23results about How to "Increase economic value added" patented technology

The invention provides a method for reducing polymer adhesion in ethylene oligomerization. According to the method, a double-kettle series polymerization process is adopted, a phosphine-nitrogen ligand, a chromium metal compound and a cocatalyst are added into a first reaction kettle, a nucleating agent is added into a second reaction kettle, the reaction is carried out in the first reaction kettle in the early stage and transferred to the second reaction kettle in the later stage for continuous reaction, oligomer is converted into high polymer through the nucleating agent, and the high polymer is stored in a particle form; therefore, the phenomenon that the oligomer winds the stirring paddle is reduced or avoided, the aggregation of the polymer in the reaction kettle is greatly reduced, and the operation time of the device is prolonged. The catalytic system can catalyze the ethylene oligomerization reaction with high activity, the catalytic activity reaches up to 10 * 10 < 6 > g product / (molCr.h), the overall selectivity of 1-hexene and 1-octene with high added values can reach 90% or above, and the phenomenon that a polymer is hung on a stirring paddle is greatly reduced.

The invention relates to the field of chemical engineering and material engineering, and provides a method for preparing high-purity magnesium oxide through direct pyrolysis of magnesium sulfate. High-purity (hydrated) magnesium sulfate (MgSO4.nH2O, 0 < = n < = 7) is used as a raw material, the raw material is heated at 250-450 DEG C for 1-2 hours for dehydration and then ground into fine powder, high-temperature roasting is performed under the condition of no additive, and high-grade high-purity magnesium oxide (MgO > = 99.5 wt%) powder can be obtained. The magnesium oxide prepared by the method is high in purity, short in technological process and convenient for industrialization, SO2 gas generated by roasting can be recycled by lime water, and concentrated sulfuric acid by-products can be prepared by a traditional industrial method.

The invention discloses a method for preparing cyclopentadiene by cracking polydicyclopentadiene in the technical field of chemical production, which comprises the following steps: mixing polydicyclopentadiene powder with molybdenum pentachloride, methyl selenoglucose and p-tert-butylphenol, heating to 500-600 DEG C, condensing, collecting volatile fractions, and distilling and purifying to obtain the cyclopentadiene. Wherein the dosage of the molybdenum pentachloride is 0.2-2.0% of the mass of the polydicyclopentadiene powder, the dosage of the methyl selenoglucose is 1-10% of the mass of the polydicyclopentadiene powder, and the dosage of the p-tert-butylphenol is 5-15% of the mass of the polydicyclopentadiene powder. According to the method, the polydicyclopentadiene reclaimed material can be converted into the intermediate cyclopentadiene with high added value, so that the economic benefit in the material recovery process is improved, and the carbon emission is reduced.

The utility model discloses a preparation device of activated carbon for bagasse, which relates to the technical field of activated carbon and comprises an activation furnace and a carbonization furnace, the carbonization furnace is fixedly mounted at the top of the activation furnace, a feed inlet is arranged at the top of the carbonization furnace, a feed hopper is movably mounted at the top of the feed inlet, and a first control valve is fixedly mounted on the back of the carbonization furnace. A liquid inlet pipe is fixedly mounted at the bottom of the right side of the activation furnace, an electric control water valve is fixedly mounted at the top of the liquid inlet pipe, a supporting plate is fixedly mounted on the inner wall of the activation furnace, and a stirring mechanism is fixedly mounted at the top of the supporting plate. According to the device for preparing the activated carbon for the bagasse, the activated carbon is prepared from the bagasse by utilizing the activating furnace and the carbonizing furnace, the bagasse can be economically and effectively utilized, the economic added value of the bagasse is improved, the environment is protected, a new thought is also provided for comprehensive utilization of the sugarcane, and the method for preparing the activated carbon by taking the bagasse as the raw material can realize resource utilization.

The invention discloses a silica gel supported nickel-vanadium bimetallic catalyst and a preparation method and application thereof.The preparation method of the silica gel supported nickel-vanadium bimetallic catalyst comprises the steps that silica gel and a vanadium source are steeped and stirred in a first solvent to obtain steeped silica gel, the steeped silica gel is subjected to heat treatment to obtain solid powder, and the solid powder is dried to obtain the silica gel supported nickel-vanadium bimetallic catalyst; and loading a nickel metal complex as shown in a formula 2 on the solid powder to obtain the catalyst. The reaction activity of the nickel metal complex is improved, the nickel metal complex can be used for producing wide distribution / bimodal polyolefin plastomers (POP), and on the premise of ensuring wide molecular weight distribution, high-component end insertion is increased, and low-molecular weight end insertion amount is reduced, so that the mechanical property of the polymer is improved.

