111results about "Alkali metal bromides" patented technology

In a method for homogeneously and dust-free coating of a phosphor or a scintillator layer onto a flexible substrate, in order to obtain a plurality of phosphor or scintillator sheets or panels having flexible supports or substrates, a coating procedure within a sealed zone is performed, wherein said zone comprises at least two cylindrical carrier rollers for carrying a flexible substrate exceeding dimensional formats of desired phosphor or scintillator sheets or panels with a factor of at least 5, wherein said cylindrical carrier rollers each have an axis in a parallel arrangement with one another; wherein said zone comprises at least one crucible containing a mixture of raw materials providing desired phosphor or scintillator compositions for said layer; and wherein said zone comprises a laminating unit; wherein said method comprises the steps of mounting said flexible substrate onto said carrier rollers, vapor depositing said phosphor or scintillator layer having a desired phosphor or scintillator composition onto said flexible substrate, and laminating said phosphor or scintillator layer, thereby covering said layer with a protective foil; further comprising the step of cutting said layer into sheets or panels having desired formats, and wherein at least during said vapor depositing step said zone is maintained under vacuum conditions as a vacuum chamber.

The invention provides a method for recovering refining sodium bromide from dipropyl cyanoacetate mixture. The method comprises the following steps: filtering a dipropyl cyanoacetate mixture containing sodium bromide, filtering and colleting sodium bromide, dissolving sodium bromide, adjusting the pH value to 6-6.5 by hydrobromic acid, adding an extraction agent of an ether and alkane mixture, stirring for mixing, standing and layering; separating water liquid, boiling, cooling to 80 DEG C, adding an active carbon and diatomite mixed decolorizing agent, decolorizing at 50-80 DEG C, filtering, and conducting spray drying on the filtrate to obtain a white powdered anhydrous sodium bromide with high purity and high recycling rate.

A method for producing halide brine wherein an alkali and a reducing agent are added to an aqueous fluid having a density greater than 8.30 lb/gal., (0.996 kg/L) water, waste water or sea water for example. The resulting fluid is then contacted with a halogen to form a halide brine. The reaction occurs in a conventional reactor such as a mixing tank.

The invention relates to a method for preparing sodium bromide by continuous multi-stage air blow in deep marine facies potassium-rich brine. Bromine-containing brine is processed by the working procedure of acidification and oxidation, heating air blow, washing, absorbtion and concentration, so that the sodium bromide can be prepared. The method has the advantages of simple technological equipment, low production cost and energy consumption, high product purity and yield, strong practicability and better economic and social benefits.

A method for degrading Rhodamine B including: mixing BiOBr and Rhodamine B; and irradiating the mixture with a radiation having a wavelength of from 440 nm to 554 nm. The Rhodamine B may be in an aqueous solution. The BiOBr may be added to the aqueous solution of Rhodamine B in an amount of from 0.2 to 0.5 mg/ml. The BiOBr may have a sheet-like structure with particles having a diameter of from 3 μm to 5 μm. The BiOBr may be in a pure crystal tetragonal phase.

The invention relates to water-soluble sodium halide micro-particles, and a preparation method an application thereof. The water-soluble sodium halide micro-particles has a sodium-chloride-type crystal structure and at least one morphology and dimension of the following: the particles are cube, rhombic dodecahedron, regular octahedron, sphere or sphere-like shape, hexagonal-shaped petals or hexagonal star-shape, six-sided funnel-shape, octagonal-shaped petals, or nano-wires with three-dimensional size of 50 nanometers to 20 micrometers.

