72results about "Finely-divided material pretreatment" patented technology

The invention relates to the technical field of aramid fiber recycling, high-performance fiber modification and functional fiber reinforced materials, in particular to recycled aramid pulp with mechanical force induced brooming and a preparation method of the recycled aramid pulp. The preparation method comprises the steps of physical screening, chemical stripping pretreatment, thread rolling, pulping, pulping mechanical force coupling, stepped heating drying and opener secondary delinting, and the prepared high-quality aramid pulp is applied to the fields of automobile friction materials, high-performance sealing products and special rubber composite materials. The problems that traditional recycled fibers are poor in dispersity, insufficient in specific surface area and weak in matrix interface bonding can be effectively solved.

The invention relates to the technical field of agricultural waste regeneration, and discloses a method for producing biomass protein by efficiently pretreating straw biomass through combination of steam explosion and a deep eutectic solvent, and the method comprises the following steps: air-drying straw at room temperature, crushing, and pre-extracting to obtain a straw sample for later use; adjusting the water content of the straw sample to a target water content, fully absorbing water at room temperature, filling the straw sample into a steam explosion reaction device, and carrying out steam explosion reaction; carrying out deep eutectic solvent treatment; and carrying out enzymolysis saccharification and fermentation treatment. By adopting the method disclosed by the invention, the removal rate of lignin reaches up to 40.8%, and meanwhile, more than 43.2% of hemicellulose is reserved; meanwhile, the specific surface area and the pore volume are increased, the straw structure is looser and curler, enzyme adsorption is facilitated, and the total sugar conversion rate reaches 50.4%. The crude protein content in the fermentation product reaches 25% or above, and the true protein content reaches 24.5%. The obstacle of straw biomass conversion is overcome, and a foundation is laid for processing the straw biomass into protein feed in a value-added mode.

The invention discloses a preparation method of degradable napkin based on natural plant fibers, and relates to the field of hygienic products. According to the preparation method of the degradable napkin based on the natural plant fibers, natural cellulose raw materials such as the sisal hemp waste residues and the banana stalks are adopted, the source is wide, and the cost is low. Raw materials are cleaned, crushed and degummed to prepare crude fiber bundles, and the crude fiber bundles are converted into soft microfibrillated cellulose colloid through enzyme treatment. Defibering part of the colloid into long-fiber matrix pulp, homogenizing the other part of the colloid at high pressure to prepare short-fiber reinforced pulp, mixing the long-fiber matrix pulp and the short-fiber reinforced pulp to obtain reinforced pulp, and performing papermaking, drying and calendering to prepare the raw paper. According to the process, through fiber softening treatment, the softness and hand feeling of the paper are remarkably improved while the toughness is kept, and the process is suitable for napkin production. A green biotechnology is adopted in the whole process, the pollution load is low, chemicals are biodegradable, and the requirements for low cost and environmental protection are met.

The method comprises the following steps: uniformly mixing a plurality of proton organic solvents with an acidic additive and a magnesium-containing additive, adding a biomass raw material pretreated by using a water-phase microwave method, mixing, putting into a reaction kettle, introducing nitrogen with a certain pressure for protection, and reacting for 2-4 hours; reacting for a period of time at a certain temperature, drying filter residues obtained by filtering to obtain a cellulose-rich component, adding water into filtrate to separate out lignin, and enabling the filtrate to mainly contain hemicelluloses and decomposition products thereof. According to the pretreatment method, the lignin removal rate and the cellulose retention rate of the lignocellulose in the biomass raw material are improved, and the obtained cellulose is generally good in quality.

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 utility model relates to the technical field of purified cotton cleaning, in particular to a purified cotton cleaning treatment system which comprises a cleaning box, opening grooves are formed in the two ends of the top of the cleaning box, strip-shaped fixing plates are symmetrically installed at the two ends of the cleaning box, and a plurality of second supporting rollers are rotationally connected in the cleaning box and between the two pairs of strip-shaped fixing plates. The second supporting rollers are connected through a first conveying belt, one end of one second supporting roller is connected with a first driving motor, the first driving motor is fixed to the side face of the strip-shaped fixing plate, a plurality of first supporting rollers are further rotationally connected into the cleaning box, and the first supporting rollers are connected through a second conveying belt; and the second conveying belt is positioned above the first conveying belt. Through cooperation of the first conveying belt and the second conveying belt, refined cotton can be limited in the refined cotton conveying process, meanwhile, the upper side and the lower side of the refined cotton can be washed through the spray heads, washing is sufficient, and the using effect is improved.

