432results about "Lignin derivatives" patented technology

The invention discloses a method for catalytically oxidizing lignin to depolymerize into an aviation oil intermediate by using a cellulose carbon aerogel supported copper nano-catalyst. Comprising the following steps: (1) dissolving cellulose powder into a mixed alkali solution of NaOH and urea, and stirring at low temperature to obtain a clear and transparent cellulose solution; and washing to be neutral to obtain well dispersed cellulose suspension. And (2) carrying out suction filtration molding, and freeze-drying for a period of time to obtain the cellulose aerogel. And (3) immersing in an ethanol solution of copper nitrate for ultrasonic treatment, and drying in a vacuum drying oven. And (4) carrying out high-temperature calcination in an N2 atmosphere to obtain a catalyst which is marked as Cu / CA. And (5) the catalyst can efficiently catalyze a Fenton-like reaction to oxidize a dimer model compound of lignin in acidic, neutral and alkaline environments to obtain products including benzoic acid, acetophenone, benzyl alcohol, phenol and the like, the required hydrogen peroxide concentration is low, and the catalyst has the advantages of simple process, high catalytic activity, low cost and the like, can be used for effectively degrading lignin to prepare aviation oil intermediates, and has wide application prospects. And repeated cyclic utilization is realized.

The invention relates to the technical field of asphalt concrete, and discloses an anti-crack asphalt concrete material and a preparation method thereof. According to the asphalt concrete material disclosed by the invention, by adding the reinforcing filler and the composite aerogel, the crack resistance, the service life and the ultraviolet aging resistance of a matrix are remarkably improved; wherein the reinforcing filler is based on the synergistic effect among modified lignin, diatomite and hydrotalcite, the compatibility among modified lignin, diatomite and hydrotalcite is improved by utilizing a silane coupling agent, and the dispersity of the reinforcing filler in a matrix is improved, so that the crack resistance of the matrix is improved, the service life of the matrix is prolonged, and the ultraviolet resistance of the matrix is improved; the composite aerogel has excellent heat insulation performance and a three-dimensional network structure, and the crack resistance of the matrix can be improved through the synergistic effect.

The invention provides a natural amphiphilic lignin nanoparticle emulsifier for an oil-based drilling fluid as well as a preparation method and application of the natural amphiphilic lignin nanoparticle emulsifier, and belongs to the technical field of oilfield chemical drilling fluids. The preparation method of the emulsifier comprises the following steps: fully dissolving alkali lignin in an organic solvent; filtering, dropwise adding filtrate into deionized water, fully dispersing, and dialyzing; and then carrying out ultrasonic treatment, centrifuging, washing and drying. The emulsifier takes the biomass-based polymer industrial alkali lignin as a raw material, and is green, non-toxic, cheap and easy to obtain; the preparation method is simple, short in period and free of harmful by-products, the organic solvent can be recycled, and the cost is low. The lignin nanoparticles are added into the oil-based drilling fluid as an emulsifier, so that the stability of the oil-based drilling fluid under a high-temperature condition can be remarkably improved; a compact interfacial film can be formed at an oil-water interface, and a three-dimensional network structure with viscoelasticity can be formed in a continuous phase, so that the stability of a water-in-oil emulsion is improved.

The invention belongs to the technical field of viscosity reduction in an oil reservoir development technology, and discloses a CO2-resistant lignin viscosity reducer and a preparation method and application thereof, and the CO2-resistant lignin viscosity reducer has a structure as shown in a formula (1). R is selected from H and at least one of a formula (2), R2 is alkylene of C1-C3, and R1, R3, R4 and R5 are the same or different and are respectively alkyl of C1-C18; the CO2-resistant lignin viscosity reducer can obviously reduce the viscosity of heavy oil; # imgabs0 #

The invention provides a tannic acid-like compound based on lignin microwave catalytic reforming and a preparation method thereof, and belongs to the technical field of biomass conversion and utilization, and the preparation method comprises the following steps: pretreating lignin to prepare gallic acid esterified lignin, carrying out a microwave pyrolysis reaction on the gallic acid esterified lignin and a demethylation reduction catalyst, and obtaining the tannic acid-like compound based on lignin microwave catalytic reforming. 2, microwave pyrolysis is carried out, a microwave pyrolysis product is obtained, the microwave pyrolysis product is separated to obtain a crude tannic acid compound solution and an unactivated demethylation reduction catalyst, the unactivated demethylation reduction catalyst is calcined and activated to obtain the demethylation reduction catalyst, and the demethylation reduction catalyst is recycled in the step 2; purifying the crude tannic acid-like compound solution to obtain a tannic acid-like compound; according to the method disclosed by the invention, the tannic acid can be efficiently converted into the tannic acid-like compound through modification treatment in combination with a microwave pyrolysis technology, and the problems of difficulty in large-scale extraction, uncontrollable product purity and activity and the like in extraction of the tannic acid compound from traditional natural resources can be effectively solved.