The invention relates to a PTA incineration boiler ash residue solution salt separation crystallization process, and belongs to the technical field of evaporative crystallization. The process comprises the following steps of: dissolving ash of the PTA incineration boiler with waste heat into a nearly saturated solution of sodium carbonate and sodium bromide, and removing metals and other insoluble substances from the solution by adopting a metal sintering filter, separating the obtained filtrate by adopting an evaporative crystallization method to obtain sodium carbonate monohydrate crystals, removing sodium carbonate from the mother liquor by adopting a replacement method, and then separating by adopting an evaporative crystallization method to obtain sodium bromide crystals. Sodium carbonate and sodium bromide in the PTA boiler ash are separated and recovered by adopting an evaporative crystallization method, the process flow is simple, the operation conditions are simple, convenient and stable, and industrialization is facilitated; the high-purity sodium carbonate and sodium bromide recovered by the method can meet the quality requirements of industrial-grade products and can be directly recovered and reused or sold as by-products, so that the purpose of treating waste residues and wastewater is achieved, the requirements of the current environmental protection situation are met, waste can be turned into wealth, recycling of salt is realized, and the benefits of factories are improved.

The invention discloses a method for treating wastewater produced by methylation reaction in metribuzin synthesis. In the method, the wastewater produced by the methylation reaction in the metribuzin synthesis is added with an acidic treating agent, and the obtained mixture is heated to 90 DEG C-120 DEG C and refluxed for deodorization and decolorization; and volatile gas in the wastewater and gas produced in the reflux are absorbed by alkaline solution for deodorization. Methanol in the wastewater is recovered by a batch distillation method. Residual liquid is heated to 100 DEG C-150 DEG C for evaporation, and then the residual liquid is naturally cooled by stirring until sodium bromide crystal is separated out. Filtrate is oxidized by an oxidant at the oxidation temperature of 50 DEG C-80 DEG C. A system is cooled to 10 DEG C-40 DEG C, and bromine in the system is extracted by an organic extractant, thus obtaining organic phase extracting solution with the bromine. The method helps solve the problem of treating methylated wastewater in metribuzin production, and reduce environmental pollution and production cost, the recovery rate of the bromine reaches more than 93%, and the method has good use value, and is simple and feasible.

The present invention uses bromide and sodium (potassium) hydroxide as raw material, makes them produce disproportionation reaction, regulates specific weight and pH value, uses hydrogen peroxide to remove free bromine, and adopts the processes of cooling and dewatering to separate sodium (potassium) bromate crude product, and makes the mother liquor undergo the processes of dewatering and concentration to obtain sodium (potassium) bromide crude product. The sodium (potassium) bromide crude product is disclosed, and undergone dthe processes of removing small quantity of sodium (potassium) bromate by using urea, filtering, dewatering, concentrating, drying and packaging to obtain sodium (potassium) bromide finished product. The sodium (potassium) bromate crude product is undergone the processes of dissolving, filtering, dewatering, concentrating, drying and packaging so as to obtain sodium (potassium) bromate finished product.

The present invention relates to a non-hazardous brominating reagent from an aqueous alkaline bromine byproduct solution obtained from bromine recovery plant and containing 25 to 35% bromine dissolved in aqueous lime or sodium hydroxide containing alkali bromide and alkali bromate mixture having bromide to bromate stoichiometric ratio in the range of 5:1 to 5.1:1 or 2:1 to 2.1:1 and a pH ranging between 8-12 and also relates to a method for borminating aromatic compounds by using the above brominating agent

The invention discloses a preparation method for sodium bromide. The method comprises the following steps: acidizing and oxidizing; blowing out air; absorbing for three times; concentrating, separating and drying end products. When the method is adopted, the bittern is at room temperature and needs not be heated, so that the energy can be saved; the blown molecular bromine needs not be washed; the process is simplified; air is sealed and recycled; no environmental pollution is caused; the one-blowing three-absorbing process is adopted, the absorbing is sufficient, the absorbing efficiency is high, the extracting ratio can reach 97% or above and 99% excellent sodium bromide end product is acquired; according to the method, the waste water after potassium extraction can be utilized to extract bromine; the sodium bromide product can be further produced; the resource reutilization can be realized.