Method and control system are provided for controlling values of process parameters of a pretreatment process of wood particles. A sampler is used to obtain a sample of a product flow of said pretreatment process after said wood particles have undergone steam explosion in a hemihydrolysis reactor. A particle measurement device is used to measure one or more characteristics of particles in said sample and to produce one or more pieces of measurement information indicative of the measured characteristics. Said one or more pieces of measurement information are used to select one or more values of one or more of said process parameters.

The invention discloses high-smoothness paper for daily use and a preparation method thereof. The method comprises the following steps: applying a cationic softening agent (the addition amount is 0.8%-1.2%) to paper pulp fibers, and carrying out physical swelling treatment (0.15-0.20 MPa, 20-30 minutes); then grinding under the power of 280-310 kW, and controlling the concentration to be 3.5%-4.0%; and finally, forming on a 120-140-mesh forming net under the calendering pressure of 0.25-0.30 MPa, drying at the temperature of 110-120 DEG C for 15-20 seconds, and wrinkling. An on-line detection and feedback system can be integrated, and key parameters can be dynamically adjusted. The softness of the prepared household paper is 6.0-8.0 mN, the smoothness is 45-55 s, the wrinkle depth deviation is less than or equal to 0.02 mm, and the raw materials are hardwood pulp and softwood pulp in a ratio of 8.5: 1.5. According to the scheme, unification of softness, smoothness and high strength is achieved, the problems of performance contradiction and unstable production in a traditional process are solved, and the method is suitable for continuous intelligent manufacturing of high-end household paper.

The invention relates to an ethanolamine saccharification treatment method for corn straw and application, and belongs to the technical field of biomass resource utilization. The method comprises the following steps: crushing corn straws to 20-60 meshes, mixing the crushed corn straws with an ethanol amine aqueous solution with the volume fraction of 10-60% according to a ratio, reacting at 30-80 DEG C for 3-16 hours, carrying out solid-liquid separation after the reaction, washing, and drying to obtain a saccharified product. According to the method, the lignin removal rate and the reducing sugar yield are remarkably increased under the mild condition, the reducing sugar content can reach 875.09 + / -25 mg / g dry straw, and the lignin removal rate is 93.33 + / -2%. In addition, the lignin removal process accords with a three-index superposition kinetic model. The obtained saccharification product is high in cellulose content and good in structural crystallinity, can be used for preparing nano cellulose and biodegradable materials or can be used as an ethanol fermentation substrate, and has a good industrial application prospect.

The invention belongs to the technical field of pulp paper production, and particularly relates to a preorder pulp screening and washing process for reducing alkali loss and bleaching chlorine dioxide consumption. The method comprises the following steps: pre-impregnating and cooking a wood chip sample in sequence to obtain coarse pulp; then the coarse pulp is sequentially subjected to joint removal, pressure screening, primary washing, secondary washing, oxygen bleaching, degassing condensation, third washing and fourth washing, and the efficiency of the pulp washer can be effectively improved; meanwhile, multiple times of washing are matched, so that the pulp washing efficiency is maximized, the pulp washing quality is improved, and the alkali loss and the pulp COD (Chemical Oxygen Demand) are greatly reduced. Therefore, according to the technical scheme provided by the invention, the washing alkali loss can be reduced, and the recovery amount of alkaline chemicals is increased; and the COD content in the slurry entering the chlorine dioxide bleaching section can be reduced, and the consumption of a subsequent bleaching oxidant chlorine dioxide is reduced.

