical field of bamboo pulp bleaching, and particularly discloses a method for preparing all-chlorine-free bleached bamboo pulp and application. The method adopts a three-section enhanced bleaching process and comprises the following steps: firstly, decomposing lignin under an alkaline condition of 100-115 DEG C through oxygen delignification (Op section); removing transition metal ions by using sulfuric acid and a metal chelating agent with a specific structure by adopting acid pickling chelation (AQ section); and finally, deeply oxidizing the residual lignin in a high-pressure oxygen environment through oxygen enhanced bleaching (Po section). In each stage, hydrogen peroxide is used as a main bleaching agent, sodium hydroxide, sodium silicate and other assistants are matched, and ineffective decomposition of hydrogen peroxide is effectively inhibited through staged pH regulation and a metal chelation technology. The whiteness of the obtained bamboo pulp is larger than or equal to 83% ISO, the kappa number is smaller than or equal to 3.0, and the requirements of high-grade paper products are completely met.

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 invention relates to a method for preparing lignocellulose nanofibril and a lignocellulose nanofibril prepared by the method. The present invention also relates to a method for preparing a lignocellulose nanofibri reinforced composite material, and a lignocellulose nanofibri reinforced composite material prepared by the method.

The invention provides kenaf whole stalk APMP pulp and a preparation method thereof.The preparation method comprises the specific steps that S1, air-dried kenaf whole stalks are cut into strips, washing and impurity removing are conducted, and a material a is obtained; s2, carrying out pre-steaming treatment on the material a, and extruding and defibering the steamed material to obtain a material b; s3, adding the material b into the pre-impregnation liquid for impregnation to form slurry, and performing centrifugal dewatering on the slurry until the concentration is 20-30wt% to obtain slurry a; s4, grinding the pulp a to form high-concentration ground pulp, adding the high-concentration ground pulp into the adjusting liquid a, bleaching, and centrifugally dewatering until the concentration is 20-30wt% to obtain pulp b; s5, the pulp b is added into the adjusting liquid b for second-stage bleaching and centrifugal dewatering till the concentration is 20-30 wt%, pulp c is formed, the pulp c is diluted and ground, cleaning and screening are conducted after grinding is completed, and the kenaf whole stalk APMP pulp is obtained. The kenaf whole stalk APMP pulp has good pulp characteristics, the dependence of traditional APMP pulping on wood is broken through, and the current situation that domestic pulping wood resources are deficient is relieved.

The invention belongs to the technical field of mineral flotation, and particularly relates to a cellulose-based coal slime collecting agent and a preparation method and application thereof. The method comprises the following steps: performing wet grinding on recycled waste paper to obtain a paper pulp solution, stirring until paper pulp fibers are uniformly dispersed, adding excessive lithium chloride and sodium periodate, performing stirring reaction, cleaning and centrifuging to obtain precursor cellulose, performing amino alkylation modification to obtain amino alkyl cellulose, preparing the amino alkyl cellulose into a 20 g / L solution, and performing vacuum drying to obtain the lithium ion battery cathode material. And then uniformly mixing with non-polar hydrocarbon oil according to the volume ratio of 1: 2 to obtain the coal slime collecting agent. The prepared coal slime collecting agent contains the hydrophobic nanocellulose with the large length-diameter ratio, in the flotation process, adhesion of bubbles and minerals can be promoted, diffusion of the bubbles is promoted, and the flotation efficiency and the recovery rate are improved.

The invention relates to a preparation method of bamboo fibers for filter paper, the filter paper containing the bamboo fibers and a preparation method of the filter paper. The preparation method of the bamboo fiber for the filter paper comprises the following steps: (1) selecting bamboo materials; (2) chemical treatment is conducted, specifically, chemical treatment is conducted on the bamboo wood selected in the step (1) through chemical agents; (3) defibering: defibering the material obtained by chemical treatment in the step (2) to obtain coarse slurry; and (4) screening the coarse pulp obtained in the step (3) to obtain the bamboo fibers. The prepared bamboo fiber has the mechanical property of high elastic modulus, and the air filter paper made of the bamboo fiber has the properties of high breathability, high stiffness and high bulk.

