150 results about "Hydrogen bromide" patented technology

The invention relates to a method for extracting bromine from a bromine-containing water sample through electrooxidation, in particular to a method for extracting bromine from brine containing various impurity ions, especially high-concentration Cl <-> ions and low-concentration Br <-> ions, which is mainly used for reducing the interference of the Cl <-> ions and improving the recovery rate of the Br <-> ions by selecting a proper oxidation potential. The process is used for optimally selecting the oxidation potential of bromine ions so as to achieve high-recovery-rate bromine extraction, and comprises the following steps: 1) adjusting the pH value of a bromine-containing water sample to be acidic; 2) carrying out electrochemical oxidation on the bromine-containing water sample subjected to acid adjustment to convert bromine ions into bromine gas; and 3) blowing the generated bromine gas to the absorption device through the aeration device. The hydrogen bromide solution is introduced to adjust the pH of the absorption product solution to be acidic, so that bromate is converted into bromide, and finally, a high-quality sodium bromide product can be obtained.

A process for producing propylene and hydrogen from propane, the process comprising the steps of: a) reacting a mixture comprising propane and bromine to produce a first reaction mixture comprising bromopropane and hydrogen bromide, b) subjecting the first reaction mixture obtained in step a) to at least one separation step to obtain a bromopropane-rich composition and to obtain a hydrogen bromide-rich composition, c) subjecting the bromopropane-rich composition obtained in step b) to a catalytic reaction to produce a second reaction mixture containing propylene and hydrogen bromide, d) subjecting the second reaction mixture obtained in step c) to at least one separation step to obtain a hydrogen bromide-rich composition and to obtain propylene, and e) subjecting the hydrogen bromide-rich composition obtained in step b) and / or the hydrogen bromide-rich composition obtained in step d) to electrolysis to obtain hydrogen and a bromine-containing composition, wherein preferably at least a portion of the bromine-containing composition is recycled back to step a).

The invention belongs to the technical field of electrochemical energy storage, and discloses an electrolyte for a zinc-bromine flow battery, a preparation method of the electrolyte and the zinc-bromine flow battery, raw materials of the electrolyte comprise the following components: zinc salt, potassium salt, an additive and a solvent; the potassium salt is a compound mixture of potassium bromide and potassium bromate; the additive comprises an organic complexing agent and an inorganic corrosion inhibitor; wherein the organic complexing agent comprises an organic zinc complexing agent and an organic bromine complexing agent; the organic zinc complexing agent is crown ether; the organic bromine complexing agent is imidazole bromine salt or pyridine bromine salt; the inorganic corrosion inhibitor is a compound of sodium molybdate, zinc sulfate, sodium dihydrogen phosphate and deionized water; growth of zinc dendrites can be remarkably inhibited, the energy density of the battery is improved, and escape of hydrogen bromide is effectively prevented, so that the performance and the stability of the zinc-bromine flow battery are comprehensively improved, the service life of the battery is prolonged, and the use cost and the safety risk of the battery are reduced.

The invention discloses a preparation process of 2-bromoheptafluoropropane, which takes heptafluoropropane as a raw material to carry out bromination reaction, specifically, hydrogen on a No.2 carbon atom is substituted by bromine to generate 2-bromoheptafluoropropane, and hydrogen bromide is generated at the same time. And hydrogen bromide is absorbed by water and then is treated by liquid caustic soda to generate sodium bromide.

