262 results about "Sodium nitrate" patented technology

The invention discloses a compatible molybdenum-aluminum mixed acid etching solution which comprises the following components in percentage by mass: 4%-7% of nitric acid, 55%-65% of phosphoric acid, 17%-28% of acetic acid, 0.5%-3% of an oxidizing additive, 0.05%-5% of a metal corrosion inhibitor and 10%-20% of deionized water, and the oxidizing additive is ceric nitrate and at least one selected from sodium nitrate, potassium nitrate and ammonium nitrate; the etching liquid does not contain other organic components except for organic carboxylic acid and organic carboxylate. According to the compatible molybdenum-aluminum mixed acid etching solution, on the basis that ceric nitrate is introduced, the content of nitric acid is reduced, the nitrate ion concentration is increased by adding nitrate, the overall oxidation performance of an etching solution system is improved, the etching rate ratio of different metals is adjusted, CD-Bias is reduced, the etching dip angles of a molybdenum single layer and a molybdenum-aluminum laminated layer are controlled to be kept at 20-50 degrees, and the problem of aluminum thorns is solved. The invention further discloses a molybdenum-aluminum etching method based on the compatible molybdenum-aluminum mixed acid etching solution.

The invention discloses a synthesis method of 2, 4, 5-trifluorophenylacetic acid, which comprises the following steps: by taking cheap and easily available o-chloronitrobenzene as a raw material, reacting with sodium nitrate in a sulfuric acid and trifluoroacetic acid system, separating generated 2, 4-dinitrochlorobenzene through melt crystallization, and continuing to synthesize 2, 4-dinitrochlorobenzene in methyl chloroacetate to obtain 2, 4, 5-trifluorophenylacetic acid. The method comprises the following steps: carrying out indirect aromatic nucleophilic substitution reaction on 2, 4-dinitrophenylacetic acid under the condition of sodium hydride to generate 5-chloro-2, 4-dinitrophenylacetic acid methyl ester, separating, carrying out fluorination reaction on the 5-chloro-2, 4-dinitrophenylacetic acid methyl ester and potassium fluoride under the action of a phase transfer catalyst, carrying out rectification separation to obtain 2, 4, 5-trifluorophenylacetic acid, and carrying out hydrolytic acidification on the 2, 4, 5-trifluorophenylacetic acid in a sodium hydroxide aqueous solution to obtain 2, 4, 5-trifluorophenylacetic acid. And the process route is safer, more environment-friendly, more efficient and lower in cost.

The application relates to a method for one-step synthesis of strong magnetic hydrophobic Fe3O4 nanoparticles at low temperature and the Fe3O4 nanoparticles and application, and belongs to the technical field of nano material preparation. The method comprises the following steps: adding a ferrous sulfate solution into a mixed solution of sodium hydroxide and sodium nitrate, heating and stirring to react, adding oleic acid in the reaction process, and obtaining black Fe3O4 crystals after the reaction is completed. The saturation magnetization of the obtained strong magnetic hydrophobic Fe3O4 nanoparticles can reach 85.69 emu / g at most, and the water contact angle can reach 148.95 DEG. The one-step synthesis reaction only needs to use oleic acid as a regulator, avoids an extreme high-temperature and high-pressure environment, does not need to use a toxic chemical solvent, the condition is mild, the process is simple, the operation condition is easy to control, and the method has a wide application prospect.

The invention relates to the technical field of overhead conductors, and provides a high-conductivity overhead conductor which sequentially comprises a reinforcing core, an inner aluminum wire layer and an outer aluminum wire layer from inside to outside, each of the inner aluminum wire layer and the outer aluminum wire layer is formed by twisting a plurality of aluminum wires, and the reinforcing core is formed by twisting a plurality of galvanized steel wires; the preparation method of the reinforced core comprises the following steps that a steel wire is sequentially subjected to alkali washing, acid pickling, plating assisting, hot-dip galvanizing, passivation and twisting to obtain the reinforced core; during passivation, a passivation solution is prepared from, by weight, 20-25 parts of waterborne polyurethane, 15-20 parts of sodium silicate, 4-8 parts of sodium nitrate, 5-10 parts of modified graphene oxide, 3-5 parts of polyethylene glycol, 0.2-0.4 part of glacial acetic acid and 70-80 parts of water, and the modified graphene oxide is prepared from graphene oxide, a silane coupling agent and 3-aminopyrazine-2-carboxylic acid methyl ester. The problem of poor corrosion resistance of the overhead conductor in the prior art is solved.