The invention relates to the technical field of lignin separation and catalytic conversion, in particular to a method for separation and in-situ catalytic conversion of lignin in woody biomass, which comprises the following steps: (1) mixing the woody biomass, a catalyst and a reaction solvent, and performing catalytic reaction to obtain a liquid product and a solid product; wherein the catalyst comprises a tungsten element, a phosphorus element and a carrier; (2) evaporating the liquid product to obtain a reaction product and a regenerated solvent; and (3) contacting the reaction product with an extraction agent for extraction to obtain an oil-phase product containing the phenolic monomer and a water-phase product containing the saccharide derivative. According to the method provided by the invention, the lignin in the woody biomass can be converted into the monophenol aromatic compound with high selectivity, and multi-stage and high-value utilization of the biomass can be realized.

The invention discloses a method for preparing phenol by utilizing a biomass raw material, which comprises the following steps: 1) crushing biomass, adding the crushed biomass into a caustic alkali solution to carry out hemicellulose removal treatment, and carrying out solid-liquid separation to take a solid substance, so as to obtain hemicellulose-removed biomass; 2) adding the hemicellulose-removed biomass into an ethylene glycol-ferric chloride eutectic solvent for lignin extraction, then adding an acetone-water mixed solution, then carrying out solid-liquid separation, taking a liquid substance, adding water to precipitate the lignin, then carrying out solid-liquid separation, and taking a solid substance to obtain the lignin; and 3) pyrolyzing the lignin in a protective atmosphere to obtain lignin oil containing phenol. The method for preparing phenol from biomass raw materials has the advantages of simple operation, high phenol yield, high product purity, low energy consumption, safety, environmental protection and the like, and is suitable for large-scale industrial application.

The present invention relates to a method for dissolving and controlling the molecular weight of a lignin material to prevent a potential reduction in its reactivity and thereby to control the viscosity of both the lignin material and the resulting condensation product. Thus, the method comprises dissolving lignin with a first portion of phenol under acidic conditions, followed by hydroxymethylation under alkaline conditions, and condensation and cross-linking to produce a final resin product.

The invention relates to the technical field of production of potassium fulvate, in particular to a process for producing edible alcohol and co-producing potassium fulvate by fermenting beet. The method comprises the following steps: performing coarse crushing and fine crushing on beet to form slurry, adding squeezed water, and collecting into an adjusting tank; transferring the slurry into a conversion tank for biological conversion, then carrying out solid-liquid separation treatment to obtain juice and wet residues, and squeezing the wet residues; mixing the juice with the wine mother liquor, performing two-stage fermentation to obtain fermentation liquor, and concentrating the fermentation liquor to obtain edible alcohol and waste liquor; distilling the waste liquid and adding a fulvic acid transforming agent for fermentative degradation, and then evaporating to remove moisture and concentrating to generate a concentrated solution; lime milk and the concentrated solution are uniformly mixed and stirred for neutralization, and the neutralized concentrated solution is dehydrated and dried to generate potassium fulvic acid dry powder. According to the method disclosed by the invention, polysaccharide substances in the beet are subjected to sufficient enzymolysis by utilizing the biotransformation agent, and sugar contained in the beet is sufficiently released, so that the utilization rate of beet sugar is increased.

The invention discloses a method for oxidative depolymerization of lignin through a deep eutectic solvent system containing reversible soluble alkali, and belongs to the technical field of efficient utilization of biomass resources, the method comprises the following steps: mixing a lignin raw material with the deep eutectic solvent system containing the reversible soluble alkali, adding hydrogen peroxide to carry out an oxidation reaction, after the reaction is finished, solid residues are centrifugally separated, CO2 is introduced into supernate obtained through centrifugation to remove reversible soluble alkali in reaction liquid, the lignin oligomer is precipitated through a gradient acid precipitation method, and the content of phenolic hydroxyl groups and carboxyl groups in the lignin oligomer can be adjusted by adjusting the dosage of the reversible soluble alkali and the dosage of hydrogen peroxide. The method can realize mild and efficient depolymerization of lignin, avoids a complex separation process for extracting solid lignin components, improves the separation purity of lignin, and is low in reaction solvent cost, simple in recovery process, convenient to operate, high in practicability and easy for industrial popularization.

