45results about "Pretreatment with acid reacting compounds" patented technology

The invention discloses a preparation method of a high-yield camellia oleifera shell pulp. The preparation method of the high-yield camellia oleifera shell pulp specifically comprises the steps of mechanical grinding, pre-impregnation, mechanical disc grinding treatment, washing, defibering and screening. The preparation method prepares the high-yield camellia oleifera shell pulp through a chemical and mechanical method; the prepared high-yield camellia oleifera shell pulp has the advantages of being high in yield, good in pulping performance and drainability and the like and can be applied tothe fields of paper-based packaging, molding and decorating materials and the like, thereby to some extent easing the stress brought about by shortage in papermaking fiber resources. Besides, a largenumber of waste camellia oleifera shells are applied to the fields of pulping and papermaking to achieve efficient and high-value application of agricultural waste.

The invention relates to the technical field of disposable tableware, and discloses a material for paper tableware and a preparation method thereof.The preparation method comprises the steps that sugarcane fibers and bamboo fibers are pretreated to obtain a fiber mixture, and a treatment solution is collected to serve as a byproduct sugar solution; carrying out enzymolysis treatment on the fiber mixture to realize microfibrillation and release ferulic acid to obtain microfibrillated fiber pulp; fermenting and dispersing by using a byproduct sugar solution to prepare bacterial cellulose nano pulp; mixing the microfibrillated fiber pulp with bacterial cellulose nano-pulp, and carrying out enzymatic crosslinking to obtain crosslinked fiber pulp; and adding a modified sizing agent into the cross-linked fiber pulp, blending into pulp, and carrying out molding, curing, hot pressing and drying treatment to obtain the material for the paper tableware. The mechanical strength, the water resistance, the oil resistance and the thermal stability of the paper tableware material are remarkably improved, and the waste liquid load is effectively reduced.

This invention discloses a compound microbial agent for the high-value utilization of all components of straw, its preparation method, and its application, relating to the field of agricultural waste resource utilization technology. The compound microbial agent comprises the following components by weight: 15-25 parts of lignin-protecting enzyme-producing bacterial powder, 20-30 parts of cellulase-producing bacterial powder, 25-35 parts of ethanol-fermenting bacterial powder, 10-15 parts of functional auxiliary bacterial powder, 5-10 parts of lignin protectant, and 5-10 parts of lignin shielding agent. This invention achieves the high-value utilization of all components of straw, with significant economic and environmental benefits, contributing to green innovation in the wood-based panel industry and the achievement of "dual carbon" goals.

The invention relates to the technical field of flame retardance of artificial boards, and discloses a method for preparing a high-flame-retardance-smoke suppression type light medium density fiberboard based on a metal ion complexing technology. The method comprises the following steps: firstly, carrying out swelling pretreatment on a wood fiber raw material by using an alkali-urea mixed solution, and then carrying out carboxylation modification to introduce a carboxyl functional group; then carrying out condensation polymerization on the carboxyl and an amine compound; anchoring metal ions on the surface of the fiber through a complexation reaction between an amine compound and metal ions such as aluminum, magnesium and calcium; and finally, carrying out heat treatment to convert metal ions into a nano metal oxide / hydroxide flame retardant in situ, and carrying out sizing, paving and hot press molding to obtain the medium density fiberboard. Through a chemical anchoring strategy of carboxylation-polycondensation-complexation-in-situ generation, molecular-level uniform dispersion and firm fixation of a flame retardant in wood fibers are realized, and the prepared board not only shows excellent flame-retardant and smoke-suppression performance, but also has enhanced mechanical properties, and has the characteristics of environmental protection and high efficiency.

The application discloses a preparation method of light fireproof sound-absorbing fiberboard and relates to the technical field of fiberboard materials.The method comprises the following steps: washing, cooking, hot grinding, adding black dye, adding a fire retardant, adding azodicarbonamide as an additive, spraying, hot pressing, and sawing.The temperature of the spraying is controlled within 100-110 DEG C, and the spraying amount is controlled within 30-50 kg / h.The fiberboard prepared by the method has a single-layer structure, has good sound-absorbing effect, does not need to be matched with sound-absorbing materials, can be thinnest to 9 mm, reaches the national fireproof B1-B level standard, and can reduce the density of the board to 600-700 kg / m 3 , so as to achieve the purpose of lightening.

