27 results about "Kraft lignin" patented technology

To provide alternative thermoplastic expandable microspheres whose thermoplastic polymeric shell is at least partially derived from a sustainable source, a method for preparing the microspheres, and use of the microspheres.SOLUTION: There are provided thermally expandable microspheres comprising a polymeric shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the polymeric shell comprises isolated lignin. The isolated lignin preferably comprises Kraft lignin such as acetylated Kraft lignin. A method for preparing thermally expandable microspheres comprising a polymeric shell surrounding a hollow core comprises the steps of (i) preparing a mixture comprising the isolated lignin and the blowing agent in a solvent, and (ii) spray-drying the mixture obtained in step (i) to obtain thermally expandable microspheres.SELECTED DRAWING: Figure 1

A digester additive formulation includes a combination of phenyl tetracarboxylic acid or a derivative or salt thereof, and a macromolecule polymer. The digester additive formulation is as an additive for a kraft process for production of pulp from raw materials, such as wood chips. When used in the kraft pulping process, the digester additive formulation improves viscosity of the resulting pulp and increases pulp yield.

The present invention provides a material and a preparation method for removing sodium ions from saline-alkali land, which relates to the field of sodium ion adsorbents and comprises the following steps: (1) modifying lignin: dissolving sulfate lignin in a mixed solution of analytically pure acetic acid and 30% hydrogen peroxide under water bath conditions, adding ferric chloride, reacting for 1.5-2.5 hours, diluting 7-8 times with distilled water, centrifuging, washing, and drying to obtain oxidized lignin; (2) synthesizing hydrogel: mixing oxidized lignin with analytically pure acrylic acid, adding a crosslinking agent and an initiator, and reacting in an oven at 65-75°C for 1.5-2.5 hours to form a sodium ion adsorption material with a porous interpenetrating network structure; the present invention can improve the performance of lignin in applications such as adsorbing ions and preparing hydrogels by modifying lignin, especially introducing more hydroxyl and carboxyl groups.

The roofing bitumen composition comprises 9 to 60 percent of a material selected from the group consisting of paving-grade bitumen feedstock, low-MW polyolefins, and kraft lignin, recycled fibrous materials, bitumen recovered from recycled asphalt shingles (RAS), recycled asphalt pavement (RAP), recycled tire rubber (RTR), and combinations thereof. This roofing bitumen composition has a calculated scope 3 carbon footprint reduction of about 5% to 60%.

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.

The invention provides an ultrathin self-supporting composite solid electrolyte membrane, a preparation method thereof and a solid-state battery, and relates to the field of solid-state batteries. The method comprises the following steps: under an alkaline condition, mixing sulfate lignin, formaldehyde and water, and carrying out hydroxymethyl reaction to obtain a product after hydroxymethyl reaction; mixing the hydroxymethyl reaction product with a sulfonating agent, and carrying out sulfonation reaction to obtain sulfonated lignin; the preparation method comprises the following steps: mixing sulfonated lignin, a conductive ionic polymer, a lithium salt, a fast ionic conductor and a first solvent to obtain a spinning precursor liquid, and carrying out electrostatic spinning on the spinning precursor liquid to obtain a high-ionic-conductivity cellulose-based support membrane; and mixing the sulfide solid electrolyte, the glue solution and a second solvent to obtain sulfide slurry, mixing the sulfide slurry and the high-ion-conductivity cellulose-based supporting membrane, and carrying out vacuum impregnation-drying and rolling to obtain the ultrathin self-supporting sulfide electrolyte membrane. The method is simple to operate and easily available in raw materials.

An aqueous wax emulsion or dispersion comprising, wax, water and an emulsifier wherein the emulsifier comprises purified kraft lignin and a water-soluble base. A process for preparing said aqueous wax dispersions and their use.

The present invention relates to a method for reducing metal content in a kraft pulping process, which includes adding magnesium to black liquor that is returned to the pulping operation; a method for reducing aluminum content in a pulping process by adding magnesium to black liquor to provide green liquor with a specific magnesium:aluminum molar ratio; a method for producing or treating green liquor with a specific magnesium:aluminum molar ratio by adding magnesium to black liquor, weak black liquor, or strong black liquor; and a method for producing hydrotalcite by adding at least 0.04 to 5.0 moles of magnesium:aluminum present in weak black liquor, strong black liquor, or a combination thereof. A pulp mill is also provided, which includes, among other parts, a digester (1), a washer (2), optionally a pulp bleacher, and a weak black liquor thickener (4).

