1316 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 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.

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 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.

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 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.

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 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.

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 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.

The utility model discloses an electronic-grade hydrofluoric acid production system, industrial hydrofluoric acid is input into the system to obtain high-purity electronic-grade hydrofluoric acid, and the system comprises a graphite evaporator, a rectifying tower and a condenser, the graphite evaporator is provided with a feeding pipeline and a condensed water outlet, and the feeding pipeline is used for inputting industrial hydrofluoric acid into the graphite evaporator; a steam pipeline is further arranged on the graphite evaporator, the other end of the steam pipeline is connected with the rectifying tower, the steam pipeline is used for conveying gas heated by the graphite evaporator into the rectifying tower, and the rectifying tower is used for rectifying and separating hydrofluoric acid gas produced by the graphite evaporator; industrial hydrofluoric acid is added into the graphite evaporator to be heated to obtain hydrofluoric acid, then the hydrofluoric acid is fed into the rectifying tower with a certain height to be distilled, backflow is conducted in proportion, the product quality meets the requirement, and continuous production can be achieved through combination of the graphite evaporator and the rectifying tower; liquid hydrofluoric acid is used as a raw material, high risk of anhydrous hydrogen fluoride gas is avoided, and safety of the system is improved.

The invention discloses a synthetic method of 2,2-difluoromalonate, comprising the following steps: step 1, in a three-necked flask equipped with a tetrafluoro stirring magnet, methyl tetrafluoromethoxy propionate is added, then a catalyst is added, concentrated sulfuric acid is added dropwise, sulfuric acid is added dropwise and stirred at room temperature; step 2, sampling and filtering GC detects the surplus of methyl tetrafluoromethoxy propionate, then the temperature is raised to continue the reaction, and the surplus of the raw material is sampled and detected; step 3, cooling the reaction materials are all put into a vacuum distillation device, fraction, and the content of the product is determined. The present invention reduces the amount of concentrated sulfuric acid to 0.4-0.5 times under the action of catalysts such as silicon-based, silicates, and aluminosilicates, does not produce hydrogen fluoride, can be produced in enamel equipment, is conducive to industrialized production, and the yield is significantly improved at the same time, the yield is 85-95%, and the production process of 2,2-difluoromalonate does not require special equipment, providing a convenient and efficient production process for production.

The invention discloses an efficient thermal cycle drying device for producing flaky ammonium bifluoride, and relates to the technical field of ammonium bifluoride production. Comprising a machine body, an exhaust pipe and an air inlet sleeve, a first shell and a second shell are sequentially mounted at the upper end of the machine body from left to right, an air inlet cavity is formed in the bottom of the inner side of the machine body, and a mounting cylinder is connected to the upper end of the air inlet cavity through a spring; through cooperation of a mounting cylinder, a movable cylinder, a scraping plate and a first adjusting assembly, when materials are subjected to traditional one-way vibration blowing heat exchange, the materials are thrown and turned in the other direction to increase the drying uniformity, meanwhile, the air flow pressure of an exhaust hole is correspondingly adjusted, and the heat exchange drying effect is improved; and through cooperation of the movable barrel and the second adjusting assembly, when materials with the large water content and the large feeding amount are dried, the moving speed of the materials is increased, meanwhile, the air flow pressure of the exhaust holes is correspondingly adjusted, and the heat exchange drying effect is improved.

The invention provides a method for preparing a degradable bone-guided regeneration membrane with an asymmetric membrane layer, which comprises the following steps of: cutting a magnesium metal sheet into a magnesium net or a magnesium bracket with small holes by laser, carrying out heat treatment on the magnesium net or the magnesium bracket by using HF (Hydrogen Fluoride) to obtain a layer of MgF4 coating on the surface, and immersing the magnesium net or the magnesium bracket into a macromolecular solution until a solvent of the macromolecular coating is completely volatilized; then preparing an electrostatic spinning membrane on the surface of the sample: preparing a dense polymer membrane layer containing an antibacterial drug on the surface of the sample close to one side of the fiber tissue by adopting a hot pressing method, or preparing a dense electrostatic spinning ordered fiber membrane which contains an antibacterial nano-drug and is arranged in parallel by adopting an electrostatic spinning method; the designed structure and the used materials can realize an antibacterial function and shield fiber tissues from growing in. The nanofiber membrane which contains osteogenesis promoting substances such as nano-hydroxyapatite or nano-strontium and is conveyed disorderly is prepared on the side close to the bone tissue by adopting an electrostatic spinning technology, and the designed structure and the contained substances can promote osteogenesis.

