26 results about "Phosphorus pentoxide" patented technology

This invention belongs to the field of high-performance materials and discloses a method for preparing a controllable PBO polymer. The steps are as follows: phosphorus pentoxide is dissolved in polyphosphoric acid to obtain high-concentration polyphosphoric acid; in reactor A, DAR and small-particle-size TPA are subjected to initial prepolymerization in the high-concentration polyphosphoric acid; the above materials are transported to reactor B, and large-particle-size TPA is added for secondary prepolymerization; final polymerization is carried out in a twin-screw extruder, and by adding an appropriate amount of DAR, a PBO polymer with controllable degree of polymerization is obtained; the PBO polymer is precipitated in water and dried to obtain the PBO polymer. This method first adds phosphorus pentoxide to polyphosphoric acid to prepare high-concentration polyphosphoric acid, avoiding the problems of poor powder dispersion, exothermic dissolution, and excessively high temperature that occur when adding phosphorus pentoxide during the polymerization reaction. Furthermore, by adding DAR monomer in the extruder to control the degree of polymerization of PBO macromolecules, the degree of polymerization is controllable, which has high practical value.

This invention discloses a bioactive glass and its preparation method, belonging to the field of bioactive glass technology. It aims to solve the problems of insufficient synergistic effect between antibacterial efficacy and bone-promoting activity in existing materials, as well as the inability to monitor in vivo degradation processes in real time. The bioactive glass comprises 44-48 parts silica; 22-27 parts calcium oxide; 22-27 parts sodium oxide; 5-7 parts phosphorus pentoxide; 2-4 parts europium zinc complex; 10-20 parts chitosan; 1-5 parts lidocaine; and 2-5 parts dilute acetic acid solution. The addition of the europium zinc complex promotes bone formation and enhances antibacterial activity, achieving a highly efficient synergy between anti-infection and tissue regeneration. Simultaneously, it provides optical tracking capabilities, allowing for non-destructive real-time monitoring of the material's degradation behavior and tissue integration in vivo via fluorescence imaging. This invention offers superior material performance and a simple preparation process, providing an innovative solution for the repair of infected bone defects.

The application relates to the technical field of fine chemicals, in particular to a biomimetic amphoteric surfactant as well as a preparation method and application thereof; the preparation method of the biomimetic amphoteric surfactant comprises the following steps: reacting a fatty amine polyoxyethylene ether with a halogenated hydrocarbon to obtain a benzyl quaternary ammonium salt intermediate; cooling the benzyl quaternary ammonium salt intermediate, then adding phosphorus pentoxide to react; after the addition is completed, water is added, the reaction is continuously carried out, and the biomimetic amphoteric surfactant is obtained; the biomimetic amphoteric surfactant simultaneously integrates three characteristics of phosphate anion, polyether non-ion and benzyl quaternary ammonium salt cation, effectively solves the industry problem that traditional phosphates and cationic settling agents are incompatible, and is applied to metal processing fluid, can realize stable compounding with cationic settling agents while retaining excellent extreme pressure lubricity and hard water resistance, and can replace traditional extreme pressure agents such as environmentally-unfriendly chlorinated paraffin.

The application discloses a preparation method and system of sodium difluorophosphate. The preparation method of sodium difluorophosphate comprises the following steps: S100, in a water-free or low-water environment, a solid-phase reaction is generated between diphosphorus pentoxide and ammonium fluoride to obtain an ammonium difluorophosphate intermediate, and volatile substances generated in the reaction process are removed and recovered; S200, in a water-free organic solvent, the ammonium difluorophosphate intermediate obtained in the step S100 is reacted with a sodium salt to obtain sodium difluorophosphate. The preparation method of sodium difluorophosphate provided by the application uses diphosphorus pentoxide and ammonium fluoride as reaction raw materials to obtain an ammonium difluorophosphate intermediate, and then reacts to obtain sodium difluorophosphate. The obtained sodium difluorophosphate has high purity and few impurities. The preparation method of sodium difluorophosphate has the advantages of cheap and easily obtained raw materials, stable chemical properties, few by-products generated in the reaction, and easy recovery, and is a green and safe preparation method of sodium difluorophosphate.