The present invention relates to the technical field of pulp and paper making, and specifically relates to a softening and penetrating agent for wood fibers and a preparation method thereof. The present invention overcomes the problems of poor penetration effect of the penetrating agent, high power consumption, and poor pulp quality during the preparation process of chemical mechanical pulping. By impregnating the raw materials and then performing defibration, primary pre-impregnation, defibration, adding a substance containing a penetrating agent for secondary pre-impregnation, and then through steps such as primary grinding, primary low-concentration grinding, and secondary low-concentration grinding, high-quality pulp is prepared. By using synthetic penetrating agent one, the power consumption of the pulp is reduced and the tensile index is overall improved; by changing the ratio of penetrating agent one and penetrating agent two, changing the type and proportioning of penetrating agent two, the average power consumption per ton of pulp is reduced; by changing the dosage of the penetrating agent, changing the conditions of the pre-impregnation stage and the defibration conditions, the fineness of the pulp increases, the bulk thickness of the paper made from the pulp decreases, and the mechanical properties are improved; by changing the type and dosage of the defoaming agent, the power consumption is reduced.

The utility model provides an easy-to-clean type twin-screw extrusion impregnator for pulping and papermaking by plant fiber, which comprises a mounting machine box, a transmission mechanism is fixedly connected to the outer wall of the mounting machine box, two groups of limiting mechanisms are further fixedly connected to one end, far away from the transmission mechanism, of the mounting machine box, and two rotating shafts are further arranged in the mounting machine box. The outer wall of each rotating shaft is fixedly connected with a spiral piece, the transmission mechanism can drive the two rotating shafts and the spiral pieces to rotate in the opposite directions, the limiting mechanisms can quickly mount and dismount the rotating shafts, and mounting is simple and quick.

A method for processing a bark press water from sawmills and / or pulp mills is disclosed. According to the disclosure, the method comprisesa) filtration of the bark press water to provide a bark press water filtrate having a particle size of less than 100 μm, and b) concentrating the bark press water filtrate to a level of at least 10% dry weight and thereby providing a first fraction of concentrated bark press water, comprising tannic compounds; and a second fraction of purified bark press water.

To provide methods for treating cellulosic biomass to produce cellulosic sugars, and products thereof.SOLUTION: A two-step method for activating cellulosic feedstock is described. The feedstock is subjected to a first high-temperature activation step at a temperature above 190°C. and a second activation step at a lower temperature under alkaline conditions. Also described are methods and compositions for the enzymatic hydrolysis of activated cellulose using one or more cellulase enzymes, a surfactant and polyaspartic acid. Also described are products of the methods.SELECTED DRAWING: None

The present disclosure relates to a process for treatment of biomass, specifically for pulping and biorefinery applications. The process relates to an organosolv process using high boiling organic solvents for the extraction of high molecular weight lignin and other products from the solution of pulping liquor, by using recycled liquor as the white liquor for pulping. The disclosure also relates to byproducts of pulp & paper industry such as lignin. C5 & C6 sugars.

The invention particularly relates to a dissolving pulp production process which comprises the following steps: washing and soaking wood chips or cotton linters, and naturally draining to obtain a pretreated raw material; adding adjusting water into the pretreated raw material, then adding sodium sulfite, mixing and stirring, heating and preserving heat, and extracting pre-hydrolysis waste liquid to obtain semi-slurry; the ratio of the absolute dry mass of the pretreated raw materials to the volume of the adjusting water is 1: (5-8); in terms of SO2, the use amount of sodium sulfite is 2%-4% of the absolute dry mass of the pretreated raw material; the heating and heat preservation temperature ranges from 150 DEG C to 160 DEG C, and the heat preservation time ranges from 90 min to 120 min; carrying out sulfate cooking on the semi-slurry to prepare coarse slurry and cooking black liquor; the coarse pulp is bleached, pulped and sieved by adopting an OD0EOPD1 section sequence, and the dissolving pulp is prepared. According to the method, the quality of the dissolving pulp is remarkably improved by adopting sodium sulfite to prehydrolyze the dissolving pulp, the high-end application requirements of cellulose acetate, Lyocell fibers and the like can be met, the vacuum pulp washing link of semi-pulp after prehydrolysis is omitted, the pulp wastage rate is reduced, the MVR evaporator utilizes secondary steam compression reuse, and the water resource utilization rate is improved.

A system and method are provided for predictive control of brown stock treatment at a pulp mill. Various online sensors generate output signals representative of actual values for respective process characteristics, each of which are directly or indirectly affected by adjustments to corresponding process variables. A controller uses the output signals or associated measurement data to dynamically set target values for the process characteristics based on a predicted impact of control responses for corresponding process variables. The controller further generates control signals to actuators associated with the respective process variables based on detected variations between the respective actual values and target values. Exemplary brown stock washing control systems may optimize various types of brown stock washing configurations, including for example vacuum drum washers, compaction baffle washers, chemiwashers, direct displacement washers and wash presses. Cloud-based analytics and machine learning may also be implemented to improve the control algorithms over time.