Provided is a method for etching a silicon nitride film with high accuracy and high selectivity with respect to a silicon oxide film, while preventing deterioration of the shape of a silicon oxide film portion during etching. A dry etching method according to the present invention is used for etching a film structure that is formed in advance on a wafer disposed in a processing chamber, and that is configured such that an end portion of a film layer obtained by laminating a silicon nitride film so as to be vertically sandwiched by silicon oxide films constitutes a side wall of a groove or a hole, in a state in which a gas for processing is supplied into the processing chamber and no plasma is used, wherein: the method comprises (a) a step for reacting a hydrogen fluoride gas at a prescribed temperature to form a reaction layer on the silicon nitride film, (b) a step for channeling a gas of a polar solvent to process the reaction layer formed in step (a), and (c) a step for performing heating at a temperature higher than that in step (a) in a state in which no hydrogen fluoride gas is channeled and volatilizing the reaction layer formed in step (a) and processed in step (b) to remove the reaction layer; and steps (a) to (c) are repeated a plurality of times.

The utility model discloses an ultra-clean high-purity electronic-grade hydrofluoric acid efficient purification device, comprising a distillation tower, a condensation box fixedly installed on the top of the distillation tower, a cavity opened inside the condensation box, an inflation tube installed on the top shell wall of the condensation box, the inflation tubes are evenly distributed on the top outer wall of the condensation box and are connected with the inside of the condensation box, an air bag is arranged on the top of the inflation tube, the air bag is connected with the inflation tube, the air bag is in a flat state in the initial state, a folding hose is connected between every two air bags, and the folding hose is connected with the air bag. With the increase of the amount of hydrogen fluoride gas in the condensation box, the hydrogen fluoride gas enters the air bag and gradually inflates the air bag. The gas will automatically flow to other air bags with less gas through the folding hose, balancing the air pressure in each air bag, and producing a pressure relief buffer effect. Moreover, the air bag changes from flat to full, which can remind the staff that there is too much high-purity hydrogen fluoride gas in the condensation box and collect it in time.

The invention provides a preparation method and a preparation device of a glass through hole, and relates to the technical field of glass preparation. The preparation method comprises the following steps: S1, providing a glass substrate, and carrying out surface pretreatment on the glass substrate; s2, performing prefabricated punching on the target area of the glass substrate by adopting pulse laser so as to form a prefabricated hole in the target area; s3, performing etching and magnetic grinding on the prefabricated hole of the glass substrate; s4, carrying out surface post-treatment on the glass substrate to prepare the glass substrate with a through hole; wherein etching and magnetic grinding are carried out on the prefabricated hole in the step S3, specifically, the glass substrate is soaked in etching liquid for etching, polishing and grinding are carried out on the prefabricated hole through reciprocating motion of magnetic powder in a magnetic field, and the etching liquid is a ternary mixed acid system formed by mixing hydrogen fluoride, hydrogen chloride and nitric acid.

The present disclosure provides a method for more efficiently obtaining HFO-1132(E) and / or HFO-1132(Z) than in conventional methods.The present disclosure specifically provides a method for producing a composition comprising trans-1,2-difluoroethylene (HFO-1132(E)) and / or cis-1,2-difluoroethylene (HFO-1132 (Z)), the method comprising:(x) supplying a starting material gas comprising 1,1,2-trifluoroethane (HFC-143), HFO-1132(E) and / or HFO-1132(Z), and a diluent gas to a reactor containing a catalyst to perform a dehydrofluorination reaction of HFC-143 and an isomerization reaction between HFO-1132(E) and HFO-1132(Z), thereby obtaining a reaction product comprising HFO-1132(E) and HFO-1132(Z), wherein the content of the diluent gas in the starting material gas is 1 to 80 mol %.

