85results about "Fluorine/hydrogen-fluoride" patented technology

The invention relates to a high-temperature acidolysis reaction defluorination method, and belongs to the technical field of phosphorus chemical resource recycling. The technical problem to be solved by the invention is to provide a high-temperature acidolysis reaction defluorination method which is simple to operate and high in defluorination rate. According to the method, phosphorite powder / white fertilizer is subjected to high-temperature acidolysis, fluoride in the phosphorite powder / white fertilizer reacts with strong acid, fluorine is separated from a reaction system in a gas form, and hydrofluoric acid is obtained through condensation. The method is simple, is simple and convenient to operate, and is easy to realize technologized large-scale production. Meanwhile, due to the destructive effect of the strong acid on the lattice structure of the phosphorus-calcium compound, citrate-soluble phosphorus can be converted into soluble phosphate, subsequent phosphorus recovery is facilitated, comprehensive utilization of phosphorite and elimination of white fertilizer output are achieved, meanwhile, the problems of material accumulation and resource waste of enterprises are solved, and the method conforms to the circular economy concept of green development.

The invention discloses a method for producing anhydrous hydrofluoric acid from photovoltaic fluorine-containing waste materials. The waste materials are fluorine-containing solid press filter residues or filter cake biscuits obtained through solid-liquid separation after photovoltaic fluorine-containing waste liquid treatment. The method comprises the following steps: drying, crushing and screening the waste until the waste is matched with the fluorite powder in particle size, returning the oversize product to the crushing, closed-loop granulating and homogenizing; continuously metering and uniformly mixing the homogenized waste and fluorite powder according to a mass ratio of 20: 1 to obtain a mixed fluorine-containing raw material, and continuously feeding the mixed fluorine-containing raw material into a rotary reaction furnace; fuming sulfuric acid and concentrated sulfuric acid are mixed into mixed acid, the mixed acid is continuously added into a reaction furnace, the mixed acid reacts at the temperature of 300-350 DEG C to generate a fluorine-containing gas phase, and reaction heat is indirectly provided by circulation of high-temperature gas in a jacket of the reaction furnace; the crude product gas enters a degassing tower to remove SO2 and SiF4 after being subjected to dust removal, washing, cooling, condensation, rectification, deacidification and dehydration, and an anhydrous hydrofluoric acid product is obtained. According to the method, waste recycling is achieved, and fluorite consumption and waste disposal amount are reduced.

The invention discloses a method for preparing hydrogen fluoride and co-producing fumed silica from low-concentration fluosilicic acid, which belongs to the technical field of inorganic chemical industry and comprises the following steps: concentrating low-concentration fluosilicic acid under reduced pressure; mixing concentrated sulfuric acid with system circulating sulfuric acid, reacting with concentrated fluosilicic acid, and performing gas-liquid separation to obtain mixed liquid of silicon tetrafluoride gas, hydrogen fluoride and sulfuric acid; and washing the separated silicon tetrafluoride gas and / or silicon tetrafluoride gas generated by a wet-process phosphoric acid process with concentrated sulfuric acid, reacting with water vapor, hydrogen and oxygen, and dedusting to obtain the fumed silica. The method has the advantages of simple process flow, low production cost, high product quality, low three-waste output and the like. Besides, low-grade and low-concentration fluosilicic acid is used as a raw material, fluorine and silicon elements are efficiently separated, high-value fumed silica and high-quality hydrogen fluoride are prepared, and good social and economic values are embodied; and cyclic utilization of byproducts such as sulfuric acid reduces environmental pollution and three-waste treatment pressure, and has good environmental protection benefits.

The invention discloses a method for recovering HF (hydrogen fluoride) from hydrofluoric acid waste liquid obtained in an aromatic fluoride industrial synthesis process. According to the HF recovery method provided by the invention, sodium fluoride is taken as a carrier, excessive sodium fluoride reacts with hydrogen fluoride in the hydrofluoric acid waste liquid to generate sodium bifluoride, and HF is released through suction filtration, drying and thermal liberation. The HF is subjected to adsorption-desorption circulation through NaF, so that the purpose of recycling HF without discharging three wastes is achieved; meanwhile, the filtrate returns to the aromatic fluoride industrial synthesis process to be recycled as an absorbent of diazonium salt pyrolysis tail gas; the obtained sodium fluoride is recycled as an HF adsorbent, so that the effect of recycling multiple resources is achieved.

