80 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.

The utility model relates to a multistage flash evaporation and vacuum low-temperature negative-pressure black liquor concentration system based on industrial waste heat, which belongs to the technical field of flash evaporation and comprises at least one heat exchange unit and at least two flash evaporation units sequentially connected in series. The concentration medium outlet of the flash evaporation unit located at the last effect is communicated with the concentration medium inlet of the heat exchange unit equivalent to the flash evaporation unit of the last effect located at the last effect, and when the number of the heat exchange units is at least two, the heat exchange units are sequentially connected in series. The flash evaporation unit located at the first effect communicates with the heat exchange unit equivalent to the flash evaporation unit located at the first effect through a heating unit. The concentration medium generated by the last-effect flash evaporation unit flows back to the previous-effect heat exchange unit to serve as a heat source, energy recycling is achieved, the requirement for external heat input is reduced, and therefore the energy efficiency of the whole system is improved; the plurality of heat exchange units which are sequentially connected in series can more effectively utilize temperature gradient to transfer heat, so that the heat can be more uniformly transferred to each flash evaporation unit, and the heat transfer effect is enhanced.

Compositions and methods for the removal and prevention of scale in pulp mills in a continuous and real-time process. More particularly the composition includes one or more chelating ligands, one or more copolymers, and one or more surfactants. The scale removing composition is added to the black liquor stream in pulp and paper processes to remove scaling, such as scaling from calcium carbonate, from surfaces in contact with the black liquor stream, such as in digestors and evaporators.

The invention discloses a lignin-styrene-butadiene latex core-shell material, a preparation method thereof and application of the lignin-styrene-butadiene latex core-shell material in a PE composite material, and the preparation method comprises the following steps: dissolving lignin in an organic solvent to obtain a lignin solution; the preparation method comprises the following steps: adding an emulsifier and distilled water into a reaction kettle, stirring, dropwise adding a lignin solution to form a stable oil-in-water emulsion, dropwise adding an initiator, styrene and butadiene into the oil-in-water emulsion, carrying out a thermal insulation reaction, and carrying out suction filtration, washing and drying to obtain the lignin-styrene-butadiene latex core-shell material. In addition, the core-shell material, PE, a plasticizer, a lubricant, an anti-blocking agent and the like are subjected to blending, extrusion granulation and film blowing forming, and the PE composite material is prepared. The core-shell structure effectively shields polar functional groups on the surface of the lignin, and obviously improves the compatibility and dispersity of the lignin in a PE matrix, so that the mechanical property of the composite film is enhanced, the surface defects are obviously reduced, and the high-valued resource utilization of the lignin in the papermaking black liquid is realized.

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.

The application relates to the technical field of ion batteries, and discloses a nitrogen-doped carbon material and a preparation method and application thereof, wherein the preparation method of the nitrogen-doped carbon material comprises the following steps: (1) adding an acidic solution into papermaking black liquor to obtain alkali lignin; (2) dissolving the alkali lignin in a mixed solution of ammonia water and an organic solvent to obtain an alkali lignin solution; (3) carrying out hydrothermal reaction on the alkali lignin solution to obtain a pre-nitrogenation product; and (4) mixing the pre-nitrogenation product with calcium chloride, drying and pyrolyzing to obtain the nitrogen-doped carbon material; the pyrolysis temperature is 400-800 DEG C, and the pyrolysis time is 3-5 h. The nitrogen-doped carbon material is prepared by taking papermaking black liquor as a biomass raw material, efficient utilization of waste is realized, nitrogen elements in the nitrogen-doped carbon material are uniformly distributed in a carbon skeleton, the nitrogen content and the specific surface area of the nitrogen-doped carbon material can be accurately controlled through a pyrolysis process, and the adsorption and storage behaviors of the nitrogen-doped carbon material for potassium can be quantitatively controlled.

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.

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.

