88 results about "Bromide salt" patented technology

The invention belongs to the technical field of flow battery energy storage, and discloses a multifunctional electrolyte for a zinc-bromine flow battery, a preparation method and the zinc-bromine flow battery, and the multifunctional electrolyte for the zinc-bromine flow battery comprises bromine salt, a conductive additive, water, choline bromide and N-methyl-N, N-bis (2-hydroxyethyl)-1-propylamine bromide. The molar ratio of the choline bromide to the N-methyl-N, N-bis (2-ethoxyl)-1-propylamine bromide is (0.5 to 9): 1. Based on a'synergistic 'effect and an'antagonistic' effect of a polyhydroxy structure and a choline group, effective balance between homogeneous phase performance, anti-freezing performance and the like of the electrolyte can be realized, so that the performance of a battery is improved.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

The invention discloses an aluminum oxide coated diaphragm and a preparation method thereof in the field of lithium ion battery diaphragms. The diaphragm comprises aluminum oxide particles, a fluorine-containing porous organosilicon compound, a phosphorus heterocyclic covalent organic framework, a binder, a dispersant and deionized water. The fluorine-containing porous organosilicon compound is prepared by mixing methyltrimethoxysilane, perfluorohexyltrimethoxysilane and water, adding ammonia water to adjust the pH value, then reacting to form a sol-gel system, adding amino silane to continue reacting, and then carrying out rotary evaporation, calcination and grinding. The phosphorus heterocycle covalent organic framework is prepared by dissolving cyanuric chloride, triphenylphosphine oxide and anhydrous tetrahydrofuran, adding imidazole bromide to react to form an intermediate, then adding ethylene glycol to continuously react, and performing vacuum drying and grinding to obtain the phosphorus heterocycle covalent organic framework. According to the diaphragm, the interface adhesion and electrolyte wettability are enhanced synergistically through the bifunctional compound, and the thermal stability and the cycle performance are improved.

A phase change material composition for latent heat storage is provided. The composition includes a eutectic mixture of two or more salt hydrates, and at least one salt additive each selected from a bromide salt and a bromide salt hydrate. The mixture of salt hydrates has a melting temperature above room temperature. The at least one salt additive decreases the melting temperature of the mixture and reduces a degree of supercooling of the mixture. The mixture of salt hydrates may be a mixture of calcium chloride hexahydrate and magnesium chloride hexahydrate. The salt additives may include both calcium bromide and magnesium bromide. The melting temperature of the phase change material composition may be in a range of approximately 15 to 25° C. A thermal energy storage system including the phase change material composition and a method of heat management in the thermal energy storage system are also provided.

The invention provides an eugenol quaternary ammonium salt compound as well as a preparation method and application thereof in wood preservation, and relates to the technical field of organic chemistry. Eugenol is adopted as a core framework, carbon chains and alkyl tertiary amine are adopted for bridging, bromine salt is formed, the growth of wood decay fungi can be obviously inhibited, meanwhile, eugenol serving as a natural product can avoid threat to the ecological environment, and the safety and high efficiency in the wood preservation process are improved.

The present invention comprises: a temperature information acquisition unit (120) that acquires first temperature information indicating the temperature of water being treated that is supplied to a reaction tank (180) in which urea in water being treated is treated; a temperature information acquisition unit (130) that acquires second temperature information indicating the temperature of the water being treated that is within the reaction tank (180) or is discharged from the reaction tank (180); and an addition amount adjustment unit (150) that, on the basis of the result of comparing the temperature indicated by the first temperature information and the temperature indicated by the second temperature information, adjusts at least one of the amount of bromide salt added to the water being treated and the amount of hypochlorite added to the water being treated.

The invention belongs to the field of post-treatment of organic chemical synthesis methods, and relates to a post-treatment method for propiconazole synthesis. A crude propiconazole product is used as a raw material and is subjected to an isomerization reaction under the combined action of a bromine-containing ionic liquid and sodium alkoxide to generate cis-propiconazole. The bromine-containing ionic liquid is imidazolium bromine salt: [CnH2n + 1-MIM] + Br <-> (n = 2-4) or pyridinium bromine salt: [CmH2m + 1-Py] + Br <-> (m = 2-4). The method is mild in process condition, low in reaction temperature, short in process path, simple to operate and high in safety, efficient conversion of low-efficiency trans-propiconazole and ineffective isomers is achieved, the content of cis-propiconazole in a treated sample is as high as 99%, the yield is as high as 97%, the economical efficiency of the process is improved, and the method is suitable for industrial production. And the ionic liquid used in the reaction can be further recycled, so that the atom utilization rate is increased.

The invention relates to a CsPbBr3 inorganic perovskite composite material and a preparation method thereof. The preparation method comprises the following steps: S1, mixing thiocyanate, inorganic lead salt, inorganic cesium salt and a first carrier for reaction to obtain a first mixture; s2, carrying out mixing reaction on inorganic bromine salt and a second carrier to obtain a second mixture; s3, mixing and reacting the first mixture and the second mixture to obtain a head product; and S4, performing high-temperature calcination on the initial product to obtain the CsPbBr3 inorganic perovskite composite material. Compared with the prior art, the method has the advantages that the thiocyanate is introduced in the preparation process, the thiocyanate can be originally converted into lead sulfate to form a protective layer on the surface of CsPbBr3 during high-temperature calcination, the product has good stability, and the method has the advantages of being simple in preparation process and suitable for large-scale production.