The present invention relates to the technical field of pulp preparation, specifically a pure physical pulping process for coniferous forest and Tencel, and a mixing device for mixed pulping, comprising a mixing box, the upper surface of which is fixedly connected to two left-right symmetrical loading buckets, the upper surfaces of the two loading buckets are jointly provided with a first driving mechanism, the bottom ends of the loading buckets are rotatably connected to a double-headed crushing blade shaft, and the coniferous forest fibers or Tencel fibers are synchronously separated and crushed and broken up by the double-headed crushing blade shaft and the first driving mechanism, and qualified coniferous forest fibers or Tencel fibers are transported to the interior of the mixing box through filtration of the loading buckets for mixed pulping by the double-headed crushing blade shaft, so that the crushing and breaking up and mixed pulping can be carried out synchronously, and the time difference between the crushing and breaking up can be used to timely remove the mixed pulp before the next input of new coniferous forest fibers or Tencel fibers into the mixing box, thereby ensuring the continuity of the entire mixed pulping process.

A pulping method includes chemical cooking of softwood chips to retain a high lignin content of about 18% to about 28% by weight and fiberization of the cooked softwood chips to a low residual wood shive content of at most 15% by weight.

The application provides a bamboo filament continuous cooking method, which comprises a bamboo filament pretreatment step and a continuous cooking step. In the bamboo filament pretreatment step, the bamboo filament is treated with hot water containing NaOH and alkali such as guanidine hydrochloride for 1-2 hours. The continuous cooking step is carried out by using a horizontal tube continuous digester. Through in-depth study of the chemical and physical changes in the cooking process, the application uses suitable cooking parameters and treatment methods to ensure that the pretreatment process reduces the damage to the papermaking required holocellulose while dissolving the lipid substances and lignin; and improves the silicon retention effect of CaO in the cooking process, so that a small amount of CaO can be used to effectively retain silicon in the cooking process, thereby reducing the difficulty of black liquor treatment and the reactor fouling rate.

The present invention relates to a pretreatment method for extracting lignin from a lignocellulosic raw material, comprising the following steps: (S1) crushing the lignocellulosic raw material and then screening it to obtain a first material; (S2) placing the first material into an impregnation liquid and impregnating it for 1 to 3 hours to obtain a mixed material; the impregnation liquid is a mixture of cyanurate and a polyoxyethylene surfactant with an HLB of 15 to 18 in a mass ratio of 10:0.1 to 0.3, added to water to prepare a mixed solution with a concentration of 0.5 wt% to 2.0 wt%; (S3) steam-exploding the mixed material obtained in step S2; (S4) after the explosion, collecting the exploded material, washing it with water, and drying it to obtain a pretreated material, thereby completing the pretreatment of the lignocellulosic raw material. The pretreatment method provided by the present invention achieves a loose and porous surface structure of the pretreated lignocellulosic raw material, significantly improving the subsequent enzymatic hydrolysis rate.

The invention belongs to the field of renewable resource utilization, and particularly relates to development and utilization of a technology for preparing nano cellulose from waste cotton fabrics, which is hopeful to produce CNCs from high-cellulose-content and high-purity raw materials through a simple process.

The invention discloses antibacterial bamboo-based fiber paper as well as a preparation method and application thereof. The preparation method of the antibacterial bamboo-based fiber paper comprises the following steps: 1) mixing sagittaria trifolia chips and moso bamboo chips for biological fermentation, adding sodium hydroxide and anthraquinone, and cooking to obtain fermented bamboo pulp; (2) adding the bamboo nano cellulose into the fermented bamboo pulp, and pulping to obtain paper pulp; 3, the paper pulp is made into paper, a cationic guar gum solution is sprayed to the surface of the paper, directional dehydration is conducted, and the antibacterial bamboo-based fiber paper.The antibacterial bamboo-based fiber paper has the advantages of being excellent in antibacterial performance, high in strength, good in flexibility and the like, the preparation technology is simple, the equipment requirement is low, and the antibacterial bamboo-based fiber paper is suitable for large-scale industrial production and application.

