127 results about "Bromine water" patented technology

The invention discloses a method for preparing halogenated aryl compounds through oxidation and halogenation. In the method, chlorine gas, bromine water or elementary iodine are prevented from serving as a halogenating agent, and in an aqueous phase or ionic liquid reaction medium, bidirectional ionic liquid is taken as a catalyst, hydrogen peroxide (commercial 30 percent aqueous solution) is taken as an oxidant, aryl compounds and halogeno salt (or haloid acid) are subjected to oxidation and halogenation to form the halogenated aryl compounds. The method is a green synthesis method; and the prepared halogenated aryl has high selectivity and yield, reaction conditions are mild, volatile organic solvents are not needed in the reaction, and the catalyst can be recycled.

The invention discloses a method for observing real topography of nonmetallic inclusion in steel, which belongs to the technical field of steelmaking and continuous casting. The method comprises the following steps: preparing a metallographic model, then mixing several of organic solves such as bromine water, methanol, ethanol, acetone and the like to form buffer solution, adding KCl or NaCl or HCl solution into the buffer solution to form electrolyte, performing surface electrolysis corrosion on the polished metallographic model by using the electrolyte, and controlling the corrosion thickness by controlling electrolysis current and electrolysis time, wherein the nonmetallic inclusion is highlighted on the mirror face of the metallographic model after the corrosion and the real topography of the nonmetallic inclusion with different dimensions is completely represented. The three-dimensional real topography of the nonmetallic inclusion is observed through a metallographic microscope or a scanning electron microscope or a field emission scanning electron microscope. The application and popularization of the method are favorable for deeper comprehension and development of people on the formation, transformation and removal of the nonmetallic inclusion during the steelmaking and continuous casting, and have great guide significance for high-purity steel production.

The invention relates to a determining method for lead contents in gold concentrate and lead concentrate and belongs to a determining method for lead contents in ore and concentrate. The determining method comprises the following steps of using nitric acid, bromine water and sulfuric acid to digest a sample, and using hydrobromic acid and dilute sulphuric acid to treat for removing the interference of elements such as arsenic, antimony, selenium and tin in the sample to lead determination; then adopting sulphuric acid and lead to form lead sulfate precipitation, and filtering and separating out other interference elements; transferring the precipitation and filter paper to an acetic acid-sodium acetate buffer solution, enabling a mixture to generate lead acetate and dissolving in the buffer solution; taking xylenol orange as an indicator, and using a Na2EDTA standard titration solution for titrating. The accuracy, the precision and the reproducibility of the method disclosed by the invention can completely reach the determination requirement of the lead contents; meanwhile, the method has the advantages of simplicity and convenience in operation and high efficiency, and has important significance for quality monitoring, metal balance and trade pricing.

The invention discloses a preparation method for a fullerene amino acid derivative, which relates to a preparation method for a fullerene derivative and is mainly used for solving the problems of low bioactivity and limitation on selectable amino acids existing in a fullerene amino acid derivative prepared with the prior art. The method comprises the following steps of: I, uniformly mixing an amino acid with a phase transfer catalyst, and adding alkaline bromine water to obtain a mixture; II, adding a toluene solution of fullerene into the mixture to obtain a reaction product; and III, extracting the reaction product, eluting with gel chromatography, and concentrating and drying a collected eluent to obtain the fullerene amino acid derivative. The preparation method has the advantages that: I, the bioactivity of the fullerene amino acid derivative is high; and II, the fullerene amino acid derivative can be prepared by reacting an amino acid only containing alpha amino with fullerene. The preparation method is mainly used for preparing the fullerene amino acid derivative.

The invention discloses a method for producing edible salt from sea water through an industrial process and a processing device of the edible salt. The method for producing edible salt from sea water through the industrial process comprises the following steps: extracting seawater, preprocessing, concentrating, preheating, concentrating and crystallizing. The processing device of the edible salt comprises a preprocessing unit, a reverse osmosis unit, a pre-heater, a mechanical steam recompression evaporation device and a post-processing unit. Compared with the salt pan method, the method has the advantages that the large quantity of soil is saved; meanwhile, the influence of season is avoided, the investment is low and the labor is saved. By taking annual output of 50000 tons of edible salt as an example, an area of nearly 2500 acres is occupied in the salt pan method, but an area of only 50 acres is occupied in the method; the number of the required persons in the method is only 1/10 that of the required persons in the salt pan method; the basic investment for producing every ton of salt through the method is only 1/5 that of the salt pan method; the purity and the concentration of brine of the method are higher than those of the salt pan method; important chemical raw materials such as calcium sulfate, magnesium sulfate, potassium chloride, calcium chloride and bromine water can be extracted from the crystallized bittern; the energy needed for operation of the device is clean energy which is electric energy; the device is high in degree of automation, capable of continuously producing the salt in 24 hours, free of steam and really emission-free and pollution-free.

