60 results about "Kraft lignin" patented technology

The invention provides a material for removing sodium ions in saline-alkali soil and a preparation method, and relates to the field of sodium ion adsorbents, the preparation method comprises the following steps: (1) lignin modification: under a water bath condition, dissolving sulfate lignin in a mixed solution of analytically pure acetic acid and 30% hydrogen peroxide, then adding ferric chloride, reacting for 1.5-2.5 hours, diluting with distilled water by 7-8 times, centrifuging and washing to obtain modified lignin; drying to obtain oxidized lignin; (2) hydrogel synthesis: mixing and stirring the oxidized lignin and analytically pure acrylic acid, adding a cross-linking agent and an initiator, and reacting in a drying oven at 65-75 DEG C for 1.5-2.5 hours to form a sodium ion adsorption material with a porous interpenetrating network structure; by modifying the lignin, particularly introducing more hydroxyl and carboxyl groups, the performance of the lignin in the application of adsorbing ions, preparing hydrogel and the like can be improved.

The invention discloses a bonding method for low-glue-consumption high-strength plywood based on a lignin formaldehyde-free adhesive, and belongs to the technical field of adhesives. The lignin-based formaldehyde-free adhesive is adopted to adhere the veneers, the single-face adhesive applying amount does not exceed 80 g / m < 2 >, and after hot-pressing curing, the bonding strength of the prepared high-strength plywood is not lower than 0.7 MPa; the lignin-based formaldehyde-free adhesive is prepared by separating and treating a wood fiber raw material or sulfate lignin with a mixed solution. After the adhesive disclosed by the invention is used for bonding three layers of poplar veneers, the dry strength can reach 0.9-1.3 MPa, and the class II wet strength can reach 0.8-1.0 MPa; the elasticity modulus and the static bending intensity of the plywood are obviously higher than 5500 MPa and 32 MPa after the plywood is bonded with five layers of plywood; the plywood manufactured by the method disclosed by the invention is far better than industrial urea-formaldehyde resin adhesive bonded plywood, and the bonding strength of the plywood is equivalent to that of industrial phenolic aldehyde bonded plywood.

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

The present invention discloses a bonding method for a high-strength plywood with a low sizing amount based on a lignin formaldehyde-free adhesive, belonging to the technical field of adhesives. In the present invention, a lignin-based formaldehyde-free adhesive is used to bond veneers, and the single-sided sizing amount is not more than 80 g / m<supgt;2< / supgt>. After hot pressing and curing, the bonding strength of the obtained high-strength plywood is not less than 0.7 MPa; the lignin-based formaldehyde-free adhesive is prepared by separating and treating lignocellulosic raw materials or kraft lignin with a mixed solution. The adhesive of the present invention can reach a dry strength of 0.9 - 1.3 MPa and a class II wet strength of 0.8 - 1.0 MPa after bonding three-layer poplar veneers; the elastic modulus and static bending strength after bonding five-layer plywood are significantly higher than 5500 MPa and 32 MPa; the plywood manufactured by the method of the present invention far exceeds the plywood bonded with industrial urea-formaldehyde resin glue, and the bonding strength is equivalent to that of industrial-grade phenolic-bonded plywood.

[Problem] To provide a thermosensitive recording medium having an excellent corrosion resistance of a thermal head when printing, as well as good for the environment using kraft lignin as a color developing agent. [Means to solve the Problem] A thermosensitive recording medium, comprising: a thermosensitive recording layer containing a colorless or pale colored electron donating leuco dye and an electron accepting color developing agent on a substrate, wherein the thermosensitive recording layer contains a kraft lignin as the electron accepting color developing agent, and the kraft lignin contains almost no hydrogen sulfide or contains only 400 ppm at most.

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.

To provide a compatibilizer for bioasphalt compositions that is capable of enhancing the compatibility between a lignin component and asphalt in the bioasphalt compositions.SOLUTION: The present invention provides a compatibilizer for a bioasphalt composition, comprising a lignin derivative compound that includes: structural unit (I): a structural unit derived from a lignin-based compound, and structural unit (II): a structural unit derived from an aromatic water-soluble compound including at least an aromatic water-soluble compound having an alkylene oxide chain, and a bioasphalt composition comprising asphalt, a lignin component such as kraft lignin, and the compatibilizer.SELECTED DRAWING: None

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.