The invention provides an iridium-ruthenium oxide composite catalyst, a preparation method thereof and a proton exchange membrane water electrolysis device, and relates to the field of hydrogen production through water electrolysis. The preparation method of the iridium-ruthenium oxide composite catalyst comprises the following steps: mixing sodium nitrate, ruthenium chloride and water to prepare a mixed solution, and then drying and grinding to obtain a mixture; placing the mixture on the surface of nickel foil, carrying out first heating by using Joule heating equipment, and then cooling to obtain ruthenium oxide; mixing ruthenium oxide, hexadecyl trimethyl ammonium bromide and ethylene glycol, and performing ultrasonic dispersion to obtain a ruthenium oxide solution; and mixing the ruthenium oxide solution, H2IrCl6 and potassium hydroxide, adjusting the pH value of the system to be alkaline, then carrying out second heating until reflux and constant-temperature reaction, carrying out solid-liquid separation on the reaction product, and washing to obtain the iridium-ruthenium oxide composite catalyst. The iridium-ruthenium oxide composite catalyst provided by the invention has high activity, high stability and high water electrolysis efficiency.

The utility model discloses a coal chemical industry wastewater crystal salt resource recycling system which comprises a pretreatment softening device, a waste water recycling device and a waste water recycling device, an evaporation concentration device; a first evaporative crystallization system; a first freezing crystallization device; a second evaporative crystallization system; and a second freezing crystallization device. According to different properties of sodium sulfate, sodium chloride and sodium nitrate, the sodium sulfate, the sodium chloride and the sodium nitrate are crystallized and separated through the pretreatment softening device, the evaporation concentration device, the first evaporation crystallization system, the first freezing crystallization device, the second evaporation crystallization system and the second freezing crystallization device, so that the obtained sodium sulfate, the sodium chloride and the sodium nitrate reach industrial recycling standards; therefore, zero discharge and resource utilization of the wastewater are realized.

The application belongs to the technical field of metallurgy, and relates to a method for efficiently purifying and directionally removing oxygen and impurities from a precious antimony alloy, which comprises the following steps: S1, after the precious antimony alloy is melted, an arsenic-tellurium removal agent is added, and smelting is performed at 600-610 DEG C to obtain a pre-impurity removal alloy melt and an arsenic-tellurium residue; the arsenic-tellurium removal agent is a mixture of sodium hydroxide and sodium nitrate; S2, the pre-impurity removal alloy melt obtained in step S1 is heated to 620-640 DEG C, a reducing agent is added, and smelting is performed to obtain an arsenic alkali residue and a refined antimony alloy; the reducing agent is a mixture of antimony sulfide and sodium hydroxide; S3, the arsenic-tellurium residue obtained in step S1 and the arsenic alkali residue obtained in step S2 are ball milled, leaching and filtration are performed to obtain a filtrate and a filter residue; S4, the filtrate obtained in step S3 is mixed with sulfuric acid, and after reaction, a neutralization residue and a neutralization liquid are obtained. By introducing the efficient arsenic-tellurium removal agent and the reducing agent, the content of antimony in the arsenic alkali residue is significantly reduced, and the direct recovery rate of antimony and the recovery rate of tellurium are effectively improved.

The preparation method comprises the following steps: taking 280 to 330 parts of cement, 55 to 70 parts of mineral powder, 28 to 32 parts of fly ash, 760 to 800 parts of sand, 960 to 1050 parts of stone, 130 to 150 parts of water, 4 to 5 parts of a water reducing agent and 30 to 40 parts of modified expanded fly ash microspheres, and uniformly mixing, so as to obtain the environment-friendly concrete. The modified expanded fly ash microspheres are prepared by the following steps: uniformly mixing fly ash, water and a foaming agent, carrying out high-speed centrifugal rotary spraying treatment to obtain fly ash microspheres, carrying out dehydration expansion on the fly ash microspheres in an electric furnace, and melting the fly ash microspheres into balls to obtain the modified expanded fly ash microspheres, and the foaming agent is selected from sodium monohydrogen carbonate, sodium nitrate or calcium carbonate. According to the invention, the heat conductivity coefficient of the concrete is reduced from the initial about to about about, the compressive strength of the concrete in 28 days is increased from the initial about 40 MPa to about 60 MPa, and the bleeding rate is reduced from the initial 20% to the final about 5%, so that the concrete achieves the best heat preservation effect and has the highest strength.

