392results about How to "Increase added value" patented technology

The invention provides a preparation method of an acid-resistant and chlorine-corrosion-resistant porous composite electrode and a device constructed on the basis of the electrode and used for preparing hydrogen and chlorine by electrolyzing a sodium chloride solution, two cavities are provided, an acid or neutral saturated sodium chloride solution is filled in the cavities, the cavities are separated by a proton exchange membrane or a diaphragm, and the proton exchange membrane or the diaphragm is filled in the cavities. And in the electrolysis process, the cathode generates high-purity hydrogen, the anode generates high-purity chlorine, the chlorine is absorbed by sodium hydroxide in the gas collection bottle and generates sodium hypochlorite, or the chlorine is introduced into a sodium bromide / sodium iodide solution to replace bromine / iodine elementary substances, and the chlorine is discharged from the gas collection bottle. The sodium hypochlorite solution and the bromine / iodine water are used for disinfection and sterilization experiments. The corrosion-resistant porous composite electrode for electrolysis of an acidic or neutral saturated sodium chloride solution is prepared, the electrolysis voltage of the corrosion-resistant porous composite electrode is further reduced by loading a cathode / anode catalyst, and an acidic or neutral saturated sodium chloride solution electrolysis device constructed based on the electrode can be used for preparing high-purity hydrogen and chlorine.

The invention relates to a high-performance room-temperature self-repairing polyurethane elastomer and a preparation method thereof.The polyurethane elastomer is synthesized from diisocyanate containing asymmetric aliphatic rings, polyether glycol or polyester glycol and a dynamic hydrogen bond chain extender, linear and non-linear hydrogen bonds exist in a polyurethane molecular chain at the same time, and the linear and non-linear hydrogen bonds are different from each other. The existence of the linear hydrogen bonds endows the material with good mechanical properties, the non-linear hydrogen bonds also enable the polyurethane elastomer to maintain the strength and realize the self-repairing effect at room temperature, and the high steric hindrance of the asymmetric aliphatic ring structure can inhibit the crystallization of the polyurethane chain segment, thereby enhancing the transparency of the polyurethane. Compared with the prior art, the polyurethane elastomer prepared by the invention has excellent tensile property, tensile strength of more than 30MPa, fracture strain of more than 1000%, good self-repairing property, repair efficiency of more than 80% after repairing for 48 hours at room temperature under the assistance of trace water, and good transparency.

The invention relates to an anorthite material and a preparation method thereof. The adopted technical proposal comprises the following steps of: according to (ZL200510019664.3) patent technology, namely a method for preparing titanium and a titanium alloy by utilizing titanium-containing furnace slag, taking molten tailings which is extracted with the titanium alloy as a raw material, adding 20 to 50 weight percent of silica, 0 to 60 weight percent of clay and 0 to 40 percent aedelforsite, and cooling a melt to obtain the anorthite material after the mixture is completely molten and a bath composition is uniform; or taking cold tailings extracted with the titanium alloy as the raw material, adding 20 to 50 weight percent of the silica, 0 to 60 weight percent of the clay and 0 to 40 percent the aedelforsite, carrying out mix grinding on the raw material and the admixture until the particle size is less than 0.1 mm, performing blank compression, and calcining the mixture at a temperature of between 1,200 and 1,400 DEG C to obtain the anorthite material. The method takes the tailings extracted with the titanium as the raw material, saves precious bauxite resources, has low cost, ensures that industrial residue is utilized with high added value, is environment-friendly and has simple process.