The invention relates to the field of pulping and papermaking, in particular to a mediator-free laccase delignification bamboo pulp bleaching method which comprises the following steps: S1, mixing laccase and absolute dry pulp, adjusting pulp concentration, introducing oxygen at a certain temperature for reaction, washing with deionized water, spin-drying and scattering; the absolutely dry pulp is obtained by defibering, screening and drying unbleached chemical bamboo pulp. And S2, carrying out acid pickling chelation on the absolutely dry slurry treated in the step S1. And S3, bleaching the absolutely dry slurry treated in the step S2. According to the method, the lignin in the bamboo pulp is efficiently removed, the kappa number is reduced by more than 40%, the biological enzyme is directly used for replacing about 30% of total chemicals under the condition of not changing the section of an oxygen removal tower in the original process, and the consumption of chemicals and the discharge of bleaching wastewater in industrial production are reduced; and meanwhile, no expensive mediator is added, so that the problem of corrosion of the mediator to equipment is avoided, and the maintenance cost is greatly reduced.

The invention discloses a preparation method of acetified pulp, which comprises the following steps: firstly, pretreating a plant fiber raw material by using organic acid to destroy a lignin structure and dissolve out hemicellulose; then carrying out sulfate cooking, controlling the alkali consumption and the sulfuration degree, and completing purification of the cellulose at a preset temperature; further removing residual impurities through an alkali refining process; and finally, performing ECF bleaching and drying to obtain finished pulp. Through efficient cooperation of the three-stage process, the alpha-cellulose content, whiteness and reaction activity of the pulp are remarkably improved, meanwhile, the method has the advantages of being high in organic acid recovery rate, capable of recycling alkali liquor, low in wastewater treatment cost, wide in applicable raw material range and the like, and production can be achieved by simply modifying the sulfate pulp process.

The present application relates to the technical field of chemical fibers, and discloses a process for preparing lyocell pulp by mixing bamboo and wood pulp, comprising the following steps: bamboo pretreatment: cutting and shaping the bamboo, and then sequentially performing steam explosion defibration, acid treatment directional silicon removal and biological enzyme assisted delignification; wood pulp pretreatment: sequentially performing airflow sorting impurity removal, low-temperature alkali refining degreasing and biological enzyme deep purification; through the step-by-step directional pretreatment strategy, steam explosion causes microcracks in the cell wall of the short-cut bamboo fibers, and the high selectivity of the oxalic acid-ammonium fluoride composite acid liquid to silicate is used to achieve deep silicon removal of the short-cut bamboo fibers without damaging the cellulose skeleton; at the same time, the biological enzyme system step-by-step dissociates the hemicellulose side chain and the lignin aromatic ring structure, and removes the soluble oligomers, so that the risk of spinning blockage caused by silicon residues is eliminated under the premise of retaining the high polymerization degree cellulose of the bamboo, and the solubility of the pulp in the NMMO solvent is ensured.

The invention relates to the technical field of biotechnology, and discloses a microbial cellulose straw degradation, separation and screening method which comprises the following steps: performing multi-stage screening on strains, collecting humus soil samples, and performing three-stage screening on the humus soil samples through a cellulose-Congo red double-layer flat plate primary screening, liquid fermentation secondary screening and enzyme activity quantitative fine screening three-stage screening system. The preparation method comprises the following steps: preparing a cellulose degradation bacterial strain, separating to obtain a cellulose degradation bacterial strain, pretreating straws, crushing corn straws until the particle size is 0.5-2mm, removing a lignin barrier by adopting a diluted acid-alkali combined treatment method, and preparing a composite microbial agent; according to the method disclosed by the invention, a three-stage screening system of cellulose-Congo red double-layer flat plate primary screening, liquid fermentation secondary screening and enzyme activity quantitative fine screening is constructed, so that the capture precision of the efficient degradation strain is improved; the composite mutagenesis technology induces the bacterial strain to generate functional mutation, and the specific compounding proportion of the mutant strain and the original bacterial strain is combined to form a composite bacterial agent with a synergistic effect, so that the natural barrier of lignin-cellulose in the straw is broken, and the biodegradation efficiency of the cellulose is enhanced.