The invention discloses a method for preparing 2, 5-diformyl furan from cellulose by a one-step method, which is characterized by comprising the following steps of: dissolving cellulose serving as a raw material, bromine salt or aluminum salt serving as a main active ingredient of a catalyst, oxygen and DMSO (dimethyl sulfoxide) serving as oxidants and a solvent system consisting of DMSO / TEAC (tetraethylammonium chloride), and reacting at normal pressure to obtain 2, 5-diformyl furan. The preparation method comprises the following steps of: reacting bromine salt or aluminum salt for a certain time at the temperature of between 80 and 180 DEG C, and converting cellulose into 2, 5-diformyl furan through cascade reaction by adopting a one-step method, and the bromine salt or the aluminum salt is one of aluminum bromide, iron bromide, copper bromide, aluminum chloride, aluminum nitrate nonahydrate and the like; the dosage of the bromine salt or the aluminum salt is 0.01 to 0.50 mmol; according to the present invention, the solvent system composed of dimethyl sulfoxide (DMSO) / tetraethylammonium chloride (TEAC) is adopted, the used catalyst is cheap and easily available, the reaction is performed at 140 DEG C for 20 h, the yield of the 2, 5-diformyl furan can achieve 66.3%, the reaction condition is mild, the requirement on the equipment is low, and the method is suitable for industrial production.

This invention provides an N,N-diethylpyrrolidine difluorosulfonylimide salt, its preparation method, and its applications, belonging to the field of ionic liquid materials technology. The preparation method of the N,N-diethylpyrrolidine difluorosulfonylimide salt of this invention includes the following steps: reacting potassium carbonate solution, tetrahydropyrrole, and bromoethane in an inert atmosphere; then dissolving the reaction product in an organic solvent, filtering, and evaporating to obtain N,N-diethylpyrrolidine bromide; dissolving the N,N-diethylpyrrolidine bromide in water, adding activated carbon for decolorization treatment, to obtain an aqueous solution of N,N-diethylpyrrolidine bromide; and subjecting the aqueous solution of N,N-diethylpyrrolidine bromide to an ion exchange reaction with lithium difluorosulfonylimide in an organic solvent to obtain the final product. The preparation method of this invention separates the reaction product and byproduct into liquid and solid phases, and the reaction does not introduce other impurity ions, greatly improving the purity of the product.

The invention discloses a corrosion-resistant polyion liquid coating and a preparation method thereof. According to the invention, ionic liquid monomer 3-ethyl-1-vinyl imidazole bromine salt is adopted to prepare polyionic liquid (PIL) through a free radical polymerization method, then the polyionic liquid is coated on a Cu (at) Cu (OH) 2 filter material with a super-hydrophilic Cu (OH) 2 nanoneedle coated copper mesh, the polyionic liquid is used as a protective coating of Cu (OH) 2, and the Cu (at) Cu (OH) 2 filter material can be used for filtering and purifying the Cu (OH) 2 nano-needle coated Cu (at) Cu (OH) 2 nano-needle coated Cu (at) Cu (OH) 2 nano-needle coated copper mesh. The prepared Cu-coated Cu (OH) 2-PIL filter material not only has an oil-water separation capacity in a wastewater environment, but also has a certain capacity of separating organic solvents with different polarities, Cu-coated Cu (OH) 2 and Cu-coated Cu (OH) 2-PIL as well as Cu-coated Cu (OH) 2 and Cu-coated Cu (OH) 2-PIL soaked in acid, alkali and salt solutions are analyzed by adopting methods such as XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), XPS (X-Ray Photoelectron Spectroscopy) and the like, and a result shows that a copper hydroxide layer structure on the surface of Cu-coated Cu (OH) 2 soaked in NaOH and NaCl severely collapses; after the PIL coated Cu coated Cu (OH) 2-PIL is soaked in NaOH and NaCl, Cu (OH) 2 on the surface of the PIL coated Cu coated Cu (OH) 2-PIL completely reacts with the HCl and loses separation capacity, however, the PIL coated Cu coated Cu (OH) 2-PIL still retains a complete nano copper hydroxide layer after being soaked in NaOH and NaCl, and part of Cu (OH) 2 is retained after being soaked in the HCl.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

