1799 results about "Hydrogen fluoride" patented technology

The invention discloses a big data-driven hydrogen fluoride purification risk entropy assessment and multi-parameter monitoring system, which relates to the technical field of chemical process monitoring, comprises a multi-mode heterogeneous sensor network, and realizes high-precision detection and three-dimensional monitoring by using a nanowire FET (Field Effect Transistor) and the like. The space-time tensor decomposition module extracts features and identifies a causal relationship; the risk entropy manifold learning module evaluates the risk; the self-adaptive twin network monitors the abnormity and simulates and disposes the abnormity; and a knowledge graph-reinforcement learning system decision making subsystem and a plurality of subsystems such as an optical monitoring subsystem and a multi-scale modeling subsystem are also provided, so that whole-process risk management and control are realized. The hydrogen fluoride purification monitoring level is greatly improved, the detection sensitivity and the anomaly detection accuracy are remarkably improved, risk early warning is more timely, decision response is accelerated, the production efficiency is improved, energy consumption is reduced, the system has self-repairing and self-power-supply capabilities, data are safe and traceable, reliable operation of the system is guaranteed, and economic losses and potential safety hazards are reduced.

The invention discloses a phosphorus oxyfluoride reaction and separation integrated preparation tower, and belongs to the field of industrial equipment for phosphorus oxyfluoride preparation, the preparation tower comprises a tower body, the tower body is provided with a feeding area, a reaction area and a separation area, the feeding area and the separation area are both filled with filler sections of filler, a first feeding port is formed in the bottom of the filler section in the feeding area, and a second feeding port is formed in the bottom of the reaction area. A tubular heat exchanger is arranged in each reaction zone, a threaded pipe is arranged on each tubular heat exchanger, filler is also filled between the threaded pipes, a second feeding hole is formed in the upper part of the reaction zone on the top layer, and polyphosphoric acid and anhydrous hydrogen fluoride are contacted in the reaction zones to form a concentration stepped reaction and a temperature stepped reaction; and the phosphorus oxyfluoride gas generated after the reaction is fractionated through the filler section on the separation area and enters the next process from the top of the tower body. According to the invention, the reaction and separation of phosphorus oxyfluoride production are integrated, the energy consumption of phosphorus oxyfluoride production is reduced, the production cost is reduced, and the reaction yield is improved.

The invention discloses a preparation method and a production system of phosphorus trifluoride, and belongs to the technical field of preparation of phosphorus trifluoride. Phosphorus trichloride and first mixed gas are continuously introduced into a reactor, the first mixed gas comprises anhydrous hydrogen fluoride and inert gas, phosphorus trichloride and anhydrous hydrogen fluoride in the first mixed gas are subjected to a double decomposition reaction in the reactor, and intermediate gas containing phosphorus trifluoride is generated. Collecting intermediate gas discharged from the reactor, and rectifying and purifying the intermediate gas to obtain a phosphorus trifluoride product. The inert gas carries anhydrous hydrogen fluoride and phosphorus trichloride to generate double decomposition reaction to generate phosphorus trifluoride, and the inert gas can dilute the concentration of the raw material gas anhydrous hydrogen fluoride participating in the reaction and also can take away heat generated by the reaction, so that the temperature of the reactor is more stable, and continuous production of phosphorus trifluoride is realized.

In one embodiment, an anhydrous hydrogen fluoride generator vessel (also referred to herein as the “AHF generator vessel”) is provided. In several embodiments, an AHF generator vessel may include a container assembly, one or more shelves, and a center pipe assembly. The container assembly may include a lid assembly that may be removably coupled to the wall, and one or more feet. The center pipe assembly may include a base adapter, a center pipe, and a bottom adapter. In one embodiment, sodium bifluoride is loaded onto the one or more shelves which are positioned perpendicular to the center pipe and stacked upon one another. An external heat source may provide the heat to the vessel to thermally degrade the sodium bifluoride into HF and sodium fluoride (NaF). In various embodiments, the HF may be carried by a carrier gas out of the AHF generator vessel via the lid assembly.

