45 results about "Tetrabromobisphenol A" patented technology

The application provides a pretreatment and detection method of tetrabromobisphenol A and ten common derivatives thereof in sludge, which comprises the following steps: (1) sample pretreatment: after mixing the frozen and dried sludge sample and the isotopic internal standard, oscillation extraction is carried out, and the extraction liquid is obtained after centrifugation by a centrifuge; the extraction liquid is purified by solid phase extraction to obtain a sample to be detected; (2) the sample to be detected obtained in the step (1) is detected by high performance liquid chromatography-tandem mass spectrometry; (3) the content of tetrabromobisphenol A and ten common derivatives thereof in the sample is calculated according to the internal standard method. The application provides a rapid and sensitive analysis and quantitative method of tetrabromobisphenol A and ten common derivatives thereof in sludge samples.

The invention discloses an acinetobacter LYS-5 for degrading tetrabromobisphenol A and application thereof, relates to the field of microorganisms, and aims to solve the problem that tetrabromobisphenol A pollution in saline-alkali soil is difficult to repair by existing microorganisms. The acinetobacter is Acinetobacter pitefer LYS-5, and is preserved in China General Microbiological Culture Collection Center (CGMCC), the preservation address is No.3, No.1 yard, Beichen West Road, Chaoyang District, Beijing, the preservation date is April 22, 2024, and the preservation number is CGMCC No.30399. The invention further discloses a preparation method of the Acinetobacter pitefer LYS-5, and the acinetobacter pitefer LYS-5 has the advantages that the acinetobacter pitefer LYS-5 can be used for preparing the acinetobacter pitefer LYS-5; the method is used for degrading the pollutant tetrabromobisphenol A in a water body and saline-alkali soil.

The application provides a catalyst for catalytic wet oxidation of tetrabromobisphenol A wastewater, a preparation method and application thereof, and belongs to the technical field of wastewater treatment. The catalyst comprises a main metal oxide and a crystal lattice adjusting metal oxide; the main metal oxide comprises one or more of MnO2, Co3O4, NiO or MoO3, and the crystal lattice adjusting metal oxide comprises an oxide of Ce and / or an oxide of La. The preparation method comprises the following steps: adding main metal salt, crystal lattice adjusting metal salt and citric acid into water, evaporating and concentrating, drying, first calcining, adding sodium hydroxide into water to perform a closed pressurized reaction, washing and drying, second calcining, placing into a nitric acid solution, heat treatment, washing and drying, placing into water with hydrogen peroxide and acetic acid to perform a heat reaction, filtering and drying, and obtaining the catalyst. The catalyst introduces a large number of oxygen defects through a mode of "lattice doping - partial metal removal - lattice distortion", so that the catalyst has a large oxygen storage capacity, can activate the C-Br bond, and can efficiently catalyze the oxidation of tetrabromobisphenol A wastewater.

The present invention provides a flame retardant composition for foamed styrene resin, which can be used to produce a foamed molded body having excellent flame retardancy and heat resistance, a flame-retardant foamed styrene resin composition, and an extrusion-foamed molded body thereof. The flame retardant composition for foamed styrene resin of the present invention contains at least component (B1) tetrabromobisphenol A-bis(2,3-dibromo-2-methylpropyl ether), component (C) zinc fatty acid, and component (D) fatty acid metal salt (except for the (C) component), the content of the (C) component is 0.1 to 15 parts by mass per 100 parts by mass of the (B1) component, and the content of the (D) component is 1 to 35 parts by mass per 100 parts by mass of the (B1) component.