The invention provides an electrochemical selective extraction process and device, and relates to the technical field of material extraction in the nuclear fuel circulation process, and the electrochemical selective extraction process comprises the following steps: respectively carrying out corrosion potential tests on an uncontaminated stainless steel sample and a stainless steel sample contaminated with nuclide; obtaining the corrosion potential a of the uncontaminated sample relative to the cathode and the corrosion potential b of the contaminated nuclide sample relative to the cathode; putting a to-be-treated metal workpiece of which the surface is adhered with a pollutant material into an anode basket of an electrochemical extraction device, and connecting the anode basket to an anode of a direct-current power supply or a potentiostat; mixing nitric acid, sodium nitrate, a corrosion inhibitor and a slow release agent to prepare an electrolyte; a cathode basket of the extraction device is connected with a negative electrode of a direct-current power supply or a potentiostat, an anode basket is nested in the cathode basket, and the anode basket and the cathode basket are jointly immersed in electrolyte for extraction. According to the method, pollutants adhering to the irregular metal surface are effectively removed and recycled, the extraction rate of contaminated metal nuclides reaches 99% or above, and the introduction amount of matrix elements is lower than 3500 ppm / g matrix.

The application discloses a preparation method and application of a zirconium dioxide loaded iridium oxide nanocluster oxygen evolution electrocatalyst. A mixed solution of zirconium salt, amide solvent and organic acid is prepared, and the mixed solution is kept at 120 DEG C for 24 hours; after cooling, the white product is separated, washed and dried. Then, the product and iridium salt are dispersed in a mixed solution of tetrahydrofuran and water, and sodium nitrate and potassium nitrate aqueous solution are added under stirring; after stirring, rotary evaporation is carried out at 60 DEG C, and the greenish powder obtained after drying is vacuum dried at 60 DEG C for 12 hours; the greenish powder is kept in a muffle furnace at 450 DEG C for 30 minutes, and then cooled in air; the greenish powder is washed with deionized water and anhydrous ethanol for multiple times, and finally vacuum dried at 60 DEG C for 12 hours. The zirconium dioxide loaded iridium oxide material based on oxygen overflow stable tetragonal zirconia can be specially applied to an electrocatalyst for an oxygen evolution reaction in an acidic electrolyte, has excellent oxygen evolution reaction activity, follows a lattice oxygen mechanism in the reaction process, and can realize an oxygen overflow effect from tetragonal zirconia to iridium oxide nanoclusters to stabilize the catalyst.

Method for producing a shatter-resistant membrane glass (2) of a glass component of a measuring half-cell (1) of an analyte-sensitive sensor, comprising: - providing at least one membrane glass (2) of a sensor blown onto a shaft (3), which consists of a sodium- and lithium-containing glass, preferably sodium- and lithium silicate glass, or of a lithium-containing glass, preferably lithium silicate glass, or comprises one of these materials; - bringing the at least one membrane glass (2) blown onto a shaft (3) into contact with a pickling solution containing sodium ions, preferably a sodium acetate or sodium nitrate solution or a melt containing sodium ions; - heating the membrane glass (2) at a temperature of 200°C-500°C, preferably 300-450°C, more preferably 400-450°C for 10-20 minutes, wherein the membrane glass (2) is ion-sensitive.

The invention discloses a resourceful treatment system and method for wastewater with high organic matter content and high sodium nitrate content. The system comprises a wastewater pretreatment system, a nanofiltration unit, a sodium chloride evaporation unit, a sodium nitrate evaporation and crystallization unit, a sodium sulfate evaporation unit, a wet catalytic oxidation device, a mixed salt evaporation unit and a carnallite drying unit. The method comprises the following steps: (1) sodium nitrate crystallization; (2) crystallizing sodium sulfate; (3) catalytic oxidation; and (4) mixed salt crystallization. The system has the advantages that the system is simple in connection structure and easy to realize, sodium nitrate crystal salt is not produced in the rear-end mixed salt evaporation process, and meanwhile, the part of sodium nitrate has relatively high economic benefits; according to the method, the concentration multiple of mixed salt evaporation is increased, and the amount of dried carnallite is reduced, so that the carnallite treatment cost is reduced.