The invention discloses a green method for producing tetrapropylammonium hydroxide by using a membrane technique and belongs to the technical field of membrane separation chemical engineering. The method comprises the following steps: pretreating a tetrapropylammonium bromide solution by using a security filter and the like, further passing through a bipolar membrane electrodialysis device so as to obtain tetrapropylammonium hydroxide and hydrobromic acid, further performing electrodialysis on the obtained tetrapropylammonium hydroxide, further concentrating to be 17% or above, and recycling an electrodialysis dilution as a bipolar membrane device alkali chamber receiving liquid for a next batch of liquid treatment. A conventional method that tetrapropylammonium hydroxide is produced from tetrapropylammonium bromide through point solution is replaced, bipolar membrane electrodialysis and electrodialysis techniques are comprehensively utilized, production of high-danger bromine water is effectively avoided, and compared with a conventional process, the method has the advantages of being low in energy consumption, high in product purity and small in environment pollution.

The invention discloses an analyzing method for quickly and precisely measuring tellurium in a tellurium smelting process. The measuring range of the tellurium in material is 20-95% of mass percent. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process mainly includes steps that weighing a certain amount of sample, adding a proper amount of hydrochloric acid, nitric acid and sulfuric acid dissolving sample, adding bromine water to shield As and Sb interference, and using ammonium ferrous sulfate to titrate the tellurium content under a proper amount of potassium dichromate and thiophosphate. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process uses standard addition test and parallel test to verify the accuracy and precision of the method; the analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process is high in precision and capable of meeting the actual needs of the analysis and detection for the tellurium content in the material in the tellurium production process.

The invention discloses a method for purifying simple substance bromine from hydrobromic acid mother liquor. The method comprises the following step of: treating the hydrobromic acid mother liquor sequentially through the working procedures of primary oxidization, cooling, first-stage separation, secondary oxidization, second-stage separation, and the like. In the invention, the hydrobromic acid mother liquor is led into a first-stage bromine water separation flask, free chlorine directly oxidizes the mother liquor, and reacted bromine is separated through a second-stage separation flask to prepare a finished fine bromine product. Through the secondary separation, the chlorine content in the bromine is reduced to be below 0.01 percent from 0.05 percent, thereby greatly improving the purity of the finished bromine product.

The invention relates to a method for synthesizing a hydrophile adsorption chromatography medium which takes gallic acid as the petunidin and the agarose gel with high concentration and high crosslinking degree as the stroma. The high concentration and high crosslinking agarose gel medium surface has high density reactionable hydroxyl group which is activated with allyl bromide followed by reacting with bromine water, and then gallic acid is added, and the prepared medium can be used as a hydrogen bond supplyer in the hydrophile adsorption reaction. The medium prepared by the synthesis method has strong rigidity, high petunidin density, high selectivity, and is fit for separating polyphenol protein, hydrophilic polypeptide and natural small organic molecules.

The invention discloses an ethyne hydrochlorination precious metal mercury-free catalyst regeneration method which includes the steps: first, performing drying treatment; second, performing soaking treatment by the aid of regenerated reagent bromine water, sodium thiosulfate, potassium thiocyanate, thiourea and the like; third, performing drying treatment to obtain a regenerated catalyst. The performance of the inactivated precious metal mercury-free catalyst can be restored, so that the precious metal mercury-free catalyst can be recycled, use cost is greatly reduced, and operation is simple.