The invention discloses a nickel / copper-hexamercaptobenzene composite catalyst loaded with iron, nickel and palladium as well as a preparation method and application of the nickel / copper-hexamercaptobenzene composite catalyst. The catalyst takes nickel / copper-hexamercaptobenzene nanoparticles as a carrier and is loaded with active components of iron, nickel and palladium, and the preparation method comprises the following steps: synthesizing the carrier under an anaerobic condition, performing ultrasonic stripping, and loading Fe, Ni and Pd through chemical deposition in sequence under the protection of inert gas. Pd in the obtained catalyst is highly dispersed, Fe and Ni exist in a crystalline phase form, and the carrier is fully stripped and is rich in defects. The catalyst is used for degrading tetrabromobisphenol A in water, under the conditions that the pH is 3-5, the adding amount of the catalyst is 0.125 g / L and room-temperature ultrasonic assistance is carried out, the degradation rate of 98% or above can be achieved for a TBBPA solution with the initial concentration smaller than or equal to 10 mg / L within 20 min, and the catalyst has the advantages of being efficient and rapid.

The invention relates to the technical field of waste recycling, in particular to a harmless treatment and resource recycling method for bromine in bromine-containing waste, which comprises the following steps: putting the bromine-containing waste into a reaction solution, and heating for reaction to obtain debrominated waste and filtrate containing bromine ions; the reaction liquid comprises an alkaline substance, a copper compound precursor, a ligand and a solvent; the ligand is selected from at least one of a bidentate ligand containing two nitrogen sites, a polydentate ligand containing two nitrogen sites, a bidentate ligand containing two oxygen sites, a polydentate ligand containing two oxygen sites, a bidentate ligand containing one nitrogen and one oxygen site and a polydentate ligand containing one nitrogen and one oxygen site; the temperature of the heating reaction is not higher than 150 DEG C. The invention solves the problems of environmental pollution and bromine resource waste caused by organic bromine pollutants (such as highly toxic brominated dioxin) due to landfill, incineration and other traditional treatments after the brominated flame retardant (such as tetrabromobisphenol A, polybrominated diphenyl ether and the like)-containing plastic or resin is abandoned.

The invention provides porous carbon, a silicon-carbon negative electrode material and a preparation method thereof, and the preparation method of the porous carbon comprises the following steps: providing a mixture comprising first resin, a flame retardant and a defoaming agent, dissolving the mixture in a first organic solvent, and carrying out spray drying to prepare a granular precursor, the flame retardant comprises at least one of decabromodiphenyl ethane, decabromodiphenyl ether, octabromodiphenyl ether, pentabromodiphenyl ether, tetrabromobisphenol A and hexabromocyclododecane, and at least one of decabromodiphenyl ether, octabromodiphenyl ether, pentabromodiphenyl ether, tetrabromobisphenol A and hexabromocyclododecane; carrying out carbonization treatment on the granular precursor to form a carbonization treatment product; and carrying out activating treatment on the carbonization treatment product to form the porous carbon.

The application provides a method for recovering tribromophenol, tetrabromobisphenol A and dibromophenol from bromine-containing solid waste by melting crystallization, and relates to the field of solid waste recovery. The method comprises the following steps: mixing bromine-containing solid waste, a solvent and a catalyst to perform a reaction, then performing liquid-liquid separation to obtain a bromine-containing organic phase and salt-containing wastewater; recovering the solvent in the bromine-containing organic phase to obtain a bromine-containing organic mixture; preheating the bromine-containing organic mixture, then performing melting, cooling, sweating and melting treatment to obtain crude tribromophenol and crude tetrabromobisphenol A; performing vacuum rectification on the crude tribromophenol to obtain dibromophenol and a column still product; performing recrystallization, solid-liquid separation, water washing and drying on the column still product to obtain tribromophenol; and performing recrystallization, solid-liquid separation, alkali washing and drying on the crude tetrabromobisphenol A to obtain tetrabromobisphenol A. The method provided in the application adopts reaction impurity removal and melting crystallization and is coupled with a recrystallization process, so that tribromophenol, tetrabromobisphenol A and dibromophenol products can be obtained at the same time, the process is simple, and the energy consumption is significantly reduced compared with the traditional method.