The invention discloses a colorless medium borosilicate medicinal glass tube and a preparation method thereof, and belongs to the technical field of glass products. The medicinal glass tube comprises the following raw materials in parts by weight: 550-650 parts of quartz sand, 60-70 parts of aluminum hydroxide, 100-250 parts of borax pentahydrate, 5-15 parts of sodium nitrate, 15-30 parts of sodium carbonate, 1-5 parts of sodium fluosilicate, 10-15 parts of calcite, 5-10 parts of barium carbonate, 5-10 parts of potassium carbonate, 10-20 parts of a compound clarifying agent and 400-500 parts of medium borosilicate glass slag. The quartz sand and the borax pentahydrate in a high proportion provide a basis for the high borosilicate glass, the chemical stability of the glass is remarkably improved, the glass can resist acid and alkali erosion and is very suitable for storing various medicines, and in addition, substances such as aluminum hydroxide, calcite, sodium nitrate, sodium carbonate and sodium fluosilicate are added, so that the thermal stability and the mechanical property of a glass product are improved.

The present application provides a composition and a fracturing fluid containing the same. The composition provided by the present application comprises ammonium chloride, sodium nitrite and a flow enhancer. The flow enhancer is a chemical loading product of a compound shown in a structural diagram as Formula I on nano-silicon dioxide; wherein A is an optionally substituted naphthalene ring; n is an integer from 1 to 10; n R is independently selected from one of a chemical single bond and a C1 to C 10 alkylene group; and n X is independently selected from -O- or -NH-, and at least one X is -NH-. The fracturing fluid comprises the composition, a thickening agent, a clay stabilizer, a cleanup agent, a crosslinking agent, a pH regulator and water.

This invention relates to the field of laser processing technology and discloses a laser cutting process and apparatus for thick-walled tubes combined with electrochemical jet slag removal. The process includes: an automatic buffer material feeding and recovery mechanism pushes a high-temperature resistant ceramic-based inner liner tube into the inner cavity of a thick-walled tube as a buffer material for laser cutting; after cutting, the buffer material is removed, a physical sliding isolation sealing door is closed in conjunction with a flexible clearance pad, and a positive pressure air curtain blowing device is activated to seal the processing area; the thick-walled tube is connected to the anode of a power source, and the inner and outer jet nozzles are connected to the cathode, spraying high-pressure sodium nitrate passivation electrolyte into the residual slag area. The slag removal mechanism, which combines physical shielding at the slag source with electrochemical anodic dissolution and high-pressure liquid flow flushing, eliminates the contact stress caused by mechanical hard cutting and avoids the problem of micro-cracks at the tube wall wear ports; a spatial isolation protection mechanism prevents salt spray from eroding the optical lenses of the fiber laser cutting head and the machine tool transmission guide, completing a non-destructive slag removal operation.

The invention discloses a tetrazine probe synthon and a preparation method and application thereof.The preparation method comprises the following steps that under the inert atmosphere, diethyl cyanomethylphosphonate, 3-hydroxypropionitrile, 3-mercaptopropionic acid and hydrazine hydrate are mixed and then react at the room temperature, a sodium nitrite solution is added after the reaction is finished, then acid is continuously added till the reaction system reaches acidity, and a tetrazine probe synthon product is obtained; continuously reacting to obtain an intermediate; and dissolving the intermediate in a solvent in an inert atmosphere, adding triethylamine, slowly adding methanesulfonyl chloride, and reacting at room temperature to obtain the tetrazine probe synthon shown in the formula I. The invention further discloses a preparation method of the tetrazine probe synthon. The tetrazine probe synthon provided by the invention can perform series Heck reaction and HWE reaction, so that controllable combination of functional groups on two sides of a tetrazine coupling probe is realized under mild reaction conditions, and the functional groups on two sides are designed according to actual requirements to regulate and control photophysical properties of the probe. A brand new way is provided for developing a high-performance biological orthogonal fluorescent probe.