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.

A blow valve 15 and a biomass processing system 1 comprising such a blow valve Said blow valve 15 being connectable in a blow line 7 which is connecting two differently pressurized vessels 3, 5 of the biomass processing system 1. Said blow valve 15 is configured for controlling the flow of biomass material and fluid in the blow line 7, wherein said blow valve 15 comprises a shutter valve 31 with a central opening 33 of controllable size, said shutter valve 31 comprising a number of valve plates 35 which are disposed in an annular pattern surrounding the central opening 33 of the shutter valve 31 and wherein said valve plates 35 are movable in relation to each other whereby the size of the central opening 33 is controlled by moving the valve plates 35.

The present invention relates to a preparation method for a bamboo fiber for filter paper, filter paper containing the bamboo fiber, and a preparation method for the filter paper. The preparation method for a bamboo fiber for filter paper of the present invention comprises the following steps: (1) material selection: selecting bamboo; (2) chemical treatment: using a chemical agent to perform chemical treatment on the bamboo selected in step (1); (3) defibering: defibering the material obtained by means of the chemical treatment in step (2), to obtain coarse pulp; and (4) screening: screening the coarse pulp obtained in step (3) to obtain the bamboo fiber. The bamboo fiber prepared in the present invention has the mechanical property of a high elastic modulus, and the air filter paper manufactured using the bamboo fiber has the properties of high air permeability, high stiffness and high bulk.

According to an example aspect of the present invention, there is provided a method for manufacturing cellulose films and / or coatings from alkaline cellulose solutions via citric acid regeneration coagulation.

An article including a first fiber derived from a first natural source and a second fiber derived from a fruit. A method of manufacturing an article may include combining a first and second fiber to form a fiber mixture, where the first and second fibers are obtained from discrete materials, and where at least one of the fibers is derived from an edible fruit of a plant. The article may be formed from the fiber mixture.

The present invention provides a porous paper-based decorative material and a preparation method thereof. The preparation method comprises: S100, separately preparing a porous paper base, an anti-mildew coating, and a decorative coating; S200, applying the anti-mildew coating to the paper base and performing a first heat treatment to form an anti-mildew layer on the porous paper base; S300, applying the decorative coating to the anti-mildew layer and performing a second heat treatment to form a decorative layer on the anti-mildew layer, thereby obtaining the porous paper-based decorative material. The porous paper base comprises hollow silica particles, the anti-mildew coating comprises chitosan, and the decorative coating comprises sodium alginate. The temperature of the first heat treatment is 80°C to 90°C, and the temperature of the second heat treatment is 100°C to 110°C. The present invention can produce a porous paper-based decorative material with good mechanical strength and resistance to mildew.

The invention discloses a pulping method of bleached chemical pulp, which comprises the following steps: (A) adjusting the concentration of pulp after cooking reaction with water, and adding bio-enzyme and oxidizing compound for oxygen removal reaction to obtain pulp after oxygen delignification; (B) bleaching the paper pulp subjected to oxygen delignification with chlorine dioxide to obtain bleached paper pulp; (C) carrying out alkali extraction on the bleached paper pulp to obtain the bleached chemical pulp, the biological enzyme is one or more of xylanase, hemicelluloses hydrolase, laccase, fiber oxidase, lignin peroxidase and multifunctional peroxidase. According to the method, specific bio-enzyme is added in an oxygen removal section, a common oxygen removal section is converted into bio-enzyme and oxygen bleaching delignification, delignification of a rear section is selectively improved, the load of front-section cooking can be released, the use amount of caustic soda for oxygen removal and cooking is reduced, and the production cost is reduced. Meanwhile, the oxygen removal efficiency, the subsequent bleaching efficiency and the sustainable production level of the paper pulp can be improved.

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.

The present invention relates to a method for preparing monomers via depolymerisation from lignocellulose-containing biomass.

