32 results about "Black liquor" patented technology

Methods, apparatuses, and systems for extracting lignin from non-wood black liquor are disclosed. The non-wood black liquor is heated to a first temperature to degrade hemicelluloses contained therein. The liquid is then cooled to a second temperature. The pH of the cooled liquid is chemically reduced to precipitate lignin from the liquid. The liquid is filtered to separate the precipitated lignin from the liquid.

The application discloses a preparation method of a pesticide lignosulfonate sodium dispersant composition and belongs to the technical field of dispersants. The method comprises the following steps: S1, taking papermaking black liquor as raw material, performing standing precipitation, flocculation precipitation, membrane concentration and acid precipitation treatment to obtain purified lignin; S2, adding the purified lignin into water, adjusting the pH of the system to 10-11, then adding hydrogen peroxide to perform pre-oxidation, then adding formaldehyde and sodium sulfite to perform sulfomethylation reaction, and adding formaldehyde to perform polycondensation reaction; cooling and discharging, and performing spray drying to obtain lignosulfonate sodium; and S3, adding the lignosulfonate sodium and 1-ethyl-3-methyl imidazolium L-lactate into water and stirring and uniformly mixing, adding stevioside to perform ultrasonic treatment, forming a homogeneous system, and performing spray drying to obtain the pesticide lignosulfonate sodium dispersant composition. The lignosulfonate sodium dispersant composition can effectively improve the pesticide dispersion stability and pesticide biological activity, and meets the pesticide use requirement.

This invention discloses a rice straw-based liquid mulch film emulsion, its preparation method, and its application. The preparation method includes: treating pretreated rice straw with an alkaline solution in sodium hydroxide to obtain rice straw fibers and a silicon-containing black liquor; washing and bleaching the rice straw fibers to obtain bleached rice straw fibers; allowing the silicon-containing black liquor to stand, adjusting the pH value, and allowing it to stand again to obtain a silicon-containing dispersion; mixing and activating the bleached rice straw fibers with an alkaline alcohol solution, followed by etherification with chloroacetic acid to obtain carboxymethyl cellulose; mixing polyvinyl alcohol and carboxymethyl cellulose solutions, adding the silicon-containing dispersion under stirring, and then adding water to obtain the rice straw-based liquid mulch film emulsion. The rice straw-based liquid mulch film emulsion prepared by this invention can be used for soil covering in cultivated soils, exhibiting excellent film-forming strength, toughness, light-blocking properties, and soil cover adaptability. It has a wide range of raw material sources, a simple preparation process, and is suitable for large-scale promotion.

The present invention relates to a method for preparing cross-linked lignin in the form of particles using hydrothermal treatment with a liquid made from black liquor, comprising lignin and a cross-linking agent or a precursor thereof, and having an electrical conductivity of more than 15 mS / cm, preferably more than 25 mS / cm to 400 mS / cm. The present invention also relates to cross-linked lignin produced using the above-mentioned method. The present invention also relates to cross-linked lignin particles having a glass transition temperature Tg of at least 160°C or no glass transition temperature and a STSA surface area of at least 10 m 2 / g. The present invention also relates to rubber articles, in particular industrial rubber articles or tires, comprising cross-linked lignin particles as filler.

This invention discloses a method for preparing hard carbon derived from the aerial roots of banyan trees, belonging to the field of new energy materials technology. The method includes the following steps: Step 1: Freshly cut banyan aerial roots are washed, dried, crushed, and sieved; Step 2: Choline chloride (ChCl) and lactic acid (LA) are mixed in a certain proportion to prepare DES; Step 3: The DES from Step 2 is mixed with the banyan aerial root powder from Step 1 and reacted, then subjected to delignification. The delignified black liquor is washed with anhydrous ethanol and deionized water and filtered to obtain a filter cake, which is then dried in an oven; Step 4: The filter cake from Step 3 is ground into powder and calcined at a medium-low temperature to obtain pre-carbonized banyan aerial root powder; Step 5: The pre-carbonized powder from Step 4 is calcined at a medium-high temperature, acid-washed, and dried to obtain banyan aerial root-derived hard carbon. This invention discloses a green, environmentally friendly, and high-performance method for preparing derived hard carbon, applicable to battery anode materials, realizing the high-value utilization of biomass waste.

