47results about "Alkali metal bromides" patented technology

The invention relates to a waste circuit board resourceful treatment technology, in particular to a method for recovering sodium fluoride, sodium chloride and sodium bromide from smelting flue gas absorption liquid, which comprises the following steps: (1) carrying out primary evaporative crystallization on the absorption liquid, and separating after the bromine content reaches a first target value to obtain sodium fluoride, primary crystallization mother liquor and condensed water, (2) dissolving sodium bromide in the primary crystallization mother liquor for phase equilibrium blending; (3) carrying out secondary evaporative crystallization on the blended liquid, and separating after the bromine content reaches a second target value to obtain sodium chloride, secondary crystallization mother liquor and condensed water; and (4) carrying out tertiary evaporative crystallization on the secondary crystallization mother liquor, and separating to obtain sodium bromide, tertiary crystallization mother liquor and condensed water. According to the method, high-value sodium fluoride, sodium chloride and sodium bromide can be separated and recycled from the waste circuit board smelting flue gas absorption liquid, condensate water is recycled, no waste liquid is discharged, and good economic and environment-friendly benefits are achieved.

The invention discloses a treatment process for recycling associated resources of gas field water, and relates to the technical field of gas field water treatment. Adsorbing and extracting lithium from the pretreated gas field water, selectively adsorbing lithium ions in the gas field water by adopting a lithium adsorbent, and recycling lithium by using a generated desorption solution; the adsorption tail liquid after lithium extraction is subjected to hardness removal treatment, and divalent hardness ions in the gas field water are removed; evaporating the hardness-removed gas field water to separate out sodium, and cooling and crystallizing mother liquor subjected to sodium separation by evaporation to produce potassium chloride; and extracting bromine from the gas field water subjected to cooling crystallization treatment by adopting an electrooxidation process. Not only is efficient purification of the gas field water achieved, but also the effect of recycling associated resources of the gas field water is achieved in the purification process.

This invention provides oil-based fluids comprising a halogen-containing sorbent, which sorbent comprises one or more halogens selected from fluorine, chlorine, bromine, and / or iodine, and one or more substrate materials.

The application discloses a process method for preparing high-quality sodium bromide from bromine-containing brine without chlorine, and belongs to the technical field of chemical production. The process method uses ozone as an oxidant to oxidize bromine-containing brine, and simultaneously uses a gaseous membrane method to prepare sodium bromide. The process method is green, safe and efficient, and can greatly improve the safety of the production process without using chlorine as an oxidant. The bromine extraction mother liquor is environmentally friendly and does not contain residual chlorine. The obtained industrial sodium bromide product does not contain chlorine ions, the main content of sodium bromide is greater than 99%, and the quality is better than the indexes specified in the industry standard HG / T 3809-2006.

The invention relates to the technical field of crystallization, in particular to a sodium bromide production device and method. The sodium bromide production device comprises a base, and the upper end face of the base is fixedly connected with a shell; the crystallization mechanism comprises a crystallization box fixedly connected to the upper half part in the shell, a cross-shaped partition plate is fixedly connected to the interior of the crystallization box, and the interior of the crystallization box is divided into a plurality of crystallization areas with the same volume by the cross-shaped partition plate; a vibration guide assembly, two resonance assemblies and a liquid level detector are arranged in each crystallization area, and the upper end face of the crystallization box is connected with a turning cover through a hinge; through a cross-shaped partition plate, a vibration guide assembly and a resonance assembly in the crystallization mechanism, sodium bromide to be crystallized in the crystallization box can be subjected to partition crystallization and uniform crystallization, and the vibration guide assembly can transmit vibration waves to a detector to master the crystallization condition, so that the crystallization uniformity and quality of the sodium bromide can be improved, and the crystallization efficiency is improved. And the uniformity and efficiency of the crystallization process are effectively improved.

The utility model discloses a device for producing sodium bromide by an electrooxidation method, which relates to the technical field of sodium bromide and comprises a bromine-containing brine tank, electrooxidation equipment, a brine tank, a blow-off tower, a waste brine tank, a first absorption tower, a second absorption tower, a demisting tower, an evaporation kettle, a centrifugal machine, a sodium hydroxide solution tank, a urea solution tank, a mother liquor tank and a disc dryer, the first absorption tower and the second absorption tower are respectively communicated with a sodium hydroxide solution tank and a urea solution tank, the electrooxidation equipment comprises an anode chamber and a cathode chamber, the anode chamber is communicated with a bromine-containing brine tank, and the anode chamber is communicated with a brine tank; bromine-containing brine is directly electrolyzed through electrooxidation equipment and then enters a blow-off tower, bromine-containing gas sequentially enters a first absorption tower and a second absorption tower to be circularly absorbed for multiple times, and meanwhile, a sodium hydroxide solution is adopted as an oxidizing agent and a urea solution is adopted as a reducing agent in the first absorption tower and the second absorption tower; other components are not easily doped, and the extraction precision of sodium bromide is high.

