12results about "Alkali metal bromides" patented technology

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.

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 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.

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.

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.

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.

The invention relates to a salt-containing wastewater resourceful treatment technology, in particular to a method for recovering fluorine, chlorine and bromine from flue gas deacidification waste liquid, which comprises the following steps: (1) preparing a calcium sulfate dissolving solution; (2) carrying out precipitation reaction on the dissolving solution and the flue gas deacidification waste liquid to obtain calcium fluoride and primary precipitation reaction mother liquor; (3) carrying out precipitation reaction on the primary precipitation reaction mother liquor and a calcium chloride solution, and separating to obtain calcium sulfate and secondary precipitation reaction mother liquor; (4) reacting the secondary precipitation reaction mother liquor with sodium carbonate to obtain calcium carbonate and calcium-removed mother liquor; (5) reacting the calcium-removed mother liquor with hydrochloric acid to obtain neutralized mother liquor; (6) performing evaporative crystallization on the neutralized mother liquor to obtain sodium chloride, evaporative crystallization mother liquor and condensed water; and (7) cooling and crystallizing the evaporative crystallization mother liquor to obtain sodium bromide crystals and cooling crystallization mother liquor. According to the method disclosed by the invention, fluorine and bromine can be separated and recovered from the flue gas deacidification waste liquid at low cost, and meanwhile, new wastewater or solid wastes are prevented from being generated.

The invention provides a method and a system for producing bromine by aeration. The method can be implemented by using existing equipment and is simple and convenient to operate. The method comprises the following steps: acidifying the bromine-containing brine, then oxidizing the bromine-containing brine, aerating the oxidized liquid, finally absorbing bromine and the like. Sodium hydroxide is adopted as an absorbent for sodium hydroxide circulation absorption, hydrochloric acid is added into absorption liquid, and Br <-> is oxidized into free bromine.

Economically and environmentally beneficial processes for the preparation of lactic acid are provided. The processes produce lactic acid with concurrent recovery and reuse of residues formed in the processes thereby being essentially free of undesired by-products.

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.