54results about "Multistage pulping process" patented technology

Methods and systems for preparing agricultural residue or other agricultural feedstock for use as a pulp. The method includes providing non-wood agricultural residue (e.g., corn stover) or other agricultural feedstock that includes agricultural fibers, chemically pulping the agricultural fibers in a preliminary alkaline chemical pulping process at a low consistency and at a low temperature to produce partially pulped agricultural fibers, such step including separating lignin and hemicellulose from the partially pulped agricultural fibers, introducing the partially pulped agricultural fibers into a first reactor, wherein the first reactor operates at a low temperature of less than 100° C. (e.g., 65° C.), introducing the agricultural fibers from the first reactor into a second reactor, where the second reactor operates at a low temperature, of less than 100° C. (e.g., 94-96° C.), the second reactor operating at a higher temperature than the first reactor, to produce pulped agricultural fibers.

The invention discloses sugarcane syrup suitable for lyocell fiber production and a preparation method and system of the sugarcane syrup, and belongs to the technical field of lyocell fiber production. According to the present invention, the sugarcane pulp for lyocell fiber production is prepared sequentially through the first high-concentration alkali treatment, the second low-concentration alkali treatment, the bleaching, the acid washing and the drying, and the processes are matched for use, such that the conditions are milder compared with the traditional pulping and papermaking cooking process and the oxygen delignification, the equipment requirement is low, the production energy consumption is low, and the operation is safe; according to the present invention, the raw material does not need to be crushed, the index of the finally prepared raw material can meet the Lyocell production requirement, the operation process is simple, the industrial application prospect is provided, the production system matched with the method is provided, and the industrial and continuous production of the sugarcane syrup suitable for Lyocell fiber production is achieved.

In one example, a process includes providing a system with a first vessel and a second vessel; providing a biomass comprising lignin, hemicellulose and cellulose fibers into said first vessel; providing an aqueous acidic composition comprising an acid; providing a modifier component; providing a peroxide component; exposing said biomass to said sulfuric acid, modifier and peroxide components, creating a reaction mass; mixing said reaction mass; and allowing said sulfuric acid component and peroxide component to come into contact with said biomass for a period of time sufficient to a delignification reaction to occur and remove a pre-determined amount of said lignin from said biomass. The pre-determined amount may be assessed by determining a first remaining peroxide concentration in the reaction mass, with a suitable apparatus, when said first remaining peroxide concentration is reached, the biomass is transferred to said second vessel.

A piece of natural plant material is subjected to one or more chemical treatments to remove substantially all lignin therefrom, thereby allowing the extraction of delignified, cellulose-based fibers. For example, the natural plant material can be a grass, such as bamboo or gladiolus. Subsequent drying of the extracted fiber densifies the structure, yielding improved mechanical properties. In some embodiments, the extracted fibers can be used, either alone or in combination with other materials, as a structural material. For example, the extracted fibers can be embedded within, infiltrated with, coated by, or otherwise combined with a polymer or concrete to form a composite material.

According the present disclosure, there is provided an aramid pulp and a method for manufacturing the same, in which a completely dried, oilless aramid yarn that has not been applied with a general spinning oil agent is used, and thus the water dispersion and swelling time of the fiber can be reduced as compared with a conventional case, thereby providing an aramid pulp that is improved in productivity and pulp properties and excellent in interfacial adhesion force with different materials.

Disclosed are improved non-woody slurries, in particular non-woody slurries prepared from plants of the family Aspartate, and more particularly one or more plants of the genus Yucca, and methods of making the same. The method of manufacture generally includes at least one mechanical processing stage, such as mechanical refinement, without adding chemicals to the biomass. In some cases, the biomass may be subjected to two stages of refinement where the consistency of the biomass differs between the stages such that the first refinement stage may be performed at a consistency in the range of about 8% to about 12% and the second stage may be performed at a consistency in the range of about 3% to about 4%. The resulting non-wood slurry has a high degree of freeness, such as freeness in the range of 500 mL to 600 mL, and a relatively moderate degree of tensile strength, such as a tensile index of about 50 or less.

