379 results about "Sodium nitrate" patented technology

The invention discloses a high-entropy P2-O3 composite system sodium ion positive electrode material, a preparation method thereof and a sodium battery, and belongs to a new energy material technology. The method comprises the steps that a first reactant, metal oxide and solid powder of a sodium source are blended, sintered and cooled, the component of the first reactant is NiyFezMn (1-3y-z) (OH) (2-4y), and the particle size of the first reactant is 1-20 micrometers; the metal oxide is any two of TiO2, MgO, Co3O4, SnO2, ZrO2, La2O3 and CeO2, and the particle size D50 of the metal oxide is less than or equal to 5 microns; the sodium source is selected from any one of sodium carbonate, sodium bicarbonate, sodium nitrate and sodium acetate, and the particle size D50 is less than or equal to 10 microns; the particle size of the first reactant is larger than the particle size D50 of the metal oxide, and the particle size D50 of the sodium source is larger than the particle size D50 of the metal oxide.

The present invention relates to a method for treating a bacterial infection by using Paracoccus wg1 T The invention relates to a method for treating wastewater containing high concentration of inorganic nitrogen, which belongs to the technical field of waste resource utilization and water environment treatment. T The seed liquid after culture is used to treat nitrogen-containing wastewater, and the Paracoccus wg1 of the present invention T , has a very high tolerance to high concentrations of inorganic nitrogen, and has excellent denitrification capabilities under conditions of high concentrations of inorganic nitrogen. Specifically, sodium nitrate is used as the nitrogen source, sodium propionate is used as the carbon source, NO3 ‑ When the ‑N concentration is 6258.85 mg / L‑N, 97.68 mg / L‑N of NO3 can be degraded in 48 hours ‑ -N; ammonium sulfate as nitrogen source, sodium propionate as carbon source, NH4 + When the ‑N concentration is 9326.28 mg / L‑N, 92.28 mg / L‑N of NH4 can be degraded in 48 hours + ‑N. paracoccus wg1 T Biological denitrification treatment of high-concentration inorganic nitrogen wastewater has great application prospects.

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 nano phase change heat storage material with high decomposition temperature as well as a preparation method and application thereof, and belongs to the technical field of mixed molten salt energy storage materials. The nanometer phase change heat storage material is composed of 99 wt% of low-melting-point mixed molten salt and 1 wt% of SiO2 nanometer particles. The low-melting-point mixed molten salt is composed of potassium nitrate, sodium nitrite and sodium nitrate according to the mass ratio of 53: (10-30): (17-37). The low-melting-point and high-decomposition-temperature nanometer phase change heat storage material with the melting point being 150-175 DEG C and the decomposition temperature being 660-723 DEG C is prepared by combining the mixed molten salt composed of potassium nitrate, sodium nitrite and sodium nitrate according to the specific dosage ratio with SiO2 nanoparticles, the melting point of the phase change material is low, energy consumption can be effectively reduced, and the energy consumption is reduced. And the composition has good decomposition temperature, melting latent heat and other thermophysical properties.

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 discloses a negative-electrode-free sodium ion battery, which comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the positive plate comprises a positive current collector, the surface of the positive current collector is coated with a positive active material, a positive conductive agent and a positive binder, the negative plate comprises a negative current collector, the surface of the negative current collector is coated with a carbon nanotube and polyvinylidene fluoride, the negative electrode current collector is a copper foil, the electrolyte comprises sodium salt and an organic solvent, the sodium salt is sodium nitrate, and the organic solvent comprises fluoroethylene carbonate, 1, 3-propane sultone and dimethyl sulfoxide. The negative-electrode-free sodium ion battery has the beneficial effects that the negative electrode does not use active materials and only uses CNT and PVDF, so that more positive electrode active substances can be accommodated in the battery, more electric energy can be stored under the same volume, and the energy density of the negative-electrode-free sodium ion battery is improved. No negative electrode active material is introduced, so that the cost is reduced and the manufacturing process is simplified. And meanwhile, by optimizing an electrolyte system, the growth of sodium dendrites is effectively inhibited, and the cycle life of the battery is prolonged.