The present invention discloses a multi-element-doped binary composite carbon material, its preparation method, and application, belonging to the technical field of electromagnetic wave absorbing material preparation. The preparation method of the binary composite carbon material comprises the following steps: 2-hydroxy-4-methoxy-5-sulfonic acid benzophenone and N-hydroxymethyl acrylamide are alkylated to prepare a sulfonic acid functional monomer; tetrabromobisphenol A, methacrylic anhydride, and p-toluenesulfonic acid are esterified to prepare a bromine functional monomer; the sulfonic acid functional monomer and the bromine functional monomer are subjected to free radical polymerization to prepare a binary polymer; and finally, the binary polymer is carbonized. The multi-element-doped binary composite carbon material prepared by the preparation method of the present invention has a minimum reflection loss of 55.25dB in the 2-18 GHz frequency band, providing a new approach to solving the bottleneck problems of existing absorbing materials, such as a single loss mechanism, weak attenuation capability, and complex preparation process.

The invention discloses a multi-element doped binary composite carbon material as well as a preparation method and application thereof, and belongs to the technical field of preparation of electromagnetic wave absorbing materials. Comprising the following steps: carrying out an alkylation reaction on 2-hydroxy-4-methoxy-5-sulfonic benzophenone and N-hydroxymethyl acrylamide to prepare a sulfonic functional monomer; the preparation method comprises the following steps: carrying out esterification reaction on tetrabromobisphenol A, methacrylic anhydride and p-benzene methanesulfonic acid to prepare a bromo functional monomer; the sulfonic functional monomer and the bromo functional monomer are subjected to free radical polymerization reaction to prepare a binary polymer; and finally, carbonizing the binary polymer. The minimum reflection loss of the multi-element doped binary composite carbon material prepared by the preparation method disclosed by the invention in the frequency band of 2-18 GHz reaches-55.25 dB, and a new idea is provided for solving the bottleneck problems of single loss mechanism, weak attenuation capability, complex preparation process and the like of the existing wave-absorbing material.

The present invention belongs to the technical field of organic synthesis, and specifically relates to an ultra-high molecular weight methyl bromide epoxy resin, a preparation method thereof, and an application thereof. The preparation method provided by the present invention has simple steps, is easy to operate, and is convenient for industrial production. The ultra-high molecular weight methyl bromide epoxy resin obtained can be used for the modification of resins such as PBT and PET, and has good miscibility with other resins. Compared with the traditional high molecular weight brominated epoxy resin synthesized with epichlorohydrin and tetrabromobisphenol A, the ultra-high molecular weight methyl bromide epoxy resin provided by the present invention has good miscibility with other resins, better UV resistance and weather resistance, good mechanical and electrical properties, a melting point between 147 and 153°C, excellent physical and chemical properties, and a wider range of applications. The ultra-high molecular weight methyl bromide epoxy resin provided by the present invention is particularly suitable for the modification of PBT, PET, or flame-retardant hair. The amount used in flame-retardant hair is reduced by more than 20%, with significant economic benefits and further improved product quality.

The invention provides a method for recovering tribromophenol, tetrabromobisphenol A and dibromophenol in bromine-containing solid waste through melt crystallization, and relates to the field of solid waste recovery. The method comprises the following steps: mixing the bromine-containing solid waste, a solvent and a catalyst for reaction, and then carrying out liquid-liquid separation to obtain a bromine-containing organic phase and salt-containing wastewater; recovering the bromine-containing organic phase solvent to obtain a bromine-containing organic mixture; preheating the bromine-containing organic mixture, melting, cooling, sweating and melting to obtain a tribromophenol crude product and a tetrabromobisphenol A crude product; carrying out reduced pressure rectification on the tribromophenol crude product to obtain a dibromophenol product and a tower kettle product, and carrying out recrystallization, solid-liquid separation, washing and drying on the tower kettle product to obtain a tribromophenol product; and carrying out recrystallization, solid-liquid separation, alkali washing and drying on the crude tetrabromobisphenol A product to obtain the tetrabromobisphenol A product. According to the method, reaction impurity removal, melt crystallization and recrystallization are coupled, tribromophenol, tetrabromobisphenol A and dibromophenol products are obtained at the same time, the process is simple, and energy consumption is remarkably reduced compared with traditional methods.

