108results about "Cellulosic pulp after-treatment" patented technology

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.

In a process for oxidation of white liquor, in particular of white liquor used in a process of production of paper or cellulose, the oxygen required for the oxidation is supplied to the reactor or the reactors in which the oxidation is carried out at least partially in the form of oxygen-containing nanobubbles. Due to the relatively long lifetime of the nanobubbles this very efficiently provides oxygen also for oxidation reactions in the white liquor proceeding at different rates.

The invention provides alkaline laccase WCotA and application thereof, and belongs to the technical field of biological engineering. According to the invention, assumed protein codons from bacillus amyloliquefaciens are optimized by a bioengineering technology, then are heterologously expressed on a carrier, and are transferred into escherichia coli with clear genetic background and fast growth cycle for amplification and expression to obtain a protein product; the amino acid sequence of the protein product is as shown in SEQ ID NO.1, and the nucleotide sequence for coding the protein product is as shown in SEQ ID NO.2; according to the present invention, the characterization results show that the protein product has high laccase activity, and is marked as alkaline laccase WCotA; the alkaline laccase WCotA has the outstanding advantages of alkali resistance, high temperature resistance, wide pH action range and the like, and has good application in the fields of textile industry, food processing, pulping processing, industrial wastewater treatment and the like.

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

The invention belongs to the technical field of cellulose preparation, and particularly relates to micro / nano cellulose based on high-shear intramolecular friction dissociation and a preparation method thereof, and the preparation method comprises the following steps: (1) crushing a cellulose raw material; (2) adding the crushed cellulose into a dilute acid solution at a preset temperature, and dissociating under the action of double-helix high-pressure homogenization to obtain a micro / nano cellulose acidic dissociation liquid; and (3) repeatedly centrifuging the micro / nano cellulose acidic dissociation liquid with deionized water until the micro / nano cellulose acidic dissociation liquid is neutral, and freeze-drying to obtain the micro / nano cellulose. According to the method, multi-selectivity natural cellulose is taken as a raw material, and the long-standing triangular problems of uneven size, overhigh energy consumption and chemical pollution in micro / nano cellulose production are solved through directional utilization of intramolecular friction energy by a double-helix high-pressure homogenization method.

The present disclosure is directed to a method for repulping lignocellulosic fibers having at least one wet strength resin disposed thereon, the method comprising: b) preparing an aqueous slurry comprising (1) the lignocellulosic fiber, (2) the resin, and (3) an enzymatic agent present in an amount of from about 0.01 to about 1 wt.%, based on the dry weight of the lignocellulosic fiber, wherein the enzymatic agent comprises: i) at least one hemicellulase; and, ii) at least one cellulase; and, c) agitating the slurry.

The invention provides carboxymethylated bamboo pulp reinforced composite paper and a preparation method thereof. The BCTMP is subjected to carboxymethylation modification by adopting an alkalization-etherification method, and compared with unmodified BCTMP, the prepared carboxymethylated bamboo wood chemithermomechanical pulp (CM-BCTMP) has the advantages that the fiber softness, the hydrophilicity and the inter-fiber binding capacity are remarkably improved. After the modified bamboo pulp and the unbleached sulfate wood pulp are mixed according to the proportion of 5: 5, the tensile index of finished paper is increased by 70% or above, the burst index is increased by 30% or above, the bottleneck problem that the paper strength is sharply reduced due to high-proportion bamboo pulp mixing is successfully solved, and a new way is provided for preparing a low-cost and high-strength paper-based material.

The apparatuses, methods and systems for yield increase in a kraft cooking plant present synergies for at least two parallel cooking plants, e.g., one producing dissolving pulp in a prehydrolysis kraft process, and the other producing kraft pulp by kraft pulping process, which may facilitate increased cooking yield in the kraft cooking plant producing kraft pulp by recovering the hemicelluloses solubilized in the acidic hydrolysate of the prehydrolysis kraft process. In some implementations, there may be no cold caustic extraction step on the dissolving pulp line as the target pulp purity can be achieved by performing just a prehydrolysis step, with reutilization of an acidic hydrolysate stream in a kraft pulp line.