The invention discloses a comprehensive utilization process for kaolin tailings. The comprehensive utilization process comprises the following steps: scrubbing the kaolin tailings; the scrubbed kaolin slurry is sieved by a 5mm linear sieve, waste rocks of + 5mm are used as sand-gravel materials, and the waste rocks of-5mm are classified into 2-5mm, 0.1-2mm and-0.1 mm; the method comprises the following steps: grinding and grading ore with the particle size of 2-5mm, returning and regrinding the ore with the particle size of + 0.6 mm, removing tail mud with the particle size of-0.045 mm by grading the ore with the particle size of-0.6 mm, carrying out magnetic separation on the ore with the particle size of 0.045-0.6 mm, carrying out 1-2 sections of strong magnetic separation on the obtained magnetic separation concentrate to obtain strong magnetic concentrate, heating, adding chemicals, scrubbing, and carrying out chemical removal, desliming and washing to obtain primary photovoltaic glass sand and graded fine sand; the method comprises the following steps of: grinding and screening the ore with the particle size of 0.1-2mm, grinding and screening the ore with the particle size of + 0.6 mm until the ore with the particle size of-0.6 mm is completely ground, carrying out spiral chute reselection on the ore with the particle size of-0.6 mm to obtain heavy ore and light ore, carrying out 2-3 sections of magnetic separation on the light ore to obtain magnetic concentrate, carrying out flotation to obtain mica, carrying out graded desliming on the product in a flotation tank, and carrying out graded fine sand with the particle size of-0.1 mm; carrying out heating, chemical adding and scrubbing at the particle size of 0.1-0.6 mm, and then carrying out chemical removal, desliming and washing to obtain secondary photovoltaic glass sand; the yield of the obtained product is higher, and the product index is better.

The present invention discloses a heated instant reconstituted bamboo shoot rice, and relates to the technical field of food processing, and the heated instant reconstituted bamboo shoot rice comprises the following components in parts by weight: 42-46 parts of coarse rice powder, 38-42 parts of rice powder, 14-16 parts of bamboo shoot powder, 33-36 parts of fresh bamboo shoot sauce, and 0.6-0.7 part of monostearin. The preparation method comprises the following steps: respectively removing impurities from the dried bamboo shoots, the crushed brown rice and the crushed rice, crushing and sieving to obtain bamboo shoot powder, brown rice powder and rice powder; preparing fresh bamboo shoot sauce; weighing the brown rice flour, the rice flour, the bamboo shoot powder, the fresh bamboo shoot sauce and the monostearin according to the proportion, and uniformly stirring and mixing to obtain a loose and wet powdery mixed material; putting the mixed material into a nine-section twin-screw extruder, and extruding and curing step by step; extruding the cured mixed material into rice grains from a die hole by adjusting the rotating speed of a rotary cutter of an extruding machine; and drying the formed rice grains to obtain the regenerated bamboo shoot rice product. The prepared instant heated reconstituted bamboo shoot rice integrates the nutritional ingredients of the brown rice, the rice and the bamboo shoots, the cost performance is high, and the utilization rate and the additional value of the bamboo shoot raw materials, the brown rice and the crushed rice are increased.

The invention relates to a synchronous grouting material based on muddy silt shield muck and a preparation method thereof, and the synchronous grouting material comprises the following raw materials in parts by weight: 13 to 16 parts of cement, 16 to 20 parts of slag, 142 to 147 parts of fine sand containing silt powder, 0.03 to 0.1 part of trimethylsilyl ethyl acetate, 0.07 to 0.17 part of disodium hydroxyethylphosphonate, 0.03 to 0.1 part of pentasodium amino trimethylene phosphonate and 63 to 67 parts of water. According to the invention, the fine sand containing mud powder is used as a main raw material to replace bentonite and fine sand in synchronous grouting in the prior art, and is combined with a specific cement additive, so that the compressive strength and the impermeability of the synchronous grouting material are effectively improved through the synergistic effect of the components, local materials can be used, and the outward transportation and disposal cost of a large amount of muck can be greatly reduced.

The invention discloses a method for preparing PDRN with different molecular weights and application of the method. Salmonidae testis are taken, protamine cells are subjected to enzymolysis through protease K, enzymatic hydrolysate is pretreated through ultrasonic waves, a pretreated sample is subjected to DNaseI enzymolysis, and therefore PDRN with the target molecular weight is obtained. According to the method, the problem of single molecular weight of PDRN in the prior art is solved, and products with different molecular weight ranges can be accurately prepared by combining ultrasonic treatment with DNaseI enzymolysis, namely changing the power and time of ultrasonic treatment and the enzyme amount and enzymolysis time of DNaseI; the molecular weight range can be concentrated in 500-1000 bp, 1000-2000 bp and 2000-4000 bp, the situation that the molecular weight range is wide and fragments are not concentrated is effectively avoided, the product specification is relatively concentrated, and the method is suitable for industrial application.