The invention provides a method for carbon dioxide assisted organic solvent vapor-liquid phase oriented separation of wood fiber biomass, and belongs to the technical field of wood fiber biomass chemical engineering. According to the method, carbonic acid formed by CO2 and water is used as a mild and recoverable acid catalyst source, the CO2 cooperates with the extraction solvent to dissolve lignin and hemicellulose components, and vapor-liquid phase exchange of the extraction solvent is controlled by regulating and controlling the temperature change in the extraction process; the directional migration of components dissolved from lignocellulose in the vapor-phase solvent to the liquid-phase solvent is realized, the repeated recycling of the extraction solvent is realized, and the overall dosage of the extraction solvent in the treatment process is reduced. A large amount of dissolved lignin is finally enriched in a liquid phase part of the extraction solvent at the bottom of the reaction container along with phase conversion of the extraction solvent, and a cellulose component is retained in a solid phase material. The method provided by the invention not only realizes better lignin separation efficiency, but also greatly reduces the use amount of the extraction solvent.

The invention discloses a method for catalytically depolymerizing a lignin derivative and lignin depolymerized oil. The invention relates to a method for preparing lignin depolymerized oil rich in 1, 2-diphenylethyl structure bisphenol and lignin oligomer by a lignin derivative containing a 1, 1-diphenylmethyl structure under the synergistic catalysis of a transition metal catalyst, a hydrogen donor and an acid catalyst in a liquid medium. Directional depolymerization of lignin is realized by catalyzing aryl migration reaction of a 1, 1-benzhydryl structure, and different from traditional reaction taking lignin monophenol as a target product, one-step directional preparation of a bisphenol product and co-production of a lignin oligomer can be realized. According to the method disclosed by the invention, the product type of lignin-based bisphenol is expanded, and the application of catalytic depolymerization of lignin to preparation of high-value chemicals, fuels and polymer materials is promoted.

The present invention relates to a method for purifying lignin comprising the steps of: providing lignin in solid form, immersing the lignin in an acidic aqueous solution so as to remove metals from the lignin to the acidic aqueous solution and separating purified lignin from the acidic aqueous solution. The present invention also relates to lignin having a total metal content below 200 ppm. The purified lignin disclosed in the present invention may be further processed into carbon enriched materials.

The application discloses a method for separating non-condensed lignin and saccharide compounds from deconstructed lignocellulose. The lignocellulose is used as raw material, and a high-boiling alcohol aqueous solution such as dihydric alcohol or trihydric alcohol is added into an acid molten salt hydrate as a deconstruction reaction system. The acid molten salt hydrate hydrolyzes hemicellulose and cellulose in the lignocellulose into saccharide compounds, and the high-boiling alcohol in the system acts as a lignin dissolving agent and a structure protecting agent, so that the lignin is dissolved in the high-boiling alcohol. Then, water is added to precipitate the lignin, so that the non-condensed lignin and the saccharide compounds are separated. The biomass deconstruction method can effectively promote the full-component utilization of three components of lignocellulose, and has great industrial application potential.

A method for converting a lignin-derived material into at least one esterified lignin derivative, said method comprising the steps of: - providing said lignin-derived material selected from the group consisting of: lignin monomers; lignin depolymerization products; and combinations thereof; - providing an acidic composition having a pH of less than 1, said acidic composition comprising: o an acid selected from the group consisting of: sulfuric acid; an alkylsulfonic acid; and an arylsulfonic acid; and o an alcohol selected from the group consisting of C1-C8 linear alcohol and C3-C8 branched alcohol and mixtures thereof; - combining said lignin-derived material with said acidic composition into a reaction mixture; - heating up said mixture to a temperature ranging from 25°C to 120°C; and - allowing sufficient time of reaction to convert at least a portion of said lignin-derived material into said at least one esterified lignin derivative.

According to an example aspect of the present invention, there is provided an intumescent fire retardant composition comprising: an acid source comprising or consisting of ammonium phytate; and a carbon source selected from the group consisting of: carbohydrates, chemically modified lignins, tannin, and any combinations and derivatives thereof.

This invention provides a method for synthesizing thermoplastic polyurethane. [Solution] The present invention provides a method for synthesizing thermoplastic polyurethanes containing lignin-derived monomers, lignin-type compounds, or products obtained by the functionalization of each thereof in their structure. More specifically, the process relates to the use of 4-hydroxylalkylphenols and their derivatives as lignin-derived monomers or lignin-type compounds. These can act as chain extenders or become part of a polyol. The thermoplastic polyurethanes can be partially or completely bio-based.

