57results about "Finely-divided material pretreatment" patented technology

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 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.

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 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.

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.

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 relates to the technical field of extraction of active ingredients of natural plants, in particular to a method for extracting active ingredients of Chinese honeylocust fruits. Aiming at the problems of low extraction efficiency, high energy consumption and the like of the current Chinese honeylocust fruit active ingredient extraction technology, the invention provides the following technical scheme: step 1, raw material pretreatment: purifying, drying and crushing a Chinese honeylocust fruit raw material to obtain Chinese honeylocust fruit powder; step 2, active component extraction: mixing the saponin powder with an extraction medium, adding an enzyme preparation, performing microwave-assisted extraction, and performing solid-liquid separation to obtain supernate containing active components and filter residues; step 3, active component purification: adsorbing, eluting and concentrating the supernate to obtain a saponin active component concentrated solution; and 4, residue treatment: carrying out chemical treatment on the solid-phase residue to obtain a cellulose product. Through the synergistic effect of low-temperature microwaves and composite enzymolysis, oxidative degradation of thermosensitive components is avoided through low-temperature temperature control, the cellulose product is prepared from residues through treatment, and zero-waste utilization of saponin is achieved.

A treatment vessel (10) for treating lignocellulosic material comprises a main section (20) having a first end (24) and a second end (26), and an outlet section (40) that is conical or frustoconical and tapers from a first end (44) joined to the second end (26) of the main section (20) towards a second end (46) having an outlet opening (48). A conical body (60) is arranged within the treatment vessel (10), the vertex (64) of the conical body pointing away from the main section (20). The conical body (60) is positioned such that the base (62) thereof is positioned within a perpendicular distance (d) from a transition plane (T) defined by the junction between the first end (44) of the outlet section (40) and the second end (26) of the main section (20), wherein the perpendicular distance (d) is ¼ or less of the diameter (D) of the main section (20). A half angle (β) of the conical body (60) is 0.5-20° less, preferably 5-15° less, such as 10° less, than a half angle (α) of the outlet section (40).

The invention relates to enzymatic banana cauloid fiber bamboo pulp paper with high mechanical performance and a preparation method of the enzymatic banana cauloid fiber bamboo pulp paper. The banana cauloid is used as a raw material, a specific method is adopted to treat the banana cauloid, then the banana cauloid pulp is prepared through the steps of enzyme treatment, alkali treatment, washing, bleaching and the like, and the banana cauloid fiber and the bamboo pulp fiber are scientifically proportioned to replace part of the bamboo pulp fiber, so that the mechanical property of the pure bamboo pulp paper is improved, and the quality of the pure bamboo pulp paper is improved. The bamboo pulp paper with excellent performance is developed while the production cost is reduced.

The invention provides a transverse pipe continuous cooking system which comprises a hydraulic grass chopper, a dewatering screw, a conveying screw, a feeding screw, a T-shaped pipe and transverse cooking pipes connected in series, the hydraulic grass chopper, the dewatering screw, the conveying screw, the feeding screw and the T-shaped pipe are sequentially connected, a grass chopping assembly is arranged at the bottom in the hydraulic grass chopper, and an impurity removing assembly is arranged on the upper portion in the hydraulic grass chopper. A detachable radial cutting assembly is arranged between the impurity removing assembly and the grass chopping assembly, a steam exhaust port of the transverse cooking pipe is connected with an inner cavity of the conveying screw, and an exhaust port is formed in the conveying screw. The discharged steam is used for pre-steaming the grass pieces, waste heat is recycled, and the cost is reduced; meanwhile, in the hydraulic grass chopper, through the arrangement of the impurity removal assembly, impurities such as broken stones and metal are removed, the equipment cost is saved, and the working procedures are shortened.

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 utility model relates to the technical field of refined cotton production, in particular to high-polymerization-degree refined cotton production equipment which comprises a soaking pool, bottom feet are fixed to the lower end of the soaking pool, supporting plates are fixed to the two sides of the soaking pool, air cylinders are arranged above the supporting plates, and the lower ends of the air cylinders are fixedly assembled with the surfaces of the supporting plates through screws. A telescopic piston rod is arranged in the air cylinder, and a cover plate is fixed to the end of the piston rod and located above the soaking pool. When chemical treatment soaking of the refined cotton needs to be carried out, the piston rod of the air cylinder extends to the maximum, the refined cotton is placed on the grating plate, then the piston rod of the air cylinder retracts, the cover plate and the grating plate can sink into the soaking pool and make contact with soaking liquid, the soaking liquid can pass through the micropores of the grating plate, and therefore the refined cotton can be soaked. Large impurities in the refined cotton are prevented from falling into the bottom of the soaking pool, and finally, the cover plate covers the end face of the soaking pool, so that stable contact between the refined cotton and the soaking liquid in the soaking process can be realized.

The invention provides a manufacturing method of high-stiffness high-air-permeability large-weight punching-free forming paper. The manufacturing method comprises the following steps: taking softwood pulp fibers, sisal pulp and chemical fibers with specific raw material performance indexes as raw materials; performing defibering treatment on the softwood pulp fibers, the sisal pulp and the chemical fibers respectively; mixing the defibered softwood pulp fibers, the defibered sisal pulp and the defibered chemical fibers according to the mass percent of 50-100%, 0-50% and 0-50% respectively, adding polyamide epichlorohydrin resin, diluting, further adding a polyoxyethylene solution, mixing, simultaneously controlling the net concentration of the mixed pulp to be 0.05-0.3 wt%, carrying out net papermaking molding, and then sequentially carrying out squeezing and drying treatment; the paper sheet is dip-coated with a sizing agent, then drying treatment is conducted again, and the paper sheet is obtained through coiling. The forming paper has high stiffness, high air permeability and large quantitative performance, and compared with an existing forming paper preparation process and on-sale forming paper, the forming paper has obvious technical advantages and performance advantages.

The invention to which this application relates is apparatus and a method for use in the preconditioning, processing of a material mixture and forming of end products from the processed material mixture which includes fibres such as cellulose fibres so as to allow the end products including the same to be formed in an efficient and controllable process.

Systems and methods are provided for predictive control of brown stock handling at a pulp mill. Various online sensors produce output signals representative of actual values of respective process characteristics, each of which is directly or indirectly affected by adjustments to a corresponding process variable. A controller uses the output signals or related measurement data to dynamically set target values for the process characteristics based on predicted effects of control responses to the corresponding process variables. The controller further produces control signals to actuators associated with the corresponding process variables based on detected differences between the respective actual values and the target values. Exemplary brown stock washing control systems can optimize various types of brown stock washing configurations, including, for example, vacuum drum washers, compaction baffle washers, chemical washers, direct displacement washers, and wash presses. Cloud-based analysis and machine learning can also be implemented to improve control algorithms over time.