The utility model discloses a tower for recycling a tetrabromobisphenol A wastewater solvent, and belongs to the technical field of tetrabromobisphenol A. The tower for recycling the tetrabromobisphenol A wastewater solvent comprises a flash tower body, the flash tower body comprises an upper tower body, a middle tower body and a lower tower body, one side of the upper tower body is communicated with a feeding pipe, and the other side of the upper tower body is communicated with a discharging pipe. A spraying part is mounted at the bottom end of the feeding pipe, the middle tower body is provided with a filler layer, and a circulating part is mounted at the bottom end of the lower tower body. According to the device, the contact area of wastewater and the filler layer is increased through the spraying part, so that the wastewater is more uniformly contacted with the filler layer, the heat transfer effect is enhanced, the heat utilization rate is further improved, the steam consumption is reduced, the energy utilization efficiency of the whole process is improved, and continuous feeding and discharging can be realized during working through cooperation of the circulating part; the automation degree is high, the use amount of energy is reduced, and the cost is reduced.

The invention provides a preparation method of octabromo-ether, and belongs to the technical field of flame-retardant materials. According to the method, the tetrabromobisphenol A and the allyl bromide are subjected to the carbon-oxygen coupling reaction under the catalysis of the catalyst, no halogenated salt byproduct is generated, repeated purification is not needed, the loss of the octabromo-ether caused by aftertreatment is effectively reduced, and the yield of the octabromo-ether is increased; then hydrobromic acid and tetrabromobisphenol A diallyl ether are subjected to an addition reaction under catalytic oxidation of hydrogen peroxide to obtain octabromoether, and high-toxicity bromine does not need to be adopted; and hydrogen peroxide is adopted to generate oxygen and water in the reaction, thereby being green and environment-friendly. The result of the embodiment shows that the preparation method provided by the invention is green and environment-friendly, and the yield of the prepared octabromo-ether can reach 99.6%.

The invention discloses a preparation method of octabromo-ether, and belongs to the technical field of flame retardants, the preparation method comprises the following steps: synthesizing tetrabromobisphenol A, synthesizing tetrabromobisphenol A diallyl ether, and synthesizing tetrabromobisphenol A bis (2, 3-dibromopropyl) ether; the synthesis of tetrabromobisphenol A diallyl ether comprises the following steps: mixing tetrabromobisphenol A, methanol and a first part of deionized water, heating to 50-55 DEG C, stirring and refluxing until the tetrabromobisphenol A, methanol and the first part of deionized water are completely dissolved, adding sodium hydroxide, stirring and refluxing, adding a catalyst, stirring and refluxing, dropwise adding 3-chloropropene, then continuing stirring and refluxing, distilling out all methanol, and cooling to room temperature to obtain the tetrabromobisphenol A diallyl ether. Mixing with a second part of deionized water and dichloromethane, stirring at room temperature, standing, taking an organic layer, centrifuging, taking supernate, washing with deionized water, distilling out all dichloromethane, and drying; the prepared octabromo-ether is high in purity and yield and good in appearance performance, the condensation problem of the obtained octabromo-ether is avoided, and the yield is stable.

This invention relates to the field of environmental pollutant detection, specifically to the application of organosilicon nanodots and their hydrogel sensors in the detection of tetrabromobisphenol A (TBA) concentration. The method includes: uniformly mixing an organosilicon nanodot stock solution with a sample to be tested, allowing it to stand in the dark to obtain a test solution; acquiring the sample fluorescence intensity value of the test solution at a specific wavelength, and the control fluorescence intensity value of a blank control solution without the test sample; calculating the quenching efficiency based on the sample fluorescence intensity value and the control fluorescence intensity value; and calculating the TBA concentration of the sample to be tested based on the quenching efficiency and a standard working curve; wherein the standard working curve is obtained by fitting the concentration of a TBA standard solution and its corresponding quenching efficiency. This invention aims to provide a simple, efficient, environmentally friendly, highly sensitive, and highly selective method for detecting TBA concentration.