The invention belongs to the technical field of acyclic compounds, and particularly relates to a preparation method of tert-butyl peroxymaleate. Adding a tert-butyl hydroperoxide aqueous solution into deionized water, mixing, stirring and cooling to obtain a mixed solution; under a stirring condition, sequentially adding liquid caustic soda and sodium nitrate into the mixed solution, and continuing to stir and react after the liquid caustic soda and the sodium nitrate are added to obtain a reaction solution I; under the stirring condition, maleic anhydride is added into the reaction liquid I, stirring reaction continues after adding is completed, and reaction liquid II is obtained; under the stirring condition, acid is added into the reaction liquid II, stirring reaction continues after adding is completed, and reaction liquid III is obtained; adding deionized water into the reaction liquid III for washing, and performing suction filtration to obtain a tert-butyl peroxymaleate crude product; and washing and drying the tert-butyl peroxymaleate crude product to obtain the tert-butyl peroxymaleate. No organic solvent is added, the method is environmentally friendly, the cost is saved, and meanwhile the product yield can be increased to 93% or above.

The invention relates to the technical field of new energy and mining and blasting, in particular to a preparation method of a biomass instantaneous cracking agent. The preparation method comprises the following steps: mixing biomass powder, pulverized coal, an oxidant, a catalyst and a release agent to obtain mixed powder; mixing the adhesive, the water and the preservative to prepare a glue solution; the glue solution and the mixed powder are kneaded, granulated and dried, and the biomass instantaneous cracking agent is obtained, the biomass powder accounts for 4-55 parts by mass, the pulverized coal accounts for 0-48 parts by mass, the oxidizing agent accounts for 0-45 parts by mass, the catalyst accounts for 0-20 parts by mass, the release agent accounts for 0-2.5 parts by mass, the adhesive accounts for 2-10 parts by mass, the preservative accounts for 0-0.15 part by mass, and the oxidizing agent and the catalyst are not 0 at the same time; the oxidizing agent is potassium peraluminate powder and / or ammonium perchlorate powder; the catalyst is potassium nitrate powder and / or sodium nitrate powder. The biomass instantaneous cracking agent prepared by the invention solves the problems of long stone cracking time, low efficiency and environmental pollution of the existing stone cracking agent.

This invention discloses a method for preparing high-elongation bars for cold forging, belonging to the field of aluminum alloy preparation technology. Through optimization of composition and process, the prepared bars possess high purity, uniform and fine equiaxed grain structure, and excellent plasticity, with significantly improved elongation. This meets the stringent requirements of cold forging for high material plasticity, resulting in a bright, crack-free surface and uniform grains after cold forging, overcoming problems such as oxide scale, coarse grains, and poor dimensional accuracy caused by hot forging. Furthermore, the introduction of modified talc and sodium nitrate as refining agents further promotes uniform microstructure, achieving high elongation and excellent cold forging performance.

The invention belongs to the technical field of nitrogen oxide treatment, and particularly relates to a tail gas treatment catalytic reactor for sodium nitrate production, which comprises a tank body, an upper gas distribution plate and a lower gas distribution plate are fixedly connected in the tank body, a partition plate is fixed between the upper gas distribution plate and the lower gas distribution plate, and catalyst reaction layers and cleaning assemblies are arranged on two sides of the partition plate. The catalyst reaction layer is fixed to the partition plate, a washing assembly is further arranged in the tank body, the washing assembly is used for scrubbing the two faces of the catalyst reaction layer, and the washing assembly is used for washing the two faces of the catalyst reaction layer. Through cooperative work of the cleaning assembly and the flushing assembly, a brush of the cleaning assembly can mechanically brush the two faces of the catalyst reaction layer, a spray head of the flushing assembly can synchronously or independently flush the two faces of the catalyst reaction layer, all-directional cleaning of the catalyst reaction layer is achieved, impurities attached to the surface are effectively removed, and the service life of the catalyst reaction layer is prolonged. The high catalytic efficiency of the catalyst is maintained.