The invention provides a fluff pulp board. The complete raising and defibering time of the fluff pulp board is not longer than 30 s, and the tightness is not higher than 0.6 g / cm < 3 >. The fluff pulp board is made of mixed fibers of needle-leaved wood fibers and bamboo fibers, and the mass percent of the needle-leaved wood fibers is 30%-60%; the average fiber length of the mixed fibers is larger than 2 mm, and the length weighted proportion of fine fibers is lower than 17%. The invention further provides a preparation method of the fluff pulp board. According to the technical scheme, the respective advantages of the coniferous wood and the bamboo wood are considered, the using requirements of downstream customers can be met, the using amount of the coniferous wood can be effectively reduced, the purchasing period of the coniferous wood is prolonged, and closed-loop cyclic utilization of bamboo wood resources in the natural world is achieved.

The invention relates to a waste paper recycling method and application thereof, and belongs to the technical field of waste paper recycling. The invention provides a waste paper recycling method which comprises the following steps: S1, adding a compound enzyme into a reaction kettle, heating to 40-50 DEG C, adding waste paper, pulping, performing ultrasonic treatment, performing enzymolysis, and filtering to obtain pretreated fiber pulp; s2, transferring the pretreated fiber pulp into a photocatalytic reaction tank for reaction; s3, spraying a nano material to form a Zeta potential gradient, transferring into an electromagnetic field treatment device, carrying out directional arrangement, dehydrating, and drying to obtain paper; wherein the compound enzyme is prepared from cellulase, xylanase, laccase and pullulanase. According to the method, key indexes such as deinking efficiency, fiber protection, bleaching performance and mechanical strength are remarkably improved, the technical bottleneck in recycling of the oil-containing waste packing paper is successfully solved, and a breakthrough scheme is provided for production of high-added-value regenerated paper pulp.

The invention relates to a cellulose-containing material and a process for preparing the same. Disclosed is a process for producing a cellulose-containing material comprising: (a) contacting a cellulose source with a solvent comprising zinc ions and formic acid to provide a solution; (b) extruding the solution from (a) into a coagulating bath to provide a solid material; (c) immersing the solid material from (b) in an oxidizing solution; (d) freezing the oxidizing solution submerging the solid material; and (e) separating the solid material from (d) to provide the cellulose-containing material. The process may further include solubilizing the protein and coagulating the resulting solution to form a cellulose / protein-containing material. The cellulose-containing materials and cellulose / protein-containing materials can be produced, for example, as reconstituted fibers and membranes.

The present invention relates to novel esterases, more particularly to esterase variants having improved activity and / or improved themostability compared to the esterase of SEQ ID N°1 and the uses thereof for degrading polyester containing material, such as plastic products. The esterases of the invention are particularly suited to degrade polyethylene terephthalate, and material containing polyethylene terephthalate.

The utility model provides a device for bleaching slurry by ozone, which comprises a tank body, a stirring device is arranged from the top to the bottom of the tank body in a penetrating manner, the top of the tank body is provided with a feeding device and a tail gas discharge port, and the bottom of the tank body is provided with a discharge port; the tank body is divided into at least one reaction chamber by a reaction chamber bottom plate in the axial direction of the stirring device, the reaction chamber bottom plate with the hollow interior is arranged at the bottom of the reaction chamber, and a gas exhaust port is formed in the reaction chamber bottom plate; an ozone inlet is formed in the outer side wall of the reaction chamber and is communicated with the hollow position of the bottom plate of the reaction chamber. By using the device for bleaching the slurry with the ozone, the slurry can be bleached by fully utilizing the ozone, and the problems of low ozone utilization rate and the like caused by poor uniformity and large heat productivity of the slurry bleached with the ozone can be solved.