The present invention belongs to the technical field of solid waste recycling, and relates to a method and device for regulating the cracking products of waste organic polymer materials. The waste organic polymer materials and the harmful element removal composite auxiliary agent are uniformly mixed in a mass ratio of 90:10, and placed at 400-450°C for cracking reaction; the primary cracking product after the reaction is contacted with a catalyst and placed at 550-800°C to obtain a cracking product. The present invention reduces the sulfur and chlorine content in the cracking oil by more than 85% by separating the waste organic polymer materials from the catalyst during the cracking process, and separately controlling the harmful element removal process and catalytic cracking process conditions; by the reverse flow of the waste organic polymer materials and the catalyst during the cracking process, and regulating the catalyst temperature, the cracking products are produced with more low-carbon olefins and aromatics, which significantly increases the economic added value of the cracking products and promotes the technological transformation of the cracking industry of waste rubber, waste plastics and other materials.

A highly efficient method for recycling waste crystalline silicon solar cells includes the following steps: S1, placing the waste crystalline silicon solar cells in a mixed solution of phosphate and ammonium fluoride to react, dissolving the aluminum back surface and initially etching the silicon nitride layer, causing the silver grid lines to detach, resulting in solid-liquid separation of the silver grid lines and a filter cake; S2, continuing to immerse the filter cake in the mixed solution from step S1 to completely etch the silicon nitride layer, obtaining a silicon wafer; S3, immersing the silicon wafer in a sodium hydroxide solution to remove the surface oxide layer, cleaning, and drying to obtain a high-purity silicon wafer. This invention achieves highly efficient separation of silver and aluminum grid lines from the silicon wafer and precise removal of silicon nitride and oxide layers through a stepwise chemical etching strategy, achieving a total silicon wafer recovery rate of over 96%. The process is short, simple to operate, and has low reagent costs, effectively solving the pollution problem of waste crystalline silicon solar cells, demonstrating significant environmental benefits and economic value, and is easy to scale up and apply.

The present invention relates to the technical field of carbon fiber materials and composite materials preparation thereof, specifically a biomass-based silicon carbide composite fiber and a preparation method thereof and an electromagnetic absorption material. The present invention provides a biomass-based silicon carbide composite fiber, comprising a hollow carbon fiber and silicon carbide composited in the hollow carbon fiber; the hollow carbon fiber is a carbide of tree cotton fiber. The composite fiber provided by the present invention selects tree cotton fiber with a hollow morphology, high hollowness and large specific surface area as a raw material, and the hollow carbon fiber obtained after carbonization treatment is used as a carbon source to carry out a carbon thermal reduction reaction to introduce a silicon carbide phase to realize a carbon / silicon carbide composite fiber. Under the action of a catalyst, the silicon carbide component can shuttle inside the hollow carbon tube, increase the interface of the composite material and adjust its dielectric constant, so as to optimize the electromagnetic absorption performance; it can realize the application in the electrochemical direction, improve the economic added value of the tree cotton fiber and show multifunctional application.

The invention belongs to the technical field of refractory materials, and relates to a high-calcium-magnesium-calcium-titanium-zirconium brick for stainless steel smelting and a preparation method thereof. By preparing the high-calcium magnesium-calcium-zirconium sand, the magnesium-calcium-titanium sand and the composite binding agent for the oil shaft kiln, an existing magnesium-calcium brick for stainless steel smelting is replaced, and the high-calcium magnesium-calcium-titanium-zirconium brick has the advantages of being high in volume density, low in porosity and impurity content, more excellent in high-temperature resistance, erosion resistance, slag resistance and high-temperature abrasion resistance and the like; finally, the purpose of replacing a traditional magnesium-calcium brick refractory material for stainless steel smelting is achieved.