The invention discloses a water purifying agent for phosphating wastewater treatment and a preparation method thereof, and relates to the technical field of water purifying agents, the preparation method comprises the following steps: dissolving Zn (NO3) 2.6 H2O in deionized water, and uniformly mixing to obtain a solution A; dissolving Na2CO3 in deionized water, uniformly mixing to obtain a solution B, pouring the solution B into the solution A, and stirring to form a turbid liquid; sealing and standing the turbid liquid for at least 5 days, then separating the precipitate, washing the precipitate, and then washing and drying to obtain a zinc oxide precursor; calcining the zinc oxide precursor, and grinding to obtain zinc oxide powder; the preparation method comprises the following steps: dissolving zinc oxide powder and Al (NO3) 3.9 H2O in a sodium nitrate solution according to a molar ratio of 1: 1, adding a NaOH solution, continuously stirring until the pH value is 9-10, continuously stirring for 90-120 minutes, centrifuging, washing, and carrying out vacuum freeze-drying to obtain the water purifying agent with high specific surface area, rich pore structures and a large number of exposed active sites.

The application discloses a preparation method of a microcrystalline glass binder for a semiconductor wafer thinning grinding wheel, which comprises the following steps: obtaining a plurality of raw materials of the microcrystalline glass binder, including ethyl orthosilicate, pseudo-boehmite, lithium hydroxide sol, boric acid, sodium nitrate, potassium nitrate, chromium hydroxide sol and butyl titanate; mixing the plurality of raw materials in a first solvent and sufficiently hydrolyzing to obtain a homogeneous precursor solution; then adding a PH adjusting substance, a non-polar solvent, lithium hydroxide sol and chromium hydroxide sol in sequence to obtain a homogeneous sol system; adding boric acid powder, sodium nitrate powder and potassium nitrate powder into the homogeneous sol system and performing heating and stirring to obtain a homogeneous mixed sol; performing aging and drying on the homogeneous mixed sol to obtain a mixed gel; and performing dry ball milling and wet ball milling on the mixed gel to obtain a microcrystalline glass binder powder. The microcrystalline glass binder prepared according to the application has a relatively low softening temperature and has relatively high strength and wettability.

This invention discloses a culture medium for manganese-oxidizing bacteria suitable for low-carbon source environments in water supply networks and its application. The culture medium is prepared by mixing ferric ammonium citrate, manganese sulfate, ammonium sulfate, sodium chloride, magnesium sulfate, dipotassium hydrogen phosphate, and sodium nitrate, followed by high-temperature and high-pressure sterilization to obtain a culture solution. Manganese sulfate is added to the culture solution to obtain the manganese-oxidizing bacteria culture medium. Manganese-oxidizing bacteria are screened using this culture medium. Cast iron pipe scale is subcultured in the medium to enrich the manganese-oxidizing bacteria culture solution. The enriched manganese-oxidizing bacteria culture solution is diluted and spread onto agar solid medium, and incubated at a constant temperature to obtain manganese-oxidizing bacteria colonies. This invention solves the problem of altered bacterial physiological metabolism caused by high concentrations of added manganese ions, effectively improving bacterial activity and manganese oxidation capacity.

The application provides a method for preparing carbon nitride-carbonate bismuth oxide composite nanosheets by a molten salt one-pot method, sodium bismuthate, melamine and sodium nitrate are mixed and uniformly ground to obtain a solid mixture; the solid mixture is heated at 350 DEG C, sodium nitrate is molten to form an ionic molten salt medium, and a one-pot reaction is simultaneously carried out in the medium: sodium bismuthate and melamine are converted into carbonate bismuth oxide through an oxidation-reduction reaction, melamine is simultaneously converted into graphite phase carbon nitride through a polymerization reaction, and the synergistically generated carbonate bismuth oxide and graphite phase carbon nitride are in-situ compounded to form g-C3N4-Bi2O2CO3 composite nanosheets. The application is based on a synthesis strategy of realizing multiple chemical reactions in a single molten salt environment, in-situ compounding to form a heterojunction, and simultaneously generating g-C3N4 and Bi2O2CO3 in one step and in-situ bonding, and the preparation steps are simple, the operation is convenient, the reaction conditions are mild, and the method is suitable for industrial production.

The invention relates to the technical field of catalyst treatment, in particular to a Raney nickel catalyst reduction and passivation treatment system and a passivation method.The system comprises a deactivation pool, a hydrogenation reactor and a circulation pipeline which are connected in a closed loop mode; a sodium nitrate solution supply end, a temperature adjusting system and a multi-dimensional sensing assembly (a concentration sensor, a temperature sensor, a pH sensor, a pressure sensor, a flow sensor and the like) are arranged, and the core is a processing unit integrating a control module and a dynamic soft measurement model. The desalted water injection amount, the sodium nitrate solution concentration and the deactivation solution temperature are preset and dynamically optimized through the treatment unit, closed-loop circulation of a reaction system is achieved through a circulation pipeline, and the passivation process is judged based on the pH value change. According to the method, the passivation rate and the completion time are predicted by means of the dynamic soft measurement model, the optimal process parameters are output in a self-adaptive mode, and the problems that a traditional passivation method depends on artificial experience, and is low in safety and insufficient in efficiency are solved by combining a safety interlocking mechanism and a uniform mixing regulation and control strategy.