This invention relates to a composite catalyst, its preparation method, and its application. The preparation method of the composite catalyst includes the following steps: S1: providing a composite support containing zirconium oxide and oxides of non-metallic elements; S2: doping the composite support with gadolinium to obtain a composite doped support; S3: doping the composite doped support with yttrium and other metallic elements; wherein the oxides of the non-metallic elements include one or more of silicon dioxide, boron trioxide, and phosphorus pentoxide; and the other metallic elements include one, two, or three of holmium, erbium, and thulium. The composite catalyst prepared according to one embodiment of this invention can be used in the urea hydrolysis reaction, enabling the urea hydrolysis reaction to proceed at a relatively low temperature, and the catalyst exhibits a high high-temperature activity retention rate.

The present application relates to the technical field of polymer preparation, and provides a polybenzimidazole and a preparation method and application thereof.The present application forms a mixed solvent system by compounding PPA and MSA, improves the viscosity problem of a traditional single solvent system by the synergistic effect of a phosphorus pentoxide cosolvent, improves the solubility and mass transfer efficiency of the reaction system to diamine and diacid monomers, and lays a foundation for the full performance of polycondensation reaction; the mixed solvent system formed by compounding PPA and MSA not only solves the inherent defects of the pure PPA system, such as high viscosity, high reaction temperature and limited monomer diffusion, but also makes up for the short board of the pure MSA system, such as insufficient catalytic activity, realizes the synergistic balance of catalytic activity and mass transfer efficiency, completes the polycondensation under relatively low temperature conditions, significantly reduces the process energy consumption, greatly improves the product molecular weight and batch consistency, and the obtained polybenzimidazole can be used in the fields of proton exchange membranes, diaphragms and the like.

This invention discloses a highly efficient method for synthesizing proxalutamide intermediates, belonging to the field of pharmaceutical synthesis technology. First, dimethyl malonate and 2-chloro-5-nitropyridine are used as raw materials, condensed in the presence of potassium carbonate to generate dimethyl 2-(5-nitropyridine-2-yl)malonate. This is then reacted with tert-butyl acrylate and acid-hydrolyzed to obtain 4-(5-nitropyridine-2-yl)butyric acid. After activation with N,N'-carbonyl diimidazole, it is coupled with aminoacetaldehyde dimethyl acetal to form N-(2,2-dimethoxyethyl)-4-(5-nitropyridine-2-yl)butyramide. Then, a cyclization reaction mediated by phosphorus pentoxide and methanesulfonic acid is used to generate crude 2-(3-(5-nitropyridine-2-yl)propyl)oxazole. After purification, the nitro group is reduced by catalytic hydrogenation, and finally, it reacts with 1,5-naphthalenedisulfonic acid to form a salt, yielding the proxalutamide intermediate. This method achieves highly efficient synthesis of proxalutamide intermediates.

Provided are: a perovskite solar cell excellent in durability; a liquid composition suitably used for forming a photoelectric conversion layer in manufacturing of the perovskite solar cell; and a method for manufacturing the perovskite solar cell using the liquid composition. A perovskite solar cell (1) comprises, in the given order, the following: a first electrode layer (20), a hole transport layer (30), a photoelectric conversion layer (40), an electron transport layer (50), and a second electrode layer (60). Contained between the first electrode layer (20) and the second electrode layer (60) is: at least one compound selected from the group consisting of ascorbic acid compounds, phenolic compounds, and unsaturated compounds; at least one oxygen atom-containing compound selected from succinic acid compounds and phosphorus compounds; or diphosphorus pentoxide.

The present application relates to big data analysis technical field, specifically to a kind of mineral fertilizer production quality control method based on big data, comprising the following steps: reading phosphorus ore diphosphorus pentoxide content and potassium ore impurity calcium magnesium content, generating incoming material quality correlation coefficient set, the numerical values in the incoming material quality correlation coefficient set are weighted combination mapping, and incoming material comprehensive characteristic parameter matrix is generated.The present application introduces finished product granulation pulverization rate, acid-base neutralization consumption determination value into the inversion process of significant dynamic threshold, so that front-end raw material fluctuation and middle section operation fluctuation can accept the reverse check of end quality boundary, thereby obtaining stronger quality causal through capability, abnormal positioning capability and interception specificity, which can not only compress the path length of raw material difference transmission to finished product defect, but also reduce the misjudgment risk caused by empirical threshold, and can also enhance the identification accuracy of batch fluctuation, working condition drift and quality instability precursor.