The invention relates to a preparation method of a lignin nanoparticle / polyester composite packaging film, and belongs to the field of lignin high-valued application. The industrial sulfate lignin is subjected to molecular weight grading through a green organic solvent, LNPs is prepared by combining an anti-solvent precipitation technology, and the LNPs is doped into PBAT to prepare the LNPs / PBAT composite packaging film. The obtained composite film is remarkably superior to a sample doped with original lignin in the aspects of mechanical property, ultraviolet barrier property, oxidation resistance and antibacterial property, and the method is green in process, high in controllability and suitable for large-scale application and has good lignin high-value utilization and packaging material development prospects.

The invention relates to the field of oil and gas exploitation, in particular to a corrosion inhibitor for carbon dioxide corrosion and a preparation method thereof. The corrosion inhibitor for carbon dioxide corrosion comprises the following components: foots, sodium hydroxide, a paper pulp by-product, sulfuric acid, m-phenylenediamine, rosin amine, diethylenetriamine and EDTMP, and the paper pulp by-product is a by-product obtained by using wood as a raw material and preparing paper pulp through a sulfate method. The corrosion inhibitor for carbon dioxide corrosion not only is low in cost, but also is low in corrosion rate.

A digester additive formulation includes a combination of phenyl tetracarboxylic acid or a derivative or salt thereof, and a macromolecule polymer. The digester additive formulation is as an additive for a kraft process for production of pulp from raw materials, such as wood chips. When used in the kraft pulping process, the digester additive formulation improves viscosity of the resulting pulp and increases pulp yield.

The present invention relates to a polymer matrix modifying composition having anti-corrosion, biocidal and mechanical property enhancing properties, comprising between 50 and 99% of an organic component consisting of lignin selected from the group consisting of organic solvent lignin, kraft lignin, soda lignin and / or derivatives thereof; between 1 and 40% of a divalent or trivalent inorganic cation; and between 0 and 10% of a formulation aid. The invention also relates to a method for the production and use thereof for providing properties of corrosion protection, biocidal and / or enhanced mechanical properties of a polymer matrix when the composition is homogeneously mixed with the polymer matrix in a final proportion of 0.1 to 5% w / w with respect to the polymer matrix prior to curing.

The invention discloses a covalent modification method of a high-performance lignin-based electrode material, and belongs to the technical field of biomass-based supercapacitors. The method specifically comprises the following steps: dissolving sulfate lignin in DMF (Dimethyl Formamide), adding a bifunctional reagent, and stirring for reaction; and after the reaction is finished, pouring the reaction liquid into deionized water in which hydrochloric acid is dropwise added, and carrying out anti-precipitation, filtration, drying, heat treatment, activation and other processes to obtain the covalent modified lignin. The modified lignin, a conductive agent and a binder are ground and mixed, a current collector is coated with the mixture and dried, and the lignin-based electrode is obtained. The covalent modification degree of the lignin is regulated and controlled by controlling the adding amount of the bifunctional reagent, modified lignin with different thermodynamic properties is obtained, and the purpose of regulating and controlling lignin derived carbon structure defects is achieved. The preparation method is controllable in scale and simple to operate, the obtained electrode material is few in defect structure and excellent in electrochemical performance, and a new theory and a new method are provided for development of the lignin-based electrode material.

Bio-based polymer precursors and non-isocyanate polyurethanes (NIPU) and non-isocyanate polyurethane foams (NIPUF) that can be formed from the precursors, and methods of synthesizing the precursors and polyurethane products, are described. The bio-based polymer precursors are formed by functionalizing a bio-based polyol, such as lignin, with a cyclic carbonate. The bio-based polyol starting material does not require pre-processing, and can include kraft lignin. The NIPU / NIPUF can be synthesized by a ring-opening curing reaction of the cyclic carbonate of the bio-based polyol precursor with a diamine. The carbonate and diamine can constitute a non-toxic, bio-based carbonate.

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.