The invention discloses a waste graphite material recovery method, which comprises: 1, mixing concentrated sulfuric acid and sodium nitrate under a first reaction condition, uniformly stirring, sequentially adding a waste graphite material and potassium permanganate, and uniformly stirring to obtain a solution A; 2, stirring and diluting the solution A under a second reaction condition, a first reaction condition and a third reaction condition in sequence, and adding peroxide to obtain a solution B; 3, stirring the solution B under a first reaction condition, performing suction filtration, and sequentially performing acid pickling and drying on filter residues to obtain a graphene oxide material; and 4, heating the graphene oxide material in inert gas, and cooling to room temperature to obtain the recycled reproduced graphene. Compared with the prior art, according to the recycling method, the improved Hummers method is adopted for recycling the waste graphite material, impurities are removed, the prepared graphene oxide has larger interlayer spacing and richer oxygen-containing functional groups, meanwhile, efficient recycling of resources is achieved, the regenerated graphene can be used as a battery conductive agent, and the resource utilization efficiency is remarkably improved.

The utility model discloses a device for producing industrial ammonium nitrate and porous ammonium nitrate, belongs to the field of chemical treatment, solves the problem that an existing chemical production device cannot process different materials, and comprises a pretreatment assembly, a granulation part, a screening mechanism and an evaporation assembly, the pretreatment assembly is used for collecting and conveying an industrial ammonium nitrate solution and a porous ammonium nitrate solution, the industrial ammonium nitrate and the porous sodium nitrate can be efficiently and stably processed by arranging the pretreatment assembly, the granulation piece, the screening mechanism and the evaporation assembly, processing of the two solutions can be stably switched and changed, and the processing efficiency is improved. When two solutions are processed, all parts in the device need to be cleaned in advance, the situation that the two solutions pollute each other during processing is prevented, and therefore the stability of the whole device during operation is guaranteed, the processing cost during processing of the two solutions is reduced, and the working quality of the device is improved.

The invention belongs to the technical field of organic synthesis, and discloses ketoxime ether as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a ketoxime compound, tert-butyl alcohol and alkali to obtain a mixed solution; and adding a methylation reagent into the mixed solution, and reacting to obtain ketoxime ether. The preparation method is low in raw material cost and simple in process operation; tert-butyl alcohol is used as a solvent, sodium tert-butoxide is used as an alkali source, no water participates in the reaction process, ketoxime hydrolysis is effectively reduced, side reactions are greatly reduced, the yield of the obtained product is high, and subsequent separation and solvent recycling are facilitated; use of toxic substances such as sulfur dioxide and sodium nitrite is avoided, and emission of toxic gases such as nitrogen oxides is reduced; and the process safety risk is reduced, and the method is safe, reliable, simple and feasible.

This invention provides a method for preparing sodium nitrite, belonging to the field of chemical technology. The method includes the following steps: S1, guiding the slurry from the bottom of the thickener of a crystallizer to a primary vertical centrifuge for centrifugation and dehydration, obtaining sodium nitrite solid crystals and sodium nitrite crystallization mother liquor; S2, introducing the sodium nitrite solid crystals into a washing tank, adding soft water and saturated sodium nitrite reflux liquid, and mixing thoroughly under the action of a stirrer; the washed sodium nitrite solid crystals are then transferred to a secondary vertical centrifuge for centrifugation and dehydration, yielding high-quality sodium nitrite and sodium nitrite filtrate. Most of the saturated sodium nitrite overflowing from the secondary centrifuge returns to the washing tank to adjust the solid content entering the secondary vertical centrifuge; a small portion of the overflow overflows to a filtrate tank equipped with a stirrer, and the filtrate is pumped into the original mother liquor pipeline via a discharge pump. This invention's method for preparing sodium nitrite yields high-quality sodium nitrite with a high yield.