The purpose of the present invention is to provide a method for producing recycled pulp fibers such that articles using the recycled pulp fibers can easily achieve a uniform whiteness and users are not prone to feel psychological resistance to articles using the recycled pulp fibers. This method is described below. The method is characterized by involving: a step for supplying, from a mixed solution supply port (32) to a treatment tank (31), a mixed solution (51) which contains superabsorbent polymers and pulp fibers derived from multiple types of used sanitary products; a step for supplying an ozone-containing gas (53) from an ozone-containing gas supply port (43) to a treatment solution (52) inside of the treatment tank (31); a step in which, by raising the ozone-containing gas (53) while lowering the superabsorbent polymers and pulp fibers in the treatment tank (31), the ozone-containing gas (53) is brought into contact with the superabsorbent polymers and the pulp fibers, and the pulp fibers are bleached to form recycled pulp fibers; and a step for discharging the treatment solution (52) from a treatment solution discharge port (33), wherein the recycled pulp fibers have a 0-10ΔYI with respect to a standard white plate.

A system for mixing a treatment medium into a slurry includes: a mixer configured to mix the slurry and the treatment medium; a plurality of walls defining a plurality of channels; a slurry source fluidly coupled to each of the channels; and a treatment medium source providing a portion of the treatment medium to each of the channels. The mixer includes a mixing chamber, a mixer inlet fluidly coupled upstream of the mixing chamber, and a mixer outlet fluidly coupled downstream of the mixing chamber. Each of the channels is fluidly coupled to the mixer inlet. The slurry source provides a portion of the slurry to each of the channels. Each of the channels provides that portion of the slurry and that portion of the treatment medium to the mixer inlet.

The invention relates to the technical field of papermaking, and discloses a method for preparing cardboard paper by using composite mineral fibers, which comprises the following steps: dispersion and micro-nano treatment of attapulgite, preparation of a chitosan-attapulgite composite material, preparation of composite mineral fibers, paper pulp mixing and papermaking. Through micro-nanocrystallization treatment of attapulgite and coating modification of chitosan, the binding force of the composite mineral fiber and the paper pulp fiber is remarkably enhanced, and the mechanical properties such as tightness, burst index and ring crush index of finished paper are superior to those of standard requirements; besides, by adding the composite mineral fibers, fine fibers in the white water are removed, the fiber retention rate is increased, part of paper pulp fibers can be replaced, use of chemical auxiliary materials is reduced, the production cost is reduced, the production efficiency and the finished paper quality are improved, and the clean papermaking purposes of quality improvement, efficiency improvement and pollution reduction are achieved. Therefore, considerable economic benefits and social benefits are obtained.

The invention relates to a method for producing cellulose pulp with increased Kappa value, lignin content, strength and stiffness, wherein said method does not include a bleaching step. A cellulose pulp obtained by the method, use thereof and paper packaging obtained from said cellulose pulp are also disclosed.

The present invention relates to a method for manufacturing a cellulose pulp composition for a moldable cellulose fiber-based web, said method comprising: a) providing a cellulose pulp composition comprising at least 50 wt% chemical or semi-chemical wood pulp based on dry weight, b) subjecting the cellulose pulp composition provided in step a) to low consistency (LC) refining at a consistency in the range of 1-7 wt% to an SR value in the range of 18-50 as determined by standard ISO 5267-1, c) subjecting the LC-refined cellulose pulp composition obtained in step b) to high consistency (HC) refining at a consistency in the range of 12-40 wt% with a refining energy of at least 150 kWh / t, and d) diluting the HC-refined cellulose pulp composition obtained in step c) to a consistency in the range of 0.1-10 wt%. The invention further relates to a method for manufacturing a moldable cellulose fiber-based web and a method for manufacturing a molded cellulose fiber-based product.

A plate-type ozone generator includes a first ground electrode plate, second ground electrode plate, central plate and reactor middle frame arranged between first end and second end of plate-type ozone generator, wherein the central plate houses the reactor middle frame that is moveable from centre of central plate. The frame includes a high-voltage electrode plate, first dielectric barrier plate and second dielectric barrier plate, first gap being formed between first dielectric barrier plate and first ground electrode plate and second gap being formed between second dielectric barrier plate and second ground electrode plate. The first gap and second gap are filled with gas. A power source is used to charge the first ground electrode plate, second ground electrode plate, and high-voltage electrode plate. Dielectric barrier discharge occurs for generating ozone.