The utility model discloses a sealing device of a hydrogen fluoride reaction furnace, which belongs to the technical field of hydrogen fluoride processing and particularly comprises a hot air jacket and a furnace tail, and a graphite block sealing mechanism is arranged at the joint of the hot air jacket and the furnace tail. The graphite block further comprises an elastic pressing mechanism, the elastic pressing mechanism comprises fixing frames, a longitudinal elastic piece and a transverse elastic piece, the fixing frames are fixedly connected to the hot air jacket, one end of each fixing frame is located above the graphite block body and fixedly connected with the graphite block body, a pressing plate is movably connected between every two adjacent fixing frames, and the longitudinal elastic piece is fixedly connected with the transverse elastic piece. The pressing plate is connected with the two adjacent fixing frames through a longitudinal elastic piece, and the pressing plate is connected with a hot air jacket through a transverse elastic piece; through the arrangement of the transverse elastic piece, elastic force pointing to the section of the hot air jacket can be provided for the graphite block body, and the possibility that gas leaks between the graphite block body and the section of the hot air jacket is further reduced.

The invention provides an anhydrous hydrogen fluoride desulfurization reaction device, and relates to the technical field of anhydrous hydrogen fluoride preparation, the device comprises a reaction container, the reaction container is internally provided with a first accommodating cavity, and the reaction container is provided with a first feed port, a second feed port and a discharge port which are communicated with the first accommodating cavity; wherein the first feeding hole is used for conveying a liquid catalyst for sulfur removal into the first accommodating cavity, and the second feeding hole is used for outputting sulfur-containing hydrogen fluoride gas from the bottom of the first accommodating cavity; and the height of the discharge port is greater than that of the first feed port so as to discharge the sulfur-removed hydrogen fluoride gas. The method can deeply remove sulfur in anhydrous hydrogen fluoride production, and can avoid influence on production continuity and safety.

The utility model relates to the technical field of production capacity of hydrogen fluoride evaporation systems, in particular to hydrogen fluoride evaporation equipment which comprises a shell pass, a tube pass upper tube box and a tube pass lower tube box, the shell pass comprises a shell pass saturated evaporation section and a shell pass superheat section which are communicated, heat exchange tubes are arranged in the shell pass saturated evaporation section and the shell pass superheat section, and the shell pass upper tube box and the shell pass lower tube box are communicated. The tube pass upper tube box and the tube pass lower tube box are communicated through the heat exchange tube; a hydrogen fluoride inlet is formed in the bottom of the shell pass saturation evaporation section; and a hydrogen fluoride gas outlet is formed in the top of the shell pass overheating section. The hydrogen fluoride evaporation tank overcomes the defects of a traditional hydrogen fluoride evaporation tank, provides a safer and more efficient mode to improve the evaporation and supply capacity of hydrogen fluoride, meets the requirements of an existing process, reduces the storage amount of hydrogen fluoride, reduces steam consumption, improves the production efficiency and reduces the safety risk level.

The application discloses a method for recovering fluorine and triethylamine from fluorine-containing organic wastewater, and belongs to the technical field of fluoride preparation. The method adopts the synergistic effect of an organic phase of an extractant A and an extractant B under the condition that the pH is 0.5-4, realizes selective extraction of fluorine ions and inhibition of extraction of metal impurity cations under the premise that water-soluble triethylamine is not extracted through a one-step liquid-liquid extraction process, thereby realizing efficient and low-loss recovery of fluorine and triethylamine, and further preparing high-purity fluorides and triethylamine. The method has the advantages of short process, no need of complicated impurity removal process, high fluorine recovery rate, low production cost and the like.

