31results about "Phosphorous acid" patented technology

The present application relates to the technical field of preparation of disodium hydrogen phosphite, and discloses a method for preparing disodium hydrogen phosphite, comprising the following steps: S1, dissolving phosphorous acid and sodium hydroxide in distilled water under an inert gas atmosphere, wherein the molar ratio of phosphorous acid to sodium hydroxide is 1:(1.9-2.3), and stirring for reaction; S2, evaporating and concentrating the solution obtained in S1 to 1 / 4-1 / 3 of the original volume, cooling the solution to 25-35°C, and filtering to obtain solid disodium hydrogen phosphite; S3, adding disodium hydrogen phosphite seed crystals to the filtrate obtained in S2, cooling the solution to 15-25°C while stirring, and filtering when the crystals no longer increase to obtain disodium hydrogen phosphite; the amount of disodium hydrogen phosphite seed crystals added is 0.5-3% by weight of the phosphorous acid added in S1; the method has the advantages of improving the purity and production efficiency of disodium hydrogen phosphite.

The invention discloses a method for preparing a phosphite positive electrode material, and belongs to the technical field of preparation of phosphite positive electrode materials. The method comprises the following steps: S1, respectively dissolving a phosphorus source, a lithium source or a sodium source and a transition metal source in a solution; s2, an antioxidant is added into the solution, and the solution is mixed after dissolution; s3, transferring the mixed solution into a reaction kettle for hydrothermal reaction; s4, after the hydrothermal reaction is finished, washing and drying the obtained precipitate; and S5, sintering the dried product in the step S4 in an atmosphere, wherein the sintered product is the phosphite positive electrode material. Through the hydrothermal method, the preparation process is simplified, the process steps are reduced, the energy consumption is reduced, various parameters are controllable, the problems of tedious steps and relatively high energy consumption of the current preparation of the battery positive electrode material are solved, and the requirements of high energy density, low cost and high safety are met.

A method of producing lithium difluorophosphate, the method including: a step of obtaining a first raw material mixture by mixing lithium hexafluorophosphate, at least one selected from the group consisting of an oxide of phosphorus (A) and a lithium salt of a phosphoric acid (B), and a hydrocarbon solvent having from 6 to 12 carbon atoms; a step of obtaining a second raw material mixture by removing at least a part of the hydrocarbon solvent contained in the obtained first raw material mixture; and a step of producing a crude product containing lithium difluorophosphate by reacting the second raw material mixture.

This invention belongs to the field of flame retardant materials technology, and specifically relates to a crystalline aluminum phosphite, its preparation method, and its applications. The XRD pattern of the crystalline aluminum phosphite of this invention shows diffraction peaks at 2θ of 12.0, 14.0, 15.0, 15.5, 16.0, 17.5, 20.0, 22.5, 23.5, 29.0, 30.0, 30.5, 31.0, 32.0, 33.0, 36.5, 38.5, and 45.0 ± 0.2°. The crystallization-directing agent of this invention is in a cross-linked state and has high activity. As a crystallization-directing agent, it promotes product growth along the crystallization-directing agent structure, improves the crystal structure of the product, reduces crystal defects, and results in a crystalline aluminum phosphite with high purity and high temperature resistance. Its use in the preparation of plastics gives the plastics good mechanical and flame-retardant properties, meeting the processing requirements of polymer materials with high heat resistance.

This application relates to an organic compound, a perovskite precursor solution, a perovskite film, a perovskite cell, and an electric apparatus. The organic compound includes: a cation M; and an anion Q bonded to the cation M; where M includes one or more of CH3NH3+, CH5N2+, Cs+, and C2H5NH3+; and Q includes one or more of H2POx− and H2NOy−, where x and y are each independently an integer from 2 to 4.

This invention belongs to the field of oxyacid synthesis technology of phosphorus, specifically relating to a method for producing phosphorous acid. The production method includes: (1) adding a metal precursor, organic ligand, reaction promoter, structure directing agent and swelling resistant agent to a pore-forming agent and heating to react, to obtain a mixture; then mixing the mixture with a polymer monomer, crosslinking agent and initiator to obtain an oil phase for later use; mixing a dispersant with water and removing oxygen to obtain an aqueous phase for later use; (2) mixing the oil phase and the aqueous phase to carry out a crosslinking reaction to obtain a crude product; (3) washing, acidifying and vacuum drying the crude product to obtain a porous polymer carrier; (4) after the porous polymer carrier swells in water, adding phosphorus trichloride to it, carrying out a heat preservation reaction, and post-treatment to obtain phosphorous acid. This invention improves the production efficiency of phosphorous acid while ensuring a high yield of phosphorous acid by preparing a porous polymer carrier and using it as a medium for the hydrolysis of phosphorus trichloride to prepare phosphorous acid.