The invention relates to a comprehensive utilization method of fluosilicic acid containing hydrogen fluoride, which comprises the following steps: 1) reacting a stock solution containing fluosilicic acid with a potassium fluoride raw material, and carrying out solid-liquid separation to obtain potassium fluosilicate and a hydrofluoric acid solution; 2) reacting potassium fluosilicate with a sodium hydroxide raw material, and carrying out solid-liquid separation to obtain a mixture of a potassium fluoride solution, sodium fluoride and silicon dioxide; and returning the potassium fluoride solution to the step 1) to be recycled as a potassium fluoride raw material. According to the scheme, hydrofluoric acid is prepared from fluosilicic acid containing hydrogen fluoride, sodium fluoride and water glass products are produced at the same time, no other byproduct waste is produced, and the raw material utilization rate is high. And meanwhile, the method has the advantages of low raw material cost, low equipment cost and low energy consumption cost, can generate remarkable economic benefits, and is suitable for popularization and application.

The invention discloses a millisecond regulation and control method for hydrogen fluoride production based on reinforcement learning and model prediction control, and relates to the field of hydrogen fluoride production regulation and control. In the multi-scale neural symbol dynamics modeling step, GNN, a cellular automaton and a state space model are fused, and parameters are updated in real time; in the causal reinforcement learning decision optimization step, an effect is calculated through a causal graph, and a reward function is optimized; in the time-space fractional order sliding mode control step, a fractional order sliding mode surface and a controller are designed, and rapid and stable control is achieved; in the memory enhancement element learning adaptation step, a DNC storage strategy is utilized, new working conditions are quickly adapted through element gradient, and millisecond-level precise regulation and control are achieved. According to the method, prediction errors are greatly reduced, the response speed is increased, and overshoot is reduced; the product yield is improved, the energy consumption is reduced, and new working conditions are quickly adapted; fault detection and risk early warning are more accurate, equipment operation is more stable, production efficiency is effectively improved, cost is reduced, and safety is enhanced.

The invention discloses a method and a device for preparing high-purity molybdenum hexafluoride. The preparation method comprises the following steps: (1) preheating nitrogen trifluoride; (2) carrying out contact reaction on nitrogen trifluoride and metal molybdenum in the reactor; (3) settling the gas product through a settling tank to remove particulate matters, and collecting crude molybdenum hexafluoride gas; (4) introducing the molybdenum hexafluoride crude gas into an adsorption tower, and adsorbing to remove hydrogen fluoride; and (5) collecting a molybdenum hexafluoride finished product, and repeatedly heating, freezing and vacuumizing to remove low-boiling-point impurities to obtain the molybdenum hexafluoride product with the purity not lower than 99.996%. A nitrogen trifluoride steel cylinder, a mass flow controller, a nitrogen trifluoride preheater, a first reactor, a second reactor, a third reactor, a settling tank, a crude product storage tank, an adsorption tower and a finished product storage tank are sequentially connected, wherein the third reactor is formed by connecting three reaction containers in series; the adsorption tower is formed by connecting two stages of towers in series, and the adsorption tower is filled with sodium fluoride.

The invention discloses a water-based lithium battery positive electrode adhesive, a preparation method and application. The adhesive is of a single-layer or multi-layer shell core-shell structure formed by polar monomers such as acrylic acid, acrylate monomers, cross-linking monomers, self-emulsifying monomers and water through core-shell emulsion polymerization; by controlling the mass percent of acrylate monomers, polar groups and the like in the core layer structure and the shell layer structure and selecting proper types and dosages of cross-linking monomers and self-emulsifying monomers, the adhesive has proper surface tension, shows excellent adhesion and wettability to the current collector, has high peel strength, and is suitable for the current collector. According to the present invention, the lithium ion battery pole piece has the low glass-transition temperature so as to ensure the high toughness, the high surface density, the excellent electrolyte resistance, the excellent electrical property, the excellent coating property and the like of the pole piece, and the raw materials are all non-fluorine materials so as not to produce hydrogen fluoride and other harmful gases during the lithium battery recovery; water is used as a solvent, recycling is not needed, environment friendliness and low carbon are achieved, the manufacturing process is simplified, and the application range is widened.