The invention provides treatment equipment for ethanol and water mixed mother liquor and a sodium nitrate and potassium nitrate purification method, and relates to the technical field of waste liquid treatment, the treatment equipment comprises a flocculation box, a flocculation frame and a driving mechanism; a mounting plate is mounted at the top of the flocculation frame through bolts, the driving mechanism comprises a mounting frame mounted on the upper surface of the mounting plate, and a top plate and a bottom plate are fixedly arranged on the inner wall of the mounting frame. According to the scheme, in the overflowing and liquid discharging process, the water body in the flocculation box can be changed, flocculation groups with small sizes can turn over upwards, and the inclined plate with large initial inclination can block and capture the flocculation groups which turn over upwards, so that the flocculation groups are prevented from overflowing along with water flow through the inclined plate; meanwhile, the linkage plate can be adopted to control the multiple inclined plates to synchronously turn over in a linkage mode to change the inclination, flocculation groups captured on the inclined plates are shaken to be precipitated downwards, and it is guaranteed that overflowing and liquid discharging can be fast, so that waste liquid can be well flocculated, efficient and stable flocculation is guaranteed, and follow-up discharging or recycling is facilitated.

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 invention belongs to the field of water electrolysis hydrogen production electrode materials, and particularly relates to a local amorphous porous iridium oxide, preparation thereof and application of the local amorphous porous iridium oxide in OER catalyst.The preparation method of the local amorphous porous iridium oxide comprises the steps that a mixed raw material of an iridium source, an organic-inorganic synergistic regulator and sodium-based composite salt is subjected to roasting treatment, and the local amorphous porous iridium oxide is obtained; and then carrying out quenching treatment to obtain the local amorphous porous iridium oxide. The organic-inorganic synergistic regulator comprises a La inorganic substance and an organic substance shown as a formula 1 (# imgabs0 #) in a weight ratio of (1-10): (10-50); the sodium-based composite salt comprises sodium nitrate and sodium chloride; in the formula 1, R is H, alkyl or substituted alkyl. The material prepared by the preparation method disclosed by the invention is excellent in performance under a high-temperature condition, and can stably operate under the conditions of frequent start and stop and large current.

The invention belongs to the field of textile dyeing and finishing, and relates to a dyeing method capable of regulating and controlling in-situ assembly of dye molecules through cellulose fiber graft modification. The dyeing method comprises the following steps: soaking a cellulosic fiber textile in a 4-beta-hydroxyethylsulfonyl sulfate aniline-2-sulfonic acid aqueous solution for reaction, washing with water, drying, soaking in a hydrochloric acid aqueous solution, adding a sodium nitrite aqueous solution for reaction, adding urea, washing with water, and drying to obtain the cellulosic fiber textile. Soaking in a coupling component aqueous solution containing a coupling component, sodium hydroxide and sodium carbonate for reaction, alternately washing with hot water and cold water, and drying to obtain the dyed textile. The dyeing method is mild in condition, dye hydrolysis is avoided, the dye uptake and the dyeing fastness are improved, and the dye utilization rate is high; high temperature and a large amount of inorganic salt or auxiliaries are not needed, the dye is directly generated and fixed in the fiber, energy consumption is remarkably reduced, and waste water treatment pressure is reduced.

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 invention discloses a sodium ion battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of sodium ions. The sodium ion battery electrolyte provided by the invention comprises a sodium salt, an organic solvent, a main additive and an auxiliary additive, the main additive is one or more of sodium difluorophosphate NaDFP, sodium tetrafluoroborate NaBF4, sodium trifluoroacetate NaTFA or sodium nitrate NaNO3, and the auxiliary additive is one or more of sodium difluorophosphate NaDFP, sodium tetrafluoroborate NaBF4, sodium trifluoroacetate NaTFA or sodium nitrate NaNO3. According to the present invention, one or more of tris (trimethylsilane) borate TMSB, tris (trimethylsilane) phosphate TMSP, (pentafluorophenyl) silane TPFS or tris (trimethylsilane) phosphite TMSPi are adopted, the circulation capacity retention rate in a wide temperature range is significantly improved through the synergistic mechanism in a certain proportion range, the capacity retention rate is high at a high rate of 10 C and above, the rapid charging performance is provided, and the application prospect is broad. The cost is reduced; and commercialization is promoted.