The invention provides a process system and a process method for recycling a hexafluoropropylene oxide byproduct high-boiling residue, and relates to the field of fine fluorine chemical industry. The process system comprises a heat exchange device, a tubular pyrolysis reaction device, a carbonyl fluoride-trifluoroacetyl fluoride separation tower, a tubular cracking reaction device, a water washing device and an alkali washing device. According to the method disclosed by the invention, the industrial-grade carbonyl fluoride and trifluoroacetyl fluoride are prepared by catalytically pyrolyzing the hexafluoropropylene oxide by-product high-boiling residue; furthermore, a byproduct high-boiling residue of hexafluoropropylene oxide is subjected to complete catalytic cracking to obtain carbonyl fluoride, and a byproduct industrial hydrofluoric acid can be obtained. According to the process system and the process method, the hexafluoropropylene oxide byproduct is recycled into carbonyl fluoride, trifluoroacetyl fluoride and industrial hydrofluoric acid with high added values, harmlessness and recycling of the hexafluoropropylene oxide byproduct high-boiling residues are achieved, the utilization rate of fluorine atoms is 100%, and the process method is mild in reaction condition, economical and environmentally friendly.

The invention relates to the technical field of electronic ceramics, in particular to a low-cost ultra-low dielectric microwave dielectric ceramic material and a preparation method thereof.The low-cost ultra-low dielectric microwave dielectric ceramic material comprises, by mass, 4.1% of MgO, 36.4% of H2SiO3, 31.5% of Al2O3 and 28% of talc, talcum powder and Al2O3, H2SiO3 and MgO with the purity larger than or equal to 99% serve as initial raw materials, the microwave dielectric material Mg2.15 Al4Si5O18.15 is prepared through a solid-phase sintering method, and the microwave dielectric ceramic material is prepared through a microwave sintering method. The microwave performance of the material is excellent, the dielectric constant epsilon r is 3.82-4.42, the quality factor Q * f is 36653-64628 GHz, and the temperature coefficient of resonance frequency tau f is-26.02--24.80 ppm / DEG C. The ultra-low dielectric microwave dielectric ceramic material adopts talc to replace part of a silicon raw material and a magnesium raw material, the content of the silicon raw material and the magnesium raw material is greatly reduced, compared with the silicon raw material and the magnesium raw material, the talc is extremely low in cost, and the cost is low. The raw material cost is reduced, the preparation is easy, and great commercial potential is achieved. In addition, the added value of talc is improved, and development of related industries is promoted.

The invention belongs to the field of comprehensive utilization of coal chemical solid waste, and particularly relates to a treatment method of direct coal liquefaction residue raffinate, which comprises the following steps: (1) mixing direct coal liquefaction residue and an extraction agent to obtain an extraction system, and carrying out solid-liquid separation on the extraction system to obtain filtrate and filter residue; (2) carrying out distillation treatment on the filtrate to obtain asphalt; and (3) drying the filter residue to obtain a solid, and carrying out pyrolysis treatment on the solid to obtain pyrolytic oil. The method disclosed by the invention has the beneficial effects that the direct coal liquefaction residues are changed into products with industrial application values through a segmented processing method, so that an energy-saving, emission-reducing and resource-saving development mode is realized; a solution is provided for solving the problems of land occupation caused by accumulation and landfill of the direct coal liquefaction residues and serious damage to the ecological environment, and a new way with a wide market economic prospect is explored for realizing high-value utilization of liquefaction residue resources.

The invention discloses a plastic product prepared from waste mulching films and a preparation method of the plastic product, relates to the field of recycling of mulching films, and solves the problems that in the prior art, when the waste mulching films are recycled, after the mulching films are crushed, mulching film particles need to be cleaned with water, so that a large amount of water resources are consumed in the production process, and the production cost is reduced. And a certain amount of sewage can be generated. According to the invention, the recycled waste plastic is crushed without cleaning, the linear (longitudinal) mulching film raw material low density polyethylene (LDPE) is used as a cross-linking agent, and a reinforcing material is added to improve the environmental adaptability such as compression resistance, freezing resistance, fracture resistance and aging resistance of the mulching film; the mulching film impurity removal device can be processed into energy-saving and environment-friendly novel building materials such as plastic footpath bricks, road barriers, agricultural canal profiles and trays for transportation and cargo carrying of the building materials, the requirement for impurities entrained by an agricultural film is not strict, and in the mulching film impurity removal process, water cleaning and manual impurity removal procedures are not needed, so that water resources are saved.