The invention belongs to the technical field of fine chemical synthesis, belongs to a nonionic short fluorine chain surfactant, and relates to a preparation method of a fluorinated polyether surfactant. The preparation method comprises the following steps: reacting trimethylolethane with a hydrogen bromide acetic acid solution to prepare an intermediate 1; reacting the intermediate 1 in an alkaline environment without an organic solvent to prepare an intermediate 2; reacting the intermediate 2 with pentafluoropropanol under the action of potassium hydroxide and a catalyst 1 to prepare a fluorinated monomer; finally, the fluorinated monomer is subjected to ring opening polymerization under the action of an initiator and a catalyst 2, and the fluorinated polyether type surfactant is prepared. The method has the advantages of easily available raw materials, mild reaction conditions, simple synthesis, low cost, high yield and short fluorine chain of the product, can replace a long-chain fluorine-containing surfactant which is difficult to degrade, and can be used as an additive in the fields of photoresists, coatings, adhesives and the like. The surface tension can be obviously reduced, the surface defects of a coating can be reduced, and the appearance can be improved by adding a very small amount of the surface tension reducing agent.

A method for removing organobromine compound and refining copper from a recycled material containing copper and an organobromine compound includes the steps of: subjecting the recycled material containing the copper and the organobromine compound to low-temperature pyrolysis to recover hydrogen bromide and a crude copper powder; subjecting the hydrogen bromide to a reaction with a metal oxide to form an inorganic compound; subjecting the crude copper powder to a melting treatment to recover a molten mixture containing liquid copper and impurities; and adding a refining agent to the molten mixture to allow the impurities in the molten mixture and the refining agent to form a slag phase layer, followed by removing the slag phase layer, thereby recovering the liquid copper.

The application discloses a high-purity electronic-grade hydrogen bromide metal ion impurity control device and a control method. The device comprises an adsorption column, a bag-type dust collector and a rectifying tower. First impurity removal mechanisms are arranged at the upper end of the adsorption column and the top of the rectifying tower to remove gas-phase metal impurities. Second impurity removal mechanisms are arranged at the tower kettle of the rectifying tower to remove liquid-phase metal impurities. The bag-type dust collector comprises a flow channel, a keel frame and dust removal bags. Third impurity removal mechanisms are arranged on the flow channel. The dust collector device of metal ions is added to the existing process system, and the structure is designed to realize solid-liquid separation of liquid to intercept metal particles. The structures of the adsorption equipment and the rectifying equipment are designed to remove gas-phase metal impurities and liquid-phase metal impurities, thereby increasing the removal efficiency and effect of metal particles.

The invention belongs to the technical field of medicinal chemistry, and relates to a novel small nucleic acid drug intermediate and a preparation method thereof, the intermediate is a 2 '-FANA-dU phosphoramidite monomer, the preparation method comprises the following steps: 1, reacting a compound a with a 33% hydrogen bromide-acetic acid solution in dichloromethane, and performing post-treatment to obtain a compound b; 2, reacting uracil and the like to generate a white solid, and reacting the white solid with the compound b to obtain a compound c; 3, reacting the compound c in methanol and ammonia water, crystallizing and drying to obtain a compound d; 4, the compound d reacts with 4, 4 '-dimethoxytriphenylchloromethane, and a compound e is obtained through treatment; 5, the compound e reacts with anhydrous diisopropyl imidazole and a 2-cyanoethyl-N, N, N ', N'-tetraisopropyl phosphoramidite reagent, and the 2 '-FANA-dU phosphoramidite monomer is obtained.The 2'-FANA-dU phosphoramidite monomer prepared through the method can modify siRNA, the biological activity of the siRNA can be reserved or even enhanced, and the biological stability of the siRNA can be remarkably improved.

The present invention provides a method for preparing 3,4-difluorobromobenzene, belonging to the technical field of fine chemical industry. Using 1,2-difluorobenzene as the raw material and solvent, and silica gel supported Lewis acid as the catalyst, bromine is added dropwise while heating up to obtain part of 3,4-difluorobromobenzene. Meanwhile, the generated hydrogen bromide is converted into bromine by an oxidant and continues to be added dropwise, and the product is obtained by rectification to get 3,4-difluorobromobenzene. The present invention uses a catalyst to reduce the generation of isomers; by setting the first / second reaction kettle, the inactivation of the catalyst is avoided, and at the same time, the bromine utilization rate is improved; by selecting an oxidant, the oxidation efficiency is improved, the storage risk is reduced, and the possibility of product pollution is reduced. The bromine utilization rate of the present invention can reach 92%, the product purity can reach 99.7%, and the yield can reach 85.5%.