The invention provides a method and a device for recovering bromine elements and sodium elements from PTA tail gas treatment waste liquid, relates to the technical field of treatment of oxidation waste liquid of terephthalic acid, and solves the problems that in the prior art, the PTA waste liquid is discharged only through sulfuric acid neutralization and biochemical treatment; the loss of high-value materials such as sodium bicarbonate, sodium carbonate and sodium bromide is easily caused. The recovery method comprises the following steps: carrying out concentration treatment on pretreated waste liquid to form a concentrated solution; adjusting the pH value of the concentrated solution to be alkaline, and performing evaporative crystallization on the concentrated solution to obtain sodium carbonate crystals and/or sodium bicarbonate crystals; carrying out special nanofiltration treatment on the evaporated and crystallized mother liquor to obtain a sodium bromide fresh water solution; the sodium bromide fresh water solution is concentrated, a high-concentration sodium bromide solution is obtained, follow-up evaporative crystallization or bromine extraction treatment is facilitated, solute in the waste liquid can be recycled and converted into product salt with high economic value, and the remaining waste liquid is more beneficial to follow-up treatment and discharge.

The invention provides a method for separating bromine from synergistic smelting ash of circuit boards through roasting with sodium nitrate, belongs to the field of comprehensive recovery of valuableelements from ash through a whole wet method, and particularly relates to a method for efficiently separating and extracting bromine, lead and zinc from synergistic smelting ash of circuit boards through roasting with sodium nitrate. The method mainly comprises the steps of mixing, roasting, step-by-step regulation of pH with industrial sulfuric acid to separate and extract lead and zinc, evaporative crystallization of bromine to recover coarse bromine, smoke treatment and the like. Compared with a traditional ash comprehensive recovery process, oxidization of cuprous bromide and solidification of bromine are achieved through roasting with sodium nitrate, so that conversion and separation of soluble bromine, lead and tin are achieved; a sodium hydroxide and nitric acid system is used for smoke treatment, ash and nitrate generated in the roasting process are recovered to be used repeatedly, and thus, pollution caused by smoke and tail liquid is avoided in the recovery process.

The invention discloses a method for producing high-purity N-alkyl imidazole, comprising the following steps of: a, putting imidazole and alkali metal hydroxide or alkaline-earth metal hydroxide into a reaction bottle in a mol ratio ranging from (1: 0.5) to (1: 1.5); violently agitating at 90-150 DEG C for 0.2-24 hours; b, reducing the temperature to 0-60 DEG C and adding tetrahydrofuran (THF), wherein the ratio of the volume THF to the mass of the imidazole is (1-100): 1; c, adding alkyl halide according to the mol ratio ranging from (1: 0.8) to (1: 1.5) (imidazole to RX); reacting at 20-80 DEG C for 4-48 hours, wherein R is any one of straight-chain alkyl with a carbon number of 1-16, naphthenic base with a carbon number of 3-8, allyl, propargyl and benzyl, and X is any one of chlorine and bromine; d, after the reaction, filtering; utilizing the THF which is 10% of the previous volume to wash a solid for three times; dissolving the solid into a suitable amount of hot water to carry out crystallization and purification, and obtaining a by-product to be stored for other use; and e, distilling the THF from an organic phase, and recycling; and finally, rectifying residual liquid to obtain a high-purity product. The method disclosed by the invention has the advantages that 1, the process is simple to operate; water-removing operation is not needed after a first-step reaction, and a second-step reaction is directly carried out; 2, the product is high-purity colorless transparent liquid or white solid; and 3, the synthesizing time is short, suitable conditions are wide and pollution to the environment is small, so that the method is suitable for industrial production.

The invention relates to a method for recovering and recycling sodium bromide from diethylbutylmalonate waste water. The method comprises the following steps of: sending waste water which is generated in a production process of diethylbutylmalonate and contains sodium bromide into an evaporator, and introducing steam into the evaporator to ensure that water in the waste water is evaporated out by using the steam; when the waste water is evaporated and concentrated to the condition that residual water accounts for 8-12 percent of the weight of the sodium bromide, sending an obtained concentrated solution into a cooling pot for cooling to obtain a solid sodium bromide crystalline hydrate; and sending the solid sodium bromide crystalline hydrate to an industrial production line of the diethylbutylmalonate for recycling by using the solid sodium bromide crystalline hydrate as a raw material. The invention provides the method for recovering the solid sodium bromide crystalline hydrate from the waste water generated in the production process of the diethylbutylmalonate and for recycling and producing the diethylbutylmalonate by using the solid sodium bromide crystalline hydrate as a raw material. When the method is used for recovering the sodium bromide, the method has low recovery cost and high recovery rate; meanwhile, the production cost of the diethylbutylmalonate is also greatly reduced.