The embodiment of the invention provides a lithium iron manganese phosphate positive electrode material and a preparation method thereof, a positive electrode plate and a lithium ion battery, the preparation method comprises the following steps: dispersing a lithium source and a phosphorus source in a dispersant, then adding a manganese source and lithium iron phosphate to form a uniform mixed slurry, the proportion of a solid substance is greater than or equal to 45%, and the dispersant comprises ethylene glycol and / or water; placing the mixed slurry in a closed device, and carrying out a synthetic reaction under a certain condition to obtain a lithium manganese iron phosphate precursor; and carrying out high-temperature sintering on the lithium manganese iron phosphate precursor to obtain the lithium manganese iron phosphate positive electrode material. According to the preparation method of the lithium iron manganese phosphate positive electrode material provided by the embodiment of the invention, lithium iron phosphate is adopted as a template, the lithium iron manganese phosphate positive electrode material with high compaction and high performance is synthesized, no waste material or waste gas is generated, and the method is green and environment-friendly; the dispersing agent is small in usage amount and simple and efficient in process; the reaction atom utilization rate is high, the dispersant can be recycled, and the cost can be reduced; the method can be used for recycling the LiFePO4 material, and the additional value of the LiFePO4 material

The invention discloses an anti-pilling acrylic fabric and a production method thereof.The production method includes the steps that acrylic fibers and acetate fibers are blended to obtain blended yarn, the blending ratio of the acrylic fibers to the acetate fibers is 50: 50, the spinning count is 50 S, during blending, the specification of the acrylic fibers is 0.8 D * 38 mm, the acetate fibers are 1.2 D * 38 mm cotton-type short fibers, the specification of the acrylic fibers is 0.8 D * 38 mm cotton-type short fibers, the specification of the acetate fibers is 0.8 D * 38 mm cotton-type short fibers is 0.8 D * 38 mm cotton-type short fibers, and the specification of the acrylic fibers is 0.8 D * 38 mm cotton-type short fibers; weaving the blended yarns into a warp satin weave fabric, wherein the warp and weft density is 787 * 374 / 10cm; the fabric is processed through the steps of preparing, spinning, slashing, weaving and finishing and dyeing. According to the invention, the acetate fiber is adopted as a raw material and is blended with the anti-pilling acrylic fiber, so that the acetate fiber has good natural air permeability and quick drying, not only keeps the warm keeping and softness of the acrylic fiber, but also embodies the brilliant color, bright appearance, smooth contact, easy care and wrinkle resistance of the acetate fiber.

The invention discloses a solid-waste-based marine engineering cementing material, a preparation method thereof and an offshore wind power grouting material, and relates to the technical field of concrete materials, the solid-waste-based marine engineering cementing material comprises 200-400 parts of modified tailings, 50-100 parts of ceramic polishing mud, 50-100 parts of fluorgypsum, 100-150 parts of red mud, and 10-30 parts of an activator, the modified tailings are obtained by acidizing tailings powder, mixing the acidized tailings powder with carbide slag, grinding the mixture and activating the mixture at the high temperature of 600 DEG C or above, and the exciting agent comprises a stabilizing component and an exciting component. The solid waste-based cementing material is prepared by using the gold tailing powder with a huge stockpiling amount as a main material and cooperatively utilizing solid wastes such as the ceramic polishing mud, the fluorgypsum and the red mud, and the offshore wind power grouting material with excellent workability, mechanical property and durability is further prepared from the solid waste-based cementing material, the tunnel hole slag machine-made sand and various additives.