The invention discloses a method for preparing pyridine hydrobromide using pyridine hydrochloride mother liquor, belongs to the technical field of pyridine hydrochloride, and is characterized in that it comprises the following steps: adding purified water to pyridine hydrochloride mother liquor, stirring and standing the mixed solution to be layered, and obtaining a lower layer solution; adding calcium hydroxide solution to the lower layer solution, adjusting the pH to neutral, and adding a phase transfer aid to saturation, stirring and standing the mixed solution to be layered, and obtaining an upper layer of recovered pyridine solution; passing hydrogen bromide gas into the recovered pyridine solution, and collecting the reaction solution; the reaction solution is decolorized, concentrated, cooled, crystallized and dried to obtain pyridine hydrobromide. The beneficial effects of the invention are: the mother liquor produced in the production process of pyridine hydrochloride, creatively introduces a phase transfer aid as calcium chloride, and the overall recovery rate of pyridine is increased from 50% to 90%.

This utility model belongs to the technical field of hydrogen bromide gas drying towers, specifically a hydrogen bromide gas drying tower with replaceable packing, including a drying tower body, a protective net, and an installation mechanism. The protective net is installed on the outer wall of the drying tower body. The installation mechanism includes an installation shell, filter plates, and a fixing shell. The installation shell is located inside the drying tower body; an installation groove is formed on the inner wall of the installation shell; the filter plates are respectively installed inside the corresponding installation grooves; and the fixing shell is located inside the installation shell. This utility model places the fixing shell inside the installation shell, and then installs the filter plates into the corresponding installation grooves. A partition plate can divide the interior of the installation shell into multiple independent spaces for replacing and classifying different types of packing.

The present invention relates to the field of production wastewater oxidation recovery, and specifically to a production wastewater oxidation recovery device, comprising an evaporation box, an evaporation assembly being provided in the evaporation box, and a condensation assembly being provided at an upper port of the evaporation box; the evaporation assembly comprising a rotating shaft horizontally arranged across the evaporation box, a wheel body being coaxially fixedly connected to the middle position of the rotating shaft, and a plurality of arc-shaped evaporation plates being provided on the surface of the wheel body; in the present invention, the wheel body is designed to stir hydrogen bromide wastewater and an oxidant, hydrogen peroxide, continuously during rotation, thereby ensuring full contact between the oxidant and the wastewater and improving the oxidation reaction efficiency of the hydrogen bromide and hydrogen peroxide; and simultaneously, as the wheel body continuously rotates, each evaporation plate can be continuously rotated out of the mixed liquid. After being carried out, the evaporation plate can quickly heat and evaporate the elemental bromine solution on the evaporation plate, thereby significantly improving the evaporation effect.

The invention relates to the technical field of preparation of fluorine-containing organic intermediates, in particular to a method for preparing 2-bromoheptafluoropropane through photothermal conversion. The method comprises the following steps: respectively vaporizing, mixing and preheating heptafluoropropane and bromine, introducing into a photo-thermal reactor, carrying out bromination reaction to obtain mixed gas containing 2-bromoheptafluoropropane, introducing the mixed gas containing 2-bromoheptafluoropropane into a fluorine removal device containing silicon dioxide, carrying out fluorine removal reaction, washing with water, carrying out alkali washing, dehydrating, compressing, condensing, carrying out two-stage rectification, and drying to obtain 2-bromoheptafluoropropane. The high-purity 2-bromoheptafluoropropane is obtained. According to the method, hydrogen fluoride is removed from the mixed gas containing 2-bromoheptafluoropropane through a fluorine removal reaction, hydrogen bromide is removed through water washing, alkali washing and dehydration, impurities are removed through secondary rectification, finally, the high-purity 2-bromoheptafluoropropane product is obtained through drying and dehydration, and the purity of the product is up to 99.91-99.98%.