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.

The application discloses an acid pickling corrosion inhibitor prepared based on bamboo pulp papermaking black liquor, and a preparation method and application thereof, and relates to the technical field of acid pickling corrosion inhibitors. The method comprises the following steps: (1) adding concentrated sulfuric acid into the bamboo pulp papermaking black liquor, adjusting the pH value of the solution to 1-3, and then fully reacting, standing and settling, and separating to obtain a precipitate A and a filtrate A; the precipitate A is washed and dried to obtain lignin; (2) the filtrate A is concentrated through multi-effect vacuum reduced pressure evaporation to obtain a precipitate B; (3) the precipitate B is extracted through sewage ethanol extraction, suction filtration and washing to obtain an ethanol extraction liquid and a precipitate C; the ethanol extraction liquid is distilled through reduced pressure distillation to obtain an ethanol extraction liquid; the precipitate C is recrystallized, and after removing solid inorganic salts, the precipitate C is distilled through reduced pressure distillation to obtain a distillation liquid; the ethanol extraction liquid and the distillation liquid are mixed, and then evaporated through reduced pressure evaporation and dried to obtain the acid pickling corrosion inhibitor.

This utility model relates to a black liquor concentration multi-effect evaporation tail gas recovery and utilization system, belonging to the field of energy-saving and environmental protection technology. The tail gas pipeline of the last effect of the multi-effect evaporation system is connected to the medium inlet on one side of the first heat exchanger. The other side of the first heat exchanger establishes black liquor medium circulation with the flash evaporator through a circulation pump. The exhaust steam generated by the flash evaporator enters the condenser through a channel. The flash evaporator is connected to the black liquor medium inlet of the multi-effect evaporation system through a black liquor discharge pipeline. A black liquor feed pipeline is provided on the other side of the first heat exchanger. This application significantly improves the energy cascade utilization efficiency and greatly reduces the overall energy consumption. The system recovers the waste heat of the tail gas of the last effect of the multi-effect evaporation system through the first heat exchanger, transferring the "waste heat energy" to the dilute black liquor to be concentrated, providing a heat source for the negative pressure flash evaporation of the flash evaporator; at the same time, the second heat exchanger realizes the heat exchange between the low-temperature feed dilute black liquor and the high-temperature pre-concentrated black liquor, tapping the potential for heat utilization.

The present invention is directed to fractionation of crude tall oil, which originates from the Kraft process black liquor. In the method according to the present invention, at least two strongly basic anion exchange resins are used to efficiently separate fractions from the crude tall oil.

This invention relates to the field of waste heat utilization technology, providing a heat pump system and pulp heating method for waste heat recovery from pulp black liquor. It addresses the problem that existing pulp black liquor waste heat recovery methods struggle to determine the lowest overall energy consumption heat extraction ratio and achieve stable heating. The invention includes a pulp heating method employing a heat pump system for pulp black liquor waste heat recovery. The pulp heating method includes the following steps executed periodically: S1, parameter acquisition; S2, heat calculation; S3, determination of a candidate heat extraction ratio set; S4, calculation of a comprehensive objective function; S5, load allocation; and S6, dynamic protection and recovery control. The pulp heating method proposed in this invention can simultaneously consider energy saving, heating stability, and a safe heat extraction boundary on the black liquor side during black liquor waste heat recovery. By selecting the candidate heat extraction ratio with the lowest comprehensive objective function value from the candidate heat extraction ratio set, dynamic load allocation can be achieved between heat pump heating, compensation branch heating, and bypass protection.

This invention relates to the field of comprehensive utilization of biomass resources, and discloses a pretreatment process for the efficient resource utilization of crop straw, comprising: mixing and impregnating crushed straw particles with a high-concentration solubility buffer; adding solid tetraacetylethylenediamine and flowing hydrogen peroxide solution for oxidation reaction; performing hot solid-liquid separation under no-cooling conditions, washing the filter cake to obtain cellulose enrichment, and combining the washing liquid with primary hot black liquor to obtain mixed black liquor; cooling the mixed black liquor to induce a phase change, separating lignin and cold mother liquor, discharging part of the cold mother liquor, and recycling the remaining mother liquor. This invention improves the separation efficiency of straw components by constructing a stable pretreatment reaction microenvironment through composition; prevents secondary lignin adhesion and achieves lignin precipitation by controlling the hot separation and cold phase change operations; and reduces the overall water and reagent consumption of the process by combining the mother liquor circulation design.