The utility model discloses a spiral mixing and bleaching device which comprises a conveying shell, a spiral mixing and bleaching device, a spiral mixing and bleaching device, a spiral mixing and bleaching device and a spiral mixing and bleaching device, and is characterized in that the conveying shell is provided with a feed port and a discharge port; the conveying and mixing screw comprises a conveying shaft, a spiral blade and a spiral groove are arranged on the conveying shaft, a liquid conveying channel is arranged on the inner side of the conveying shaft, a liquid conveying opening communicated with the liquid conveying channel is formed in the end of the conveying shaft, and an inner liquid adding opening communicated with the liquid conveying channel is formed in the conveying shaft. Liquid medicine is added from the outer liquid adding opening in the conveying shell, namely from the radial outer side of materials, and is added from the inner liquid adding opening in the conveying shaft, namely from the radial inner side of the materials to be in contact with and mixed with the materials, and the materials are conveyed to the discharging opening in the spiral groove, stirred and further mixed with the liquid medicine for bleaching. The liquid medicine is added to the radial outer side and the radial inner side of the material, the contact mixing points of the material and the liquid medicine are increased, and the mixing blind area is reduced, so that the mixing uniformity of the material and the liquid medicine can be improved, and the adding amount of the liquid medicine is reduced.

Provided is a pulp production method which is less likely to lead to a decrease in productivity even when a plant of the family Palmaceae is used. A pulp production method includes defibrating a wood material by a digesting treatment using an aqueous alkali solution. The wood material comprises a compressed material obtained by compressing a crushed material of a plant of the family Palmaceae. The compressed material has a specific gravity greater than or equal to 0.35 and less than or equal to 1.30 and a water content of less than or equal to 25% by mass. The compressed material preferably has a surface area of less than or equal to 15 cm2. The crushed material preferably contains a crushed material having a length of 0.6 mm or more and 40.0 mm or less and an outer diameter of 0.08 mm or more and 1.5 mm or less. The comminuted material having this size preferably has a content higher than or equal to 70% by mass based on the total mass of the comminuted material.

The application relates to a preparation process of a heat-insulating biomass-based building board. The preparation process of the heat-insulating biomass-based building board comprises the following steps: mixing and dispersing of biomass raw materials, fiber dissociation of the biomass raw materials, hydrogen bond recombination, board pressing, heat treatment and the like. The prepared heat-insulating biomass-based building board has heat preservation and insulation effects, and the structure is controllable and has good durability, so the heat-insulating biomass-based building board has very good application prospect in the field of building boards.

The present invention relates to a process for digesting biogenic lignin-containing material, e.g. in the form of wood, in which the biogenic material, in paste or particulate form, is first impregnated with an excess of water-miscible organic solvent having a boiling point of < 110°C, this solvent is then separated out and the product obtained in this way is subsequently treated with a digestion reagent for lignin, in order to separate the biogenic material into its component parts (e.g. in particular lignin, cellulose and hemicellulose). The water content in the biogenic material is significantly reduced through the pre-treatment with the water-miscible organic solvent, thus reducing the energy requirement of the digestive process.

A method for producing a cellulose polymer having a cellulose content of 92% or more from textile waste, It is a mixture of cotton and PET, and the raw material (educt) is less than 1mm in length. The mixture is treated in a reactor with subcritical water at a temperature of 130 to 200° C., particularly preferably 160 to 200° C., and a pressure of 1 to 25 bar, preferably 1 to 10 bar, for about 1 to 120 minutes. A method for producing a cellulose polymer having an average degree of polymerization of 450 to 650.

A process to extract lignin and / or cellulose fibres from a lignocellulosic biomass substrate comprising the steps of: pre-treating the lignocellulosic biomass substrate with a binary acidic deep eutec

Method and control system are provided for controlling values of process parameters of a pretreatment process of wood particles. A sampler is used to obtain a sample of a product flow of said pretreatment process after said wood particles have undergone steam explosion in a hemihydrolysis reactor. A particle measurement device is used to measure one or more characteristics of particles in said sample and to produce one or more pieces of measurement information indicative of the measured characteristics. Said one or more pieces of measurement information are used to select one or more values of one or more of said process parameters.