This invention discloses a method for regenerating waste lithium iron phosphate batteries into lithium manganese iron phosphate cathode material, comprising the following steps: obtaining lithium sulfate solution and iron phosphate slag by oxidative acid leaching of lithium iron phosphate battery powder; calcining a mixture of manganese oxide and phosphoric acid slag to obtain ferric oxide doped with Mn and phosphorus pentoxide gas; collecting the phosphorus pentoxide gas to obtain a phosphoric acid solution, and reacting the phosphoric acid solution with ammonia and lithium sulfate solution to obtain lithium phosphate; reacting the Mn-doped ferric oxide with sulfur dioxide to obtain ferrous sulfate doped with Mn; and reacting the lithium phosphate and ferrous sulfate doped with Mn with water to obtain lithium manganese iron phosphate cathode material. The regeneration method of this invention can effectively separate lithium / iron-phosphorus, while effectively improving the recovery rate of phosphorus and iron (phosphorus recovery rate > 99%, iron recovery rate > 99%), to directly synthesize high-purity battery-grade lithium manganese iron phosphate cathode material. This method breaks through the traditional long process of dissolution-separation-resynthesis, greatly shortening the process chain and reducing material loss and energy consumption.

This invention discloses a high-strength and high-toughness glass, its preparation method, and its applications. The high-strength and high-toughness glass comprises the following components in weight percentage: silicon dioxide 65%-75%; boron trioxide 1%-4%; aluminum trioxide 3%-7%; lithium oxide 5%-10%; sodium oxide 2%-6%; potassium oxide 0%-2.5%; magnesium oxide 1%-5%; zirconium dioxide 3%-6%; phosphorus pentoxide 1%-3%; and cerium dioxide 4.5%-5.0%. The technical problem to be solved is to significantly improve the strength and toughness of the glass by selecting a specific formulation.

The utility model discloses a five phosphorus pentoxide environmental protection type production combustion furnace, including combustion furnace main part and processing box, the inside fixedly connected with filter screen of processing box, the inside slide connection has the movable plate of processing box, the inside of movable plate is provided with the sliding slot, the inside slide connection has the sliding block of sliding slot, the outside rotatory connection has the rotating plate of sliding block, the outside fixedly connected with fixed plate of movable plate, the inside rotatory connection has the cleaning roller of fixed plate. This five phosphorus pentoxide environmental protection type production combustion furnace, start motor drives rotating plate rotation, and rotating plate drives movable plate up and down movement through sliding block and sliding slot, and movable plate drives cleaning roller and carries out up and down cleaning to filter screen through fixed plate, and is driven under the action of gear and rack and rotates cleaning roller self, improves the cleaning effect, because the sliding block will move back and forth in the sliding slot, makes the sliding block can drive the bristle on the cleaning roller and move back and forth through the connecting rod and stir, prevents the brush hair and adheres the impurity.

The present application provides a phosphate ester aqueous polymer, and a preparation method therefor and a use thereof. The phosphate ester aqueous polymer is prepared by polymerizing the following monomers: a monovinyl ether, a vinylbenzene monomer, an allyl polyoxyethylene methyl-terminated polyether, and phosphorus pentoxide. The phosphate ester aqueous polymer of the present application can be used for dispersion of aqueous nano titanium dioxide, and can prepare a titanium dioxide dispersion liquid having low particle size, narrow distribution, and good stability.