The present invention provides a flame-retardant resin composition which is excellent in flame retardancy and heat resistance and is less likely to cause blooming. The present invention relates to a flame-retardant polypropylene resin composition characterized by comprising: (A) a polypropylene resin: 100 parts by weight; (B) a mixture of specific bisphenol S derivatives: 2 to 50 parts by weight; (C) at least one of (c1) tetrabromobisphenol A bis(2,3-dibromopropyl) ether and (c2) tris(2,3-dibromopropyl) isocyanurate: 0.2 to 20 parts by weight; and (D) at least one of antimony trioxide, antimony pentoxide, zinc molybdate, boron trioxide and zinc borate: 1 to 20 parts by weight.

The present application relates to the technical field of automatic control of chemical separation equipment, and particularly relates to an automatic control method for a high-cycle batch four-bromine bisphenol A centrifugal separation process. Data in a feed pipe is collected, corresponding control signals are output until filter cake load feedback data reaches a set threshold value; feed parameters are collected, a dynamic dewatering control algorithm is used to control mother liquor turbidity to be lower than a set threshold value; material liquid temperature and mother liquor turbidity data are collected, two control signals are formed by an intelligent spraying control algorithm, and are output to two gradient spraying pumps; a constant maximum speed control signal is output to a centrifuge main motor driver, filter cake humidity feedback is collected, and when humidity feedback data reaches a set drying target value, a discharge instruction is output and the control process is completed. The present application collects multi-dimensional data of material state and separation effect in real time through an online sensor network, and achieves the technical effect that even if feed conditions fluctuate, the excellent stability of batch product quality can be ensured.

This application relates to a high-melting-point, high-whiteness methyl octabromoether flame retardant composition and its preparation method, belonging to the fields of fine chemicals and flame retardant preparation technology. The method includes: etherifying tetrabromobisphenol A, sodium hydroxide, and allyl chloride; purifying the mixture by isothermal crystallization at 30–50°C to obtain a tetrabromoether intermediate; dissolving the intermediate in dichloromethane and reacting it with bromine at 10–40°C; and finally, obtaining the finished product through post-treatment. This invention effectively removes impurities such as monoethers through a specific intermediate crystallization process, and avoids overheating and oxidation side reactions by combining low-temperature bromination and optimized solvent ratios. The obtained flame retardant has a melting point ≥106°C, whiteness R457 ≥92, and bromine content ≥67%, exhibiting advantages such as good thermal stability, low volatility, and high purity. The process conditions are mild and suitable for industrial production.

The invention belongs to the technical field of electrochemical catalytic degradation of organic pollutants, and particularly relates to a method for degrading tetrabromobisphenol A through redox and electrocatalysis and application of the method. The method comprises the following steps that an electrolyte is added into an electrolytic bath, and a cathode material and an anode material are put into the electrolytic bath for electrolysis; the tetrabromobisphenol A is subjected to an electroreduction debromination reaction at the cathode to be degraded into bisphenol A; then, the bisphenol A is further electrically oxidized into carbon dioxide and water at the anode, so that thorough degradation of the tetrabromobisphenol A is realized; the electrolyte comprises tetrabromobisphenol A, a surfactant and a supporting electrolyte, the concentration of the surfactant is 0.1-2 mmol / L, and the concentration of the supporting electrolyte is 0.1-1 mol / L; the cathode material is zinc, and the anode material is boron-doped diamond. According to the invention, reduction of tetrabromobisphenol A and oxidation of bisphenol A are synchronously realized in the same electrolytic bath by selecting a cathode material and an anode material.

The invention discloses an environment-friendly two-component polyurethane pouring sealant and a preparation method thereof. The two-component polyurethane pouring sealant comprises a component A and a component B, the component A is prepared by compounding the following raw materials: polyether polyol, a macromolecular reaction type brominated flame retardant, a defoaming agent, black paste and a catalyst; and the component B is prepared by compounding the following raw materials: isocyanate, an isocyanate-terminated polyether polyol prepolymer and a defoaming agent. According to the environment-friendly double-component polyurethane pouring sealant, the macromolecular hydroxyl-containing reactive liquid brominated flame retardant is added, so that on one hand, the viscosity, the density and the hardness of the polyurethane pouring sealant are greatly reduced, and a pouring process and light weight are facilitated; on the other hand, the flame retardant can have good compatibility with polyether polyol in the component A, migration and precipitation of tetrabromobisphenol A are reduced after the flame retardant reacts with isocyanate in the component B, toxicity is reduced, environment friendliness is improved, and the flame retardance of the flame retardant is not reduced.