The present invention provides a method and device for recovering bromine and sodium elements from PTA tail gas treatment waste liquid, relates to the technical field of terephthalic acid oxidation waste liquid treatment, and solves the technical problem that PTA waste liquid in the prior art is only discharged through sulfuric acid neutralization and biochemical treatment, which easily causes the loss of high-value materials such as sodium bicarbonate, sodium carbonate and sodium bromide. The recovery method includes concentrating the pretreated waste liquid to form a concentrated liquid; adjusting the pH value of the concentrated liquid to alkaline and evaporating and crystallizing it to obtain sodium carbonate crystals and / or sodium bicarbonate crystals; subjecting the mother liquor after evaporation and crystallization to special nanofiltration treatment to obtain a sodium bromide desalinated water solution; concentrating the sodium bromide desalinated water solution to obtain a high-concentration sodium bromide solution for subsequent evaporation and crystallization or bromine extraction treatment. The present invention can recover the solute in the waste liquid and convert it into a product salt with high economic value, and the remaining waste liquid is also more conducive to subsequent treatment and discharge.

There is provided an oxygen scavenger composition comprising iron, a metal salt, and water, wherein the content of water per unit surface area of the iron present on the surface of the iron, [the content of water present on the surface of the iron (g) / {the content of the iron (g) × the specific surface area of the iron (m2 / g)}], is more than 2.00 g / m2 and 3.50 g / m2 or less.

This invention discloses a high-efficiency sodium bromide recovery process for PTA wastewater, belonging to the technical field of wastewater treatment and bromine resource recovery and utilization in the production of purified terephthalic acid. The process includes the following steps: Pretreatment softening: A stream of bromine-containing wastewater generated during the production of purified terephthalic acid is provided. The bromine-containing wastewater is introduced into a chelating resin unit at a volume hourly space velocity (VHSV) to remove calcium and magnesium ions from the bromine-containing wastewater, resulting in softened water. Through a re-filtration enhanced salt separation step, the physical washing effect of the dialysis water is utilized to effectively wash the retained bromide ions into the product water side, overcoming the Donnan effect at high concentrations. Through an acidification and decarbonation step, the wastewater is transformed from a complex ternary system of carbonates, bromides, and sulfates into a simple binary system of sulfates and bromides, eliminating the interference of carbonate ions on the membrane system.

The invention relates to the technical field of pesticide production, in particular to a method for purifying byproduct salt in pesticide production, which comprises the following steps of: dissolving the synthesized pesticide byproduct potassium bromide solid salt with pure water according to the content of 20-50%; hydrobromic acid is added in the dissolving process to adjust the pH value to 3.5-5, and carbonate radicals and bicarbonate radicals in water are removed; after the reaction is completed, stopping aeration and standing, skimming floating glue by adopting an air flotation machine, performing coarse filtration by using a filter bag, and then passing through a ceramic membrane; carrying out coagulative precipitation on the ceramic membrane concentrated water, and carrying out electrochemical experiment to remove COD (Chemical Oxygen Demand) on the supernatant after the coagulative precipitation; electro-catalytic oxidation effluent is returned to the ceramic membrane part for continuous treatment; the pH value of the ceramic membrane clear liquid is adjusted to 7-8 with potassium hydroxide, and then evaporative crystallization is carried out, so that the technical problems that in the prior art, in the process of generating difenoconazole through condensation, the byproduct potassium bromide is difficult to separate, the resource waste is serious, the purity is low, the separation and purification cost is relatively high, and meanwhile, a large amount of wastewater is generated and is difficult to treat are solved.

The invention belongs to the field of bromine recovery from waste circuit board, and particularly relates to a method for recovering high-purity sodium bromide from bromine-containing crude salt. The invention mainly includes the steps of acidification oxidation, multi-stage extraction, and cooperative back extraction. Compared with traditional chlorine oxidation and single urea back extraction technology, the acidification oxidation process can be effectively controlled by reasonable adjustment of the added amount of hydrochloric acid and sodium chlorate, and the tail gas can be absorbed and reused to avoid secondary pollution and resource waste. At the same time, urea is used with sodium carbonate for cooperative back extraction to achieve a high back extraction rate which greatly reduces the amount of urea, and obtains high-purity sodium bromide crystals. The efficient recovery of bromine resources in bromine-containing crude salt is realised. The benefits of the invention are: high product purity, simple operation, environmental friendliness.