The APPARATUSES, METHODS AND SYSTEMS FOR APPARATUSES, METHODS AND SYSTEMS FOR YIELD INCREASE IN A KRAFT COOKING PLANT present synergies for at least two parallel cooking plants, e.g., one producing dissolving pulp in a prehydrolysis kraft process, and the other producing kraft pulp by kraft pulping process, which may facilitate increased cooking yield in the kraft cooking plant producing kraft pulp by recovering the hemicelluloses solubilized in the acidic hydrolysate of the prehydrolysis kraft process. In some implementations, there may be no cold caustic extraction step on the dissolving pulp line as the target pulp purity can be achieved by performing just a prehydrolysis step, with reutilization of an acidic hydrolysate stream in a kraft pulp line.

A wax-extender emulsion is described herein. In one aspect, the wax-extender emulsion includes a wax component. The wax component may be a petroleum-based wax, a bio-based wax, a synthetic wax or mixtures thereof. The wax-extender emulsion includes a dewatered, kraft lignin associated with the wax component and a pH modifier. The pH modifier a monofunctional amine, a multi-functional amine, an alkali metal salt, an alkaline earth metal salt, or combinations thereof. In one aspect, the emulsion comprises 20 wt % to 60 wt % wax component. During manufacturing, the dewatered, kraft lignin and the wax component may be emulsified and homogenized together to produce the wax-extender emulsion. The wax-extender emulsion can be co-applied as a mixture with adhesive resin during wood-based composite manufacturing.

Apparatus, methods, and systems for increasing the yield of kraft cooking facilities provide a synergistic effect for at least two parallel cooking facilities, for example, one cooking facility produces dissolving pulp in a prehydrolysis kraft process, the other cooking facility produces kraft slurry through a kraft pulping process, and the other cooking facility produces kraft pulp through a kraft pulping process. By recovering hemicellulose dissolved in an acidic hydrolysate of a sulfate prehydrolysis process, the cooking yield of a sulfate cooking facility for producing sulfate slurry can be increased. In some embodiments, there may be no cold alkali extraction step on the dissolving pulp production line because the target pulp purity can be achieved only by performing the pre-hydrolysis step and the acidic hydrolysate stream is reused on the sulfate pulp production line.

It is provided a process of preparing self-polymerized kraft lignin comprising the steps of thermally treating kraft lignin producing self-polymerized lignin; and isolating the self-polymerized lignin. Also provided is the use of self-polymerized kraft lignin as an adhesive for wood panels.

According to an example aspect of the present invention, there is provided a method of replacing with sodium make-up chemicals sodium losses caused by outflows in a pulp mill which employs a kraft process for producing cellulosic pulp, wherein the pulp mill includes a unit for conversion of sulphurous compounds, which is fed with sulphurous substances of the kraft process to convert said sulphurous substances into oxidized sulphurous compounds, said method comprising using sodium sulphate possibly together with other sodium salts as the main make-up chemical, to achieve an essentially sodium hydroxide free feed of sodium make-up chemicals, and at least a part of the sulphur contained in the sodium sulphate make-up chemical being used for producing oxidized sulphurous compounds in said unit for conversion of sulphurous compounds.

A wax-extender emulsion is described herein. In one aspect, the wax-extender emulsion includes a wax component. The wax component may be a petroleum-based wax, a bio-based wax, a synthetic wax or mixtures thereof. The wax-extender emulsion includes a dewatered, kraft lignin associated with the wax component and a pH modifier. The pH modifier a monofunctional amine, a multi-functional amine, an alkali metal salt, an alkaline earth metal salt, or combinations thereof. In one aspect, the emulsion comprises 20 wt % to 60 wt % wax component. During manufacturing, the dewatered, kraft lignin and the wax component may be emulsified and homogenized together to produce the wax-extender emulsion. The wax-extender emulsion can be co-applied as a mixture with adhesive resin during wood-based composite manufacturing.