This invention provides a low-cost and environmentally friendly papermaking pulping process, comprising the following steps: S1. Pretreatment of papermaking fiber plant raw materials. S2. Oxy-alkali cooking: The pretreated papermaking fiber plant raw materials are mixed with an aqueous sodium carbonate solution, and cooked for 0.5–5 hours using oxygen as an oxidant. Then, sodium hydroxide is added, and cooking continues for 0.3–2 hours. Finally, the pulp and black liquor are separated by pressing. S3. Black liquor treatment: The black liquor is mixed with fiber waste, pressed, and burned as biomass fuel. S4. Recovery and causticization. This papermaking pulping process uses sodium carbonate and a small amount of sodium hydroxide for staged oxy-alkali pulping, and the generated black liquor is mixed with fiber waste and burned to recover sodium carbonate and heat, reducing the causticization rate and pulping costs.

A preparation method and cyclic treatment method for a high-strength, high-toughness and recyclable bionic structure fiberboard. The preparation method and cyclic treatment method for a fiberboard involved in the present invention solve the problem in the prior art of impossible preparation of green, environmentally-friendly, high-strength, high-toughness and recyclable bionic structure fiberboards. The preparation method comprises: 1, pretreatment; 2, swelling treatment; 3, dissociation and dispersion treatments; 4, centrifugal treatment; 5, hydrogel construction; and 6, densification treatment. The cyclic treatment comprises: placing a high-strength, high-toughness and recyclable bionic structure fiberboard in a crusher for crushing treatment, and then repeating swelling treatment, dissociation and dispersion treatments, centrifugal treatment, hydrogel construction and densification treatment. The present invention is used for preparation and cyclic treatment of high-strength, high-toughness and recyclable bionic structure fiberboards.

The subject invention pertains to an in-situ bioremediation system that employs a plant-derived biomimetic nano-framework to achieve highly efficient adsorption and subsequent microbial biotransformation of contaminants synergistically. The multiple component framework is presented as Renewable Artificial Plant for In-situ Microbial Environmental Remediation (RAPIMER). RAPIMER exhibits record adsorption capacity for contaminants, such as PFAS compounds, and diverse adsorption capability for other co-contaminants. Subsequently, RAPIMER provides the substrate for in situ bioremediation via microorganisms, such as Irpex lacteus, and can promote PFAS detoxification. RAPIMER arises from cheap lignocellulosic sources, enabling a broader impact on sustainability and a new means for low-cost pollutant remediation.

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

The present application relates to the technical field of chemical fibers, and discloses a process for preparing lyocell pulp by mixing bamboo and wood pulp, comprising the following steps: bamboo pretreatment: cutting and shaping the bamboo, and then sequentially performing steam explosion defibration, acid treatment directional silicon removal and biological enzyme assisted delignification; wood pulp pretreatment: sequentially performing airflow sorting impurity removal, low-temperature alkali refining degreasing and biological enzyme deep purification; through the step-by-step directional pretreatment strategy, steam explosion causes microcracks in the cell wall of the short-cut bamboo fibers, and the high selectivity of the oxalic acid-ammonium fluoride composite acid liquid to silicate is used to achieve deep silicon removal of the short-cut bamboo fibers without damaging the cellulose skeleton; at the same time, the biological enzyme system step-by-step dissociates the hemicellulose side chain and the lignin aromatic ring structure, and removes the soluble oligomers, so that the risk of spinning blockage caused by silicon residues is eliminated under the premise of retaining the high polymerization degree cellulose of the bamboo, and the solubility of the pulp in the NMMO solvent is ensured.

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 provides a preparation method of kudzuvine root residue nano cellulose, which comprises the following steps: putting kudzuvine root residue and a NaOH solution in a high-pressure digester for high-pressure alkali boiling, then washing with water, filtering to be neutral, and pulping; carrying out oxidation bleaching on the slurry by using NaClO2 under an acidic condition, then washing with water, filtering to be neutral, and drying to obtain a primary cellulose product of the radix puerariae residue; placing the dried material and dilute sulphuric acid in a high-pressure digester for high-pressure acidolysis, and then centrifugally washing to be neutral; preparing a suspension from the washed material, firstly performing high-speed shearing, and then performing micro-jet homogenization to obtain a radix puerariae residue nanocellulose suspension; concentrating and freeze-drying to obtain the radix puerariae residue nano cellulose. The preparation method of the kudzuvine root residue nanocellulose is short in preparation period, high in yield and small in pollution, and the prepared kudzuvine root residue nanocellulose has good emulsifying performance.