A method for processing a lignocellulose biomass material with a moisture content below 10 weight-% and an ash content below 1.0 weight-% includes: adding an acid catalyst to the lignocellulose biomass material; after adding the acid catalyst, thermally treating the lignocellulose biomass material with steam at an elevated pressure and an elevated temperature in at least one reactor; discharging the lignocellulose biomass material and blow steam from the at least one reactor using a steam explosion discharge device; and forming pellets and / or briquettes from at least part of the discharged thermally treated lignocellulose biomass material.

A process for hydrolysing plant-based biomasses, cardboard articles, cellulose residues and other hydrolyzable materials such as PLA, of any degree of moisture, using concentrated hydrochloric acid.

The invention discloses a preparation method of insulating slurry. The preparation method comprises the following operation steps: S1, raw material selection: selecting Chinese fir with different growth years for cutting; s2, chipping is conducted; s3, washing with water; s4, performing cooking; s5, pulp screening; s6, oxygen removal: carrying out lignin removal treatment on the paper pulp obtained in the step S5 in an oxygen and alkaline environment; s7, pulping: pulping the pulp by adopting a Varley mill or a disc mill, so that fibers are fibrillated, and the mechanical property of the pulp is enhanced; and S8, sheet making and performance detection: performing sheet making on the pulp in the S7 to form paper, performing performance detection on the prepared paper, and taking the pulp corresponding to the paper with the performance meeting the requirement as the insulating pulp. On the basis of conventional sulfate pulping, raw material selection and beating degree control are systematically researched, the provided preparation method of the insulation pulp is provided, the tearing index in the quality indexes of paper made of the prepared fir insulation pulp is not lower than 11.0 mN.m < 2 > / g, the conductivity is not higher than 3.0 ms / m, and the requirements of existing standards are met.

The invention relates to the technical field of chemical fibers, and discloses a process for preparing lyocell pulp by mixing bamboo wood and wood cotton and carrying out directional treatment, which comprises the following steps: bamboo wood pretreatment: sequentially carrying out steam explosion splitting, acid treatment directional silicon removal and biological enzyme assisted delignification on the cut and formed bamboo wood; the raw material wood cotton is sequentially subjected to airflow separation and impurity removal, low-temperature alkali refining and degreasing and biological enzyme deep purification; through a step-by-step directional pretreatment strategy, micro cracks are generated on cell walls of the chopped bamboo fibers through steam explosion, and deep silicon removal of the chopped bamboo fibers is realized without damaging a cellulose skeleton in cooperation with the high-selectivity dissolving capacity of oxalic acid-ammonium fluoride composite acid liquor to silicate; meanwhile, a hemicellulose side chain and a lignin aromatic ring structure are dissociated step by step by a biological enzyme system, and soluble oligomers are removed, so that the spinning blockage risk caused by silicon residues is eliminated on the premise that high-polymerization-degree cellulose of bamboo wood is reserved, and the dissolution smoothness of pulp in an NMMO solvent is guaranteed.

The application provides a method for co-producing organic acid, xylose and lignin from lignocellulose, which comprises the following steps: step one, component separation is performed on lignocellulose raw materials to obtain cellulose, xylose and lignin, wherein the method for component separation is alkali dissolution and acid precipitation and / or solvent treatment; and step two, acid production fermentation is performed on the cellulose in step one to obtain an organic acid mixture. The method provided by the application can efficiently separate xylose and lignin, and the step of producing acid is simple and controllable, and the effect of producing acid is good.