The utility model discloses a black liquor processing device in corrugated paper production, include: combustion furnace, drying box and vacuum pump, and the one end of combustion furnace is fixedly connected with the conveying pipe, and the one end of conveying pipe is fixedly connected with dust removal tank, and the front of dust removal tank is rotatably connected with the door through the hinge, and dust collection box is placed in the dust removal tank, and the movable plug -in of dust collection box inside has the portal plate, the utility model discloses after the filter mechanism one is inserted into the portal plate and inserts the dust collection box, and the filter mechanism two then inserts in the dust collection box through bag filter and is pasted with the back of portal plate, and then uses the mounting block and bolt fixed, and then installs each component into dust removal tank, makes the portal plate cover the conveying pipe port, when the flue gas enters the dust removal tank, first through the filter screen contact of portal plate and filter mechanism one, and the big particle dust is intercepted and falls to the dust collection box, and the flue gas after preliminary filtration enters the bag filter of filter mechanism two, and the submicron level dust is captured through its fine filter bag, and double -layer filtration effectively separates most dust.

This utility model discloses an energy-saving device for high-concentration black liquor evaporation and concentration, including a concentrator body. A steam exhaust pipe is located at the top of the concentrator body. A heating coil is located inside the concentrator body, with a steam inlet pipe connected to the bottom of the heating coil and a steam exhaust pipe connected to the top. Both steam exhaust pipes are connected to a steam recovery pipe. The device also includes a heating water tank, with the steam recovery pipe connected to the bottom. Multiple partitions are installed inside the heating water tank, and these partitions are staggered. This utility model heats the water in the heating water tank by recovering the steam generated by the concentrator body and the waste heat from the steam at the tail end of the heating coil. This allows for continuous and efficient absorption of heat from the steam, avoiding excessive heat loss during the recovery process and enabling step-by-step, thorough recovery of heat from the steam. Furthermore, the overall structure does not consume external energy, making it energy-saving and environmentally friendly.

The application discloses a method for fractionating lignin in wheat straw pulping black liquor by using a series of cationic polyacrylamides, and a series of polyacrylamides containing different cations and different cationic degrees are synthesized by a copolymerization method. By adding the polyacrylamides with different cationic degrees in sequence and centrifuging lignin components, the effect of fractionating and precipitating lignin with different molecular weights and hydrophilic or hydrophobic properties in the black liquor is achieved, so that lignin components with different molecular weight intervals and different hydrophilic or hydrophobic properties are obtained, which is beneficial to subsequent utilization of the lignin products.

The application provides a preparation method of a bio-based polyol, wherein the method comprises: mixing a solid solute with an acidic solvent to obtain an acidic black liquor; adding a polyol solvent to the acidic black liquor, and then performing evaporation and filtration to obtain an intermediate; and adding a neutralizing agent to the intermediate to obtain a bio-based polyol. The bio-based polyol prepared by the method provided in the application has a viscosity of at least 4.7, which is much better than the prior art. The polyol prepared by the method provided in the application successfully overcomes the problem of high viscosity or solid state caused by the rigid structure of traditional lignin-based polyols while maintaining a high bio-based content.

The utility model belongs to straw technical field, concretely relates to a kind of straw pulping black liquor alkali recovery evaporation crystallization equipment, including evaporation crystallization kettle, the center end of evaporation crystallization kettle is equipped with stirring motor, the bottom of evaporation crystallization kettle is equipped with discharge gate, three supports are welded around the discharge gate at equal intervals, the utility model, when using, two springs will push the one end of inner disc upward, so that inner disc can rotate in the inside of outer disc by the side lever of both sides. So the side of inner disc equipped with extension mouth will be turned down, at this moment, when black liquor alkali crystallization in evaporation crystallization kettle is discharged, it will fall on guide pad. Then black liquor alkali crystallization rolls to extension mouth along the inclination angle of inner disc and guide pad, at this moment, black liquor alkali crystallization recovery personnel only need to place the container prepared in advance at the bottom of extension mouth, can realize the function of automatic recovery black liquor alkali crystallization, to improve the convenience when evaporation crystallization kettle crystallization recovery is used.