The invention relates to the technical field of chemical fibers, and discloses a process for preparing lyocell pulp by mixing bamboo wood and wood cotton and carrying out directional treatment, which comprises the following steps: bamboo wood pretreatment: sequentially carrying out steam explosion splitting, acid treatment directional silicon removal and biological enzyme assisted delignification on the cut and formed bamboo wood; the raw material wood cotton is sequentially subjected to airflow separation and impurity removal, low-temperature alkali refining and degreasing and biological enzyme deep purification; through a step-by-step directional pretreatment strategy, micro cracks are generated on cell walls of the chopped bamboo fibers through steam explosion, and deep silicon removal of the chopped bamboo fibers is realized without damaging a cellulose skeleton in cooperation with the high-selectivity dissolving capacity of oxalic acid-ammonium fluoride composite acid liquor to silicate; meanwhile, a hemicellulose side chain and a lignin aromatic ring structure are dissociated step by step by a biological enzyme system, and soluble oligomers are removed, so that the spinning blockage risk caused by silicon residues is eliminated on the premise that high-polymerization-degree cellulose of bamboo wood is reserved, and the dissolution smoothness of pulp in an NMMO solvent is guaranteed.

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 discloses a paper pulp raw material with high lignin content as well as a preparation method and application thereof. The paper pulp raw material contains lignin, cellulose and hemicellulose; the water content is 60%-80%; the mass of the lignin accounts for 25%-45% of the dry weight of the paper pulp raw material, the mass of the cellulose accounts for 50%-70% of the dry weight of the paper pulp raw material, the mass of the hemicellulose accounts for 5%-25% of the dry weight of the paper pulp raw material, and the dry weight of the paper pulp raw material refers to the weight of the paper pulp raw material except water; the paper pulp raw material is prepared by cooking plant log with black liquor and grinding, the black liquor is liquid obtained by cooking the pulping raw material with alkali liquor, grinding and performing solid-liquid separation, or liquid obtained by adding alkali into washing liquid obtained by washing solids obtained by performing solid-liquid separation after cooking the pulping raw material with alkali liquor, grinding and performing solid-liquid separation; the pulping raw material is selected from coniferous wood, broadleaf wood or bamboo. The pulp raw material can be used for preparing paper, paperboards or pulp molded products.

According to an example aspect of the present invention, there is provided a method of treating a fibrous raw-material containing cellulosic fibres and polyester fibres, comprising the steps of subjecting the raw-material to acid treatment and to a washing operation, subjecting the washed first modified fibrous raw-material to an alkaline treatment to dissolve at least a portion of the polyester fibres and to form a second modified fibrous raw-material that is subjected to separation to separate solid matter from an aqueous liquid phase comprising dissolved material, recovering the solid matter of the separation, subjecting the recovered second modified raw-material to a washing, subjecting the liquid phase to a first filtration step using a micromembrane to obtain a first aqueous permeate, subjecting the first permeate to a second filtration step using a nanomembrane to obtain a second permeate, recovering the second aqueous permeate and recycling it to an alkaline treatment step.

The present invention includes a method for dissolving cellulose comprising dissolving cellulose in an ionic liquid and a co-solvent, wherein the ionic liquid is an imidazolium-based ionic liquid with, e.g., a halide or acetate as the anion.

A piece of natural plant material is subjected to one or more chemical treatments to remove substantially all lignin therefrom, thereby allowing the extraction of delignified, cellulose-based fibers. For example, the natural plant material can be a grass, such as bamboo or gladiolus. Subsequent drying of the extracted fiber densifies the structure, yielding improved mechanical properties. In some embodiments, the extracted fibers can be used, either alone or in combination with other materials, as a structural material. For example, the extracted fibers can be embedded within, infiltrated with, coated by, or otherwise combined with a polymer or concrete to form a composite material.

The invention relates to an energy-saving and environment-friendly intermittent pulping and cooking process which comprises the following steps: performing stepped heating type cooking on wood chips and cooking liquor to prepare slurry; after cooking is finished, reverse heat exchange is conducted on the dilute black liquor and the pulp, and hot black liquor is replaced; then, dilute black liquor is introduced again, and warm black liquor is replaced; the warm black liquor can be used as a material for preparing the cooking liquor; the hot black liquor is subjected to flash evaporation to remove 10-15% of moisture, the concentration of the hot black liquor is increased to 18-21 Be degrees, and the flash-evaporated hot black liquor firstly enters a quadruple-effect down-flow multi-effect evaporator to be concentrated to 28-30 Be degrees and then enters a sextuple-effect falling film evaporator to be concentrated to 65% or above; wherein secondary steam generated by flash evaporation is used as a first-effect heat source of the quadruple-effect down-flow multi-effect evaporator after liquid drops are removed through the steam-water separator. According to the method, flash secondary steam is combined to drive the first effect of the multi-effect evaporator, hot black liquor pretreatment concentration optimization alkali recovery and the like, so that energy gradient utilization is sufficient, comprehensive energy consumption is greatly reduced, and the win-win situation of environmental protection and resource recycling is achieved.