The utility model relates to a system for preparing electronic-grade hydrochloric acid by using a Mannheim device. Comprising a potassium chloride storage tank, a desalted water pipeline and a concentrated sulfuric acid storage tank, the potassium chloride storage tank and the concentrated sulfuric acid storage tank are respectively connected with a Mannheim furnace, a byproduct hydrogen chloride gas pipeline of the Mannheim furnace is connected with a B acid washing tower, a gas pipeline in the B acid washing tower is connected with an A acid washing tower, and a gas pipeline in the A acid washing tower is connected with an inlet of a drying tower; a spraying pipeline at the upper part in the drying tower is connected with a concentrated sulfuric acid storage tank; a gas phase outlet of the drying tower is connected with an electronic-grade hydrochloric acid storage tank through a gas purifying and absorbing unit and a filtering unit in sequence; a bottom liquid phase outlet of the drying tower is connected with a concentrated sulfuric acid inlet of the Mannheim furnace; the method has the advantages of improving the added value of products and reducing the production cost.

The invention provides a yellow long-afterglow ceramic low-temperature overglaze color pigment as well as a preparation method and application thereof, and belongs to the technical field of ceramic pigments. Noctilucent powder SrAl2O4: Eu < 2 + > and Dy < 3 + > and fluorescent powder Y3Al5O12: Ce < 3 + > or Y3Al5O12: Ce < 3 + > and Gd < 3 + > are combined according to different proportions to form a yellow long-afterglow luminescent pigment, then the yellow long-afterglow luminescent pigment is mixed with a glaze surface combination auxiliary agent, and the low-temperature overglaze color pigment with yellow long-afterglow emission is obtained by utilizing a new principle and technology of energy transfer and reflection-compensation, can be fired on a glaze surface at a relatively low temperature, and has the characteristics of long-afterglow emission and long-afterglow emission. Bright yellow body color is displayed under sunlight or an artificial light source; in the dark, afterglow emission which is adjustable from yellow green to yellow is shown. The yellow long-afterglow ceramic low-temperature overglaze color pigment provided by the invention can improve the unique decorative effect of porcelain, enrich the color of the porcelain and improve the added value of ceramic products, and is a novel luminous pigment with excellent performance.

The invention discloses a method for refining and recovering tail gas of hydrogen chloride. The method comprises the following steps: 1) compressing the tail gas to a high-pressure state through a compressor; (2) introducing the high-pressure gas obtained in the step (1) into a refining tower for separation, obtaining non-condensable gas containing HCl at the tower top, extracting a high-purity hydrogen chloride product from the tower, and obtaining a liquid phase containing organic matters at the tower kettle; and 3) feeding the non-condensable gas at the tower top of the refining tower to a downstream absorption unit, feeding the product hydrogen chloride in the tower to the periphery for supply, decompressing the liquid phase at the tower bottom, and returning to the upstream for recycling. The method can reduce 75% of energy consumption, finally realizes purification of hydrogen chloride gas containing non-condensable gas and organic matter impurities, reduces the amount of waste gas and the amount of byproduct hydrochloric acid, produces high-purity hydrogen chloride products with high added values, realizes efficient circulation of chlorine resources in a park, and has remarkable economic benefits and social benefits.

The invention relates to the technical field of high-value chemical recycling of waste plastics, in particular to a method for producing a high-value product through mixed catalytic cracking of waste plastics and heavy oil, which comprises the following steps: A) crushing the waste plastics, and carrying out anhydrous cleaning treatment to obtain clean waste plastic fragments; b) mixing the clean waste plastic fragments with a solvent in a liquefaction unit, and heating and liquefying to obtain waste plastic liquefied liquid; c) filtering the waste plastic liquefied liquid in a filtering unit; d) contacting the filtered filtrate with a fluidized catalyst in a catalytic cracking unit for catalytic cracking reaction to obtain an oil-gas mixture and a spent catalyst; e) performing product separation on the oil-gas mixture; heavy oil is recycled to the liquefaction unit; conveying the spent catalyst to a catalyst regeneration unit, and regenerating under an aerobic condition; the regenerated hot catalyst circularly enters the catalytic cracking unit. According to the invention, high-valued cyclic utilization of the waste plastics can be realized.