The invention relates to a method and a device for producing bromine from brominated butyl rubber wastewater through steam distillation. The device comprises a preheater (1), a distillation tower (2), bromine steam condensers (3), a bromine-water separator (4), a primary bromine distillation tower (5), primary bromine condensers (6), a secondary bromine distillation tower (7), a secondary bromine condenser (8), a tertiary bromine distillation tower (9), a tertiary bromine condenser (10), a fine bromine condenser (11), non-condensable gas condensers (12) and a chlorine gas recovery tower (13). The method and the device for producing bromine through steam distillation are adopted to treat wastewater in brominated butyl rubber production, more than 90% of bromine is recovered, drained wastewater reaches the standard, and an enterprise is environmental-friendly; and meanwhile, recovered bromine can be used as a raw material for brominated butyl rubber production of the enterprise, so that the enterprise cost is reduced, and the economic benefit is increased.

The invention discloses a method for extracting bromine from tetrabromobisphenol A wastewater, and belongs to the field of tetrabromobisphenol A production. Wastewater discharged in the tetrabromobisphenol A production process is subjected to triple-effect desalination concentration, acidification, primary distillation and condensation to obtain crude bromine, the crude bromine is absorbed by AN alkali liquor, then enters a second distillation tower and undergoes secondary distillation, bromine gas generated by the secondary distillation is condensed, and bromine water is separated to obtain finished bromine. The method has the following advantages: the influence of sodium bromide concentration and enrichment of a triple-effect desalination system on a production device in the wastewater treatment process of tetrabromobisphenol A is avoided, the treatment effect of triple-effect evaporation is improved, qualified bromine is obtained, and the recycling of bromine resources is realized.The method is simple in technological process, common equipment is adopted, the investment cost is low, and good economic benefits can be obtained through the extracted bromine.

The present invention relates to a mixture with dichlorosilane and ammonolysis modified synthesized silicon ceram usher and the relative preparation method. The methylnaphthohydroquinone dichlorosilane is mixed with the dimethyl dichlorosilane in the anaerobic condition (vacuum or protection with inert gases), and then the ammonia gas is added into to make with ammonolysis reaction; then the acetal is added into the solution of bromine water and sodium hydroxide to make with the chemical reaction. After finishing the reaction, silicon oxide ammonia alkyl usher with liquid state or solid state are respectively obtained. The present invention uses the isocyanate created by in suit and the modified dichlorosilane to be mixed and made with ammonolysis reaction to produce the silicon oxide ammonia alkyl and moreover to obtain the silicon oxide ammonia alkyl usher. The present invention is characterized in lower toxicity of the reacting system, controllable reaction condition and lower cost and so on.

The invention relates to a copper salt absorption liquid for desorbing arsenic hydride from ethane and propene in gas phase and an online monitoring system. The absorption liquid is composed of the mixed liquid of bromine water, hydrogen peroxide, copper salt and inorganic acid. The online monitoring system comprises a sampling system, a gas-phase chromatographic separation system and a mass spectrum analysis system, wherein a six-way valve of the sampling system is used for sampling continuously; and the gas-phase chromatographic separation system is used for separating the arsenic hydride from the ethane and the propene, and then the mass spectrum analysis system is used for monitoring quantitatively. The absorption liquid provided by the invention has the advantages of simple ingredient and low cost. The arsenic hydride in the ethane and the propene can be desorbed to a content of smaller than 30ppb. The online monitoring system has the advantages of high sensitivity, low limit of detection and capability of rapidly reflecting the absorbing and purifying effect of the absorption liquid.

The invention relates to the field of etching agent application, in particular to an etching agent for displaying the low alloy wear-resistant steel original austenite grain boundary and application of the etching agent. The etching agent is prepared through the step that picric acid, sodium dodecyl benzene sulfonate, a tableware cleaner, distilled water, potassium thiocyanate and bromine water are heated to 70 DEG C; and when the etching agent is applied, a metallographic specimen is firstly prepared, the metallographic specimen is subject to coarse grinding, fine grinding and polishing to be etched through the prepared etching agent for 40 s, and the original austenite grain boundary of the specimen is observed through a scanning electron microscope. The etching agent is simple in manufacturing method, and application operation is easy, convenient, safe and rapid.