The present application relates to the technical field of extracting sodium bromide in high nitrate concentrate, and particularly relates to a process for extracting bromide ions in brine by using flue gas method. The content of bromide ions in high nitrate concentrate produced by evaporation salt system is high, and the high nitrate concentrate is directly reused to the evaporation salt system. In the evaporation and crystallization concentration process of industrial salt, the residual content of bromide ions is high, which seriously affects the quality of industrial salt. In view of the above problems, the present application provides a production process for comprehensive salt production and nitrate production by using high nitrate brine. In the process, compressed flue gas is used to blow Br2 in the solution in the hot blowing tank, and the efficiency is high. In addition to having high gas pressure, the flue gas also has high temperature heat, which makes it easier to separate Br2 in the hot blowing tank from the solution, greatly improving the bromine removal efficiency of the high nitrate concentrate.

This invention provides oil-based fluids comprising a halogen-containing sorbent, which sorbent comprises one or more halogens selected from fluorine, chlorine, bromine, and / or iodine, and one or more substrate materials.

A method for recovering valuable resources in underground brine, comprising the following steps: (1) pretreatment; (2) bromine recovery; (3) lithium recovery; (4) boron recovery; (5) potassium and sodium recovery.The valuable resources in underground brine are fully recovered and utilized; the valuable resources in underground brine are recovered and utilized, which provides strong support for widening the types and reserves of lithium, bromine, potassium and sodium mineral resources in China.

One process involves feeding a bromide brine and removing organic compounds from the bromide brine. The process also includes acidifying the bromide brine to form a stream containing hydrobromic acid and separating the hydrobromic acid from the stream containing hydrobromic acid.

A method for producing and purifying sodium bromide using the coke from waste circuit boards pyrolysis residues as reducing agent, belonging to the field of purifying sodium bromide and high-value utilization, and more particularly, relating to a method for reducing and purifying crude bromine salt obtained from waste circuit boards smelting ash by using the coke in waste circuit boards pyrolysis residues. The main steps are as follows: carbonization conversion, water dissolution, filtration, and concentrated crystallization under vacuum heating. The pure sodium bromide was obtained by reducing crude bromine salt enriched from waste circuit board smelting ash by using the coke in waste circuit boards pyrolysis residues, realizing the resource coupling and high-value utilization of the two wastes, avoiding the secondary pollution in the process of recycling the waste circuit boards. It has the characteristics of simple operation, high resource utilization rate and no tail liquid discharge.

The application provides a purification method of a chromium-containing mixed salt, the mixed salt comprising sodium carbonate, sodium bromide and a heavy metal chromium compound, in the method, a high-purity sodium bromide aqueous solution is prepared from the mixed salt and chromium salt is recovered, and the method comprises the following steps: preparing a crude sodium bromide solution, preparing a chromium removal agent by using a barium compound or a calcium compound, removing chromium from the crude sodium bromide solution by using the chromium removal agent and collecting a filtrate A; and treating the filtrate A to obtain a high-purity sodium bromide aqueous solution. In the method, the sodium carbonate in the crude sodium bromide solution is all converted into sodium bromide; by using the method, the chromium in the sodium bromide is removed and converted into barium chromate or calcium chromate products; the obtained sodium bromide no longer contains the heavy metal chromium and can be directly used for preparing high-purity sodium bromide or preparing a sodium bromide aqueous solution.

The application discloses a system for extracting hydrobromic acid from bromine-containing wastewater and a treatment method thereof, and belongs to the field of industrial wastewater treatment. The system comprises a pretreatment system, a bromide ion extraction device, a transformation agent extraction system and a hydrobromic acid extraction system. The bromide ion extraction device adopts ion exchange resin and can selectively extract bromine in water. The transformation agent extraction system comprises an organic matter removal device, a divalent cation removal device and a concentration device. The hydrobromic acid extraction system comprises a bromine separation device and a distillation device. The system extracts an anion salt with a large content and competitive with bromide ions in water as a transformation agent B, transforms the resin, selectively adsorbs the bromide ions in water by the resin, enriches the bromide ions in water, desorbs the saturated bromide ions in the adsorption to a desorption liquid by regeneration A, and then separates and purifies the regeneration agent A and the bromide ions, or acidifies and purifies to obtain a pure hydrobromic acid solution.