The invention relates to the field of polyethylene wax preparation, and discloses a preparation method of polyethylene wax, in order to solve the problems that in an existing preparation method, energy consumption is high, and the production cost is greatly increased, the preparation method specifically comprises the following steps that S1, raw materials are prepared, high-molecular-weight polyethylene resin, a catalyst and a modifier are prepared, and the modifier is an oxygen-containing monomer; s2, low-temperature catalytic cracking: adopting a continuous low-temperature cracking reactor, and adding a high-molecular-weight polyethylene resin raw material into the reactor; s3, carrying out molecular functional modification; and S4, carrying out post-treatment and purification. According to the preparation method of the polyethylene wax, low-temperature catalytic cracking is carried out at a relatively low temperature, so that the energy consumption and the production cost are reduced, meanwhile, by-products and harmful substances possibly generated by high-temperature cracking are reduced, and by carrying out molecular functional modification and introducing polar groups, the application field of the polyethylene wax is expanded, and the additional value of the polyethylene wax is improved.

The invention provides a preparation method of high-gel-quality low-salt minced shrimp gel, which comprises the following steps: S1, chopping and mixing shrimp meat to obtain minced shrimp meat; s2, adding salt into the minced shrimp meat, and chopping to obtain minced shrimp; s3, adding alkaline amino acid into the minced shrimps, and chopping to obtain amino acid-minced shrimps; and S4, heating and cooling the amino acid-minced shrimps to obtain the high-gel-quality low-salt minced shrimp gel. According to the preparation method disclosed by the invention, the texture property, texture and taste of the low-salt minced shrimp gel are improved, so that the indexes such as the texture property and the water-holding capacity of the low-salt minced shrimp gel all have ideal effects; the preparation method is simple, green, safe, easy to implement and suitable for industrial production; the prepared low-salt minced shrimp gel with high gel quality overcomes a series of problems of low shrimp meat content, high salt content, unsatisfactory texture characteristics, low moisture retention capacity, weak gel strength and loose structure of the existing minced shrimp products.

The invention discloses a high-strength and high-water-retention soybean meal-based adhesive and a preparation method thereof.The high-strength and high-water-retention soybean meal-based adhesive is prepared from, by weight, soybean protein meal, glucose oxidase, calcium sulfate oligomer, ethylene glycol diglycidyl ether and a dispersion medium, and the preparation method comprises the following steps that all the components are weighed according to the mass ratio; the preparation method comprises the following steps: dispersing glucose oxidase in a dispersion medium, uniformly dispersing soybean protein meal in the glucose oxidase dispersion liquid prepared in the step S1, heating for reaction, uniformly dispersing a calcium sulfate oligomer in the soybean protein meal dispersion liquid oxidized and catalyzed by the glucose oxidase prepared in the step S2, and uniformly dispersing the calcium sulfate oligomer in the soybean protein meal dispersion liquid oxidized and catalyzed by the glucose oxidase. And uniformly dispersing ethylene glycol diglycidyl ether in the dispersion liquid obtained in the step S3, and then stirring for 5 minutes. The adhesive disclosed by the invention has excellent properties in the aspects of bonding strength, water retention capacity, mildew resistance and sustainability.

The invention discloses a method for co-processing chromium-containing aluminum mud and electrolytic aluminum overhaul slag, which comprises the following steps of: oxidizing cyanide in the finely ground overhaul slag into carbon dioxide and nitrogen by using hexavalent chromium with strong oxidizing property in the chromium-containing aluminum mud under an acidic condition, and adding calcium oxide into decyanated slag to obtain trivalent chromium precipitate and insoluble villiaumite; and chloridizing the washed and dried precipitation slag by adopting aluminum chloride, carrying out multi-stage condensation separation and purification on the chloridized flue gas to respectively obtain ferric trichloride and aluminum trichloride, carrying out heat exchange and washing on the chloridized slag to obtain a chromium trichloride solution, and carrying out alkaline leaching to obtain sodium aluminate and tailings. According to the method, oxidation-reduction characteristics of the chromium-containing aluminum mud and the overhaul slag are utilized to cooperate with detoxification, a carbon-based wave-absorbing material in the overhaul slag is subjected to microwave heating for chlorination recovery of valuable elements, the heating rate is high, heating is uniform, the reaction efficiency is high, harmless treatment of the two hazardous wastes is achieved, the valuable elements such as chromium and aluminum in the hazardous wastes are effectively recovered, and the method is suitable for industrial production. And the energy utilization rate is high.