The invention belongs to the technical field of oil and gas development, and particularly relates to an oil and gas well blocking remover and a preparation method thereof. The blocking remover comprises the following components: 5-8% of low-carbon composite organic acid, 5-7% of fluoboric acid, 6-9% of ammonium bifluoride, 4-6% of an anti-acid sludge mutual solvent, 2-4% of a corrosion inhibitor, 2-4% of polyoxypropylene polyoxyethylene propylene glycol ether, 8-12% of a permeation dispersion surfactant, 2-5% of a sulfur dissolving agent, 2-5% of a stable chlorine dioxide solution and the balance of water. The preparation method comprises the following steps: adding the low-carbon composite organic acid, the fluoboric acid and the ammonium bifluoride into water and stirring; adding an acid sludge resisting mutual solvent and a sulfur dissolving agent, and stirring; adding the corrosion inhibitor, the polyoxypropylene polyoxyethylene propylene glycol ether and the permeation dispersion surfactant, and stirring; and finally, reducing the stirring speed, adding the stable chlorine dioxide solution, and stirring to uniformly mix. The blocking remover provided by the invention is comprehensive in blocking removal function, very good in dissolving and dispersing performance on complex blocking substances, very small in corrosion damage to a shaft pipe wall and wide in applicability.

The invention belongs to the technical field of preparation of lithium bis (fluorosulfonyl) imide, and particularly relates to a preparation method of lithium bis (fluorosulfonyl) imide, which comprises the following steps: step 1, reacting chlorosulfonic acid with chlorosulfonyl isocyanate under the action of a first catalyst to generate bis (fluorosulfonyl) imide; 2, hydrogen fluoride gas is introduced into the bis (chlorosulfonyl) imide generated in the step 1, and bis (fluorosulfonyl) imide is obtained under the action of a first catalyst; and 3, adding a first lithium salt into an organic solvent, adding the imidodisulfuryl fluoride obtained in the step 2 in the stirring process, and carrying out ion exchange to obtain the lithium imidodisulfuryl fluoride. According to the invention, the conversion rate is high, the usage amount of the catalyst is reduced, the steps are simplified, and the yield is further improved.

Disclosed in the present invention is a method for co-producing 3,3,3-trifluoropropene and 2,3,3,3-tetrafluoropropene. The method comprises: introducing 1,1,1,3-tetrachloropropane, 1,1,1,2,3-pentachloropropane, and hydrogen fluoride into a first reactor, and reacting under the action of a first catalyst to obtain a first reactor reaction product; performing rectification on the first reactor reaction product to obtain a 3,3,3-trifluoropropene product and a tower kettle product, mixing the tower kettle product with hydrogen fluoride, and then introducing the mixture into a second reactor, and reacting under the action of a second catalyst to obtain a second reactor reaction product; and separating the second reactor reaction product from hydrogen chloride, water washing, alkaline washing, and drying to obtain a 2,3,3,3-tetrafluoropropene product. The present invention has the advantages of simple process, high efficiency, flexible operation, low investment, and low energy consumption.

The invention discloses a method for continuously producing fluorobenzene, which comprises the following steps: S10) mixing anhydrous hydrogen fluoride and aniline in a tubular reactor to obtain an aniline hydrofluoride mixture; s20) introducing the aniline hydrofluoride mixture into a venturi tube reactor in an inert gas atmosphere, sucking powdered and dried sodium nitrite into the venturi tube reactor in a negative pressure environment formed by the venturi tube reactor, and carrying out a synthetic reaction to obtain a diazonium solution; s30) transferring the diazonium solution into a tubular reactor for pyrolytic reaction to obtain a crude fluorobenzene solution; s40) refining the crude fluorobenzene raw material to obtain fluorobenzene; according to the method disclosed by the invention, the crossing from an intermittent artificial kettle reaction to a continuous reaction is realized, the reaction is sufficient and complete, no 70% hydrofluoric acid mother liquor, no 70% sulfuric acid waste liquor, no high-concentration wastewater and no yellow mud solid waste are produced, a high-quality fluorobenzene product can be continuously prepared in a large batch, and the method has good economic and environmental benefits and a wide market application prospect.