The invention relates to the technical field of gas field water resource development and comprehensive utilization, and particularly discloses a method for recycling valuable elements in gas field water, which comprises the following steps: S1, pretreating the gas field water; s2, the pretreated gas field water is subjected to hardness removal to remove magnesium ions and precipitable ions; s3, carrying out first-stage isothermal evaporation on the hardness-removed gas field water at 50-70 DEG C to concentrate valuable elements; s4, adsorbing and extracting lithium from the gas field water subjected to the first-stage isothermal evaporation concentration by adopting a lithium adsorbent; s5, acidizing the lithium extraction mother liquor, adjusting the pH value to 3.5-5, introducing chlorine gas to oxidize and blow off bromine, and introducing the bromine into a potassium hydroxide saturated solution to generate potassium bromide; s6, carrying out second-stage isothermal evaporation on the bromine extraction mother liquor at 50-70 DEG C, and crystallizing to separate out NaCl; s7, after a large amount of NaCl is separated out, mother liquor continues to be subjected to isothermal evaporation, and potassium mixed salt containing NaCl is separated out. According to the invention, recycling of valuable elements such as lithium, potassium and bromine is realized.

The invention provides a method for purifying chromium-containing mixed salt, the mixed salt comprises sodium carbonate, sodium bromide and a heavy metal chromium compound, in the method, the mixed salt is used for preparing a high-purity sodium bromide aqueous solution, and the chromium salt is recovered; comprising the following steps: preparing a crude sodium bromide solution, preparing a chromium removal agent by using a barium compound or a calcium compound, removing chromium from the crude sodium bromide solution by using the chromium removal agent, and collecting filtrate A; and treating the filtrate A to obtain a high-purity sodium bromide aqueous solution. According to the method disclosed by the invention, sodium carbonate in the crude sodium bromide is completely converted into sodium bromide; by adopting the method, chromium in the sodium bromide is removed, and the sodium bromide is converted into a barium chromate or calcium chromate finished product; the obtained sodium bromide does not contain heavy metal chromium and can be directly used for preparing high-purity sodium bromide or preparing a sodium bromide aqueous solution.

The invention discloses a process method for preparing high-quality sodium bromide from bromine-containing brine in a chlorine-free manner, and belongs to the technical field of chemical production. Ozone is used as an oxidizing agent to oxidize the bromine-containing brine, and meanwhile, a gaseous membrane method bromine extraction process is coupled to prepare the sodium bromide. The method is a green, safe and efficient high-quality sodium bromide preparation technology, chlorine gas does not need to be used as an oxidizing agent, the safety of the production process is greatly improved, the bromine extraction mother liquor does not contain residual chlorine and is environmentally friendly, the obtained industrial sodium bromide product does not contain chloride ions, the main content of sodium bromide is larger than or equal to 99%, and the quality is superior to various indexes specified in the industrial standard HG / T 3809-2006.

This application belongs to the field of wastewater energy and resource utilization technology, and particularly relates to a high-efficiency PTA wastewater treatment system. The system has a single-layer sleeve in the first-stage evaporator and double-layer sleeves in the second and third-stage evaporators. The concentrated liquid is then sent to an incinerator. The high-temperature flue gas generated by combustion, after dust removal, is sent to the outside of the single-layer sleeve of the first-stage evaporator. The single-layer sleeve contains PTA wastewater. The space between the double-layer sleeves in the second and third-stage evaporators contains PTA wastewater concentrated in the previous stage evaporator. High-temperature flue gas from the previous stage evaporator flows outside the double-layer sleeves, while steam generated in the previous stage evaporator flows in the innermost layer of the double-layer sleeves. The ash from combustion is sent to a dissolving tank for dissolution. The filtered filtrate is sent to a first-stage crystallizer for evaporation and crystallization, where sodium carbonate crystals are precipitated and recovered. The remaining mother liquor is sent to a second-stage crystallizer for cooling and crystallization, where sodium bromide crystals are precipitated and recovered. The remaining mother liquor is returned to the first-stage crystallizer. This application achieves energy and resource utilization of wastewater with high efficiency.

This invention provides aqueous fluids which comprise a halogen-containing sorbent comprising one or more halogens selected from fluorine, chlorine, bromine, and / or iodine, and one or more substrate materials, and a zinc-free aqueous brine.

This invention provides aqueous fluids which comprise a halogen-containing sorbent comprising one or more halogens selected from fluorine, chlorine, bromine, and / or iodine, and one or more substrate materials, and a zinc-free aqueous brine.