The application belongs to the technical field of fine chemical industry, and particularly relates to a hydrogen bromide purification method for removing bromine, water and impurities before liquefaction, which comprises the following steps: S1, removal of free bromine: hydrogen bromide gas is introduced into a first bromine removal tank filled with a red phosphorus filler layer; S2, preliminary removal of water: the gas treated in S1 is introduced into a first drying tank filled with liquid phosphorus tribromide; S3, deep removal of trace water: the gas treated in S2 is introduced into a second drying tank filled with resin or mordenite; and S4, separation of mechanical impurities: the gas treated in S3 is introduced into a cyclone separator. By adopting the red phosphorus filler layer and controlling the loading amount, particle size and loading density of the red phosphorus, the free bromine in the hydrogen bromide gas can be efficiently removed, liquid phosphorus tribromide is used as a drying medium and is supplemented in real time to maintain the mass concentration of the phosphorus tribromide, so that the bromine and water content in the gas can be effectively reduced, and high-quality gas is provided for subsequent deep drying and impurity separation.

The application provides a synthesis method of 6-bromo-2-chloro-3-nitropyridine and relates to the technical field of organic synthesis. 2-amino-3-nitro-6-chloropyridine is reacted with a hydrobromic acid acetic acid solution to obtain 2-amino-3-nitro-6-bromopyridine, which is diazotized to obtain 6-bromo-2-hydroxy-3-nitropyridine, and then the 6-bromo-2-hydroxy-3-nitropyridine is reacted with a chlorinating reagent to obtain 6-bromo-2-chloro-3-nitropyridine. The synthesis method of 6-bromo-2-chloro-3-nitropyridine has the advantages of easy availability of raw materials, low price, mild reaction condition, simple process, high economic benefit, suitability for large-scale production, and the like, can solve the current situation of high price of 6-bromo-2-chloro-3-nitropyridine, and can play a positive role in the promotion of downstream products of 6-bromo-2-chloro-3-nitropyridine.

The present invention discloses a method for determining chloride ions in electronic grade hydrogen bromide by ion chromatography, comprising the following steps: (1) preparing and analyzing Cl ‑ Standard solution, obtain the working curve of concentration and peak area; (2) Pretreatment of hydrogen bromide sample: connect three washing bottles in series on the hydrogen bromide sampling tube, the first one is a buffer bottle, the second and third ones are absorption bottles filled with 100mL high-purity water, after absorption, combine the obtained hydrogen bromide absorption solution; (3) add alkali solution to adjust the pH value of hydrogen bromide solution to 4-10, and make up the volume with a volumetric flask to prepare the solution to be tested; (4) use ion chromatograph to detect the solution to be tested and obtain the trace amount of Cl in electronic grade hydrogen bromide ‑ The chromatogram of the test was obtained, and the Cl in the test solution was detected according to the external standard method. ‑ Quantitatively obtain Cl in electronic grade hydrogen bromide ‑ The method is simple to operate, has good reproducibility and high sensitivity.

The invention provides a preparation method of alkoxy bromoethane, which comprises the following steps: with alkoxy ethanol and phosphorus tribromide as raw materials, carrying out reaction in the presence of a catalyst and a solvent or without the solvent, and carrying out after-treatment to prepare the alkoxy bromoethane, the catalyst being selected from triethylamine, tripropylamine or pyridine. The preparation method disclosed by the invention is simple in process operation, can realize the total yield of 68-78% and the content of the obtained final product of 98% or above under optimal conditions, does not need special rectification for post-treatment of the product, has the advantages of high yield, low cost and easiness in industrial production, does not need hydrogen bromide gas, does not discharge high-concentration waste liquid and waste gas, is environment-friendly and more friendly, and is suitable for industrial production. And the method has a very high application prospect. # imgabs0 #