The invention discloses a purification method for removing quartz inclusion, which comprises the following steps: calcining a quartz sand raw material at high temperature for a certain time, then taking out and quickly putting into cold water for cold quenching; dehydrating quartz sand, feeding into a microwave reactor, heating to a set temperature, and keeping for a period of time; after the reaction is finished, cleaning the quartz sand with ultrapure water; filling the quartz sand into a high-temperature and high-pressure reactor, introducing supercritical carbon dioxide and hydrogen fluoride mixed gas, and keeping the temperature and the pressure for a period of time; and after the reaction is finished, discharging gas to obtain the high-purity quartz. Through two-stage heat treatment, a channel between gas-liquid inclusions in quartz particles and the outside can be efficiently opened, and meanwhile, the supercritical method ensures that impurities in the inclusions can be effectively dissolved out; the treatment time is short, the required temperature is low, the acid consumption is less than 10%, and the method has the advantages of high efficiency and low cost.

The invention discloses a diamond film and a preparation method and application thereof, and the preparation method comprises the steps: taking a substrate material matched with the lattice constant of a diamond film material as a substrate, and carrying out the surface treatment of the substrate; mixed reaction gas comprising 80%-95% of hydrogen, 3%-8% of methane and 2%-12% of auxiliary gas is introduced, wherein the auxiliary gas comprises at least one of argon, chlorine, hydrogen fluoride and hydrogen chloride; carrying out controlled chemical vapor deposition at 850-1000 DEG C under the pressure of not less than 21 kPa, and growing a diamond film on the surface of the substrate; and annealing the diamond film. According to the method, chemical vapor deposition is controlled through cooperation of auxiliary gas and temperature-pressure gradient, and non-corrosion high-speed growth of the high-purity monocrystal diamond film is achieved; in combination with a dynamic annealing process, lattice defects are effectively repaired, the comprehensive performance is optimized, and the reliability of the thin film serving as a heat dissipation component and other applications is remarkably improved.

The invention discloses an in-kettle environment pressure stabilizing structure applied to an anhydrous hydrogen fluoride arsenic removal process, relates to the technical field of arsenic removal processes, and provides an improvement process about a rubber isolation pad and a lower supporting table on the basis of an oxidation reaction process in the anhydrous hydrogen fluoride arsenic removal process and on the basis of not changing the reaction process. The basic content is as follows: the reaction volume in the reaction cavity is changed by utilizing the elastic deformation of the rubber isolation pad and the supporting effect of the lower supporting table, so that the effect of preliminarily adjusting the environmental pressure in the reaction cavity is achieved; a combined or independent regulation and control process is carried out mainly aiming at a low-pressure state and an overpressure state, a pressure difference and pressure balance transfer principle is further utilized, and the environment pressure stabilizing effect in a container is achieved through the simplest and effective structure.

The invention discloses a BOE waste liquid treatment method and device. The method comprises the following steps: replacing hydrogen fluoride in BOE waste liquid with sulfuric acid, evaporating, fractionating and recovering hydrofluoric acid, neutralizing evaporated residual liquid with ammonia to obtain a fluorine-containing ammonium sulfate solution, defluorinating with fluorgypsum slurry to obtain a low-fluorine ammonium sulfate solution, and concentrating and crystallizing to obtain an ammonium sulfate product. The BOE waste liquid is treated by adopting the scheme, the bottleneck of the market capacity of ammonium bifluoride is avoided, the hydrofluoric acid product and the ammonium sulfate product with huge market capacity are produced, the value orientation of turning waste into wealth, circular economy and environmental protection is really realized, and the method is suitable for industrial popularization and application.

In some embodiments, a method for semiconductor processing preclean includes removing an oxide layer from a substrate using anhydrous hydrogen fluoride in combination with water vapor. A system for the preclean may be configured to separate the anhydrous hydrogen fluoride and the water vapor until they are delivered to a common volume near the substrate. Corrosion within components of the system may be limited by purification of anhydrous hydrogen fluoride, passivation of components, changing component materials, and heating components. Passivation may be achieved by filling a gas delivery component with anhydrous hydrogen fluoride and allowing the anhydrous hydrogen fluoride to remain in the gas delivery component to form a passivation layer. Consistent water vapor delivery may be achieved in part by heating components using heaters.