The utility model provides a crude distillation tower for preparing hydrogen fluoride, which comprises a crude distillation tower I and a crude distillation tower II, and further comprises a fixed shell I, and the fixed shell I is arranged on the upper side and the lower side of the crude distillation tower I and the crude distillation tower II. An electric push rod drives a first push rod and a second push rod to move, the first push rod and the second push rod move a blocking frame to move, blocking and opening of a first coarse distillation tower and a second coarse distillation tower are facilitated, and therefore conversion of coarse distillation working areas between the first coarse distillation tower and the second coarse distillation tower is well carried out; the coarse distillation tower is plugged through the plugging frame and the plugging block, so that the plugging effect of the plugging structure on the coarse distillation tower is better, the coarse distillation tower I and the coarse distillation tower II can be switched between coarse distillation working areas, the coarse distillation work of the whole coarse distillation tower is not influenced while the maintenance work is better and conveniently carried out, and the maintenance efficiency is improved. And the overall working efficiency is improved.

The invention belongs to the technical field of fluosilicic acid utilization, and relates to a potassium fluosilicate decomposition method and application of the potassium fluosilicate decomposition method in preparation of hydrogen fluoride from fluosilicic acid. The method comprises the following steps: firstly, mixing an auxiliary agent with ammonia water, then mixing with potassium fluosilicate to form a decomposition system, adjusting the temperature of the decomposition system to 20-70 DEG C, stirring the decomposition system, simultaneously applying ultrasonic waves, and reacting for 5-10 hours to realize decomposition of potassium fluosilicate. In addition, solid potassium fluosilicate is obtained by adding soluble potassium salt into fluosilicic acid; the potassium fluosilicate is decomposed to obtain a fluoride salt solution, the fluoride salt solution is heated to expel ammonia and then reacts with fluosilicic acid to obtain an ammonium fluoride solution, the ammonium fluoride solution reacts with soluble calcium salt to obtain calcium fluoride solid, and the calcium fluoride solid reacts with concentrated sulfuric acid to obtain hydrogen fluoride. The potassium fluosilicate decomposition method can solve the problem that reaction raw materials are wrapped by reaction products, the raw material utilization rate and the product yield are remarkably improved, and the potassium fluosilicate decomposition method can shorten the technological process and reduce the production cost when applied to preparation of hydrogen fluoride from fluosilicic acid.

The invention relates to the technical field of chemical production, and discloses a deep impurity removal technology and device in the hydrofluoric acid production process, the device comprises a bottom plate, an input pipe and a connecting pipe, metal ions in hydrofluoric acid are pretreated through a filter element, the load of a follow-up deep impurity removal module is reduced, hydrofluoric acid is pumped into a low-pressure tower, and the impurity removal efficiency is improved. HCl-SiF mixed liquid obtained through condensation of a condenser is input into a waste liquid tank, a tower bottom liquid phase enters a high-pressure tower, hydrofluoric acid is heated and pressurized to volatilize into a gas phase, the gas phase is input into a liquid storage tank through condensation of the condenser, and a pressure difference transmitter matched with the filter element automatically monitors the pressure difference of an inlet and an outlet of the filter element and automatically cleans the filter element to avoid blockage of the filter element. Metal ions in hydrofluoric acid are removed through resin in the cation column, chloride ions in hydrofluoric acid are adsorbed through the anion column, and regeneration of the cation column and the anion column is achieved by switching to standby resin, introducing a hydrogen chloride solution into the failed cation column and introducing a hydrofluoric acid solution into the anion column.

This invention relates to the field of lithium salt synthesis technology for lithium-ion battery electrolytes, specifically a method for synthesizing lithium hexafluoroarsenate. This method uses 40% hydrofluoric acid as the reaction medium, replacing high-cost anhydrous hydrofluoric acid, and adds 0.5-5 wt% fluoride catalyst. It employs a segmented temperature control mode of mixing at -40 to -30°C, aeration at 20 to 30°C, and heat preservation at 40 to 50°C. Combined with a reactor with a built-in annular baffle plate to improve mixing efficiency, the highly toxic exhaust gas is treated by a three-stage tail gas absorption system of anhydrous calcium chloride-20% sodium hydroxide solution-activated carbon. Simultaneously, it achieves resource recovery of fluoride-containing wastewater through lime slurry pretreatment-sulfuric acid regeneration and hydrofluoric acid recycling. This invention features a safe process operation, reduces costs by more than 30%, produces a product purity ≥99.9%, a yield ≥92%, achieves a fluoride resource recovery rate of ≥85% in wastewater, and meets national standards for tail gas emissions. It realizes efficient and green synthesis of lithium hexafluoroarsenate and is suitable for industrial production.