The application discloses a microwave-assisted preparation method of a lignin sulfonate dye dispersant, and belongs to the technical field of dye dispersants. The preparation steps are as follows: purified lignin is prepared by taking papermaking black liquor as raw material; the purified lignin is dispersed in water, the pH value is adjusted to 10-12, and then the purified lignin is transferred to a microwave reaction kettle; formaldehyde and sodium sulfite are added, and a microwave-assisted heating mode is adopted to perform reaction, so that sulfonated lignin is prepared; the sulfonated lignin is added into water, the pH value is adjusted to 5, and under the protection of nitrogen, acrylic acid is added, sodium bisulfite solution is added dropwise, and ammonium persulfate solution is added dropwise; under the protection of nitrogen, the reaction is performed under light shielding and heating, so that an LS-AA grafting product is obtained; the LS-AA grafting product and polyethylene glycol diglycidyl ether are used as raw materials, a microwave heating mode is adopted to perform crosslinking reaction, and the lignin sulfonate dye dispersant is prepared. The application can improve the heat-resistant stability and dispersing force of the dispersant product, reduces the staining property, and achieves the resource recycling and product upgrading targets.

The present application is suitable for the technical field of microcrystalline cellulose and high polymerization degree cellulose preparation, and provides a combined preparation process of microcrystalline cellulose and high polymerization degree cellulose, which comprises the following steps: step (1), pretreatment; step (2), cooking; step (3), black liquor extraction; step (4), bleaching and pulp washing; step (5), grading; step (6), mixing, reaction and dilution; step (7), washing; step (8), pressure filtration and concentration; and step (9), drying, crushing and screening. The present application grades the bleached cellulose by using a grading screen, separates the component consisting of short fibers and miscellaneous cells which can produce microcrystalline cellulose and the single high polymerization degree cellulose component, then performs conventional acid hydrolysis and multi-stage countercurrent washing, concentration, drying and crushing on the short fiber and miscellaneous cell mixed component, and then grades the dried microcrystalline cellulose product by using various dry grading equipment, separates the acid hydrolysis microcrystalline cellulose product consisting of short fiber component for sale, and separates the acid hydrolysis microcrystalline cellulose component consisting of miscellaneous cell component for sale as a byproduct of special microcrystalline cellulose.

The application discloses a kind of flowing electrode liquid, preparation method, FCDI device and water treatment method, the device includes anode chamber, cathode chamber, electrode liquid retention chamber and water inlet chamber.Anode chamber and cathode chamber are equipped with current collector and ion exchange membrane, and the cavity filled with flowing electrode liquid is formed between the two.The flowing electrode liquid is made by mixing lignin biochar, conductive carbon black, electrolyte and water according to a certain mass ratio, wherein the lignin biochar is obtained by hydrothermal, catalysis, alkalization and acid separation of lignin extracted from papermaking black liquor.When working, wastewater is pre-filtered by nanofiltration membrane, and under the driving of electric field, ions pass through ion exchange membrane and are adsorbed by flowing electrode liquid, and saturated flowing electrode liquid is circulated to electrode liquid retention chamber for regeneration, while organic pollutants can be degraded by ultraviolet irradiation.The application uses low-cost and high-performance lignin biochar electrode, combines cascade filtration and online monitoring, and realizes efficient, continuous and pollution-resistant deep desalination and resource utilization of complex wastewater.