To provide: a novel organic ammonium salt which has excellent freezing point lowering function; and a composition which is capable of forming the salt.SOLUTION: An organic ammonium salt according to the present invention contains a cation and an anion; the cation is an ammonium cation that is represented by a formula (I) (wherein each R1 independently represents an organic group having 1 to 22 carbon atoms; each R2 independently represents a hydroxy hydrocarbon group that has one or more hydroxyl groups and a hydrocarbon moiety having 1 to 22 carbon atoms and optionally having an oxygen atom, or the like; and each of l, m and n represents an integer of 0 to 4, with the total of l, m and n being 4); and the anion is a phosphonate ion or a phosphinate ion.SELECTED DRAWING: None

The invention relates to the technical field of chemical intermediates, and relates to C07F, in particular to a preparation method for co-production of acetyl chloride and phosphorous acid as well as a product and application thereof. The preparation method at least comprises the following steps: S1, stirring and cooling acetic acid and a catalyst, dropwise adding phosphorus trichloride, heating to 20-45 DEG C, and reacting for 0.5-6 hours; s2, after the reaction is finished, carrying out negative pressure desolvation to obtain a crude product acetyl chloride, and continuously heating to remove excessive phosphorus trichloride, so as to obtain a crude product phosphorous acid; s3, rectifying the crude product acetyl chloride to obtain an acetyl chloride product; recrystallizing the crude phosphorous acid to obtain a phosphorous acid product; the catalyst comprises at least one of aluminum trichloride, ferric trichloride, titanium tetrachloride, ytterbium trifluoromethanesulfonate and iodine; the mass ratio of the acetic acid to the catalyst is 1: (0-0.003). The method provided by the invention has the characteristics of high conversion rate, high yield, high content, small amount of three wastes, no solvent pollution, simple process, easy industrial preparation of acetyl chloride and the like.

Disclosed are methods and systems for capturing carbon dioxide and utilizing calcium sulfate to generate useful products.

The invention discloses a phosphorus-containing hybrid metal salt compound and a preparation method and application thereof, the phosphorus-containing hybrid metal salt compound and dialkyl phosphinate have good flame-retardant synergy, the flame-retardant efficiency can be improved, and meanwhile, the corrosivity of a dialkyl phosphinate flame retardant can be reduced.

Provided is a non-aqueous electrolyte solution for a lithium secondary battery containing a lithium salt, an organic solvent and a phosphoric acid-based additive of specific structure. By adding the phosphoric acid-based additive according to an embodiment of the present invention to the electrolyte solution, the lithium secondary battery can significantly improve the high temperature stability.

This application relates to an organic compound, a perovskite precursor solution, a perovskite film, a perovskite cell, and an electric apparatus. The organic compound includes: a cation M; and an anion Q bonded to the cation M; where M includes one or more of CH3NH3+, CH3N2+, Cs+, and C2H5NH3+; and Q includes one or more of H2POx- and H2NOy-, where x and y are each independently an integer from 2 to 4.

The present invention relates to a method for producing a composition containing a phosphonate salt by mixing the reaction partners in solid form. The invention also relates to solid compositions A obtainable by said method and to the use of these compositions for combating harmful fungi.The invention moreover relates to compositions B comprising (a) a phosphonate salt of an alkali or earth alkaline metal or of two or more alkali and / or earth alkaline metals, and (b) sulfur and / or urea. In one embodiment, this composition B is solid. In another embodiment, this composition B comprises calcium phosphonate, magnesium phosphonate and sulfur.The invention also relates the use of these compositions A or B for combating harmful fungi.