The utility model relates to the technical field of slurry circulation, and provides a slurry circulation system which comprises a biological pretreatment device, a pulping machine main body is arranged on the outer side wall of the biological pretreatment device, a pipeline on the outer side of the pulping machine main body is communicated with a high-concentration pulping machine, and the high-concentration pulping machine is used for increasing the concentration of slurry conveyed by the pulping machine main body. The outer side of the high-concentration pulping machine is connected with a chemical pool through a pipeline, the outer side of the chemical pool is provided with a puffing pool, and the puffing pool is connected with the pulp mixing pool through a pipeline to convey pulp to the pulp mixing pool; the pulp mixing tank is used for adjusting the concentration and the temperature of the paper pulp, and a water outlet at an outlet of the pulp mixing tank is connected with a paper pulp deinking tank: the fiber structure is improved through biomass pretreatment, so that the subsequent pulping is more efficient. Fiber separation is carried out in the pulping machine by adopting an efficient grinding technology, so that the pulping efficiency is further improved. And automatic quality control detection ensures the stability of paper pulp quality.

The present invention relates to an apparatus (1) for use in cellulose hydrolysis. The apparatus (1) comprises a channel (10) for guiding a stream of cellulose-containing waste in a flow direction (FD). The apparatus (1) further comprises one two or more shaft(s) (20) arranged to rotate around respective longitudinal axes (A), such that, when rotated, one or more side surfaces (71) of said shaft(s) (20) exhibit a linear velocity vector orthogonal to the axis (A). The two or more shafts (20) include one or more protrusions (70) that radially extend away from the axis (A). The present invention further proposes a method for cellulose hydrolysis.

The application discloses a food-grade high-strength and high-toughness paper pulp, paper products and a preparation method thereof, and belongs to the technical field of papermaking. The food-grade high-strength and high-toughness paper pulp comprises 100 parts of virgin wood pulp, 1-3 parts of alginic fiber, and 0.3-1.5 parts of a wet strength agent, and the wet strength agent is a random copolymer of methyl acrylate, glycidyl ether-based polyethylene glycol monoallyl ether, dihydro-jasmine acid methyl acryloyl oxy hydroxypropyl ester and acrylamide propyl trimethyl ammonium chloride. The alginic fiber and the wet strength agent are added into the virgin wood pulp, so that the strength and toughness of the paper products are improved.

The invention relates to a process for producing a wood fibre material, comprising the steps of: heating wood chips (18) in a pre-cooker (16) by means of water or steam (26), then cooking the wood chips (18) by means of steam (26) in a cooker (14), then fibrising the wood chips (18) in a refiner (32) such that fibre material (34) is produced, wherein some of the steam branches off after fibrising and is used to heat the wood chips (18) in the pre-cooker (16), and also comprising the step of introducing an oxidisation agent (56) into the branched-off steam (26) such that volatile organic substances contained in the steam (26) are oxidised and purified steam (68) is produced, wherein the purified steam (68) is at least partially used to heat the wood chips (18).

The application provides a whole-stalk kenaf APMP pulp and a preparation method thereof, and the specific steps comprise the following steps: S1, cutting the air-dried whole-stalk kenaf into strips, washing and removing impurities to obtain material a; S2, pre-steaming the material a, and extruding and defibrating the steamed material to obtain material b; S3, impregnating the material b in a pre-impregnation liquid to form pulp, and centrifugally dewatering the pulp to a concentration of 20-30 wt% to obtain pulp a; S4, grinding the pulp a to form high-concentration ground pulp, adding the high-concentration ground pulp into an adjusting liquid a to bleach, and centrifugally dewatering the high-concentration ground pulp to a concentration of 20-30 wt% to obtain pulp b; S5, adding the pulp b into an adjusting liquid b to perform two-stage bleaching, centrifugally dewatering the pulp b to a concentration of 20-30 wt% to form pulp c, diluting the pulp c, grinding the pulp c, washing and screening after the grinding is completed, and obtaining the whole-stalk kenaf APMP pulp. The whole-stalk kenaf APMP pulp has good pulp properties, breaks the dependence of traditional APMP pulping on wood, and alleviates the shortage of domestic pulping wood resources.