The utility model provides a kind of for anhydrous hydrogen fluoride anion removal's feeding device, it is related to anhydrous hydrogen fluoride preparation technical field, including the reaction tank with stirring assembly inside being provided, and the feeding mechanism of adding lime powder inside reaction tank, reaction tank mouth is provided with the tank cover of sealing installation, feeding mechanism includes the feed bin being set on the tank cover, the feeding tray being set in the position of tank mouth, and the feeding control component being set on feeding tray;Lime powder is placed in feed bin, and control lime powder is added to feeding tray, and feeding control component controls lime powder evenly added on the hydrogen fluoride mixed solution liquid level in reaction tank.The utility model is convenient for evenly mixing lime powder in hydrogen fluoride mixed solution, avoids the emergence of the situation that local concentration of lime powder in solution is too high or high and low, improves the anion removal effect in hydrogen fluoride mixed solution.

The invention discloses a fluorine preparation electrolyte resource regeneration method which comprises the following steps: S1, putting waste electrolyte into a dissolution regeneration reaction device, introducing steam for heating, and introducing potassium hydroxide and mother liquor into the dissolution regeneration reaction device for reaction to obtain an electrolyte solution; s2, directly discharging the reacted electrolyte solution downwards into a regeneration filtering device for filtering; s3, the filtered electrolyte solution is input into a regeneration low-temperature crystallization device through a flow pump to start crystallization, crystallized particles are precipitated at the bottom of the regeneration low-temperature crystallization device, and then mother liquor is independently pumped out; s4, sediment at the bottom of the regeneration low-temperature crystallization device is introduced into a centrifugal machine for solid-liquid separation, separated mother liquor and mother liquor during crystallization are conveyed back to the step S1, and separated solids are collected into a drying chamber; and S5, drying is conducted in a drying chamber, and bagging is conducted after inspection is qualified. Manual intervention is not needed in the whole process, the whole automation degree is high, and automatic feeding and discharging can be achieved.

The invention discloses a process and a device for preparing hydrogen fluoride by a fluosilicic acid complexing method. The process comprises the following steps: mixing a fluosilicic acid solution, a complexing solution and a cross-linking agent to generate a complexing reaction to obtain a first mixed material containing a metastable state complex; raising the temperature of the first mixed material to be stable, so as to obtain a second mixed material containing a solid-phase steady-state complex; and carrying out solid-liquid separation on the second mixed material, drying the solid, and carrying out thermal decomposition to obtain hydrogen fluoride gas, silicon tetrafluoride gas and a liquid material. The device comprises complex reaction equipment, cross-linking reaction equipment, first solid-liquid separation equipment, a drying machine and complex decomposition equipment. The complexing agent can be recycled for a long period and has the advantages of being high in separation efficiency, small in fluosilicic acid loss, high in hydrogen fluoride yield, low in material consumption and energy consumption and the like, and on the basis that a hydrogen fluoride product reaches superior product indexes, the fluosilicic acid complexing rate reaches 98% or above, the complex decomposition rate reaches 95% or above, and the total hydrogen fluoride yield reaches 90% or above.