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 invention discloses a spatial reticular silicon paste type defoaming agent as well as a preparation method and application thereof. The preparation method comprises the following steps: putting fluorine-containing ethynyl MQ silicon resin, hydrogen-containing silicone oil, hydroxyl silicone oil, hydrophobic SiO2 and dimethyl silicone oil into a reaction kettle, carrying out nitrogen protection, stirring and heating to 65-90 DEG C, adding chloroplatinic acid, carrying out an addition reaction for 0.5-2 hours, then adding a base catalyst, continuing to heat to 120-140 DEG C, carrying out a condensation polymerization reaction for 2-4 hours, cooling and discharging to obtain spatial reticular silicon paste; mixing the spatial reticular silicon paste, the polyether modified silicone oil, polyether and the emulsifier, stirring and heating to 55-65 DEG C, adding deionized water for phase inversion emulsification, cooling, adding deionized water, and adding the thickener to obtain the spatial reticular silicon paste type defoaming agent. Compared with the traditional silicon paste type defoaming agent in papermaking pulping, especially chemical pulping, the defoaming agent prepared by the invention has the characteristics of high black liquor defoaming speed, good foam inhibition property, good pulp washing water filtration property, no toxicity, no harm and simple preparation process.

The invention discloses a method for preparing high-quality light calcium carbonate based on green liquid separation and impurity removal-crystal nucleus induction causticization granulation, and relates to the technical field of pulping and papermaking waste liquid treatment. According to the method, pulping black liquor is used as a raw material, calcium silicate is separated through fractional precipitation, granular calcium carbonate crystals are generated through crystal nucleus induction causticization reaction, and high-quality light calcium carbonate is prepared through multi-stage purification. The content of calcium carbonate prepared by the method can reach 98-99.5% of the purity of industrial calcium carbonate, the purity of calcium silicate byproducts is greater than or equal to 90%, the calcium silicate byproducts can be directly used for roadbed materials or cement retarders, the recovery rate of sodium hydroxide in the black liquor is greater than or equal to 92%, and resource utilization is realized.

The invention relates to the technical field of papermaking wastewater treatment, and particularly discloses an analysis and characterization method for normalizing alkali lignin in papermaking black liquid and an optimal operation condition. The method comprises the following steps: selecting an ion exchange membrane electrolytic cell to electrolyze the papermaking black liquor; current, voltage, pH value, conductivity and temperature parameters in the electrolysis process are monitored in real time; sampling black liquor and bath liquor at the beginning, in the process and after the end; by drawing I-t, U-t, pH-t, kappa-t and T-t diagrams and combining ICP atomic emission spectrum analysis, sodium ion and potassium ion migration amount and alkali recovery amount are analyzed, and data are processed; meanwhile, the regularity degree of the raw materials is evaluated based on the product performance of the final black liquor in composite material preparation. According to the method, a standard data curve is established and is used for judging an electrolysis end point, and the optimal operation conditions are determined as follows: electrolysis at constant voltage of 20-25V, solid content of black liquor of 0.4, current of 1.5-4.0 A at the end of electrolysis, pH of an anode region of 7-8 and conductivity of greater than or equal to 3.0 mS / m. The method is simple and efficient, can accurately optimize the papermaking black liquid treatment process, realizes high recovery rate of lignin and alkali, reduces energy consumption and cost, and is suitable for industrial application.

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.

To provide an information processing system or the like capable of properly estimating an event which may occur in a pulp manufacturing system.SOLUTION: A first step of cooking wood chips with white liquor, a second step of obtaining green liquor from black liquor produced in the first step, a third step of obtaining clarified green liquor from the green liquor, and a step of adding calcium oxide to the clarified green liquor to obtain white liquor and calcium carbonate; A fourth step of supplying white liquor to the first step and supplying calcium carbonate to the fifth step, and the fifth step of supplying calcium oxide obtained by calcination of calcium carbonate to the fourth step are combined, the parameter information acquisition unit acquires two or more parameters related to any of the first step to the fifth step as the parameter information, the relationship model information acquisition unit acquires relationship model information created in advance and indicating a relationship between an event or an index related to the event and two or more parameters, and the estimation unit estimates the event or the index related to the event based on the acquired parameter information and the relationship model information.SELECTED DRAWING: Figure 1