The utility model relates to the technical field of hydrogen bromide purification, and discloses an electronic-grade hydrogen bromide purification device which comprises a settling tank, a rotary feeding mechanism is arranged on the settling tank, and a waste gas discharge mechanism is arranged at the top of the settling tank; the rotary feeding mechanism comprises a supporting seat, the supporting seat is fixedly mounted at the top of the settling tank, a fixed pipeline is fixedly mounted on the inner wall of the supporting seat, and a first valve pipe is fixedly connected to the top of the fixed pipeline. Through the overall design of a rotary introduction mechanism, ozone can be introduced from a first valve pipe, the ozone can penetrate through a rotary pipeline to be output from the end of a branch pipeline, meanwhile, through work of a driving motor, the rotary pipeline can be driven to rotate integrally, so that the ozone is rotationally introduced into a stock solution, and meanwhile, a stirring paddle can be driven to rotate; the stirring paddle can stir the stock solution, so that the contact effect of the stock solution and the ozone is further improved, the utilization rate of the ozone is improved, and the consumption of the ozone is reduced.

The invention relates to the technical field of electronic gas purification, in particular to silicon-oxygen-silicon-containing polydivinylbenzene and a preparation method and application thereof, and the silicon-oxygen-silicon-containing polydivinylbenzene comprises a polydivinylbenzene skeleton; a silicon-oxygen-silicon bond is chemically bonded on the polydivinylbenzene skeleton. The silicon-oxygen-silicon-containing polydivinylbenzene is prepared by adopting an in-situ synthesis method, the silicon-oxygen-silicon-containing polydivinylbenzene reacts with the dry hydrogen bromide gas to obtain the silicon-bromine bond-containing polydivinylbenzene, and the water content in the hydrogen bromide gas can be reduced through hydrolysis reaction. The silicon-oxygen-silicon-containing polydivinylbenzene has stable properties, is environment-friendly in the preparation and transfer processes and the use process of the silicon-oxygen-silicon-containing polydivinylbenzene as a water removal material, does not introduce metal impurities, and has a good water removal effect.

The invention discloses low-defect few-layer graphene water-based conductive paste and a preparation method and application thereof, and belongs to the technical field of conductive paste. The low-defect few-layer graphene water-based conductive paste comprises the following components in parts by weight: 1-3 parts by mass of low-defect few-layer graphene, 100 parts by mass of ultrapure water and 0.8-1.2 parts by mass of a conductive additive, the low-defect few-layer graphene is obtained by performing room-temperature intercalation on graphite powder, performing chemical expansion and performing water-phase stripping by adopting an aqueous solution of 5 '-adenine nucleotide salt, the conductive additive is amphiphilic polythiophene; the amphiphilic polythiophene is obtained by polymerizing 2, 5-dibromo-3-triethylene glycol monomethyl ether thiophene and 3-[10-(4-toluene ether) decyl] thiophene which are used as monomers and then treating by hydrogen bromide and anhydrous acetic anhydride; the low-defect few-layer graphene water-based conductive paste prepared by the invention has few graphene defects, good dispersity and excellent conductivity.

The application discloses a high-temperature-resistant metalized capacitor film and a preparation method thereof, and belongs to the technical field of thin film or thick film capacitors. The application provides a novel method for preparing a metalized capacitor film, which comprises the following steps: taking 4-vinylbenzocyclobutene as raw material, and combining the raw material with hydrogen bromide after an addition reaction to obtain a substitution product; combining 2-methoxy-4-vinylphenol with the substitution product after demethylation to obtain a polymerization monomer containing a double bond and a cycloalkane structure; polymerizing the polymerization monomer with decafluorobiphenyl and 4-allylphenol to obtain a base film; and plating a metal layer on the base film to obtain the high-temperature-resistant metalized capacitor film. The application has good thermal stability, and solves the technical problem that a thermoplastic base film is deformed or decomposed at high temperature, and is difficult to meet the use requirement.