The application discloses a method for preparing water-soluble lignin chelated calcium fertilizer from concentrated black liquor, and belongs to the technical field of chelated fertilizer preparation.The technical points of the application are as follows: based on the hydrophilicity and chelation of small-molecule lignin in the black liquor, CO2 acid precipitation and calcium chloride chelation are used to prepare a new type of environmentally-friendly calcium fertilizer.The main technical points include: the black liquor is concentrated to a solid content of 30-50%, CO2 gas is introduced for acid precipitation reaction under certain conditions, the precipitate is separated by centrifugation, calcium chloride solid is added to the supernatant under stirring until no precipitate is generated, the precipitate is separated by centrifugation, anhydrous ethanol is added to the supernatant at a volume ratio of 1:1, the mixture is uniformly mixed and then centrifuged, the precipitate is washed with 50% ethanol solution and then dried to obtain the water-soluble lignin chelated calcium fertilizer.The application provides a water-soluble lignin chelated calcium fertilizer preparation technology which is simple, efficient, economical and has great industrialization potential, and opens up a new conversion path for conveniently and effectively converting natural high-molecular material lignin into efficient fertilizer.

The present application belongs to the technical field of lignin modification and chelate fertilizer preparation, and particularly relates to a method for preparing water-soluble lignin chelated calcium fertilizer based on iron-manganese double-site catalysts. The present application provides a special iron-manganese double-site catalyst for lignin oxidation modification of water-soluble lignin chelated fertilizer preparation. The catalyst can enhance the hydrophilicity of oxidized lignin and increase the effective chelating sites, thereby facilitating the formation of stable chelate structure with calcium source, so that the yield and calcium content of water-soluble lignin chelated fertilizer can be significantly improved. In addition, in the present application, papermaking black liquor is used as raw material, and functionalization and fertilizerization conversion of lignin can be realized under mild temperature range and controllable pressure oxidation conditions, which greatly improves the added value of waste liquid generated in papermaking, and is conducive to the coordinated development of black liquor resource utilization and functional fertilizer preparation industry.

This application discloses a high-performance filter paper and its preparation method, relating to the field of filter paper technology. The filter paper comprises 95-105 parts by weight of functional fibers and 2.6-3 parts by weight of responsive additives. The functional fibers include 38-42 parts by weight of modified softwood pulp and 7-9 parts by weight of modified nanocellulose. The modified softwood pulp is obtained by alkali treatment of bleached sulfate softwood pulp with 5% NaOH at a temperature of 48-50°C. The modified nanocellulose is obtained by in-situ synthesis of lignin from papermaking black liquor. This application achieves significant improvements in filtration accuracy, wet strength retention, and filtration speed through alkali treatment of modified softwood pulp and in-situ synthesis of modified nanocellulose from lignin in papermaking black liquor, while also utilizing resources. The synergistic effect of the responsive additives results in controllable cost and environmental friendliness.

This invention discloses a method for preparing liquid potassium humate fertilizer using cotton pulp black liquor, comprising the following steps: (1) cotton pulp black liquor raw material; (2) extraction of humic acid; (3) filtration and separation; (4) acidification and precipitation; (5) static aging; (6) centrifugation; (7) drying; and (8) preparation of potassium humate fertilizer. The advantages of this invention compared to existing technologies are: this method uses cotton pulp black liquor as raw material, which is extracted, filtered, acidified, statically aged, centrifuged, dried, and purified, then mixed with KOH and distilled water in a specific ratio to obtain liquid potassium humate fertilizer. This invention employs a normal temperature and pressure process, resulting in low energy consumption and safe operation, realizing the resource utilization of cotton pulp black liquor; the fertilizer obtained has a potassium oxide content of 0.8% and a humic acid content of 2.9%, which can improve soil and promote crop root growth, meeting the requirements of green agriculture and circular economy.

The application discloses a terpene polymerization catalyst resistant to papermaking black liquor impurity poisoning and a preparation method and application thereof, and belongs to the field of forest product chemical industry and catalysis technology. The catalyst comprises: a porous carbon carrier prepared from recovered lignin in papermaking black liquor by adjusting the pH of the lignin to 5.5-6.5 through acid, impregnating and activating the lignin in a phosphoric acid solution, and carbonizing the lignin at 350-450 DEG C for 4-6 h; an active component loaded on the porous carbon carrier; and an anti-poisoning modification layer coated on the surface of the catalyst, wherein the anti-poisoning modification layer is APTES. The application further provides a preparation method of the catalyst, a method for preparing terpene resin by using the catalyst, and application of the terpene resin in pressure-sensitive adhesive. The catalyst has excellent anti-poisoning capacity for lignin sulfonate and acetic acid complex impurities in recovered pinene in papermaking black liquor, and can stably polymerize in a wide range of mass ratios of alpha-pinene to beta-pinene of 60:40 to 90:10.