This invention provides a method for preparing melamine pyrophosphate and its application, belonging to the field of flame retardant technology. The invention uses pyrophosphoryl chloride and melamine as raw materials, reacting them in an alcohol-water mixed solvent. After the reaction, the mixture is neutralized with alkali, and post-processed to obtain melamine pyrophosphate. This invention uses pyrophosphoryl chloride as the phosphorus source, solving the problems of insufficient reaction due to the high viscosity of raw materials in the traditional pyrophosphate method and the hygroscopic and difficult-to-store raw materials in the phosphorus pentoxide method. The reaction process does not require strong acid catalysis; the byproduct hydrogen chloride is converted to ammonium chloride after neutralization with ammonia water, avoiding the generation of high-salt wastewater, making the process environmentally friendly. The method of this invention features mild reaction conditions, simple operation, high product purity, and good thermal stability. The obtained melamine pyrophosphate has a purity ≥95% and a 5% thermal decomposition temperature ≥300℃, making it suitable as a halogen-free flame retardant for widespread application in epoxy resins, polyolefins, nylon, coatings, rubber, and other fields.

A special compound fertilizer for *Raspberry palmatum* and its fertilizer-saving and efficiency-enhancing fertilization method belong to the field of agricultural planting and fertilizer technology. The core components of the special compound fertilizer are nitrogen (N), phosphorus pentoxide (P₂O₅), and potassium oxide (K₂O), with a mass percentage of 16:6:22, and may contain borax and zinc sulfate. The fertilization method includes: soil diagnosis, fertilization plan formulation, precision fertilization, dynamic monitoring, and optimization. This invention provides a special fertilizer formula that matches the nutritional needs of *Raspberry palmatum* during its flowering and fruit-setting stages, and combines it with variable fertilization technology based on soil testing. This achieves a synergistic effect of fertilizer saving, increased yield, and improved quality by reducing the amount of chemical fertilizer used while effectively increasing the fruit yield and the content of key medicinal components of *Raspberry palmatum*.

This invention belongs to the field of inorganic non-metallic technology, and particularly relates to a spherical silica and its preparation method. Compared with the prior art, this invention uses phosphorus pentoxide as a carrier and composite, which acts as a dehydrating agent in the reaction, enabling the silica gel to be rapidly converted into silica. Simultaneously, a small number of Si-O-P bonds are formed, further increasing the surface activity and structural stability of the silica spheres. Furthermore, after phosphorus pentoxide is converted into phosphoric acid, it gradually condenses into polyphosphoric acid, which is readily soluble in water. Therefore, the polyphosphoric acid washed away during the final water washing process causes a large number of crystal defects to form on the surface of the silica microspheres, thereby further increasing the specific surface area and activity of the spherical silica. Thus, the obtained spherical silica has good sphericity, uniform particle size, high structural stability, good wettability, and a high specific surface area.

This application discloses a phosphorus fixation composition for incinerating phosphorus-containing organic waste liquid and its preparation method, belonging to the field of radioactive waste treatment technology. The phosphorus fixation composition for incinerating phosphorus-containing organic waste liquid includes organic waste liquid, a phosphorus-fixing agent, a phase transfer catalyst, and deionized water. The phosphorus-fixing agent has a mass fraction of 8%–15%, the deionized water has a mass fraction of 10%–20%, and the phase transfer catalyst accounts for 0.5%–2% of the organic waste liquid mass. This application achieves a highly efficient reaction between tributyl phosphate and the phosphorus-fixing agent at a low temperature of 90℃, directly converting tributyl phosphate into stable sodium phosphate, thus eliminating the formation of corrosive phosphorus pentoxide at its source. Furthermore, it solves the problems of high energy consumption, severe equipment corrosion, poor phosphorus fixation effect, and difficult transportation in existing processes. It has advantages such as a phosphorus fixation rate greater than 99%, low formulation viscosity, good stability, and no phase separation precipitation. It is suitable for the industrial-scale harmless treatment of phosphorus-containing organic waste liquid in spent fuel reprocessing and chemical extraction fields, with significant environmental and economic benefits.

This invention discloses a synergistic water-soluble fertilizer composition of macroelements and its application, relating to the field of agricultural fertilizer technology. The composition includes the following components: macroelements comprising nitrogen, phosphorus pentoxide, and potassium oxide, with a mass ratio of 20:20:20; ammonium polyphosphate, potassium dihydrogen phosphate, sulfur-based raw materials, and chelated trace elements; L-type acidic amino acids; and soluble organic matter (DOM). This synergistic water-soluble fertilizer composition of macroelements and its application, by compounding ammonium polyphosphate and potassium dihydrogen phosphate at a mass ratio of 1:(0.1-10) and using L-type acidic amino acids as chelating carriers, allows the chelating ability of ammonium polyphosphate for calcium and magnesium ions and the transport capacity of L-type acidic amino acids for trace elements to synergistically superimpose, thereby effectively inhibiting the formation of insoluble phosphate precipitates by the combination of phosphorus with calcium and magnesium ions in hard water or calcareous soil environments.