The application discloses a method for preparing G5-grade electronic-grade hydrofluoric acid by adopting potassium permanganate-hydrogen peroxide two-step oxidation and reduction, which comprises the following steps: potassium permanganate pre-oxidation, hydrogen peroxide reduction post-treatment and rectification purification.The application has the beneficial effects that: the application provides a method for preparing G5-grade electronic-grade hydrofluoric acid by adopting potassium permanganate-hydrogen peroxide two-step oxidation and reduction, trivalent arsenic is efficiently converted into pentavalent arsenic by potassium permanganate pre-oxidation, residual oxidants are completely eliminated by hydrogen peroxide reduction, and finally, high-purity products meeting SEMI C5 standards, which have an arsenic content of less than 10 ppt, are obtained by rectification, the production cost is greatly reduced, the storage and use risks of toxic fluorine gas are effectively avoided, meanwhile, the method has the outstanding advantages of mild process conditions, simple operation, low equipment investment, environmental friendliness and the like, the safety, economy and product quality are comprehensively improved, and the method has good industrial application prospects.

The present application relates to the field of anhydrous hydrogen fluoride production, and particularly relates to a method for preparing hydrogen fluoride by decomposing multi-components with fluosilicic acid and alkali. The method comprises the following steps: alkali decomposition reaction, preparation of white carbon black, preparation of calcium fluoride, recovery and circulation of anhydrous hydrogen fluoride, and regeneration and compounding of alkali decomposition agent. In the method, the fluosilicic acid is first decomposed with multi-components to convert into potassium fluoride solution, and then reacts with calcium sulfate and calcium hydroxide to generate fluorite, and the fluorite reacts with sulfuric acid solution to generate hydrogen fluoride gas, so that the calcium sulfate is completely recycled, the hydrogen fluoride is washed, condensed and rectified to obtain anhydrous hydrogen fluoride; the supercritical CO2 drying technology is introduced to co-produce high-specific-surface white carbon black, so that the agglomeration is avoided and the process flow is simplified; and the alkali decomposition agent can be recycled and regenerated for use, without by-product discharge.

The invention relates to a method for obtaining hydrofluoric acid from an electrolyte of a lithium-ion battery. The method comprises the steps (a) thermal treatment of the electrolyte to obtain phosphorus pentafluoride; (b) Contacting phosphorus pentafluoride with an absorbent to obtain a first solution containing hydrofluoric acid and phosphoric acid, wherein the first solution additionally contains monofluorophosphoric acid and / or difluorophosphoric acid; (c) Reaction of monofluorophosphoric acid and / or difluorophosphoric acid with an inorganic base to obtain a fluoride and a phosphate; and (d) Contacting the fluoride with a cation exchanger to convert the fluoride into hydrofluoric acid.

The utility model relates to fluorine chemical industry technical field, concretely relates to a hydrogen fluoride gas heat exchange device. The hydrogen fluoride gas heat exchange device, include: primary heat exchanger, first production pipeline in primary heat exchanger is communicated with the purification tower, primary heat exchanger has first liquid outlet, first liquid outlet is communicated with first production pipeline, still be provided with first heat exchange pipeline in primary heat exchanger, and the export of first heat exchange pipeline is communicated with rectifying column, crude acid tank, crude acid tank is communicated with first liquid outlet through first liquid pipeline, and crude acid tank is communicated with first heat exchange pipeline through crude acid circulating pipeline. The hydrogen fluoride liquid in crude acid tank is used as refrigerant and hydrogen fluoride gas to carry out heat exchange, can effectively save a part of refrigerant, reduce enterprise cost and burden, simultaneously, the hydrogen fluoride liquid after heat exchange sublimes into hydrogen fluoride gas, can carry out secondary impurity removal, still can reduce the steam consumed when heating hydrogen fluoride liquid, further reduced enterprise cost.

The utility model discloses a titanium gold acid regeneration system equipment belongs to acid regeneration equipment technical field, including setting gradually: the original acid tank, the original acid tank is used to store acid wastewater, the perfluorinated cooler, perfluorinated cooler is connected with original acid tank intercommunication, is used to cool acid wastewater, the reaction tank, the reaction tank is connected with perfluorinated cooler intercommunication, is used to acid wastewater and reagent reaction produces the regenerated acid, centrifuge, centrifuge is connected with perfluorinated cooler intercommunication, is used to separate the regenerated acid, the new acid tank, the new acid tank is connected with centrifuge intercommunication, is used to store the regenerated acid, the utility model discloses the acid wastewater in original acid tank through the feed pump enters perfluorinated cooler and reaches the required temperature after cooling, reaches the reaction tank and reagent reaction produces the regenerated acid again, transports the solution in the reaction tank to centrifuge, and the centrifuge separates the qualified regenerated acid and is collected and stored through the new acid tank, realizes the acid liquid regeneration of systematization, is suitable for industrial production.