The present invention provides for a method to deconstruct a biomass comprising: (a) introducing one or more individual components of an ionic liquid (IL) or deep eutectic solvent (DES) to a biomass, wherein the one or more individual components, and optionally any components already present in the biomass, form an IL or DES, or mixture thereof, which solubilizes the biomass to form a solubilized biomass mixture, wherein at least one individual component is introduced to the biomass separately from any other individual component; (b) optionally introducing an enzyme and / or a microbe to the solubilized biomass mixture such that the enzyme and / or microbe produces a sugar from the solubilized biomass mixture; and, (c) optionally separating the sugar from the solubilized biomass mixture.

The present invention relates to an apparatus (1) for use in cellulose hydrolysis. The apparatus (1) comprises a channel (10) for guiding a stream of cellulose-containing waste in a flow direction (FD); one or more cylinder(s) (20) arranged to rotate around an axis (A), such that, when rotated, one or more side surfaces (21) of said cylinder(s) (20) exhibit a linear velocity vector orthogonal to said axis (A); and one or more complementary surfaces that face said side surfaces (21), such that, when the cylinder(s) (20) are rotated, the side surfaces (21) and complementary surfaces cooperate in grinding the waste. The present invention further proposes a respective method for cellulose hydrolysis.

It is provided a fractionation process of a lignocellulosic biomass feedstock producing biogenic carbon products comprising impregnating the lignocellulosic biomass feedstock with water producing an impregnated wet solid fraction after draining the liquid; raising the temperature of the impregnated wet solid fraction by adding steam producing steamed wet solids; adding water to said steamed wet solids to a ratio of liquid to solids below 16 obtaining a mixture of liquid and steamed wet solids; filtering the mixture of liquid and steamed wet solids producing an hydrolysate fraction and a wet solid fraction; concentrating the hydrolysate fraction to obtain a concentrated sugar solution which can be converted into humins; drying the wet solid fraction and mixing the dried wet solid fraction in an ethanol solution containing a mineral acid producing a slurry; heating the slurry and filtering the heated slurry producing a liquid phase, a solid cake containing lignin oligomers convertible into biofuels and an acid-impregnated cellulose-rich residue.

The invention discloses a method for efficiently extracting straw hemicellulose through physical and chemical synergistic reinforcement, and relates to the field of comprehensive utilization of crop straws. The method comprises the steps of raw material pretreatment, alkali liquor preparation and mixing, ultrasonic pretreatment, alkali liquor extraction, pH adjustment, supernatant separation and concentration, hemicellulose precipitation, separation post-treatment and the like, and the core is to destroy a straw cell wall structure by utilizing an ultrasonic cavitation effect through cooperation of an ultrasonic physical effect and an alkali liquor chemical effect so as to enhance the permeability and improve the hemicellulose separation efficiency. And connecting bonds of the hemicellulose and other components are dissociated in cooperation with low-concentration alkali liquor, and efficient separation and extraction of the hemicellulose are achieved. The extraction rate of the straw hemicellulose can reach 85% or above, the concentration of the used alkali liquor is only 0.5-10%, the extraction time is only 1-1.5 hours, and the chemical structure of the hemicellulose can be completely reserved. The method is easy to operate, low in cost, environmentally friendly, suitable for various raw materials such as corn straw and wheat straw and capable of being popularized on a large scale, and an effective technical scheme is provided for high-value utilization of straw biomass.

Disclosed is mechanical and decolorization pretreatment of cotton-containing textiles, such as "trash" feedstock in terms of end-of-life-cotton textiles, that may be used to produce sugar without the use of harsh pretreatments conditions.

An aqueous composition comprising: sulfuric acid; a compound comprising an amine moiety; a compound comprising a sulfonic acid moiety; and a peroxide. Said composition being capable of delignifying biomass.

A process for producing a partially hydrolysed cellulose material is disclosed. The process may comprise providing a cellulose material as a suspension, partially hydrolysing the cellulose material in the presence of an acid, and simultaneously mechanically treating the cellulose material so as to break fibres of the cellulose material, thereby obtaining the partially hydrolysed cellulose material.