An enamel composition, a method for preparing an enamel composition, and a cooking appliance are provided. The enamel composition may include 15 to 50 wt % of phosphorus pentoxide (P2O5); 5 to 20 wt % of one or more of lithium oxide (Li2O), sodium oxide (Na2O), or potassium oxide (K2O); 1 to 5 wt % of one or more of sodium fluoride (NaF), calcium fluoride (CaF2), or aluminum fluoride (AlF3); 1 to 35 wt % of one or more of magnesium oxide (MgO), barium oxide (BaO), or calcium oxide (CaO); and 5 to 30 wt % of one or more of manganese dioxide (MnO2), molybdenum trioxide (MoO3), bismuth oxide (Bi2O3), or nickel oxide (NiO). The enamel composition may be cleaned without being putting it into water.

The present invention relates to silicate glass comprising 35-45% by mass of silicon dioxide (SiO2), up to 15% by mass of molybdenum trioxide (MoO3), 4-7% by mass of zirconium dioxide (ZrO2), 1-3.5% by mass of phosphorus pentoxide (P2O5), and 14-28% by mass of one or more alkali metal oxides and / or one or more alkaline earth metal oxides, wherein the mass percentages thereof are expressed relative to the total mass of the glass. The present invention also relates to a method for improving the solubility of molybdenum in a glass molten material.

A method for preparing biodegradable materials based on corn stalks, belonging to the field of corn stalk treatment, includes the following steps: Step 1: Stalk pretreatment and fiber extraction; Step 2: Preparation of coating solution; Step 3: Functionalization and molding: After the coating solution is scraped into a film with a thickness of 0.1-0.5 mm, it is dried at 60-65℃ for 20-24 hours, sprayed with a urea-phosphorus pentoxide-cypermethrin functional solution and dried at 60-65℃ for 8-12 hours, and then two pretreated films sprayed with functional solution are stacked and hot-pressed at 120-140℃ for 8-10 minutes to obtain a biodegradable agricultural film. This invention uses agricultural waste corn stalks as the core raw material, solves the air pollution problem caused by traditional straw burning, and realizes a resource-based closed loop of "waste-high value-added materials". Each ton of straw can be converted into 150-200 kg of biodegradable agricultural film, and the comprehensive utilization rate of raw materials is increased to more than 85%, which is far higher than the 50%-60% utilization rate of existing processes.

This invention proposes a method for improving nutrient utilization efficiency in oil palm through synergistic reduction of fertilization and mechanical weeding, relating to the field of agricultural planting management technology. The method involves the formulation of nitrogen, phosphorus, and potassium fertilizers, with pure nitrogen applied at a rate of 120-156 kg / ha per year, phosphorus pentoxide at 15-20 kg / ha per year, and potassium oxide at 160-210 kg / ha per year. The fertilizers are applied twice, in April and October each year, within a 2-meter radius of the oil palm trees. Mechanical weeding is performed at the same frequency within the 2-meter radius of the oil palm trees and between rows, without the use of chemical herbicides. This invention improves nitrogen utilization efficiency by over 65% while maintaining the yield of fresh oil palm fruit, and increases the yield increase of phosphorus and potassium fertilizers by over 195% and 20% respectively, while significantly reducing nitrogen leaching loss from deep soil layers. It is suitable for mature oil palm plantations on mineral soils.

This invention discloses a method for preparing sodium difluorophosphate, comprising the following steps: reacting phosphorus pentachloride, phosphorus pentoxide, and sodium hydrogen fluoride as raw materials in an organic solvent; after the reaction, purging with inert gas, filtering, concentrating and crystallizing, washing, and drying to obtain sodium difluorophosphate. This method features low raw material cost, simple process, rapid reaction, few by-products, no water introduction, high product purity, and is environmentally friendly.