The invention discloses a mesoporous iridium oxide catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving an iridium-containing compound, nitrate and urea in water, and uniformly stirring and mixing to obtain a mixed solution; carrying out rotary evaporation drying on the mixed solution to obtain a uniform catalyst precursor; calcining the precursor in an air atmosphere to obtain an iridium oxide catalyst; the iridium-containing compound comprises but not limited to one or more of chloroiridic acid, potassium chloroiridate and iridium trichloride, the nitrate comprises but not limited to one or more of sodium nitrate, ammonium nitrate and potassium nitrate, the molar ratio of the urea to the iridium-containing compound in the mixed solution is (1-100): 1, and the molar ratio of the nitrate to the iridium-containing compound is (1-100): 1; the mesoporous iridium oxide prepared by the invention has an ultrahigh specific surface area, is beneficial to exposure of active sites and optimization of mass transfer in a reaction process, and effectively reduces the noble metal loading capacity of a proton exchange membrane electrolyzed water anode catalyst.

The invention provides a composite heat storage material and a preparation method thereof, and relates to the technical field of phase change heat storage materials. The composite heat storage material comprises the following raw materials in percentage by mole: 10-70% of sodium hydroxide, 1-5% of potassium hydroxide, 10-60% of sodium nitrate and 10-70% of sodium nitrite. The prepared composite heat storage material has the characteristics of stable thermal cycle performance, high phase change heat storage density and the like, and is suitable for the field of medium-temperature heat storage.

The invention belongs to the field of sodium metal batteries, and particularly relates to a sodium metal battery and a high-entropy electrolyte thereof, the electrolyte comprises a high-entropy sodium salt and an ether solvent; the high-entropy sodium salt is a combined sodium salt containing more than four of a sodium salt A and a sodium salt B; wherein the sodium salt A comprises three sodium salts compounded by a formula 1 # imgabs0 # NaBH4 and NaFSI; the sodium salt B comprises at least one of sodium hexafluorophosphate, sodium bis (trifluoromethylsulfonyl) imide, sodium difluoro (oxalato) borate, sodium tetrafluoroborate, sodium nitrate, sodium bis (oxalato) borate, sodium difluorophosphate, sodium silicate and sodium perchlorate. The electrolyte provided by the invention can adapt to the characteristics of a sodium metal battery system, and can meet the application requirements of high magnification and wide temperature range.

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 relates to a method for preparing a 4-chloro-3-nitroanisole compound, in particular to a method for preparing a 4-chloro-3-nitroanisole compound by using a microreactor, which comprises the following steps: carrying out a raw material diazotization reaction by using the microreactor, then carrying out a chlorination reaction in an intermittent tank reactor, and taking 2-methoxy-4-nitroaniline as a raw material to prepare the 4-chloro-3-nitroanisole compound. The 4-chloro-3-nitroanisole compound is prepared from sodium nitrite and cuprous chloride. According to the invention, diazotization of 4-chloro-3-nitroanisole is realized on the micro-reaction device, and the method has the advantages of simple process, continuous production, small reaction volume, short reaction time, small corrosion to equipment, high operation safety and the like. Meanwhile, by utilizing the characteristics of high-efficiency heat mass transfer capacity and easiness in direct amplification of the microchannel reactor, the yield is high and is 80-85%, the product quality is good, the energy consumption is low, and the method is a green, environment-friendly and high-efficiency method for preparing the 4-chloro-3-nitroanisole and is suitable for industrial application.

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.