Disclosed are improved non-wood pulps, particularly non-wood pulps prepared from plants of the family Asparagaceae and more particularly one or more plants of the genus Hesperaloe, and methods of producing the same. The manufacturing processes generally comprise at least one mechanical treatment stage, such as mechanical refining, without the addition of chemicals to the biomass. In certain instances, the biomass may be subjected to two stages of refining where the consistency of the biomass differs between the stages, such that the first refining stage may be performed at a consistency ranging from about 8% to about 12% and the second stage may be performed at a consistency ranging from about 3% to about 4%. The resulting non-wood pulps have a high degree of Freeness, such as Freeness ranging from 500 mL to 600 mL and a relatively modest degree of tensile strength, such as a Tensile Index of about 50 or less.

The invention discloses a system and method for extracting cellulose, lignin and hemicellulose.The system comprises pretreatment equipment, an extractor, a solvent tank, a solvent recovery system, a spraying bin, a dissolution and removal tower, a hydrolysis pool, an enzymolysis pool, purification equipment and a dryer. The solvent recycling system is used for realizing the recycling of the solvent, the pollution of the traditional black liquor is avoided, the emission is reduced through tail gas absorption and dust removal equipment, and the recycled condensate water can be recycled, so that the environmental protection benefit is obviously improved; meanwhile, hemicellulose is converted into xylooligosaccharide with high additional value, and the product quality is ensured and the resource value is greatly improved through multi-step purification such as filtration, decoloration and evaporation.

The present invention relates to a method for producing refined cotton in an efficient, environmentally friendly and energy-saving manner, comprising the following steps: S1, selecting high-quality cotton linters; S2, preparing a cooking liquid: the main components of the cooking liquid include sodium hydroxide and water, and the cooking aids include ethanol, biological enzymes, hydrogen peroxide, and a regulator; the proportion of sodium hydroxide to cotton linters is 30-40%, the proportion of water to cotton linters is 40-50%, the proportion of ethanol to cotton linters is 10-15%, the proportion of biological enzymes to cotton linters is 9-12%, the proportion of hydrogen peroxide to cotton linters is 8-10%, and the proportion of the regulator to cotton linters is 3-6%; the use steps of the cooking liquid: a, large liquid ratio penetration: using alkali liquid with a ratio of 1:4 of cotton linters to cooking liquid to penetrate cotton linters, b, small liquid ratio cooking: using a ratio of 1:2 of cotton linters to cooking liquid to perform small liquid ratio alkali cooking of cotton linters, c, hydrogen peroxide bleaching. The alkali liquid cooking process of the cotton linters of the present invention is not only optimized, but also has achieved remarkable results in terms of environmental protection and efficiency.

There is provided a method of preparing chemithermomechanical pulp (CTMP), said method comprising the steps of: pre-impregnating wood chips with a pre-impregnation liquid to obtain pre- impregnated wood chips; feeding the pre-impregnated wood chips to an impregnation zone comprising an impregnation liquid comprising sulfite and / or alkali using a plug screw such that the pre-impregnated wood chips expand in the impregnation zone and absorbs the impregnation liquid, thereby providing impregnated wood chips; transferring the impregnated wood chips to a heating zone without compressing the impregnated wood chips; heating the impregnated wood chips in the heating zone with steam having a temperature of above 140 °C, such as at least 150 °C, such as at least 160 °C, to obtain pre-treated wood chips; and defibration of the pre-treated wood chips, wherein the residence time in the heating zone is no more than two minutes.

According the present disclosure, there is provided an aramid pulp and a method for manufacturing the same, in which a completely dried, oilless aramid yarn that has not been applied with a general spinning oil agent is used, and thus the water dispersion and swelling time of the fiber can be reduced as compared with a conventional case, thereby providing an aramid pulp that is improved in productivity and pulp properties and excellent in interfacial adhesion force with different materials.