The invention relates to the technical field of biomass organophosphorus flame-retardant environment-friendly amino resin adhesive synthesis, and discloses a biomass organophosphorus flame-retardant environment-friendly amino resin adhesive synthesis method, which comprises: drying an agricultural waste biomass raw material until the water content is less than or equal to 5%, crushing, and screening with a 80-120 mesh sieve to obtain biomass powder. According to the synthesis method of the biomass organophosphorus flame-retardant environment-friendly amino resin adhesive, a phosphorus-carbon synergistic flame-retardant system is constructed through biomass (agricultural wastes) and organophosphorus, and the oxygen index of the adhesive can be increased to be greater than or equal to 33.5% (far greater than 22% of pure amino resin and 30% of an inorganic flame retardant) without high addition amount; meanwhile, hydroxyl groups and carboxyl groups in the biomass and a resin matrix form hydrogen bonds, so that 30%-40% of bonding strength reduction caused by agglomeration of a traditional inorganic flame retardant is effectively avoided, and the normal bonding strength of the product is ensured to be greater than or equal to 1.9 MPa; and halogen flame retardants are abandoned, so that no toxic gases such as hydrogen bromide and dioxin are released during combustion.

The application provides a preparation method of high-content 2-trifluoromethyl-4-heptafluoroisopropylaniline, in which 2-trifluoromethyl aniline and 2-bromine heptafluoropropane are reacted in the presence of hydrosulfite, a solvent and a catalyst to obtain high-content 2-trifluoromethyl-4-heptafluoroisopropylaniline through reaction and post-treatment; the catalyst is selected from phosphoric acid, pyrophosphoric acid, hypophosphorous acid, metaphosphoric acid, phosphorous acid, pyrophosphorous acid, hydrobromic acid, hydrogen bromide gas, hydrogen chloride gas or sodium bisulfite. The preparation method is simple in operation and mild in chemical reaction conditions; under the preferred reaction conditions, the conversion content reaches more than 96% in one reaction, the post-treatment steps are few, rectification is not needed, the content of the final product is more than 98%, the total reaction yield is more than 93%, the industrial production is easy, and the method has a high application prospect.

The present invention relates to a process for producing carbon comprising the step of exothermically pyrolyzing a starting composition containing at least 50% by mole of dibromomethane, less than 5% by mole of hydrogen donor and less than 0.5% by mole of oxygen in a pyrolysis reactor at a temperature of 600 to 2,000°C to carbon and hydrogen bromide.

The invention relates to a salt of a lappaconitine derivative as well as a preparation method and application thereof, the salt of the derivative is obtained by reacting (la, 14a, 16beta)-20-ethyl-1, 14, 16-trimethoxyaconitane-4, 8, 9-triol 4-[2-(ethylsulfonylamino)] benzoate with acid, and the acid can be hydrogen bromide, hydrogen chloride, nitric acid, phosphoric acid, p-toluenesulfonic acid or methanesulfonic acid and sulfuric acid. When the acid is hydrogen bromide or hydrogen chloride, the salt of the analogue exists in a crystal form with a crystal form A or a crystal form B. The analogue has the advantages of good solid property, high stability, good solubility, small hygroscopicity and the like, and can be used for preparing medicines for treating cardiovascular and cerebrovascular diseases.

This invention relates to a flame-retardant acrylic fabric and its preparation method. The fabric is characterized by being prepared by the following method: First, chloropropyl-POSS is reacted with melamine to obtain a substituted product; the substituted product is reacted with an aqueous solution of hydrogen bromide to obtain a modified solution; finally, the acrylic fabric is immersed in the diluted solution for finishing, thus obtaining the flame-retardant acrylic fabric. The flame-retardant acrylic fabric prepared by this invention has an initial limiting oxygen index (LOI) of over 34%, falling within the range of flame-retardant materials; after five washes, its LIO does not decrease significantly, remaining above 31%.