The invention relates to the technical field of sodium hexafluorophosphate production, and particularly discloses a preparation method of high-purity sodium hexafluorophosphate. Comprising six steps of reaction liquid preparation, preliminary reaction, high-temperature reaction, low-temperature reaction, filtering and washing, drying and the like, ammonium hexafluorophosphate and a vacuum-dried sodium source are respectively put into a tetrahydrofuran (THF) solvent, then an ammonium hexafluorophosphate-THF solution is slowly added into a sodium source-THF suspension drop by drop, the sodium source-THF suspension reacts with the ammonium hexafluorophosphate-THF suspension, and the ammonium hexafluorophosphate-THF suspension is obtained. And white powdery sodium hexafluorophosphate is generated under the control of a high-temperature reflux reaction and a low-temperature reaction, so that the technical problem that the risk of preparation safety is relatively high due to the fact that hydrogen fluoride liquid with strong corrosivity is used when the sodium hexafluorophosphate is prepared in the prior art is solved.

The invention belongs to an aluminum fluoride production technology, and particularly relates to a process and a system for producing aluminum fluoride by matching with a low-grade fluorite dry method, fluorite powder and sulfuric acid are added into a pre-reactor to be uniformly mixed and then are guided into a reaction furnace to be heated, and when the reaction furnace rotates, a free spiral structure in the reaction furnace rotates to promote the reaction of the fluorite and the sulfuric acid; discharging the calcium sulfate through a discharging spoon at the discharging end of the reaction furnace, and collecting the hydrogen fluoride volatilized from the reaction furnace; volatilized hydrogen fluoride enters a pre-purification tower and is treated to obtain purified hydrogen fluoride gas, the purified hydrogen fluoride gas and dried aluminum hydroxide are added into a fluidized bed to react to obtain aluminum fluoride and tail gas, and the tail gas enters a tail gas recovery treatment system. The problems that low-grade fluorite is poor in resource utilization rate, prone to crusting in a reaction furnace, low in fluorine utilization rate and the like are solved.

The invention provides a waste photovoltaic module high-value recovery process based on pyrolysis and wet purification, which comprises the following steps: carrying out pyrolysis decarburization on a waste photovoltaic module to obtain a glass plate, a crystalline silicon battery piece and a copper-tin soldering strip; the method comprises the following steps of: performing alkaline leaching on a crystal silicon cell to obtain a dealuminized crystal silicon wafer, performing acid pickling on the dealuminized crystal silicon wafer to obtain a silver-removed crystal silicon wafer and a silver leaching solution, and extracting a silver elementary substance from the silver leaching solution; removing impurities from the silver-removed crystal silicon wafer through a hydrofluoric acid solution to obtain a high-purity crystal silicon wafer; recovering a copper strip from the copper-tin soldering strip through a high-temperature smelting reduction method; after fluorine-containing pyrolysis gas generated in the pyrolysis process is subjected to combustion and heat exchange, hydrogen fluoride is removed in a two-stage alkali liquor absorption mode, then washing is conducted, and finally obtained flue gas is discharged. According to the wet purification process, the waste crystalline silicon battery piece can be subjected to high-purity recovery, and the crystalline silicon piece, silver and copper with high purity can be obtained. The hydrogen fluoride is removed by adopting a two-stage alkali liquor absorption method, so that the treatment efficiency of the hydrogen fluoride in the pyrolysis gas is improved.

The invention relates to the technical field of tail gas treatment, in particular to a hydrogen fluoride preparation tailing acid gas adsorption device and an adsorption method.The hydrogen fluoride preparation tailing acid gas adsorption device comprises a treatment box, a reaction cavity and an adsorption cavity are formed in the treatment box, and a reaction barrel is fixedly installed in the reaction cavity; a stirring shaft is rotatably mounted on the inner wall of the top of the adsorption cavity, a driving motor is arranged at the top of the treatment box, an output shaft of the driving motor extends into the treatment box and is connected with the top end of the stirring shaft, and the bottom end of the stirring shaft extends into the reaction barrel and is fixedly provided with a rotating plate; a rectangular cavity is formed in the rotating plate, an L-shaped hole is formed in the inner wall of the side portion of the rectangular cavity, and a first L-shaped connecting pipe is fixedly arranged in the L-shaped hole. Waste gas can be uniformly guided into all positions in the reaction barrel, the uniform gas guiding function is achieved, a neutralizing agent can make full contact with the waste gas conveniently, and the waste gas treatment function is achieved.