The invention relates to methods of producing lignin epoxide adduct with thermoplastic properties. In particular the invention describes a method which can be performed under mild conditions, to obtain a lignin epoxide adduct with a low percentage of homopolymer of epoxide. The invention further relates to compositions and lignin epoxide adduct obtained using the described method.

This biomass extract is a water-soluble biomass extract which is extracted from a biomass raw material containing lignin or hemicellulose, and contains more carbon than the carbon content of saccharides contained in the biomass raw material. This method for producing a biomass extract comprises: heating and pulverizing a biomass raw material to prepare a biomass pulverized product; and extracting a biomass extract from the biomass pulverized product with water.

Disclosed herein is a photo-polymerizable coating with broad-spectrum antimicrobial properties designed for personal protective equipment (PPE), such as face masks.

A method for producing bio-oil from lignin, comprising the following steps: (a) extracting lignin into oligomers for 30 to 90 minutes, preferably 40 to 70 minutes, in the presence of at least one alcohol having 1 to 5 carbon atoms, preferably 1 to 2 carbon atoms, at the boiling point temperature of said alcohol, or, in the case of a mixture of alcohols, at the temperature of a higher boiling point alcohol, thereby obtaining a liquid phase comprising oligomers and at least one alcohol, and a solid phase comprising lignin substantially free of said oligomers; (b) operating under supercritical conditions in the presence of at least one alcohol having 1 to 5 carbon atoms, preferably 1 to 2 carbon atoms, at a temperature of 200°C to 300°C, preferably 220°C to 295°C, and at 40 bar to 170 bar, preferably 50 bar to 150 bar. Under bar pressure, the solid phase containing lignin substantially free of said oligomers obtained in step (a) is depolymerized for 5 to 150 minutes, preferably 10 to 130 minutes, to obtain: - (i) a gas phase; - (ii) a mixture comprising: an oil phase consisting of bio-oil, a liquid phase containing at least one alcohol, and a solid phase containing carbon residues (“char”), the oil phase consisting of bio-oil, and optionally unconverted lignin; (c) the oil phase consisting of bio-oil is recovered from the mixture (ii) obtained in step (b). The bio-oil obtained by the foregoing method can be advantageously used, for example, as an antioxidant or UV stabilizer, particularly as an antioxidant or UV stabilizer in biofuels, which can be used as is or blended with other fuels in automotive or aviation diesel engines. Furthermore, the bio-25 oil obtained by the foregoing method can be advantageously used as an antioxidant in, for example, vegetable oils and animal or plant fats, as bio-feedback materials to slow their rancidity during transport and storage.

Provided are compositions and processes concerning efficient downstream processing of products derived from organic acids pretreatment of plant materials.

To provide efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials.SOLUTION: The invention is related to compositions and processes concerning (i) recovery of organic acids from a cellulosic pulp derived from organic acid pretreatment of plant materials, (ii) treatment of cellulose recovered from the cellulosic pulp derived from the organic acid pretreatment of the plant materials prior to conversion to glucose, (iii) separating and cleaning lignin from a lignin suspension derived from the organic acid pretreatment of the plant materials, (iv) recovery of organic acids from an aqueous phase of the organic acid pretreatment of the plant materials, (v) recovery of residual organic acids from hemicellulose-containing fractions derived from the organic acid pretreatment of the plant materials, and (vi) an organic fertilizer produced from cellulose and hemicellulosic juice derived from the organic acid pretreatment of the plant materials.SELECTED DRAWING: None

The present invention relates to a deep eutectic solvent (DES) comprising at least one carboxylic acid which comprises at least two carboxylic acid functional groups and has a number of carbon atoms in the range of from 4 to 10; at least one alcohol which comprises at least two alcohol functional groups, and which is selected from the group consisting of alcohols having a number of carbon atoms in the range of from 2 to 12 carbon atoms, polyethylene glycol and polypropyleneglycol; and water in an amount of from 10 to 50 wt.% of the total weight of the deep eutectic solvent. It is also related to the use of these deep eutectic solvents of the invention, as solvents for solubilising lignin from a lignin material or for preparing a lignin prepolymer. Furthermore, it is related to a process for preparing a lignin prepolymer which involves the use of the deep eutectic solvents of the invention, as well as to the lignin prepolymer as such and its uses for producing films, coatings, insulating foams, adhesives, binders, composites or for fibre sizing or for radical curing.

In general, the present invention relates to lignin-derived monomers, as well as polymers prepared with these lignin-derived monomers. Furthermore, the invention relates to methods to prepare these monomers from feedstock rich in lignin, such as lignocellulosic biomass, as well as methods to prepare polymers with the obtained monomers.

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.