The invention discloses a creation method of 2-phenethyl alcohol biosynthetic rice with a rose fragrance type characteristic. The creation method comprises the following steps: taking an mDHS1 gene, a PAAS gene and a PAR gene to construct a pRHVc-mDHS1-PAAS-PAR recombinant plasmid, transforming the pRHVc-mDHS1-PAAS-PAR recombinant plasmid into a callus through an agrobacterium tumefaciens-mediated method, and carrying out screening and plant regeneration of resistant calluses to obtain rice with overexpressed mDHS1, PAAS and PAR genes. According to the rice, 2-PE can be effectively synthesized in rice endosperm. Based on a synthetic biological technology and metabolic engineering, the pRHVc vector is used for overexpressing mDHS1, PAAS and PAR genes in rice endosperm through a transgenic means, 2-PE is efficiently and directionally synthesized and stably enriched in rice grains, and the economic added value of rice crops is remarkably increased.

This invention discloses a high-functionality defatted rice bran, its preparation method, and its applications. The method includes: stabilizing fresh rice bran with saturated steam to inactivate lipase, obtaining stabilized rice bran; then using the stabilized rice bran as raw material, extracting and defatting it with supercritical CO2 to separate rice bran oil and high-functionality defatted rice bran. Preferably, the saturated steam treatment temperature is 115-125℃, and the time is 15-25 min; the supercritical CO2 extraction temperature is 45-55℃, the pressure is 25-35 MPa, and the time is 1.5-2.5 h. The defatted rice bran prepared by this invention has a fat content of less than 1.5%, a water-holding capacity of more than 3.0 g / g, an oil-holding capacity of more than 2.4 g / g, and an expansion potential of more than 5.8 g / g. This method is green and environmentally friendly, significantly improving the functional properties of defatted rice bran. The resulting product can be used as a high-dietary-fiber ingredient in baked goods, showing good application prospects.

The invention provides spicy crisp oyster mushrooms and a preparation method thereof, and belongs to the technical field of food processing, oyster mushrooms are used as raw materials, oyster mushroom leisure food is developed through the processes of selection, cleaning, boiling, pre-freezing, vacuum freeze drying, packaging and the like, and the product has the characteristics of spicy crisp taste, nutrition, health, convenience in carrying and the like.

The utility model discloses a double-pipeline sterile pipe connecting machine, which belongs to the technical field of pipe connecting machines and comprises a mounting base, a movable end, a fixed end and a movable end xy-axis moving component, and the movable end xy-axis moving component is in driving connection with the movable end and is used for driving the movable end to move along an X axis and a Y axis relative to a plane where the mounting base is located. Due to the fact that the two movable end clamping grooves, the two movable end cutting grooves, the two fixed end clamping grooves and the two fixed end cutting grooves are formed, under the action of the fixed end clamping assembly, the fixed end cutter assembly, the movable end clamping assembly, the movable end cutter assembly and the heat sealing heating piece assembly, the pipe connecting machine can be used for manually installing a pipeline once, and the pipe connecting efficiency is greatly improved. Butt joint of two pipelines can be completed at the same time, butt joint of a plurality of pipelines is completed in unit time, and the connection efficiency is improved; meanwhile, the equipment operation time is shortened, and energy conservation and emission reduction are facilitated; meanwhile, the service life of equipment is prolonged, the maintenance frequency is reduced, and the additional economic value of the equipment is improved.

The present invention belongs to the technical field of refractory materials, and relates to a high calcium magnesium calcium titanium zirconium brick for stainless steel smelting and a preparation method thereof. The present invention aims to replace the existing magnesium calcium brick for stainless steel smelting by preparing high calcium magnesium calcium zirconium sand, magnesium calcium titanium sand, and composite binder for oil shaft kiln. The high calcium magnesium calcium titanium zirconium brick has the characteristics of high bulk density, low pores and low impurities, and better high temperature resistance, corrosion resistance, slag resistance and high temperature wear resistance, and finally meets the purpose of replacing the traditional magnesium calcium brick refractory material for stainless steel smelting.

The present invention discloses a method for producing alpha-olefins, and relates to the technical field of alpha-olefin synthesis, in order to solve the problem that the polymer produced when producing alpha-olefins remains in the reactor and pipeline, affects the heat transfer of the reactor and the alpha-olefins are difficult to separate. The preparation method of the alpha-olefin includes: adding a solvent and a co-catalyst to a reactor containing ethylene, then adding a catalyst, carrying out an ethylene polymerization reaction, and obtaining alpha-olefins, wherein the alpha-olefins include 1-octene and 1-hexene. The preparation method of the alpha-olefin provided by the present invention is used for the production of alpha-olefins, and under the condition of not increasing the reaction temperature, the amount of polymer generated in the polymerization reaction can be minimized. At the same time, under the condition of not removing the solvent, 1-hexene and 1-octene can be directly separated and purified, which not only reduces the equipment investment, but also improves the yield of 1-hexene and 1-octene, and reduces the separation cost. In addition, after the polymerization reaction ends, the solvent does not need to be distilled and can be directly reused, which ensures the continuous operation of the device.