The invention discloses low-endotoxin macromolecule PDRN, a preparation method and application. A freeze-dried white powder sample is obtained through fish testis pretreatment, fish sperm cell enzymolysis, deproteinization, ultrasonic pretreatment, nuclease enzymolysis, primary alcohol precipitation, redissolution and filtration, endotoxin control, secondary alcohol precipitation, alcohol washing and freeze-drying. Fragmentation is carried out by combining ultrasonic waves with nuclease enzymolysis, the use amount of enzyme can be effectively reduced, the molecular weight of the product can be accurately controlled, operation is easy, and the industrialization cost is low. The method comprises the following steps: carrying out enzymolysis on protamine cells through protease K, releasing protamine DNA, carrying out fragmentation on a PDRN sample by using ultrasonic waves and nuclease, and carrying out deep filtration and triton 114 washing to obtain the protamine with the molecular weight controllable interval of 500bp-4000bp; the content of endotoxin is less than or equal to 0.5 EU / mg, and the content of protein is less than or equal to 1.0%. The finished product is obtained by freeze-drying the PDRN wet solid, and the quality and the additional value of the product are improved.

The invention relates to the technical field of wastewater treatment, in particular to a method for recovering copper from industrial acid wastewater. The method comprises the following specific steps: sulfur concentrate activation: grinding, acid leaching, washing and drying blocky sulfur concentrate in sequence for later use; selective recovery of copper: taking a certain amount of copper-containing industrial acidic wastewater, adding the treated sulfur concentrate into the zinc industrial acidic wastewater, and uniformly stirring to obtain mixed slurry; and solid-liquid separation is conducted, specifically, a certain amount of flocculating agent is added into the obtained mixed slurry for solid-liquid separation, and supernate and copper-containing concentrate are obtained. The copper grade in the copper-containing concentrate is not lower than 10%, and the copper-containing concentrate can be directly sold or sold after simple flotation. The method has the advantages of simple and easy process, low equipment requirement, convenience in operation, wide application range and the like, and has good social benefits and economic values.

The invention provides a kitchen garbage integrated treatment system and a control method thereof.The kitchen garbage integrated treatment system comprises a rack, a lifting and weighing device is arranged on one side of the rack, a manual sorting platform is arranged at the position, located at a pouring opening of the lifting and weighing device, of the top of the rack, and a bottom outlet of the manual sorting platform is connected with an inlet of a crushing device; an outlet of the crushing device is connected with the extruding device, a liquid outlet of the extruding device is connected with the liquid collecting device, a solid outlet of the extruding device is connected with the drying bin through the vertical lifting device, and solid materials are fed into the composting bin connected with the drying bin after reaching the preset temperature and moisture content in the drying bin; the drying bin and the composting bin are both connected with an aeration device and an exhaust device, an intelligent control system is further arranged in the system, and the intelligent control system controls all the devices to perform corresponding actions; efficient and low-energy-consumption resourceful treatment of the kitchen garbage is achieved, and the kitchen garbage is converted into high-quality organic fertilizers, soil conditioners and garden matrixes.

The utility model discloses a corn germ meal slurry adding and drying system which is characterized in that germ meal in a leaching workshop enters a vibrating screen, an oversize outlet is connected with a lower end inlet of a first elevator, and an undersize outlet is connected with a germ meal packaging unit through a small particle discharging conveyor; an outlet in the tail end of the small particle discharging conveyor is also connected with an inlet in the lower end of the first elevator, the upper end of the first elevator is connected with an inlet of the surge bin, an outlet of the surge bin and the corn steep liquor pipe are both connected with the slurry adding mixer, and a discharging port of the slurry adding mixer is connected with the standing bed; a discharging port of the standing bed is connected with an inlet of the belt conveyor through the discharging machine, an outlet of the belt conveyor is connected with the roller dryer, an outlet of the roller dryer is connected with an inlet of the tube bundle dryer, an outlet of the tube bundle dryer is connected with the cooler through the second elevator, and a discharging port of the cooler is connected with an inlet of the smashing machine. And an outlet of the crusher is connected with the pulp adding and packaging unit. The system can improve the added value of products and increase the profit of enterprises.