The invention provides a method for detecting oxygen content in copper / copper alloy, and belongs to the technical field of metal component analysis. According to the method for detecting the oxygen content in the copper / copper alloy, the mixed solution of nitric acid, hydrofluoric acid and water is used for cleaning the sample, nitric acid can perform corrosion cleaning on the sample, and when oxide or nitride which is difficult to dissolve by nitric acid exists on the surface of the sample, the oxygen content in the sample is detected by utilizing the characteristic of small molecular radius of hydrogen fluoride. The cleaning agent can rapidly penetrate through a compact metal oxide layer, reacts with metal oxide, destroys and dissolves the metal oxide layer, effectively cleans impurities such as oxide and nitride on the surface of a sample, and is beneficial to improving the accuracy of oxygen content testing. The fluxing agent and the sample are heated and melted together, so that the melting point of copper or copper alloy can be reduced, covalent bonds are destroyed, oxygen release is facilitated, and the detection accuracy is further improved; and the fluxing agent is used, so that the stability of low oxygen content detection is improved, and the detection of lower oxygen content is realized.

A non-woven battery separator and processes for forming the non-woven battery separator includes a fiber blend including cellulose fibers, microfibrillated fibers, and optionally polyester and / or aramid fibers. Also disclosed are batteries including the non-woven battery separator. During fabrication, the non-woven battery separator can be effectively dried at temperatures between 120°C and 180°C, which results in the fibers absorbing water when in use. Some battery electrolytes such as lithium hexafluorophosphate react with water to form hydrogen fluoride (HF), which can be corrosive and shorten battery lifecycles and affect performance. Absorbing water from the electrolyte increases the battery life cycle by reducing HF generation.

The invention relates to the technical field of fireproof plates, and discloses a flame-retardant fireproof plate material and a preparation method thereof. Modified benzoxazine, an aromatic bromine modified phosphate flame retardant, polyvinyl chloride, lignocellulose and calcium carbonate are mixed, stirred, pressed, maintained and cut, and the flame-retardant fireproof plate material is obtained. Nitrogen and oxygen six-membered heterocycles in benzoxazine form a stable compound at a high temperature to prevent flame propagation; the silicon element promotes carbonization of combustion products to form a carbonaceous layer, and a cross-linked network formed by silicon-oxygen bonds improves the mechanical property of the fireproof plate material; a net-shaped structure formed by boron-oxygen bonds has high flame retardance; hydrogen fluoride generated by the fluorine element can interrupt the combustion chain reaction; aromatic bromine generates hydrogen bromide to cover the combustion surface, so that a flame-retardant effect is achieved; a carbonization layer is formed on the surface of the fireproof plate material through polymetaphosphoric acid generated by phosphate, so that a flame-retardant effect is achieved; the aromatic bromine modified phosphate flame retardant plays a plasticizing role in polyvinyl chloride, and the mechanical property of the polyvinyl chloride is improved.

In order to solve the problem that an existing BOE etching solution cannot consider the etching rate, the etching uniformity and the service life of the etching solution at the same time, the invention provides a BOE etching solution which comprises the following components: hydrogen fluoride, ammonium fluoride and a corrosion inhibitor, the corrosion inhibitor comprises a compound shown as a structural formula 1: # imgabs0 # structural formula 1, R1 is selected from substituted or unsubstituted C2-C6 alkyl, and R2 is selected from substituted or unsubstituted C2-C6 ether-containing alkyl. The BOE etching solution provided by the invention has a relatively high silicon oxide / silicon nitride and Si etching selection ratio, can effectively improve the etching uniformity, is beneficial to reducing surface defects, and ensures the flatness and smoothness of an etched surface. In addition, the BOE etching liquid is stable in chemical composition and long in service life.

The invention provides an aluminum electrolyte recycling method which comprises the following steps: (1) mixing an aluminum electrolyte and a leaching agent solution, and carrying out slurrying leaching to obtain slurry and hydrogen fluoride gas; the molar concentration of hydrogen ions in the leaching agent solution is 2.5-25 mol / L; (2) carrying out liquid-solid separation on the slurry obtained in the step (1) to obtain leaching liquid and leaching residues, and carrying out post-treatment on the leaching residues to obtain basic aluminum fluoride; the immersion liquid is reused in the step (1). According to the method, the aluminum electrolyte can be completely dissolved in the strong acid solution under the conditions of high temperature and high pressure, so that the high-purity alkaline aluminum fluoride product is obtained, the recovery rate of aluminum and fluorine resources is high, the immersion liquid can be recycled, the technological process is simple, and the method has a wide application prospect.