In a process for oxidation of white liquor, in particular of white liquor used in a process for production of paper or cellulose, the oxygen required for the oxidation is supplied to the reactor or the reactors in which the oxidation is carried out at least partially in the form of oxygen-containing nanobubbles. Due to the relatively long lifetime of the nanobubbles this very efficiently provides oxygen also for oxidation reactions in the white liquor proceeding at different rates.

To provide a method for producing recycled pulp fibers whereby, articles using recycled pulp fibers tend to have uniform whiteness, and the articles using recycled pulp fibers hardly give a feeling of psychological resistance to a user.SOLUTION: The method has a step of supplying a mixed solution 51 containing a superabsorbent polymer and pulp fibers derived from used plural types of hygiene articles to a treatment tank 31 from a mixed solution supply port 32, a step of supplying an ozone-containing gas 53 from an ozone gas supply port 43 to the treatment liquid 52 in the treatment tank 31, a step in which, by raising the ozone-containing gas 53 while lowering the superabsorbent polymer and pulp fiber in the treatment tank 31, the ozone-containing gas 53 is brought into contact with the superabsorbent polymer and pulp fiber, to bleach the pulp fiber to form recycled pulp fibers, and a step of discharging the treatment liquid 52 from the treatment liquid discharge port 33, wherein the recycled pulp fibers have ΔYI of 10 or less with respect to a standard white plate.SELECTED DRAWING: Figure 2

[PROBLEM] To provide unmodified cellulose beads which achieve both textures and soft-focus properties suitable for use in cosmetics, and a production method therefor.[SOLVING MEANS] Unmodified cellulose beads for mixing into a cosmetic, having an average particle diameter (D50) of 1 to 20 μm, an average particle diameter (D10) of 4.0 μm or less, an average particle diameter (D20) of 6.0 μm or less, and an average particle diameter (D90) of 30.0 μm or less, wherein a standard deviation (SD) of average particle size divided by the average particle diameter (D50) (SD / D50) is 0.4 to 1.5.

The present disclosure relates to a method of treating an aqueous foamable medium, such as a process stream of a pulping and paper mill, comprising contacting the aqueous process stream with a defoaming agent comprising: a) at least one C12 to C40 Guerbet alcohol; and / or b) at least one polyol ester.

The invention relates to the technical field of plant fiber processing, and discloses a step processing method and system of plant fiber superfine powder, a product and application, the superfine powder is composed of 85.2%-91.2% of cellulose, 1.2%-2.9% of ash and the balance of lignin and hemicellulose; the particle surface has a microporous structure formed by steam explosion, and the average length-diameter ratio is 21-32; the processing method comprises the following steps: carrying out steam explosion on a pretreated raw material to dissociate a physical structure; purifying cellulose through alkali treatment and removing impurities; supersonic airflow crushing and turbine grading are carried out in a controlled low-temperature and inert gas environment; the superfine powder is applied to a polylactic acid-based composite material, a physical anchoring site is formed by utilizing surface micropores and a matrix, and a stress transfer network is constructed in the matrix by virtue of a length-diameter ratio structure, so that the interface bonding strength, the mechanical property and the thermal stability of the composite material are effectively improved.

The present invention relates to the field of cotton pulp technology, and in particular to a method for preparing cotton pulp for pharmaceutical and food-grade cellulose ether. The cotton pulp of the present invention is prepared by material selection, cotton opening, impurity removal; cellulose purification with the help of biological enzymes; alkali preparation, impregnation, selective removal of hemicellulose and lignin cooking; pre-sanding; pre-pulping; concentration; hydrogen peroxide bleaching; acid treatment; post-sanding; post-pulping; and papermaking. The cotton pulp has a degree of polymerization of 2500-2600 and a whiteness of ≥84%, which can make the pharmaceutical and food-grade cellulose ether have ultra-high viscosity, high degree of substitution, excellent solubility, and improve the quality of the pharmaceutical and food-grade cellulose ether. The use of the cooking technology for selective removal of hemicellulose and lignin and the cellulose purification technology with the help of biological enzymes to produce cotton pulp for pharmaceutical and food-grade cellulose ether can also make the COD discharge of wastewater in the entire pulping process between 6000 and 10000 mg / L, reducing the pressure on sewage treatment.