The present application provides a kind of black liquor seed crystal concentration evaporator, including outer flow pipe type falling film concentration evaporator unit, black liquor seed crystal mixing and steam separator.Outer flow pipe type falling film concentration evaporator unit includes medium-pressure steam inlet box, black liquor liquid inlet flow guide film forming box, black liquor outer flow falling film evaporation box and condensate and non-condensable gas discharge box.Outer flow pipe type falling film concentration evaporator unit is connected with black liquor seed crystal mixing and steam separator by concentration black liquor discharge pipe.Black liquor seed crystal mixing and steam separator.Due to the modular design of outer flow pipe type falling film concentration evaporator unit, different black liquor processing capacity can be connected with black liquor seed crystal mixing and steam separator by pipeline through multiple units to realize.

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.

A method for improving a separation of tall oil soap from black liquor in a tall oil soap separation phase, which comprises adding of a polymer additive comprising cationic epichlorohydrin-dimethylamine based polymer into black liquor. The cationic epichlorohydrin-dimethylamine based polymer has a weight average molecular weight in the range of 1 500 – 500 000 g / mol. The cationic epichlorohydrin- dimethylamine based polymer may be further crosslinked with ethylenediamine (EDA). The polymer additive can be added to black liquor from pulping process prior to tall oil soap separation, and / or to a tall oil soap solution, which is achieved from separating tall oil soap from black liquor.

The invention discloses a comprehensive utilization method of bamboos, and belongs to the technical field of comprehensive utilization of bamboo products. According to the silicon content difference of different parts of the bamboos, the raw bamboos are separated into the bamboo green layers and the bamboo flesh for graded utilization, the bamboo green layers are used for producing high-added-value products, the bamboo flesh is used for pulping and papermaking, and efficient comprehensive utilization of the low-carbon high-silicon bamboos is achieved. Graded utilization is achieved based on natural differences of silicon contents of all parts of bamboo wood, the silicon content of a bamboo green layer is far higher than that of bamboo pulp, the bamboo green layer is rich in active ingredients, 62% or above of silicon in pulping bamboo chips can be removed from the source after stripping, the silicon content of pulping black liquor is reduced by 53% or above, and the pulping quality is improved. The core problems of equipment scaling, alkali recovery rate reduction and the like caused by silicon in the papermaking process are thoroughly solved, meanwhile, high-added-value products such as bamboo-based composite materials and functional drinks can be specifically prepared through the bamboo green layer, and bamboo meat meets the pulping and papermaking requirements due to rich fibers and low silicon content; and finally, high-value comprehensive utilization with low carbon, environmental protection and high economic benefit of the bamboo wood is achieved.

This invention discloses an defoamer, its preparation method, and its application. By weight, it comprises the following components: 100-110 parts silicone paste; 5-8 parts polyether-modified silicone oil; 10-20 parts surfactant; 2-4 parts dispersing agent; and 200-250 parts distilled water. Based on the weight of the silicone paste, the silicone paste is prepared from raw materials comprising the following components: 100 parts organosiloxane; 6-8 parts active particles; and 1-1.5 parts silane coupling agent. The anionic surfactant of this invention helps to improve the defoaming speed of the defoamer, while simultaneously increasing the cloud point of the nonionic surfactant and improving its high-temperature resistance to prevent demulsification and failure. The nonionic surfactant assists in the fusion of the components in the defoamer, making it less prone to stratification and improving the defoamer's performance. Specifically, this invention involves adding the defoamer to the extraction and rinsing stages of black liquor during the pulping process in paper mills to achieve defoaming treatment of the black liquor.