The invention discloses a carbon fluoride molecular sieve adsorbent, a preparation method thereof and application of the carbon fluoride molecular sieve adsorbent in purification of electronic-grade fluorine-nitrogen mixed gas. According to the method, a stable passivation layer composed of fluorine-containing chemical bonds is formed on the inner surface and the outer surface of a carbon material through direct fluorination treatment on a carbon molecular sieve. Compared with other fluorination methods, the method has the advantages of higher fluorination degree and lower reaction temperature; meanwhile, the operation is simple, and the thermal stability of fluorine-containing groups on the surface of the treated carbon molecular sieve is good. The fluorinated carbon molecular sieve adsorbent has greatly improved corrosion resistance, can maintain stable adsorption separation performance in gas atmospheres with extremely strong corrosivity, such as fluorine gas and hydrogen fluoride, and is suitable for deep removal of trace oxygen impurities in electronic-grade gas fluorine-nitrogen mixed gas.

The invention relates to a method for preparing methylsulfonyl fluoride from methylsulfonyl chloride, which comprises the following steps: by taking methylsulfonyl chloride as a raw material, adding a fluorination catalyst and anhydrous hydrogen fluoride as a fluorinating agent, and continuously reacting in an HL microchannel reactor to prepare methylsulfonyl fluoride, the HL microchannel reactor is of a three-stage nested microchannel structure, a first-stage mixing area is a conical spiral channel, a second-stage reaction area is a snakelike corrugated channel, and a third-stage extension area is a straight channel. The reaction rate is high, the unit consumption of anhydrous hydrogen fluoride serving as a fluorinating agent is low, the raw material cost is saved, the preparation cost is greatly reduced, and compared with a conventional tank reactor, the HL microchannel reactor is high in reaction rate, convenient to clean, capable of saving manpower, capable of achieving continuous preparation and convenient to achieve large-scale industrialization.

The invention belongs to the technical field of photovoltaic module recycling, and discloses a method for efficiently extracting and recovering valuable components from waste solar cell fragments, which comprises the following steps: firstly, carrying out aluminum removal leaching by using chlorate, then carrying out silver extraction leaching by using a choline chloride / ethylene glycol / water / mixture as a silver leaching solvent, and finally, carrying out high-efficiency recycling on the valuable components. Diluting the silver leaching solution to obtain silver chloride with relatively high purity; and finally, carrying out silicon nitride removal leaching through a hydrogen fluoride solution to obtain a high-purity silicon-containing material. By the adoption of the method, the aluminum removal rate reaches up to 97% or above, the non-silver nitrate leaching solvent is adopted, the purity of obtained silver chloride is larger than 97%, the silicon material with the purity larger than 99% is finally obtained, and efficient, economical and environment-friendly comprehensive extraction and recovery of the waste solar cell fragments are achieved.

The invention discloses a continuous cyclic preparation method of hexafluorophosphate. The method comprises the following steps: S1, preparation of a metal salt anhydrous hydrogen fluoride solution: adding anhydrous hydrogen fluoride and metal halide salt into a reaction kettle, and uniformly mixing, so that the metal halide salt is dissolved in the anhydrous hydrogen fluoride to obtain the metal salt anhydrous hydrogen fluoride solution; s2, preparing a hexafluorophosphate anhydrous hydrogen fluoride solution: adding phosphorus pentachloride into the reaction kettle under a temperature control condition for reaction; a hexafluorophosphate anhydrous hydrogen fluoride solution is obtained; and S3, separation of hexafluorophosphate: transferring the hexafluorophosphate anhydrous hydrogen fluoride solution into a drying tower for drying, condensing gasified anhydrous hydrogen fluoride at the top of the drying tower into liquid anhydrous hydrogen fluoride by a condenser, refluxing the liquid anhydrous hydrogen fluoride into the reaction kettle in the step S1, and collecting a hexafluorophosphate product at the bottom of the drying tower. The continuous cyclic preparation method of hexafluorophosphate has the characteristics of high raw material utilization rate, simple process and good production continuity.