The invention relates to a high-temperature resistant and flame-retardant ultra-high molecular weight polyethylene composite yarn and a preparation method thereof. The composite yarn of the invention adopts a special high-temperature resistant and spinning process, and is subjected to a composite treatment of sodium alginate, alkali sulfate lignin, ammonium polyphosphate, graphene oxide, magnesium hydroxide, low-temperature plasma, aluminum foil, and carbon fiber impregnation adhesive, and is externally coated with ceramic fibers. The ultra-high molecular weight polyethylene fibers can maintain performance stability in a high-temperature environment, effectively prevent the fibers from melting or thawing, do not melt when exposed to fire, produce low or no smoke, and do not release toxic gases, thereby improving safety in use.

The present invention relates to the field of carbon-based catalysts and electrocatalysis technology, and specifically to the preparation and application of a lignin-derived oxygen reduction / oxygen evolution bifunctional electrocatalyst material. The present invention solves the problems of high cost, poor stability, and single function of catalysts formed by conventional technologies. The present invention comprises an oxygen reduction / oxygen evolution bifunctional electrocatalyst material, which is composed of sulfate lignin powder, sodium chloride, urea, and nitrate solution, wherein the mass ratio of sulfate lignin powder, sodium chloride, urea, and nitrate solution is 1:5:5:100. The present invention uses sulfate lignin as a carbon substrate, NaCl for pore formation, urea as a nitrogen source, and iron nitrate nonahydrate and nickel nitrate hexahydrate as Fe and Ni sources, respectively, to prepare a lignin-derived carbon-based bifunctional oxygen electrocatalyst that is co-doped with S and N and loaded with Fe and Ni bimetallics.

A useful digester aid for a Kraft pulping process is an aromatic polycarboxylic acid that: (a) contains an aromatic moiety having on average at least 2 carboxylic acid groups per molecule pendant from the aromatic moiety; and (b) has an electron affinity below -2.80eV and at least -3.6eV. or is a functional equivalent of the aromatic polycarboxylic acid.

This invention discloses a bio-based composite reinforcing agent, comprising, by weight, the following raw materials: 4-8 parts of silica, 1-4 parts of lignin, and 1-4 parts of modified glass fiber powder. The lignin is any one or a combination of enzymatically hydrolyzed lignin, alkali lignin, lignin sulfate, lignin sulfonate, and etherified lignin. The silica is any one or a combination of JS180, JS185, 2115MP, 1165MP, V15, and V43. The modified glass fiber powder is obtained by modifying glass fiber powder with dopamine. This invention also discloses a method for preparing this bio-based composite reinforcing agent and its application in shoe sole materials. The prepared bio-based composite reinforcing agent has a good reinforcing effect on the rubber matrix and can improve the overall performance of the shoe sole.

The present invention discloses a kraft lignin-heptazine conjugated polymer, a preparation method thereof, and an application thereof. The structure of the kraft lignin-heptazine conjugated polymer comprises kraft lignin and a heptazine ring. The kraft lignin-heptazine conjugated polymer of the present invention is prepared by copolymerizing kraft lignin and a carbon-nitrogen polymer in an alkali metal salt. The copolymerization of the kraft lignin of the present invention effectively reduces the band gap of the heptazine-based polymer, extends its light absorption response range to the long-wavelength visible light region, and improves the separation efficiency of photogenerated carriers; the kraft lignin-heptazine conjugated polymer has significant advantages in the photocatalytic reduction of hydrogen peroxide and is reusable; kraft lignin is the main component of papermaking black liquor, has abundant sources, and is low in acquisition cost. The present invention provides a new direction for the high-value utilization of kraft lignin; the present invention also simplifies the preparation of hydrogen peroxide, which can be carried out under normal pressure air, and no additional oxygen is required during the preparation process.

Compositions comprising Kraft lignin and a wax are provided for use as an additive for imparting water resistance to gypsum wallboards. The compositions comprise emulsions of the lignin and wax components or an aqueous dispersion of the wax in a lignin solution. Methods of preparing and using such compositions are also provided.