The embodiment of the invention provides a paper-making industry black liquor concentration system based on an open type evaporation absorption principle, and relates to the technical field of paper-making industry black liquor concentration. The black liquor concentration system comprises black liquor concentration circulation, sewage circulation, circulating air circulation, regeneration tower condensate water circulation, a steam supply process and an incineration and flue gas treatment process, light sewage, medium sewage and alkali furnace flue gas heat originally containing waste heat are fully utilized through the synergistic effect of all the circulation, and pre-concentration treatment and pre-heating treatment of black liquor are constructed through cooperation of multiple heat sources. And multi-effect steam is saved. And the black liquor concentration system reasonably distributes light sewage, medium sewage and heavy sewage, so that good pre-treatment is performed for wastewater discharge of an alkali recovery workshop.

This invention belongs to the field of lignin resource utilization technology and discloses a method for preparing vanillin by oxidative degradation of sulfate lignin with sodium percarbonate. The method includes the following steps: preparing sulfate lignin from pulping black liquor, wherein 1,4-dioxane is used to purify the sulfate lignin during the preparation process; dissolving the purified sulfate lignin in an alkaline aqueous solution of alcohol to obtain a raw material solution; adding sodium percarbonate to the raw material solution for oxidative degradation reaction; after the reaction, cooling the reaction solution, adding acid to adjust the pH to acidic, and separating the solid and liquid to obtain a supernatant containing vanillin. This method retains the highly reactive sites of lignin through 1,4-dioxane purification, and combines the synergistic effect of the sodium percarbonate green oxidation system and the alcohol / water two-phase solvent system to significantly improve the yield and selectivity of vanillin. Furthermore, the process is mild, environmentally friendly, controllable, and easily scalable.

This invention discloses a non-grain biomass pulping process that can replace hardwood pulp, belonging to the field of pulping and papermaking engineering technology. The invention includes: deep magnetic sieve purification and ultrasonic washing for precise water control and material preparation; low-temperature circulating dilute alkali soaking for gentle fiber swelling; gradient heating cooking for selective delignification while retaining residual alkali; countercurrent vacuum washing for efficient black liquor separation while preserving heat and alkali; direct contact with residual heat for oxygen removal; composite additives to protect fibers; and finally, hydrogen peroxide bleaching to medical-grade high whiteness; black liquor concentration and combustion with an added silica removal process for complete heat and alkali recovery; two-stage fine screening; differentiated refining; and the addition of a wet strength agent to produce a special pulp for medical dressings. This invention, through the chemical potential connection and fiber differentiation treatment across cooking and bleaching processes, enables the same batch of pulp to simultaneously achieve both wet strength and absorbency without using chlorine-containing bleaching agents.

A method of heating lignocellulosic material in a digester (20), comprising the steps of: transporting lignocellulosic material (4) as a slurry (2) comprising the lignocellulosic material and a liquid before the lignocellulosic material is added to the contents (14) of the digester, separating a major part of the liquid (6) from the slurry so that only a minor part of the liquid is added to the contents of the digester together with the lignocellulosic material, and heating the lignocellulosic material and the minor part of the liquid by steam before the lignocellulosic material and the minor part of the liquid are added to the contents of the digester, wherein the steam is flash steam generated by flashing black liquor withdrawn from the digester A digester system is also provided.

A method of generating flash steam by leading black liquor via a first conduit (28) from a digester (20) into a flashing vessel (40), accumulating at least part of the black liquor in a buffer volume (40) of black liquor in the flashing vessel, and withdrawing liquor from the buffer volume, heating the withdrawn liquor, and reintroducing the heated withdrawn liquor into the flashing vessel to generate flash steam. An arrangement (100) configured to generate flash steam from flashing black liquor withdrawn from a digester is also provided.