The invention belongs to the chemical engineering field, and particularly discloses a method for preparing 3,4-dichloro bromobenzene. The method comprises steps of adding reduced iron powder into the raw material o-dichlorobenzene, inletting bromine water under certain pressure and temperature, and carrying out bromination reaction in a bromination kettle; carrying out multistage crystallization on the crude bromized 3,4-dichloro bromobenzene through solution, so as to purify the 3,4-dichloro bromobenzene, wherein the crude bromized 3,4-dichloro bromobenzene is crystallized by at least one stage, generally by multiple stages, namely, from one stage to three stages, so that a complete cycle of crystallization and purification of the 3,4-dichloro bromobenzene product is formed. The method has the main beneficial effects that the product is not polluted by foreign solvents or other materials, for the byproduct 2,3- dichloro bromobenzene generated in preparation of 3,4-dichloro bromobenzene through o-dichlorobenzene is used as the solvent; particularly, reduction of the yield of 3,4-dichloro bromobenzene caused by intensified side reaction of the 2,3- dichloro bromobenzene due to rectification high temperature is avoided; the method has the characteristics of high yield of the product, high purity and high production efficiency.

The invention belongs to the technical field of synthesis of 2, 6-dibromo-4-nitroaniline and bromine, and particularly relates to a co-production method and device for 2, 6-dibromo-4-nitroaniline and bromine. The method includes the following steps: (1) reacting paranitroaniline with bromine in a hydrochloric acid medium at 40 DEG C-50 DEG C to generate 2, 6-dibromo-4-nitroaniline and hydrobromic acid, and reacting chlorine gas with hydrobromic acid to generate hydrochloric acid; (2) adding hydrochloric acid generated in the step (1) into brine, subjecting brine to acidification, blowout, absorption, distillation and condensation, and enabling brine to enter a bromine water separator for separation to prepare bromine; and (3) adding bromine obtained in the step (2) dropwise into a reaction kettle in the step (1) to prepare 2, 6-dibromo-4-nitroaniline. The device comprises a bromine producing unit and a 2, 6-dibromo-4-nitroaniline producing unit communicated with the bromine producing unit. The co-production method and device save the raw material cost and simplify the production technology.

The invention discloses a preparation method for thallous chloride based on interface interaction, belonging to the technical field of preparation of metallic compounds. The preparation method comprises the following steps: extracting Tl<+> with sulfate ash, dilute acid and dilute acid containing F<-> as raw materials and then oxidizing the Tl<+> into Tl<3+> by using bromine water; adsorbing Tl<3+> by using hydrochloric acid-modified active carbon, and reducing and eluting Tl<+> from the hydrochloric acid-modified active carbon by using an ammonium oxalate solution so as to obtain a Tl<+> eluate; and adding chloride into the Tl<+> eluate and carrying out stirring and heating to allow a TlCl crystal to be precipitated. The preparation method of the invention can shorten extraction time andprepare purer thallous chloride.

The invention relates to a method for compounding CeO2/AgBr composite microsphere visible-light-driven photocatalysts in two steps under a mild condition. The method is characterized by using alcohols as a reaction solvent, using cerium acetate hydrate, silver nitrate and saturated bromine water as raw materials, assembling CeO2 into microspheres under a hot-alcohol condition, simultaneously using the alcohol to carry out reduction on Ag+ and enabling the Ag+ to be immobilized on the microspheres, and then using the bromine water to carry out oxidation to obtain the CeO2/AgBr composite microsphere visible-light-driven photocatalysts. Due to unique effects of CeO2 and AgBr, the compounding probability of photo-generated electron hole pairs can be effectively reduced, and meanwhile the stability and the photocatalytic activity of the AgBr are enhanced. The CeO2/AgBr composite microsphere visible-light-driven photocatalysts prepared through the method can be widely applied to the fields of environmental pollution improvement, preparation of photocatalysis function materials and the like.

The invention discloses a method for preparing 6-bromine-3-hydroxyl-2-pyrazinecarboxamide by using 2-carbamoyl pyrazine-3-sodium hydroxide, and belongs to the field of chemical engineering. The method comprises the following steps: dissolving 2-carbamoyl pyrazine-3-sodium hydroxide and a catalyst in a solvent, dropwise adding a bromine reagent, performing stirring to react to generate 6-bromine-3-hydroxyl-2-pyrazinecarboxamide, performing stirring and crystallizing in ice water, and performing filtering to obtain a pure product of 6-bromo-3-hydroxyl-2-pyrazinecarboxamide. Compared with a traditional method, the method for dropwise adding bromine water has the advantages that the reaction time is greatly shortened, the production operation is simplified, the production efficiency is improved, the whole reaction route is clean and environment-friendly, and the method is suitable for industrial production.