The invention discloses a method for producing single-cell protein for feeding from livestock and poultry manure biogas slurry, comprising the following steps: (1) preparation of manure biogas slurry: subjecting livestock and poultry manure to anaerobic fermentation by CSTR, adjusting the pH of the liquid after solid-liquid separation to 5-7, and preparing manure biogas slurry; (2) inoculating fungi: inoculating mixed fungal spores into the biogas slurry for cultivation; (3) recovery of fungi and production of single-cell protein: after the cultivation, separating mycelium and drying at 50-60°C to obtain single-cell protein. The invention ferments edible fungi with livestock and poultry manure biogas slurry as a substrate, generates fungal mycelium from organic matter in the biogas slurry, and recovers the mycelium to produce single-cell protein for feed protein supplement, while reducing the content of pollutants such as ammonia nitrogen in the biogas slurry, and only through a primary mixed fermentation reaction, not only single-cell protein with high economic added value is obtained, but also the purpose of purifying manure biogas slurry is achieved, the overall operating cost is low, low-carbon and environmentally friendly, and has broad application prospects in the field of resource utilization of livestock and poultry manure biogas slurry.

The invention provides a straw three-element separation method based on enzyme pretreatment and a DES solvent, belongs to the field of biomass resource utilization, and can solve the problems of high energy consumption, serious environmental pollution and low separation efficiency in the existing straw three-element separation method. Comprising the following steps: crushing straws, carrying out enzymolysis pretreatment by using cellulase and hemicellulase, mixing a solid obtained after solid-liquid separation with a DES solvent, and reacting for 2-4 hours under the conditions of 120-150 DEG C and 0.5-1.0 MPa to dissolve out lignin; centrifugally separating to obtain a DES solvent solution containing lignin and a solid precipitate containing cellulose and hemicellulose; filtering the DES solvent solution containing lignin through a ceramic membrane, and drying to obtain a lignin product; treating the solid precipitate with a hydrogen peroxide solution, carrying out solid-liquid separation, washing and drying to obtain a cellulose product; and combining the separation liquid and the washing liquid, concentrating, adding ethanol for precipitation, and drying to obtain a hemicellulose product. According to the invention, step-by-step efficient separation of three elements is realized, and the separation efficiency and the product purity are improved.

The invention belongs to the technical field of feed science and feed additives, and relates to a compound additive for laying hen feed and a preparation method of the compound additive. The compound additive for the laying hen feed is prepared from the following components in percentage by weight: 2 to 10 percent of DHA (docosahexaenoic acid), 2 to 6 percent of hexahydroxy flavone, 2 to 6 percent of herba epimedii total flavonoids, 5 to 15 percent of vegetable jute, 5 to 15 percent of vernonia esculenta, 2 to 10 percent of selenium-containing antioxidant enzyme, 2 to 10 percent of beta-carotene degrading bacteria, 2 to 10 percent of marine oligosaccharide probiotics, 5 to 15 percent of dried danbei powder, 3 to 10 percent of jerusalem artichoke polysaccharide, 3 to 15 percent of functional amino acid and 2 to 10 percent of polyphenol derivatives. The compound additive for the laying hen feed, disclosed by the invention, is added into a basic feed of laying hens, so that the effects of DNA, flavonoids, vegetable jute, vernonia esculenta, the freeze-dried powder of danbei, selenium-containing antioxidant enzyme, probiotics and the like can be fully exerted, the immunity of the laying hens is enhanced, the egg yield is increased, the egg laying interval of the aged laying hens is shortened, the economic value of the aged laying hens is improved, and the laying hens have good economic benefits. The higher-level development of the laying hen breeding industry is promoted.