The invention belongs to the technical field of oxygen-containing acid synthesis of phosphorus, and particularly relates to a phosphorous acid evaporation and concentration process. According to the phosphorous acid evaporation and concentration process, a phosphorous acid crude product is treated by an evaporation and concentration system to obtain a phosphorous acid finished product; wherein the evaporation and concentration system comprises a first-stage falling film evaporator, a second-stage falling film evaporator and a third-stage falling film evaporator which are connected in sequence, auxiliaries are added from the third-stage falling film evaporator, and the auxiliaries comprise polyethylene glycol diamine, N, N-diethyl hydroxylamine and sodium octyl sulfosuccinate. According to the invention, the evaporation and concentration system is designed and the auxiliary agent is supplemented, so that the residual quantity of hydrogen chloride in the phosphorous acid crude product is further reduced, the high-purity phosphorous acid finished product is prepared, and the phosphorous acid finished product can be used in the fields with high purity requirements, such as semiconductor wafer cleaning agents.

The invention provides steam purification equipment for preparing phosphorous acid and a control system thereof, and relates to the technical field of purification equipment, the steam purification equipment comprises a shell, an auxiliary part, a control part and a heating part; two supporting legs are symmetrically welded to the bottom end face of the shell and make contact with the ground, a containing barrel is installed in the shell, and a mounting plate is welded to the right end face of the shell. A mounting seat is mounted on the top end face of the rotating shaft, and nozzles are mounted on the top end face of the mounting seat in a linear array shape and located below the containing barrel; the rotating shaft is of a hollow structure and communicates with the mounting base and the spray head; the rotating shaft is rotationally connected with an air inlet pipe, the air inlet pipe communicates with the rotating shaft, and in the using process, when the rotating shaft rotates, uniform heating of the containing barrel can be achieved through a spray head. The problems that according to an existing device, after a worker touches purification equipment, the worker is prone to being scalded, and the condensation effect is reduced due to the fact that the airflow flowing speed is high during condensation are solved.

The application discloses a kind of nitrogen-doped sodium ion battery polyanion positive electrode materials and preparation method thereof, by chromium doping or replacement nitrogen triphosphoric polymeric vanadium trisodium polyanion positive electrode material, citric acid is dissolved with transition metal in deionized water, V source, Cr source, ascorbic acid and transition metal, Na source and P source are added respectively, while the deionized water solution of 12wt% polyvinylpyrrolidone dissolved, urea is added to mixed solution and is magnetically stirred, evaporates by water, drying, grinding, is formed into tablet by mould pressing;With urea grinding and tabletting by mould are together to the test tube and are vacuum sealed, and are placed in muffle furnace and are kept at high temperature, then are taken out and are naturally cooled to room temperature, obtain the positive electrode material.The application does not need to continuously pass in ammonia in preparation process, and reduces the V source consumption, significantly reduces the manufacturing cost is low and manufacturing equipment is simple, improves safety, and is convenient to implement;The cycle of the material prepared is good, and the specific capacity is high.

The present disclosure provides an aluminum phosphite-based complex with dual-peak thermal gravity decomposition characteristics and a preparation method and use thereof. A structural formula of the complex is as follows: ((HPO3)3Al2) · ((H2PO3)3Al )x, wherein x is 0.01-0.5 and represents a molar ratio of (H2PO3)3Al to (HPO3)3Al2. The dual-peak thermal gravity decomposition characteristics are as follows: a first gravity peak temperature is 460-490°C, and a second gravity peak temperature is 550-580°C. The preparation method includes: uniformly mixing aluminum phosphite and aluminum hydrogen phosphite according to the ratio in the structural formula, and then performing stepwise heating at a rate of 5°C / min to raise the temperature of a mixture from the normal temperature to no more than 350°C within 1-10 hours, so as to obtain the aluminum phosphite-based complex with the dual-peak thermal gravity decomposition characteristics. The complex may serve as or is configured to prepare a flame retardant or a flame-retardant synergist.

The invention belongs to the technical field of oxygen-containing acid synthesis of phosphorus, and particularly relates to a phosphorous acid production method. The production method comprises the following steps: (1) adding a metal precursor, an organic ligand, a reaction promoter, a structure-directing agent and a swelling-resistant agent into a pore-foaming agent, and carrying out a heating reaction to prepare a mixture; then blending the mixture with a polymer monomer, a cross-linking agent and an initiator to obtain an oil phase for later use; blending the dispersing agent with water, and deoxidizing to obtain a water phase for later use; (2) blending the oil phase and the water phase for cross-linking reaction to obtain a crude product; (3) carrying out washing, acidification and vacuum drying on the crude product to obtain a porous polymer carrier; and (4) after the porous polymer carrier swells in water, adding phosphorus trichloride into the porous polymer carrier, and carrying out heat preservation reaction and post-treatment to obtain the phosphorous acid. According to the method, the porous polymer carrier is prepared and used as a medium for preparing the phosphorous acid by hydrolyzing phosphorus trichloride, so that the production efficiency of the phosphorous acid is further improved while the high yield of the phosphorous acid is ensured.