The invention discloses a silicon tetrafluoride resource utilization method, and relates to the field of silicon tetrafluoride resource utilization. The method comprises the following steps: S1, introducing silicon tetrafluoride into an ammonium bifluoride solution, and filtering to obtain ammonium fluosilicate precipitate and first filtrate; s2, adding a desilicication precipitator into the first filtrate, and filtering to obtain fluosilicate precipitate and second filtrate; s3, mixing the second filtrate with concentrated sulfuric acid, heating, evaporating and analyzing, absorbing the obtained gas with water to obtain hydrofluoric acid, and crystallizing and separating out the residual liquid to obtain ammonium salt. The whole process route is mild in reaction condition and high in safety coefficient; high temperature and external electric field are not needed, and energy consumption is low; no secondary waste is generated, and the comprehensive utilization degree of resources is high.

The invention relates to a method and a device for purifying crude nitrogen trifluoride gas, and belongs to the technical field of nitrogen trifluoride gas purification, and the method comprises the following steps: sequentially carrying out preheating, cracking, hydrogen fluoride washing, reduction, alkali washing, water ring pressurization, water removal and secondary rectification on nitrogen trifluoride electrolytic gas prepared by adopting an electrolytic method. According to the method, the high-purity nitrogen trifluoride gas with the purity of 99.995 vol% or above can be obtained, and the method is safe to operate, low in cooling medium consumption and low in energy consumption; the device comprises a preheater, a cracking tower, a buffer tank, a hydrogen fluoride washing tower, a reduction tower, an alkaline washing tower, a water ring compressor, water removal equipment, a rectification system and a filling system, and the method and the device are simple in structure, high in operation safety, strong in operability, low in operation cost, suitable for large-scale production and wide in application prospect.

The utility model relates to hydrogen fluoride processing technical field discloses a kind of sulfuric acid cooling device for hydrogen fluoride production, comprising: sulfuric acid absorption tank, the import of sulfuric acid absorption tank is connected with the lower end outlet of sulfuric acid absorption tower, and sulfuric acid absorption tank is used to store sulfuric acid solution;Cooler carries out cooling to sulfuric acid;The import of drive pump is communicated with the export of sulfuric acid absorption tank, and the export of drive pump is connected with the import of cooler first cooling chamber by first pipeline;The export of cooler is communicated with the import of upper end of sulfuric acid absorption tower, and the sulfuric acid of cooler export is re-sprayed to downward by the upper end import of sulfuric acid absorption tower and absorbs hydrogen fluoride, the utility model sulfuric acid enters into sulfuric acid absorption tank, and sulfuric acid in sulfuric acid absorption tank is entered into cooler by drive pump, and the temperature of sulfuric acid is reduced to suitable temperature by cooler, then re-enters into sulfuric acid absorption tower, ensure that sulfuric acid is in the optimum absorption temperature range, effectively promote the absorption efficiency of hydrogen fluoride.

The invention provides a treatment method of tail gas containing phosphorus pentafluoride and a preparation method and device of lithium hexafluorophosphate. The treatment method of the tail gas containing phosphorus pentafluoride comprises the following steps: 1) carrying out first absorption treatment on the tail gas containing phosphorus pentafluoride by adopting a first absorption liquid containing lithium fluoride to obtain a first lithium hexafluorophosphate solution and a first mixed gas containing hydrogen fluoride; 2) carrying out first reaction on phosphorus pentachloride and the first mixed gas to obtain second mixed gas containing phosphorus pentafluoride; and 3) carrying out second absorption treatment on the second mixed gas by using a second absorption liquid containing lithium fluoride to obtain a second lithium hexafluorophosphate solution and a third mixed gas containing hydrogen fluoride and hydrogen chloride. According to the treatment method of the tail gas containing phosphorus pentafluoride, provided by the invention, the content of phosphorus pentafluoride in the tail gas can be reduced, and the resource utilization rate is improved.