The invention discloses a method for obtaining high-content madecassoside from centella asiatica by using a membrane separation method, which comprises the following steps: extraction: crushing a centella asiatica raw material, and extracting by using an ethanol solution to obtain a centella asiatica extracting solution; the centella asiatica extracting solution is filtered and centrifuged, and impurities and macromolecular substances in the centella asiatica extracting solution are removed; membrane separation: carrying out ultrafiltration separation on the pretreated extracting solution through an ultrafiltration membrane, and intercepting impurities of which the molecular weight is greater than that of madecassoside, so as to obtain permeate containing madecassoside; a concentration step: concentrating the permeate through a nanofiltration membrane to obtain a concentrated solution with high content of madecassoside; and a drying step: drying the concentrated solution to obtain a solid product with high content of madecassoside. The method has the beneficial effects that impurities are effectively removed, and the purity of madecassoside is improved; the operation process is simple and easy to control, and the production cost is reduced; and high-content madecassoside can be obtained.

The invention belongs to the technical field of chemical engineering, and particularly relates to a method for preparing 5-hydroxymethylfurfural by degrading cellulose in a FePO4 / SBA-15-SO3H catalytic system, which comprises the following steps: SBA-15 preparation; the preparation method comprises the following steps: preparing a FePO4 / SBA-15-SO3H catalyst; and step 3, preparing the 5-hydroxymethylfurfural in a FePO4 / SBA-15-SO3H catalytic system. According to the method, FePO4 / SBA-15-SO3H is adopted as a catalyst system, cheap cellulose is used as a raw material to prepare the 5-hydroxymethylfurfural with a high additional value, the method has the advantages of low price and easiness in recovery, the corrosion to equipment is small, the pollution to the environment is reduced, the selectivity for generating the 5-hydroxymethylfurfural is higher, and the method is suitable for industrial production. And the yield of the 5-hydroxymethylfurfural is improved.

The invention discloses a cationic dye dyeable regenerated polyester fiber and a preparation method thereof, and relates to the technical field of polyester fibers, the cationic dye dyeable regenerated polyester fiber comprises the following components: waste polyester, sodium bis (2-hydroxyethyl) isophthalate-5-sulfonate and long-chain dihydric alcohol, the method comprises the following steps: mixing waste polyester, sodium bis (hydroxyethyl) isophthalate-5-sulfonate and long-chain dihydric alcohol according to a certain mass ratio, extruding the mixture in a twin-screw extruder, carrying out semi-depolymerization on the waste polyester by using the sodium bis (hydroxyethyl) isophthalate-5-sulfonate and the long-chain dihydric alcohol to obtain a semi-depolymerization product which is low-molecular-weight polyester with a hydroxyl-terminated structure, feeding the low-molecular-weight polyester into a polycondensation reactor, and carrying out condensation polymerization on the low-molecular-weight polyester with the hydroxyl-terminated structure to obtain the low-molecular-weight polyester with the hydroxyl-terminated structure. The prepared modified polyester can be directly spun or spun after being diced, and the prepared polyester fiber has a cationic dye normal-pressure dyeable effect, can remarkably reduce dyeing energy consumption and material consumption, has good hygroscopicity, improves wearing comfort and can be widely applied to the fields of clothes, home textiles and the like.

The invention provides a method for extracting seabuckthorn oil, and belongs to the field of oil processing. The extraction method provided by the invention comprises the following steps: soaking seabuckthorn pomace with water, then stirring evenly, then adding composite enzyme to keep warm, and centrifuging the enzymatic solution; adding 75% ethanol solution to the centrifugal precipitate for heating and reflux extraction, filtering the alcohol extract, combining the filter residue with the centrifugal solution, and then adding n-hexane for extraction, and recovering n-hexane from the extract to obtain crude seabuckthorn oil; adding activated carbon and silica gel powder to the crude seabuckthorn oil in sequence, stirring, placing, and filtering to obtain seabuckthorn oil. The seabuckthorn oil extraction method provided by the invention has a high oil yield, and the obtained seabuckthorn oil has a high content of effective ingredients, a low content of plasticizer and benzopyrene, good quality, and low equipment requirements, and is suitable for large-scale industrial production.