The utility model provides a hydrogen chloride gas absorption device for phosphorous acid production, which comprises an absorption tank, the absorption tank is vertically arranged, the inner upper end of the absorption tank is fixedly connected with a liquid distribution disc, the absorption tank is also fixedly connected with a liquid inlet pipe, one end of the liquid inlet pipe extends into the absorption tank and is provided with a downward liquid outlet positioned above the liquid distribution disc, and the other end of the liquid inlet pipe extends into the absorption tank. A plurality of liquid distribution holes are formed in the liquid distribution disc in a penetrating manner; an air inlet pipe is further fixedly connected to the absorption tank, a plurality of mounting ring pipes which are located below the liquid distribution disc and are concentrically arranged are further fixedly arranged in the absorption tank, the mounting ring pipes are fixedly communicated through a plurality of connecting pipes, the air inlet pipe is further communicated with the mounting ring pipe located on the outermost side, and a plurality of spray heads are further installed on the mounting ring pipes. The absorption efficiency of the hydrogen chloride gas can be improved, and most of the hydrogen chloride gas in the tail gas can be absorbed through one-time absorption treatment.

This invention belongs to the field of oxyacid synthesis technology of phosphorus, specifically relating to a phosphorous acid evaporation and concentration process. The phosphorous acid evaporation and concentration process involves processing crude phosphorous acid through an evaporation and concentration system to obtain a finished phosphorous acid product. The evaporation and concentration system includes a first-stage falling film evaporator, a second-stage falling film evaporator, and a third-stage falling film evaporator connected in sequence. An auxiliary agent is added from the third-stage falling film evaporator, including polyethylene glycol diamine, N,N-diethylhydroxylamine, and sodium succinate sulfonate. This invention, by designing an evaporation and concentration system and using auxiliary agents, further reduces the residual hydrogen chloride content in the crude phosphorous acid product, obtaining a high-purity finished phosphorous acid product. This finished phosphorous acid product can be used in fields requiring high purity, such as semiconductor wafer cleaning agents.

The present technology is based on a waste salt of diethyl methyl phosphite, and fine separation and resource utilization of the waste salt with high salt, rich aluminum, phosphorus and organic matter are carried out to prepare a large amount of water treatment agent and new coating material. The waste salt is subjected to steps of dissolution-oxidation-blown off-filtration-odor removal, organic phosphorus is oxidized and converted into phosphite, and deep dephosphorization and accumulation of phosphite are carried out by adsorption. Calcium and zinc oxides are added to prepare phosphite corrosion-resistant coating. The precipitated aluminum hydroxide is cleaned, dissolved, adsorbed, dephosphorized and oxidized to prepare low-sodium dephosphorized polyaluminum ferric chloride. The collected solution is a low-phosphorus and aluminum-free near-saturated salt solution, which is electrolyzed to prepare water treatment agents such as liquid caustic soda and sodium hypochlorite.

The device sequentially comprises a purification kettle, a mixed liquid pump and a turbid filter from a feeding pipe to a discharging pipe, the top of the purification kettle is provided with the feeding pipe, an adsorption material feeding port and a thermometer port, the purification kettle is internally provided with a stirring assembly, and the lower portion of the purification kettle is provided with a discharging port. The turbid type filter comprises a cylinder body, a liquid inlet, a filter residue outlet, a residual liquid discharge port, a filter element, a liquid collection assembly, an exhaust hole, an instrument port and an air inlet. The related process steps are as follows: S1, preparing an adsorption material; s2, carrying out adsorption treatment on the dimethyl phosphite high-boiling substance; s3, conveying the mixed solution subjected to adsorption treatment into a turbid filter for solid-liquid separation; s4, carrying out post-treatment on the filtered phosphorous acid solution; s5, product detection.According to the method, the content of chloride in solid phosphorous acid can be effectively reduced through the synergistic adsorption effect of diatomite and activated carbon in combination with efficient filtration of the turbid filter.