The invention relates to the field of chemical engineering and material engineering, and provides a method for preparing high-purity magnesium oxide by taking ferronickel slag as a raw material, which comprises the following steps: (1) leaching: mixing ferronickel slag and sulfuric acid, leaching under normal-pressure heating and stirring conditions, and taking leachate after leaching; (2) primary crystallization: adding a seed crystal into the leachate, separating out coarse magnesium sulfate through primary crystallization, and carrying out solid-liquid separation to obtain coarse magnesium sulfate; (3) impurity removal: dissolving crude magnesium sulfate in water to obtain a magnesium sulfate crude solution, adding a neutralizing agent into the magnesium sulfate crude solution for neutralizing, hydrolyzing and removing impurities, and filtering to obtain a magnesium sulfate fine solution; (4) secondary crystallization: adding a seed crystal into the magnesium sulfate fine liquid for secondary crystallization to separate out high-purity magnesium sulfate; and (5) calcining: calcining the high-purity magnesium sulfate to obtain the high-purity magnesium oxide. The technology has the advantages of low equipment requirement, low production cost, high magnesium recovery rate, high magnesium oxide purity and high economic added value, and is convenient for industrial application.

The invention belongs to the field of water treatment, and particularly relates to a microbial community for treating wastewater in the food production process and a treatment method, and the microbial community comprises benthic diatom and symbiotic bacteria; wherein the benthic diatom is halaphalis coffeaeforms, and the symbiotic bacteria comprise a psychrobacter genus (Psychrobacter) and a halomonas genus (Halomonas), and the benthic diatom and the symbiotic bacteria can be used for preparing a biological agent for preventing and treating a disease caused by the fact that the benthic diatom and the symbiotic bacteria can be used for preventing and treating a disease caused by the disease caused by the fact that the benthic diatom is the Halomonas. According to the method, a one-step biological treatment method is adopted for the first time, no chemical reagent is used, nutrient elements are recycled in one step while waste water is recycled in the recycling process, and a new choice is provided for low-cost and sustainable waste water treatment.

The invention provides a phase-changeable electronic cigarette liquid and a preparation method thereof, and the phase-changeable electronic cigarette liquid is prepared from the following components in percentage by mass: 5-15% of tobacco extract, 10-19% of gel, 0.2-0.8% of sodium alginate, 5-15% of water, 20-25% of propylene glycol and the balance of glycerol. The gelling agent is carrageenan and / or low methyl pectin. The electronic cigarette liquid prepared from the raw materials of the types and the dosages can be kept in a solid state at the temperature lower than 70 DEG C, and storage and transportation are facilitated; the electronic cigarette liquid is sufficient in smoke amount, comfortable in smoke, almost free of residues and moderate in smoke strength. In addition, the raw material tobacco extract of the electronic cigarette liquid is the extract of the tobacco waste, so that the tobacco waste can be turned into wealth, and the economic added value of the tobacco waste is improved.

The invention belongs to the technical field of hydrometallurgy metal ore recovery, and particularly relates to a method for comprehensively recovering rare earth from low-grade zirconium concentrate. According to the method, conversion of zirconium and rare earth minerals in the zirconium concentrate is promoted through the working procedures of alkali fusion decomposition, water washing and transformation, valuable metal minerals are converted into minerals easy to dissolve, and the content of silicon and sodium in materials is reduced; in addition, the content of impurity elements in the material before acidolysis is further reduced through the rare earth optimal dissolution procedure, rare earth elements are comprehensively recycled, and meanwhile a foundation is laid for subsequent preparation of qualified zirconium oxychloride products. In addition, the zirconium oxychloride crystallization mother liquor is returned to the transformation and optimal dissolution process, the recovery rate of ZrO2 is 88% or above, the comprehensive recovery rate of rare earth is improved, the recovery rate is 83% or above, and the economic additional value of zirconium concentrate treatment is improved.

The invention provides a composite drying aid and application thereof in fruit powder preparation, and belongs to the field of food technology. The invention provides a composite drying aid, which is prepared from PREGEL-AW1600 starch and maltodextrin or PREGEL-AT0705 starch and maltodextrin or SPABI-AT0170 starch and maltodextrin or SH-52 and maltodextrin or HP-CF W0622 and maltodextrin, and provides an optimal mass ratio of the PREGEL-AW1600 starch to the maltodextrin or the PREGEL-AT0705 starch to the maltodextrin or the SPABI-AT0170 starch to the maltodextrin or the HP-CF W0622 to the maltodextrin. And the fruit powder is prepared from the concentrated fruit pulp by combining a composite drying aid with microwave drying, so that the problems that at present, the concentrated fruit pulp cannot be subjected to microwave drying to prepare powder, the drying time is relatively long, the drying effect is poor, nutrient substances are lost and the like are solved.