The invention relates to a carbon-based fuel combustion ash washing liquid which is a liquid mixture containing carbon-based fuel combustion ash and / or a carbon-based fuel combustion ash dissolved matter. The invention also provides an application of the carbon-based fuel combustion ash water washing liquid in biomass sugar conversion and process, and the carbon-based fuel combustion ash is used for lignocellulose pretreatment and promotion of enzymolysis and fermentation, so that the waste liquid treatment, enzymolysis and fermentation cost in the biorefinery process of lignocellulose can be reduced; the method has the advantages that the method is simple and convenient to operate, the alkaline carbon-based fuel combustion ash content in the thermoelectric supply link can be treated, the carbon-based fuel combustion ash content in the thermoelectric supply link can be recycled, waste is turned into wealth, and introduction of exogenous organic and inorganic base catalysts and introduction of an enzymolysis buffer agent and fermentation nutritive salt in the traditional biomass fermentation conversion process are avoided. The method has the advantages of low cost, remarkable environmental benefits and the like.

The present invention relates to a method for producing a delignified and densified wood product. The wood is delignified in the form of a veneer using process conditions corresponding to the sulfate process. The wood veneer is subjected to a pre-hydrolysis treatment prior to a process step corresponding to the sulfate process. The invention also relates to a delignified and densified wood product produced using said method. The delignified and densified wood product according to the invention has particularly advantageous strength properties.

This invention discloses a method for preparing oleophilic and hydrophobic corn stalk fibers for asphalt mixtures, belonging to the technical field of asphalt mixtures. The preparation method first involves crushing and screening mature corn stalks, then softening and alkalizing the resulting corn stalk fragments under high temperature and pressure. The corn stalk fragments are then milled to obtain corn stalk fibers. Next, a plant fiber oleophilic and hydrophobic modifier is prepared using potassium hydroxide solution and carbon disulfide solution. The modifier and fibers are simultaneously added to a vacuum pressure impregnation device to impregnate and modify the resulting corn stalk fibers, obtaining the desired oleophilic and hydrophobic corn stalk fibers for asphalt mixtures. This invention can improve the oil absorption of corn stalk fibers while reducing their hydrophilicity. Adding the modified corn stalk fibers to asphalt mixtures can effectively improve the performance of asphalt mixtures, demonstrating significant practical value.

A process for hydrolysing plant-based biomasses, cardboard articles, cellulose residues and other hydrolyzable materials such as PLA, of any degree of moisture, using concentrated hydrochloric acid.

Disclosed herein are methods for producing a pulp or paper product from a plant material having bast and hurd fibers, such as a cannabis plant material. For example, there is method for producing a pulp or paper product from a plant material having bast and hurd fibers, the method comprising processing of a plant hurd fiber material into a hurd fiber pulp or pulp slurry in a first stream; processing of a plant bast fiber material into a bast fiber pulp or pulp slurry in a second stream; blending of the hurd fiber pulp or pulp slurry and the bast fiber pulp or pulp slurry to provide a blended pulp or pulp slurry; and producing the pulp or the paper product from the blended pulp or pulp slurry. Also provided are pulp and paper products produced from such methods. Also provided are cannabis pulp and paper products.

The present invention is directed to a process for preparing a delignified and densified wood product. The wood is delignified in the form of veneers, using process conditions corresponding to the Kraft process. The wood veneers are subjected to a pre-hydrolysis treatment before the process steps corresponding to the Kraft process. The present invention also relates to a delignified and densified wood product produced using said process. The delignified and densified wood product according to the present invention has particularly advantageous strength properties.

A method for treating biomass material such as lignocellulose biomass is provided The method comprises impregnating (201) the biomass material with sulfur dioxide and / or sulfurous acid, and subjecting the biomass material to hydrothermal treatment (202) in a pretreatment reactor. The method further comprises controlling the treatment severity of the hydrothermal treatment by controlling (203) the sulfur dioxide partial pressure in the pretreatment reactor. A system for treating biomass material is also provided.