The application discloses a kind of green treatment methods of nickel-phosphorus chemical plating aging liquid.The method is first reacted with aluminium sulfate and phosphite and hypophosphorous acid in nickel-phosphorus chemical plating aging liquid, respectively generate insoluble in water aluminium phosphite and aluminium hypophosphite, solid-liquid separation and washing solid while hot, recycle solid as the mixture of aluminium phosphite and aluminium hypophosphorous acid, then liquid is frozen so that sodium sulfate is solid, solid-liquid separation while cold, recycle solid sodium sulfate decahydrate, i.e., mirabilite, recycle liquid is used as plating bath evaporation makeup liquid, to make up the evaporation loss of plating solution in plating process.The treatment method of nickel-phosphorus chemical plating aging liquid of the application has little influence on the composition and content of various additives in plating solution, resources are recycled and utilized, simple operation, low cost, environment-friendly.

The present invention is related to an advanced control method—including a fast response method—to stabilize, optimize and or maximize the output flow of an evaporation unit via ultrasonic controlled sound or vibration applied to the said evaporation unit. The invention further provides equipment wherein said method is being implemented, such as an evaporation or separation unit.

An advanced control method is provided, including a high-speed response method, for stabilizing, optimizing, and / or maximizing the output flow of an evaporation unit via ultrasonically controlled sound or vibration applied to the evaporation unit. [Solution] A method for controlling the physical properties of the liquid fraction and / or vapor fraction of the output stream of an evaporation unit, including vapor pressure, viscosity, temperature, composition and / or density, comprising: a. assigning set values ​​to the physical properties of the liquid fraction and / or vapor fraction; b. measuring one or more of the physical properties of the liquid fraction and / or vapor fraction; c. comparing the given set values ​​and measured values ​​of the physical properties of the liquid fraction and / or vapor fraction; and d. adjusting the energy input of the vaporization input, which is characterized by a combination of heat and ultrasound, to adjust the physical properties of the liquid fraction and / or vapor fraction to match the set values.

This application relates to an organic compound, a perovskite precursor solution, a perovskite film, a perovskite cell, and an electric apparatus. The organic compound includes: a cation M; and an anion Q bonded to the cation M; where M includes one or more of CH3NH3+, CH3N2+, Cs+, and C2H5NH3+; and Q includes one or more of H2POx- and H2NOy-, where x and y are each independently an integer from 2 to 4.

The invention discloses a method for preparing high-purity and high-thermal-stability aluminum phosphite through continuous flow, which comprises the following steps: pumping a phosphorous acid aqueous solution and aluminum hydroxide slurry into an ultrasonic tubular reactor through a metering pump by adopting a continuous flow preparation process, and reacting at 40-80 DEG C for 10-60 seconds to generate a reaction solution of aluminum phosphite trihydrate; and filtering, washing with pure water, drying at 150 DEG C, and crushing to obtain a high-purity aluminum phosphite finished product. The problems of incomplete raw material reaction, low product purity, high production energy consumption and the like in the prior art are solved, the prepared aluminum phosphite product has the characteristics of high purity (greater than 99%), high yield (greater than 99.5%), high thermal stability (T1% greater than 300 DEG C), weak acidity (pH: 6.5) and the like, the reaction time is greatly shortened (20s), the operation is simple, the batch repeatability is good, the production energy consumption is low, and large-scale industrial production is easy to realize. The flame retardant can meet the requirements of high-temperature application environments, does not corrode processing equipment of downstream enterprises, and obviously widens the application range of aluminum phosphite in the field of flame retardants.

The application provides a compound antimony subphosphate and a nonlinear optical crystal of antimony subphosphate, a preparation method and an application, the chemical formula of the compound is SbH3P2O6, the molecular weight is 282.7, and the compound is prepared by a vacuum packaging method or a room temperature solution method; the chemical formula of the compound of the crystal is SbH3P2O6, the molecular weight is 282.7, the crystal belongs to a monoclinic system, the space group is Pc , the cell parameters are a = 7.6318 (12) Å, b = 5.3723 (9) Å, c = 7.5537 (12) Å, α = 90°, β = 108.154 (6) °, γ = 90°, and the unit cell volume is 294.29 (8) Å 3 The frequency doubling effect of the crystal is about 2 times of that of KH2PO4 (KDP), the ultraviolet cutoff edge is lower than 204 nm, the crystal is grown by a hydrothermal method, a vacuum packaging method or a room temperature solution method, the chemical stability of the crystal is good, and the crystal can be applied to a short-wavelength nonlinear optical crystal in a full solid-state laser.