The application discloses a kind of low metal impurity hydrofluoric acid and preparation method thereof, it is related to fine chemicals technical field.Preparation method includes: industrial anhydrous hydrogen fluoride is dried by adsorption, HF gas is obtained after vaporization;Then HF gas is mixed with oxygen and then plasma oxidation is carried out, then it is adsorbed into fixed bed adsorption tower filled with multistage modified chelating resin, then multi-effect coupling rectification is carried out, finally it is absorbed with ultrapure water, and low metal impurity hydrofluoric acid is obtained.Multistage modified chelating resin is prepared by imino diacetic acid chelating resin through aluminum loading, titanium loading and functional group grafting modification.The application realizes the deep removal of polyvalent metal ions by the synergistic effect of plasma oxidation and multistage modified chelating resin adsorption, combined with multi-effect coupling rectification, the metal impurity content of product is as low as ppt level, the process is stable and controllable, and is suitable for microelectronics, semiconductor and other high-end manufacturing fields.

The present disclosure provides a hydrogen fluoride preparation method, hydrogen fluoride, and a battery material. The preparation method comprises the following steps: reacting a fluorosilicic acid solution with a sulfuric acid solution to obtain a mixed gas and a fluorine-containing sulfuric acid, wherein the content of hydrogen fluoride in the mixed gas is 10%-20%, and the content of hydrogen fluoride in the fluorine-containing sulfuric acid is 90%-80%; performing concentrated sulfuric acid treatment on the mixed gas to obtain sulfuric acid having absorbed the hydrogen fluoride; performing falling film evaporation treatment on the fluorine-containing sulfuric acid to obtain a hydrogen fluoride-containing gas phase; and washing the hydrogen fluoride-containing gas phase with the sulfuric acid having absorbed the hydrogen fluoride, to obtain hydrogen fluoride gas.

The invention discloses a device and a method for preparing hydrogen fluoride by a complex decomposition method. The device comprises a cascade reactor, a dryer and a circulation type dynamic thermal decomposition system which are connected in sequence, the cascade reactor integrates functions of complexation reaction, complex filtration and cross-linking reaction, and comprises a complexation reaction area, a membrane filtration area and a cross-linking reaction area which are sequentially arranged from top to bottom; lateral stirring is carried out in the complexing reaction zone; a filtering membrane pipe is arranged in the membrane filtering area; an inner cavity of the filter membrane tube is communicated with the complexation reaction zone and the cross-linking reaction zone, and an outer cavity is used for receiving filtrate; the cross-linking reaction zone is an ultrasonic reaction zone; the dryer is connected with the bottom of the cross-linking reaction area and is used for drying a solid complex which is cross-linked in the cross-linking reaction area; and the circulation type dynamic thermal decomposition system is used for fluidizing the solid complex dried by the circulation type dynamic thermal decomposition dryer and discharging hydrogen fluoride-containing gas.

The utility model belongs to fluorine chemical industry technical field especially relates to a hydrogen fluoride recovery production device, including the dehydrofluorination kettle, primary condenser, secondary condenser, hydrogen fluoride receiving tank, hydrogen fluoride dehydrofluorination kettle and tail gas absorption device that are sealed and connected in proper order through pipeline, a plurality of stirring paddles are arranged in the dehydrofluorination kettle, the dehydrofluorination kettle outside is provided with steam jacket, primary condenser is connected with the dehydrofluorination kettle top, secondary condenser is connected with primary condenser export, hydrogen fluoride receiving tank is connected with primary condenser and secondary condenser, hydrogen fluoride receiving tank outside is provided with brine jacket, hydrogen fluoride measuring tank is connected with hydrogen fluoride receiving tank, tail gas absorption device is connected with secondary condenser. The utility model makes excess HF from the organic phase volatilization, through the high -efficient liquefaction recovery of primary and secondary condenser, has improved the recovery rate, has reduced HF waste significantly, has reduced raw material unit consumption, has reduced waste acid emission from the source.