The invention discloses a preparation method of a 4-(allyl)-4-methyl-1, 1 '-biphenyl liquid crystal monomer, which comprises the following steps: S1, by taking p-phenylboronic acid, dechlorobenzyl alcohol, Pd / Cl and sodium carbonate as raw materials, reacting for 1-12 hours in a toluene and water system under the protection of nitrogen to obtain 4'-methyl-[1, 1 '-biphenyl]-4-benzyl alcohol (intermediate 1); s2, taking the intermediate 1 and hydrochloric acid as raw materials, and petroleum ether, toluene or ethanol as a solvent to obtain 3-(chloromethyl)-4 '-methyl-1, 1'-biphenyl (intermediate 2); s3, finally, chloropropene, the intermediate 2, magnesium particles and dibromoethane are used as raw materials, and tetrahydrofuran, petroleum ether or methylbenzene is used as a solvent; according to the present invention, the target compound is synthesized by using the existing raw materials and the technical equipment, such that the use amount of the catalyst is small, the catalytic efficiency is high, and compared with the hydrogen bromide, the corrosion on the equipment is weak, the conversion rate is high, the yield is high, the post-treatment process is simple, and the cost is reduced and the effect is improved.

The present application provides a hydrogen bromide hydrogenated nitrile rubber raw material composition, hydrogen bromide hydrogenated nitrile rubber and a preparation method thereof. The hydrogen bromide hydrogenated nitrile rubber raw material composition comprises a first component and a second component; the first component comprises acrylonitrile and butadiene monomers; and the second component comprises a functional monomer. The functional monomer can introduce bromine atoms, hydroxyl groups, ether groups and long-chain alkyl groups into the molecular chain of the hydrogenated nitrile rubber in a macromolecular form, so that the hydrogen bromide hydrogenated nitrile rubber obtained by polymerization has good low-temperature resistance and vulcanization speed.

The application discloses a device and method for treating flue gas, which comprises a urea supply device, a flue gas pipeline, a cooling device, a dust removal device, a denitration device and an absorption device, wherein the urea supply device is provided with a urea outlet, the flue gas pipeline is provided with a high-temperature flue gas inlet, a urea inlet and a mixed flue gas outlet, the urea inlet is connected with the urea outlet, the cooling device is provided with a mixed flue gas inlet, a cooled flue gas outlet and a cooling medium inlet, the mixed flue gas inlet is connected with the mixed flue gas outlet, the dust removal device is provided with a cooled flue gas inlet and a dust-removed flue gas outlet, the cooled flue gas inlet is connected with the cooled flue gas outlet, the denitration device is provided with a dust-removed flue gas inlet and a denitration flue gas outlet, the dust-removed flue gas inlet is connected with the dust-removed flue gas outlet, and the absorption device is provided with a denitration flue gas inlet and a purified flue gas outlet. The device can be used for treating flue gas containing nitrogen oxides, bromine and / or hydrogen bromide, and the water consumption and treatment cost can be reduced.

The application is suitable for the technical field of inorganic substance preparation method, and provides a preparation method of bromine, which comprises the following steps: step one: a certain amount of sodium bromide and hydrobromic acid are added into a mother liquor pool and stirred to obtain a mother liquor; step two: a predetermined amount of stearic acid and polyvinylpyrrolidone are added; step three: preheating is carried out, and then the preheating is fed into an absorption tower; step four: the liquid at the bottom of the absorption tower flows into the upper part of a bromine evaporation tower, and is heated by steam in the bromine evaporation tower; water vapor and chlorine gas are introduced from the bottom of the bromine evaporation tower, and bromine steam enters the absorption tower; step five: the distillation acid liquid generated by the bromine evaporation tower flows into a preheater to be preheated; bromine steam flows out from the upper part of the bromine evaporation tower to obtain a bromine and water mixture; step six: the bromine and water mixture flows into a bromine water separation bottle to be separated, and bromine products are obtained, thereby, the bromine source is hydrogen bromide and sodium bromide; the stearic acid can effectively reduce the surface tension, so that the reaction is more uniform, and the system is stable.