The invention relates to a plant (100) for pulp preparation and supply of pulp of production quality (160) to at least one fiber forming plant (200), wherein the plant is built in scalable modular form, as well as a fiber forming plant (200) with such a plant (100) and a method (300) for building such a plant (100) and a method (400) for extending such a plant (100).The system (100) comprises at least one supply module (110) and one or more process modules (120), wherein the supply module (110) and the process modules (120) are equipped with a multitude of coordinated interfaces (150) to connect the supply and process modules (110, 120) to each other, to ensure the infrastructure supply of the process modules (120), and to receive the pulp or its components and starting materials via at least one input (130) and transport it between the process modules (120), and to offer the pulp with production quality (160) via an output (140) for use by at least one fiber forming system (200).

This digestion accelerator contains at least one digestion-accelerating component selected from the group consisting of casein, an amino acid having an aromatic ring or a heterocyclic ring, and salts thereof.

The utility model relates to an ivory board pulping system and an ivory board pulp preparing system, and the ivory board pulping system comprises a first pulper in a first spare part system and a second pulper in a second spare part system, the first pulper, the first discharge pump and the first discharge tower are arranged in the first pulp preparation system, the second pulper, the second discharge pump and the second discharge tower are arranged in the second pulp preparation system, and the third pulper, the third discharge pump and the third discharge tower are arranged in the third pulp preparation system. The white cardboard pulping system is formed by the pulpers of the first pulp preparation system, the second pulp preparation system and the third pulp preparation system, and when one of the pulpers breaks down, the other pulpers can be switched through the first valve unit or the second valve unit to replace the broken pulp. The situation that pulp is tight or broken in the pulp preparation system with the fault pulper is avoided, and then the situation that paper quality fluctuates and production halts is avoided, so that the operation efficiency of a paper machine is improved.

A method for isolating lignin and synthesizing nanocellulose from lignocellulosic materials is provided. The method describes crushing and grinding the lignocellulosic material under pressure with a solid acid catalyst to induce a solid-solid chemical reaction to depolymerize the lignocellulosic materials into a first product, hydrolyzing the first product into a second product, dissolving the second product in water to form a third product, reslurrying a solid mixture using a flotation reactor, collecting a froth at the top of the reactor and drying the froth to yield lignan. A system is also provided for isolating lignin and synthesizing nanocellulose.

In general, present invention concerns an integrated lignocellulose-to-chemicals biorefinery, enabling production of renewable n-propylbenzene, phenolic oligomers, and carbohydrate pulp from lignocellulosic biomass. And it concerns an integrated biorefinery, enabling production of renewable n-propylbenzene, phenolic oligomers, and carbohydrate pulp from lignocellulosic biomass.

The invention relates to the technical field of paper pulp preparation, in particular to a coniferous forest and tencel pure physical pulping process and mixing equipment used for mixed pulping, the coniferous forest and tencel pure physical pulping process comprises a mixing box, the upper surface of the mixing box is fixedly connected with two loading barrels which are in bilateral symmetry, and the upper surfaces of the two loading barrels are jointly provided with a first driving mechanism; the bottom end of the loading barrel is rotationally connected with a double-end crushing blade shaft, and the coniferous forest fibers or tencel fibers are synchronously separated, crushed and scattered through the double-end crushing blade shaft and a first driving mechanism; qualified coniferous forest fibers or tencel fibers are conveyed into the mixing box through filtering of the loading barrel, and mixed pulping is performed through the double-end crushing blade shaft, so that crushing, scattering and mixed pulping can be performed synchronously; and paper pulp obtained after mixed pulping can be taken out in time before new coniferous forest fibers or tencel fibers are input into the mixing box at the next time by utilizing the time difference of crushing and scattering, so that the continuity of the whole mixed pulping process is ensured.

A process for producing mechanical wood pulp is provided, wherein the process comprises a step of grinding optionally pretreated wood chips in a refiner unit at an operating temperature of at least 155°C, a bleaching formulation is added prior to and / or during the grinding step, and the bleaching formulation comprises (A) a salt of the dithionous acid H2S2O4, and (B) a salt comprising a polyanionic component having at least 5 anionic units, selected from a COO- group and a PO3 - group.