The utility model relates to a black liquor spray gun for a large alkali recovery boiler, and belongs to the technical field of combustion devices of alkali recovery boilers. One end of the special-shaped connector is communicated with the side wall of the spray gun nozzle, and the other end of the special-shaped connector is communicated with the flow guide pipe; the upper end of the spray gun nozzle is sealed, the lower end of the spray gun nozzle is provided with a black liquor nozzle, and the top of the spray gun nozzle is flush with the special-shaped connector and arranged in an offset mode for guiding black liquor to tangentially flow into the spray gun nozzle. The connecting structure of the conventional black liquor spray gun is changed, the cyclone effect of the black liquor is improved, the flowing dead angle of the black liquor is avoided, and the black liquor is sprayed more uniformly.

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 invention discloses a production method and application of bamboo reed dissolving pulp. The production method of the dissolving pulp comprises the following steps: preparing materials, slicing bamboo reeds, tearing and softening, removing dust, cleaning and dehydrating; keeping the temperature at 150-175 DEG C for 90-150 minutes, and carrying out steam hydrolysis; a sulfite solution is adopted, cooking is conducted for 90-150 min at the temperature of 160-180 DEG C till the pH end point ranges from 5.5 to 6.5, and the hardness K of feed liquid ranges from 15 to 21; and then carrying out a coarse pulp washing and screening process, an oxygen delignification process and an A-DO-EOP-D1-D2 bleaching process so as to carry out multi-stage bleaching on the pulp. The bamboo reed is used as a raw material instead of wood, so that the wood is saved, the cost is reduced, the black liquor in the preparation process can be used as fulvic acid fertilizer, secondary solid waste pollution is avoided, and the method is environment-friendly and efficient in utilization. The dissolving pulp prepared by the method meets the standard and has antibacterial property when being applied to fiber materials.

The invention discloses a method for extracting lignin from sulfate pulping black liquor, which comprises the following steps: heating the black liquor to 50-70 DEG C in the stirring process, then adjusting the pH value of the black liquor to 3.0-4.5 by using organic acid, stopping adding acid, and aging under the conditions of stirring and 50-70 DEG C to obtain aged pulp; centrifuging the aged slurry, discarding the supernatant, collecting the precipitate, then washing the precipitate with acidic water, repeating the steps of centrifuging and washing for several times, and collecting the precipitate to obtain a crude lignin filter cake; and treating the obtained crude lignin filter cake in a phosphoric acid solution, washing the obtained product until the pH value of the filtrate is neutral, and then drying to constant weight to obtain the phosphorylated lignin. According to the invention, low vulcanization, high purity and functionalization (high thermal stability) of the product can be realized at the same time, so that the application barrier of the existing lignin is broken, and the huge potential of the lignin as a renewable resource is released.

The invention relates to the technical field of fiber preparation, in particular to a method for preparing bamboo fibers and recycling black liquor. The method comprises the steps that bamboo chips are placed in alkali liquor to be subjected to digestion, first solid-liquid separation is conducted, and bamboo fibers and black liquor are obtained; carrying out adsorption decoloration on the black liquor to obtain a decoloration solution; carrying out acidification on the decolored solution to separate out lignin, and carrying out second solid-liquid separation to obtain lignin and acidification wastewater; carrying out Fenton oxidation on the acid precipitation wastewater, and carrying out ion exchange desalination on the effluent to obtain purified water; and mixing the purified water with flushing wastewater, and recycling the obtained mixed water to the digestion process. The method not only solves the problem of environmental pollution of the traditional method, but also converts the by-product lignin into a marketable product, and is low in energy consumption.

Methods of dewatering viscous materials are provided. The method comprises contacting the viscous material with pressurized carbon dioxide at a temperature and for a time wherein at least a fraction of water is expressed from the viscous material. Then the pressure is released, and the water expressed from the viscous material is removed to yield a dewatered product. Exemplary viscous materials that can be dewatered by the method include black liquor from wood pulping operations, wet lignin, wet super water absorbent polymers and sugar solutions. The pressurized carbon dioxide is present in subcritical or supercritical form. The method provides dewatering at reduced cost.