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 subject of the application is a method for obtaining lignin-POM-COF or lignosulfonate-POM-COF nanofibers using the electrospinning technique, in which poly(vinyl alcohol) and kraft lignin or calcium or magnesium lignosulfonate are dissolved in a deep eutectic mixture consisting of urea and lactic acid in a molar ratio of 1:2, obtaining solutions with a 1% concentration of poly(vinyl alcohol) and a 2.5% concentration of lignin or calcium or magnesium lignosulfonate, after which a polyoxometalate hybrid with a covalent organic structure (POM-COF) in the range of 40 - 150 mg, preferably 100 mg, is added to 10 ml of such a solution, and then the electrospinning process is carried out under specific process conditions.

The present invention relates to the chemical industry and preferably to the industry relating to novel products derived from or based on lignin, and even more preferably to products derived from or based on modified lignin, phenolic adhesive resins comprising same and use thereof as adhesive for plywood panels, particle boards, chipboards and pine veneers, inter alia. The starting lignin is Kraft lignin.

Three-layer panel of hemp hurd (awn) (particles and short fibres), formed into two face layers and interposed between them an intermediate layer containing hemp particles and short fibers from hemp stems, and comprising a dispersed phase and a matrix phase, wherein the dispersed phase comprises hemp particles (70-95 % by weight of the total dispersed phase) and short fibers from hemp stems (5-30 % by weight of the total dispersion phase), and the matrix phase comprises as binders an adhesive phase comprising one or more of urea formaldehyde resin, with a molar ratio in the range 1,0 to 1,2; melamine formaldehyde resin, with molar ratio 1,1 to 1,6; lignosulfonate (sulfite lignin) or polymethylene diphenyl diisocyanate; and one or more enhancers selected from the group of ammonium hydrogen sulfite, paraffin, and amino polyphosphate. The invention also relates to a method for the production of the panel according to the description which includes pre-pressing (cold pressing) of the carpet and hot pressing. The invention provides an ecological panel of hemp, with which a reduction in the consumption (respectively felling) of wood raw material is achieved due to the use of residual agricultural lignocellulosic material - hemp stems. In addition, the invention ensures the use of a secondary product from the production of the pulp and paper industry - lignosulfonate (sulfite lignin).

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 process for producing a lignin composition, which process comprises:providing a lignin slurry comprising water and a water miscible organic solvent;subjecting the lignin slurry to extraction at an extraction temperature of less than 100° C. for an extraction time of at least 1 minute to provide an extracted slurry;removing liquid from the extracted slurry to provide an extracted lignin; andsuspending the extracted lignin in a polar organic solvent to provide a lignin composition having a dry matter content of at least 30% by weight.The present invention also relates to a lignin composition comprising hardwood Kraft lignin and a polar organic solvent, which composition has a dry matter content of at least 30% by weight. The present invention also relates to use of the lignin composition as a fuel.

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.

To provide a skin patch sheet in which the capability to absorb ultraviolet rays is readily maintained at positions to which ultraviolet absorbing capability has been imparted by the user, and the sheet body is prevented from appearing to lift off from the skin, and a method for producing the skin patch sheet.SOLUTION: A skin patch sheet 10 comprises: a substrate layer 11 containing an aqueous polymer compound and at least one of lignin sulfonate and kraft lignin; and an adhesive layer 12 laminated on the substrate layer 11. The adhesive layer 12 is located on the side opposite to the surface facing the substrate layer 11 and includes an adhesive surface 12S for skin attachment. In a sheet body 10B including the substrate layer 11 and the adhesive layer 12, the transmittance throughout the full range of 280 nm to 400 nm is 80% or less.SELECTED DRAWING: Figure 1

A roofing bitumen composition includes a paving grade bitumen feedstock, a low MW polyolefin, and 9-60% of a material selected from the group of kraft lignin, recycled fibrous material, recovered bitumen from recycled asphalt shingles (RAS), reclaimed asphalt pavement (RAP), recycled tire rubber (RTR), and combinations thereof. This roofing bitumen composition has a calculated reduction in scope 3 carbon footprint between about 5% and 60%.