The invention provides a pretreatment method and an analysis method of tetrabromobisphenol A and a unilateral derivative thereof in sludge. According to the pretreatment method, step-by-step extraction is adopted, extraction agents are n-hexane and acetone and n-hexane and dichloromethane, synchronous extraction of multi-polar target objects is achieved, and interferents such as lipid and protein are removed through purification with a gel chromatographic column; the analysis method is based on an LC-HRMS (Liquid Chromatography-High Resolution Mass Spectrometry) combined technology, and high-sensitivity detection is realized through a gradient elution and multi-reaction monitoring mode. The method effectively solves the problem of synchronous analysis of the polybrominated phenolic compounds in the complex matrix, and has the advantages of simplicity and convenience in operation, strong anti-interference capability, stable recovery rate and the like.

The invention relates to the field of environmental pollutant detection, in particular to application of organic silicon nanodots and a hydrogel sensor thereof in tetrabromobisphenol A concentration detection. Comprising the following steps: uniformly mixing an organic silicon nanodot stock solution with a to-be-detected sample, and standing in a dark place to obtain a to-be-detected solution; acquiring a sample fluorescence intensity value of the to-be-detected solution under a specific wavelength and a control fluorescence intensity value of a blank control solution which does not contain the to-be-detected sample; calculating a quenching efficiency based on the sample fluorescence intensity value and the control fluorescence intensity value; based on the quenching efficiency and a standard working curve, calculating the tetrabromobisphenol A concentration of the sample to be detected; wherein the standard working curve is obtained by fitting the concentration of the tetrabromobisphenol A standard solution and the corresponding quenching efficiency of the tetrabromobisphenol A standard solution. The invention aims to provide the tetrabromobisphenol A concentration detection method which is simple in process, efficient, environment-friendly, high in detection sensitivity and high in selectivity.

The utility model relates to the field of chemical equipment, and provides a tower for washing tetrabromobisphenol A. The tower comprises a first component settling area, a filler area and a second component settling area which are arranged from top to bottom, a water inlet and a first disperser are arranged at the lower end of the filler area, and the first disperser is fixedly connected with the inner side wall of the filler area; the first end of the water inlet is communicated with the first disperser, a feeding hole and a second disperser are arranged at the upper end of the filler area, the second disperser is fixedly connected with the inner side wall of the filler area, the first end of the feeding hole is communicated with the second disperser, and a first discharging hole is formed in the top of the first component settling area; a first discharge port is formed in the bottom of the first component settling area, a second discharge port is formed in the bottom of the second component settling area, the diameter of the first component settling area is larger than that of the filler area, and the diameter of the second component settling area is larger than that of the filler area.

The application belongs to the technical field of flame retardants, and particularly relates to a surface modified bromide flame retardant and a preparation method thereof. The surface modified bromide flame retardant is prepared by using tetrabromobisphenol A glycidyl ether and 2,7-dihydroxynaphthalene as raw materials, and reacting under the action of a catalyst benzyltriphenylphosphonium bromide to obtain a high molecular weight brominated epoxy resin flame retardant. Then, the high molecular weight brominated epoxy resin flame retardant is modified and grafted by using cyclotriphosphazene modifier to obtain a surface modified high molecular weight brominated epoxy resin flame retardant. The high molecular weight brominated epoxy resin flame retardant is synthesized by using tetrabromobisphenol A glycidyl ether and 2,7-dihydroxynaphthalene, the naphthalene group introduced can greatly improve the thermal stability of the flame retardant, meanwhile, the high molecular weight brominated epoxy resin flame retardant is surface grafted and modified by using cyclotriphosphazene modifier, the cyclotriphosphazene with high efficient charring capacity is introduced, and the carbon layer produced in the process of playing the flame retardant role can improve the smoke problem of the brominated epoxy resin flame retardant.