The invention provides a skid-mounted bromine extraction device for recycling scattered point source bromine resources of oil and gas field produced water, which relates to the field of resource recovery and treatment and is characterized in that a chemical in-situ preparation and addition unit, a bromine ion in-situ oxidation unit and a bromine elementary substance separation and enrichment unit which are communicated with one another are integrated in a container shell; the skid-mounted integrated platform and the intelligent control and energy source unit are used for integrating all the units, the small skid-mounted device is used for concentrating the low-concentration bromine-containing produced water into stable and safe enriched liquid on a well site, and the transportation cost of dispersed materials is reduced. Complicated processes are integrated in a standard container to form a skid-mounted module, the skid-mounted module can be quickly transported to a site and can be operated only by receiving water, connecting electricity and regularly supplying sodium chloride, and the project flexibility and deployment speed are greatly improved. By adopting bipolar membrane electrodialysis to prepare an acid-base raw material solution, replacing chlorine oxidation with electrochemical oxidation, replacing a stripping tower with gaseous membrane separation and combining solar power supply, the whole process is more compact and lower in energy consumption, and accords with the green and low-carbon development direction.

The present invention relates to the technical field of separation and purification of sodium bromide, and specifically to a method for separating and purifying sodium bromide from industrial by-product bromine-containing waste solid. The purpose of the present invention is to provide a method for separating and purifying sodium bromide from industrial by-product bromine-containing waste solid, comprising the following steps: S1, adding hydrochloric acid to the bromine-containing waste solid to neutralize the sodium hydroxide therein, so that the pH value of the solution is 6-8; S2, evaporating, concentrating and drying the solution obtained in S1 to obtain sodium bromide containing sodium chloride impurities; S3, dispersing the sodium bromide containing sodium chloride impurities in anhydrous ethanol to obtain a mixed solution, and then adding chloride ion liquid to precipitate sodium chloride solid; S4, filtering out the sodium chloride solid, evaporating the organic solvent in the mixed solution, and filtering to obtain the sodium bromide solid. This scheme can avoid the consumption of a large amount of steam, avoid the problem of high toxicity and high risk factor of using methanol to separate sodium bromide and sodium chloride, and can significantly improve the separation effect of sodium bromide and sodium chloride.

The invention relates to the technical field of synthesis of ultraviolet light absorbers, in particular to a production process of an electronic-grade ultraviolet light absorber UV-1577. According to the process, the reaction conditions of all the synthesis steps are optimized, parameters such as the raw material adding sequence, temperature and time are accurately controlled, and the yield of UV-1577 is increased; meanwhile, the by-product NaBr is scientifically and reasonably recycled, and the recycled high-purity needle-shaped NaBr crystals are utilized to flatten the production process cost, so that the profit rate is increased; the influence on the environment is reduced while the market competitiveness is improved, and the method has important practical significance and market value for improvement and development of related production processes.

The invention provides a method and a system for synthesizing bromo-carbene by using tetrabromobisphenol A production wastewater, and belongs to the technical field of flame retardants. After the tetrabromobisphenol A production wastewater is subjected to evaporation concentration and pH adjustment, a mixed salt solution with high organic concentration is obtained, and the mixed salt solution with high organic concentration reacts with bromo-carbene in the presence of a catalyst, so that bromo-carbene is synthesized. According to the method, a plurality of complex organic mixtures in the wastewater are subjected to a series of chain scission recombination step by step through three times of oxidation in sequence and accurate condition control, and finally, a large number of various brominated organic compounds contained in the tetrabromobisphenol A production wastewater are converted into single-chain bromine-containing organic substances. And high-activity organic matter bromo-carbene and inorganic sodium bromide salt are generated through a synthesis reaction, so that the resource utilization of the bromine element in the wastewater is realized, the utilization value of the wastewater is improved, and a new treatment path is provided for difficult wastewater treatment generally existing in tetrabromobisphenol A production.

The application provides a PTA industry chemical waste salt resource treatment method, which comprises the following steps: firstly, dissolving and filtering the chemical waste salt containing sodium carbonate and sodium bromide; vacuum evaporating and crystallizing the filtered filtrate, controlling the evaporation ratio, and obtaining an industrial-grade sodium carbonate product with high purity; evaporating the mother liquor into a cooling crystallizer to separate and obtain sodium carbonate decahydrate for reuse; after being concentrated by an evaporation crystallizer, the cooled mother liquor is introduced into a sodium bromide cooling crystallizer to separate and obtain an industrial-grade sodium bromide product, and part of the sodium bromide crystallization mother liquor is recycled and part is taken out for drying. The crystallization process combining evaporation crystallization and cooling crystallization can effectively recover valuable components in the PTA industry chemical waste salt, without adding additional raw materials and chemical additives to assist production, without causing secondary pollution of waste water and additional solid waste output; low energy consumption and low cost realize the resource of the chemical waste salt, greatly reduce the hazardous waste treatment cost, solve the environmental protection problem, and have great economic benefits.