The application discloses preparation of hydroxypropyl sulfonated kraft lignin and application of the hydroxypropyl sulfonated kraft lignin as a calcium-containing gangue mineral inhibitor. The hydroxypropyl sulfonated kraft lignin is applied to flotation separation of scheelite and fluorite and calcite, and shows high selective inhibition to the calcium-containing gangue mineral, so that the flotation separation recovery rate of the scheelite can be improved. The hydroxypropyl sulfonated kraft lignin is easy to obtain, low in cost, biodegradable, less in environmental pollution, and favorable for popularization and use.

The application discloses a preparation method of a low-carbohydrate hydration temperature inhibitor, and relates to the technical field of concrete admixtures; the preparation method comprises the following steps: (1) dissolving Kraft lignin in tetrahydrofuran, then adding an alkali catalyst at room temperature, then adding a phosphating reagent, heating to a solvent reflux state, keeping for 8 hours, cooling to room temperature, quenching by adding water, and then sequentially performing rotary evaporation and drying to obtain phosphinylated Kraft lignin; (2) dissolving the phosphinylated Kraft lignin obtained in the step (1) and paraformaldehyde in a mixed solvent, adding an alkali catalyst at room temperature, stirring, heating to 60-70 DEG C and reacting for 2-6 hours, and cooling to room temperature to obtain the low-carbohydrate hydration temperature inhibitor. The application further includes the low-carbohydrate hydration temperature inhibitor prepared by the above method. The inhibitor has a good hydration temperature rising effect, can reduce the cracking risk of concrete caused by temperature drop shrinkage, and avoids cracking.

Bio-based polymer precursors and non-isocyanate polyurethanes (NIPU) and non-isocyanate polyurethane foams (NIPUF) that can be formed from the precursors, as well as methods for the synthesis of the precursors and the polyurethane products are described. The bio-based polymer precursors are formed through functionalization of a bio-based polyol, e.g., lignin, with cyclic carbonates. The bio-based polyol starting materials need not be pre-processed and can include Kraft lignin. NIPU / NIPUF can be synthesized through a ring opening curing reaction of cyclic carbonates of the bio-based polyol precursor with diamines. The carbonates and diamines can include non-toxic bio-based carbonates.

A blended furnish with improved performance characteristics while reducing environmental impact, when applied to a substrate and methods of making and using blended furnish are provided. A blended furnish comprises a urea-formaldehyde (UF) resin or a melamine-urea-formaldehyde (MUF) resin; a lignosulfonate, a kraft lignin or a sulfonated lignin; a deep eutectic solvent; an alkaline compound; optionally an additive; and a plurality of substrates, wherein the blended furnish has a buffer capacity of 2-200 mL of 0.1 N HCl by the Acid Titration Value (ATV) Method using 20 grams of blended furnish for a period of time up to 20 days. A composite product using a blended furnish is also provided.

Provided are: a kraft lignin that blocks the absorption of an ultraviolet region; and a cosmetic, an ink, a printed matter, a coating material, an automobile coating material, a coating material, a plastic, a fiber, a film, a resist for a black matrix, a resist for an optical spacer, a cured product thereof, and the like, which contain the kraft lignin having the ability to absorb the ultraviolet region. It is found that in an infrared absorption spectrum measured by a Fourier transform infrared spectrophotometer in which an ATR unit is attached, the ability to block ultraviolet rays of kraft lignin having a specific peak is high, and in color measurement by the spectrophotometer, the L * value is high, and therefore the kraft lignin can be particularly suitable for cosmetic applications, and the above-mentioned problem can be solved.

A method for separating water and at least one lignin fraction, lignin derivatives, low-molecular carboxylic acids, sodium sulfate, or a mixture thereof from filtrates originating from a black liquor of a kraft process. Black liquor is concentrated to a solids content between 25 and 55 wt. %. A first separation step, polymer lignin with a number average of the molecular mass distribution of >6 kDa is precipitated and filtered out by lowering the pH value of the black liquor, a first filtrate is obtained which is acidified with sulfuric acid; a formed precipitate consisting of lignin is separated by means of filtration; a second acid filtrate is obtained, cooled to a temperature less than 10° C., a fraction consisting substantially of inorganic salts is crystallized out; the formed precipitate is filtered off, a third filtrate is obtained which contains low-molecular carboxylic acid-soluble lignin and groups of the inorganic salts.