The invention belongs to the field of flexible piezoelectric polymer materials, and discloses a polyvinylidene fluoride based ferroelectric polymer and a preparation method thereof. The preparation method comprises the following steps: (1) adding an inorganic alkaline reagent into a polyvinylidene fluoride-trifluoroethylene ferroelectric polymer solution, carrying out dehydrofluorination and nucleophilic addition-elimination reaction to generate a polymer with an enol structure, and then washing, precipitating and purifying a reaction product; and (2) re-dissolving by using an organic solvent, then forming a film by using a tape casting method, and carrying out ketone-enol tautomerization reaction in the film forming process of the tape casting method to finally prepare the polyvinylidene fluoride based ferroelectric polymer film. According to the effective modification and preparation method disclosed by the invention, an enol structure is promoted to be converted into a more stable ketone structure through a ketone-enol tautomerization reaction by utilizing a high-temperature environment in a film forming process, so that C = O double bonds are introduced into a polymer chain, and the piezoelectric property of the polymer is remarkably enhanced.

The utility model relates to the technical field of chemical production, and discloses a hydrogen fluoride reaction furnace gas guide device which comprises a gas inlet pipe, a mounting pipe arranged at the top of the gas inlet pipe, an extension pipe arranged at the top of the mounting pipe, a gas outlet pipe arranged at the top of the extension pipe, and an air supply pipe arranged on one side of the extension pipe and used for supplying air into the extension pipe for cooling, and the water spraying assembly is arranged in the mounting pipe and used for conducting water spraying purification on the gas, the gas is effectively cooled through the water spraying assembly, efficient treatment on the gas is achieved, and the environment-friendly effect and the working efficiency are remarkably improved.

The utility model belongs to the technical field of tail gas treatment of ammonium bifluoride electrolyte batching kettles, and particularly relates to a tail gas treatment system of an ammonium bifluoride electrolyte batching kettle, which comprises a batching kettle, a condenser and a primary water scrubber, the ammonia gas inlet is connected with an ammonia gas supply pipeline, the hydrogen fluoride inlet is connected with a hydrogen fluoride supply pipeline, the condenser is provided with a tail gas inlet, a tail gas outlet and a liquid discharge port, the tail gas inlet is connected with a tail gas discharge port through a first exhaust pipe, and the tail gas outlet is connected with a gas inlet of the first-stage water washing tower through a second exhaust pipe. According to the tail gas treatment system for the ammonium bifluoride electrolyte batching kettle, the condenser is additionally arranged in front of the first-stage water scrubber, hydrogen fluoride gas in tail gas can be liquefied into a liquid phase, nitrogen and ammonia gas in the tail gas are still gas phases at the moment, and therefore the purpose of completely separating hydrogen fluoride in the tail gas can be achieved; the utilization rate of hydrogen fluoride is effectively improved.

The invention discloses a phosphorus trifluoride production device and method, and belongs to the technical field of phosphorus trifluoride production, the device comprises a reaction part, a pretreatment part and a post-treatment part, the reaction part comprises a first raw material tank, a second raw material tank, a reaction kettle and a collection cold trap, the pretreatment part comprises a primary separation tower and an absorption tower, and the post-treatment part comprises a secondary separation tower and an absorption tower. The post-treatment part comprises an adsorption tower, a light component removal tower and a heavy component removal tower; the production method comprises the following steps: adding raw materials of phosphorus trichloride and hydrogen fluoride into a reaction kettle to generate phosphorus trifluoride and hydrogen chloride, collecting the phosphorus trifluoride and hydrogen chloride in a collecting cold trap, heating the collecting cold trap to vaporize the phosphorus trifluoride and hydrogen chloride, and sequentially entering a primary separation tower, a light component removal tower and a heavy component removal tower for a series of treatment, and finally, high-purity phosphorus trifluoride gas is extracted from the heavy component removal tower to a filling system. According to the method, high-purity phosphorus trifluoride with the purity larger than or equal to 99.999% can be finally produced, and the problem that in the prior art, the purity of phosphorus trifluoride is not enough is solved.