The invention belongs to the technical field of halogen element salt separation, and particularly relates to a method for separating sodium chloride and sodium bromide by an organic solvent. The organic solvent is added into dry sodium chloride and sodium bromide mixed salt; stirring dissolution is performed at normal temperature; filtering is performed; undissolved salt is filtered out; filteringliquid is heated to be evaporated; methanol is evaporated out; the temperature is lowered for crystallization; filtering is performed; crystallized salt is filtered out; the content of sodium bromidein the salt reaches 90 weight percent or higher; the filtering liquid is continuously heated and evaporated; the rest methanol is evaporated out; the temperature is lowered for filtering; a finishedproduct sodium bromide salt is obtained; all evaporation recovered methanol is used again for next batch of dissolving salt. The method for separating sodium chloride and sodium bromide by the organicsolvent has the advantages that the separation equipment is simple; the operation cost is low; the process is reasonable; the realization is easy; the recovery rate is high; no waste water is generated; no environment pollution exists; the industrialization can be easily realized.

The invention belongs to the field of resource utilization of bromine-containing brine such as salt lakes, seawater, underground brine, industrial wastewater and the like, and particularly provides amethod for preparing hydrobromic acid and sodium bromide from bromine-containing brine in a short process. The technological process mainly comprises the steps of bromine-containing brine oxidation, alkaline solution absorption, hydrobromic acid preparation through distillation, sodium bromide preparation through crystallization, and the like. The technology provides a brand-new process scheme forpreparing hydrobromic acid and sodium bromide by extracting bromine from brine, and compared with a traditional process, the process flow is greatly shortened, the process is simple, industrialization is easy, and the application prospect is wide.

The invention provides a technology for recovering bromine element from mother liquor extract of an oxidation process of a terephthalic acid production device, and belongs to the field of process recovery. The mother liquor extract of the oxidation process of the terephthalic acid production device mainly contains acetic acid according to the material content, and acetic acid is used as a solventto dissolve cobalt ions, manganese ions, bromide ions, BA, sodium ions, iron ions, 4-CBA, PT acid and the like with relatively low concentrations. The bromine element is extracted by using the technology to achieve recovery in a form of hydrobromic acid or sodium bromide, and the economic value of the bromine element is recovered; and the situation that in the prior art, bromine is discharged intosewage, the bromine element can cause adverse effects on biological florae of a sewage treatment unit, and the activity of the biological florae is affected is also avoided.

The invention relates to a method for recovering sodium bromide from bromine-containing wastewater. The method comprises the following steps: adjusting the pH value of the bromine-containing wastewater with acid, adding a solvent for washing and distilling a water layer to dryness; and adding a solvent into a material obtained after distilling, carrying out smashing, then carrying out filtering to remove impurity salts, and subjecting a filtrate to concentration so as to obtain sodium bromide. The method provided by the invention is easy to operate and friendly to environment and can prepare a crude sodium bromide product with a purity of 90%. The method is low in cost, low in requirements on equipment, simple to operate, friendly to environment and suitable for industrial production.

The invention discloses a process for producing salt through concentrating strong brine after sea water desalination adopting two-way cycle method and bromine extraction. The process comprises the following steps of A, preparing fresh water and strong brine from sea water through a reverse osmosis process in a high-pressure reverse osmosis unit, wherein the concentration of the prepared strong brine is 70000-80000PPM; and B, performing fresh and concentrated separation on the strong brine with the concentration of 70000-80000PPM by utilizing a concentration difference method by adopting two-way cycle until the strong brine is crystallized. The salt is produced by carrying out sea water desalination on the strong brine, the problem that pollution is caused due to discharge of the strong brine after sea water desalination is solved, the yield in unit area is 30-50 times of the yield of a salt pan producing method, and the cost is far lower than that of salt pan production.