The application discloses a method for analyzing multiple halogenated phenols based on hydrogen bond enhanced halogen bond recognition, which mainly comprises the following steps: constructing a selective recognition surface enhanced Raman substrate, selectively capturing target molecules, collecting signals and extracting chemical characteristics, embedding physical / chemical prior knowledge into machine learning multi-component decoupling, and the like. The application overcomes the interference of complex matrix in water, realizes selective capture, breaks through the black box limitation of traditional pure data driven model, constructs a physical information guided machine learning model, and realizes the detection of multiple halogenated phenols. The application can be used for selectively capturing halogenated phenol persistent organic pollutants (such as trichlorophenol, tribromophenol, tetrabromobisphenol A and the like) in a water phase environment containing background inorganic salt or non-halogenated aromatic organic matter interference, and realizes the qualitative screening of target pollutants in combination with a surface enhanced Raman spectroscopy technology.

The invention provides a method for selectively extracting lithium from a waste ternary positive electrode material, which comprises the following steps of: (1) roasting the waste ternary positive electrode material for the first time to obtain a pretreated material; (2) the pretreated material in the step (1) is subjected to first ball milling in a first composite ball milling agent and a tetrabromobisphenol A bis (2, 3-dibromopropyl) ether solution, a first ball-milled material is obtained, and the first composite ball milling agent comprises Na2S2O3, sodium bicarbonate and trisodium citrate; (3) carrying out second ball milling on the first ball-milled material in the step (2) to obtain a second ball-milled material; and (4) sequentially carrying out acid leaching and solid-liquid separation on the second ball-milled material in the step (3) to obtain a lithium-containing solution and nickel-cobalt-manganese-containing solid-phase slag. The leaching rate and selectivity of lithium can be improved, and the application prospect is wide.

According to the method for relieving the toxic effect of tetrabromobisphenol A on rice by utilizing the phosphorus source, 22.4 mg / L monopotassium phosphate (KH2PO4) is taken as a core concentration parameter, and the phosphorus absorption efficiency and stress resistance of seedlings are remarkably improved through rhizosphere liquid application supplement. The method is strictly based on laboratory verification data, is suitable for planting the rice in the farmland polluted by the tetrabromobisphenol A, and is simple and convenient to operate and low in cost.

The application provides a high-heat-resistant flame-retardant polyurethane resin and a preparation method thereof. The resin comprises a flame-retardant polymer, wherein the flame-retardant polymer is copolymerized from a tetrabromobisphenol A diallyl ether (TBPA) monomer and a 2-vinyl-4,6-diamino-1,3,5-triazine (VDT) monomer, and the resin further comprises isocyanate, a polythiol compound and the like. The polyurethane resin material of the application not only has the flame-retardant property, and the limiting oxygen index (LOI) value can reach 32, but also improves the glass transition temperature of the resin.

The invention belongs to the technical field of chemical purification, and particularly relates to a tetrabromobisphenol A purification device and method. The purification device comprises a crystallization reaction kettle, the crystallization reaction kettle comprises a kettle body and a push type stirring assembly located in the kettle body, and an inner cavity of the kettle body is divided into an upper-layer mixing area and a lower-layer crystallization area through a horizontally-arranged flow dividing partition plate; a second jacket is arranged on the outer wall of the mixing area, a first jacket is arranged on the outer wall of the crystallization area, an inner cylinder is arranged in the middle of the crystallization area, a second medium inlet and a second medium outlet which are respectively communicated with the inner cylinder are formed in one side of the kettle body, a nucleation area is formed in the inner cavity space of the inner cylinder, and a growth area is formed between the outer wall of the inner cylinder and the inner wall of the kettle body. According to the purification route, efficient purification of tetrabromobisphenol A is achieved through cooperation of solvent gradient extraction and gradient temperature control, and the method has both environmental protection property and economical efficiency and is suitable for industrial production.