The invention relates to an imidazole bromide azobenzene ionic liquid catalyst as well as a synthesis method and application thereof. According to the technical scheme, the preparation method comprises the following steps: diazotizing 2, 6-diethylaniline at 0-5 DEG C, and then carrying out coupled reaction on the diazotized 2, 6-diethylaniline and 3, 5-dimethyl sodium phenolate to obtain 4-hydroxy-2, 6-dimethyl-2 ', 6'-diethylazobenzene; the preparation method comprises the following steps: carrying out a nucleophilic substitution reaction on 4-bromoethoxy-2, 6-dimethyl-2 ', 6'-diethylazobenzene and 1, 2-dibromoethane to obtain an intermediate 4-bromoethoxy-2, 6-dimethyl-2 ', 6'-diethylazobenzene; and finally, reacting the intermediate with excessive N-methylimidazole to synthesize the imidazole bromide azobenzene ionic liquid catalyst, namely 4-(N-methylimidazole bromide)-ethoxy-2, 6-dimethyl-2 ', 6'-diethyl azobenzene. The method has the characteristics of simple synthesis method, good water solubility of the catalyst, short reaction time at room temperature, high catalytic efficiency, green and environment-friendly catalytic reaction with water as a solvent, easy separation of products, recyclability of the catalyst and the like.

The invention relates to the technical field of catalysts, and discloses a ZSM-5 type structure-containing all-silicon molecular sieve catalyst and a preparation method thereof, and a cyclohexanone-oxime gas phase Beckmann rearrangement reaction method, the method comprises the following steps: (1) mixing a silicon source, KOH, an organic alkali and water, and hydrolyzing to obtain a colloid mixture; (2) crystallizing the colloid mixture, and optionally concentrating the obtained crystallization mother liquor to obtain molecular sieve slurry; (3) mixing the molecular sieve slurry with a binder, and pulping to obtain molecular sieve-binder slurry; carrying out spray molding on the molecular sieve-binder slurry, and then roasting; and (4) contacting the product obtained by roasting in the step (3) with an alkaline buffer solution containing ammonium salt, ammonia water, magnesium salt and bromine salt, and then drying. The microsphere type all-silicon-1 molecular sieve catalyst prepared by the method has relatively high cyclohexanone-oxime conversion rate and caprolactam selectivity.

The invention belongs to the technical field of electrochemical energy storage, and relates to an ionic liquid complexing additive as well as a preparation method and application thereof. The method comprises the following steps: dissolving 1-methylimidazole and 2-bromoethanol in anhydrous toluene to obtain a mixed solution; under the protection of nitrogen, carrying out reflux reaction on the mixed solution; after the reflux reaction is completed, removing the solvent through evaporation to obtain a solid product; and washing and drying the solid product to obtain the 1-(2-ethoxyl)-3-methylimidazole bromine salt. The complexing additive disclosed by the invention has excellent complexing performance, and the ionic liquid formed by complexing the complexing additive and the bromine elementary substance can be kept in a liquid state under a low-temperature condition, so that long-term stable operation of the battery is ensured.

Adding acid to a solution containing bleach and soluble bromide salt accelerates the reaction producing sodium hypobromite which has a pronounced yellow color. The amount of acid needed to provide complete reaction can be controlled by measuring light absorbed by the solution. Add acid until Absorbance stops increasing, indicating complete conversion of NaBr to NaOBr. The amount of acid added can also be controlled by measuring pH before and after adding NaBr to diluted bleach. When enough acid has been added to fully neutralize sodium hydroxide in the bleach and provide nearly 100% conversion, the difference between the two pH values becomes positive and continuous to increase, whereby acid feed can be controlled to make pH change equal to or greater than a predetermined positive value.

The application belongs to the technical field of organic synthesis, and particularly relates to a benzimidazole alkyl bromide salt-anemarrhena saponin aglycone derivative, a preparation method and application thereof. The benzimidazole alkyl bromide salt-anemarrhena saponin aglycone derivative provided by the application has a structure shown in formula 1 or formula 2. The application combines an anemarrhena saponin aglycone skeleton and a benzimidazole skeleton, and the obtained benzimidazole alkyl bromide salt-anemarrhena saponin aglycone derivative with the structure shown in formula 1 or formula 2 has significant antitumor activity. The antitumor growth inhibition activity of the benzimidazole alkyl bromide salt-anemarrhena saponin aglycone derivative provided by the application is better than that of cisplatin (DDP), an anticancer drug.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

This invention relates to the field of catalyst technology, and discloses a method for preparing a microsphere molecular sieve catalyst and a method for the gas-phase Beckmann rearrangement reaction of cyclohexanone oxime, comprising: (1) carbonizing a waste cyclohexanone oxime gas-phase Beckmann rearrangement catalyst; (2) mixing the obtained product with water and slurrying it until the particle diameter in the slurry is less than 20 μm; (3) mixing the slurry, KOH, an organic template agent, and an alcohol; (4) crystallizing the colloidal mixture, and optionally concentrating the crystallization mother liquor to obtain a molecular sieve slurry; (5) mixing the molecular sieve slurry with a binder and slurrying it, spray-forming the molecular sieve-binder slurry, and then calcining it; (6) contacting the product obtained from calcination in step (5) with an alkaline buffer solution containing ammonium salt, ammonia, magnesium salt, and bromide salt, and then drying it. The catalyst obtained by this preparation method has a high cyclohexanone oxime conversion rate and caprolactam selectivity in a fluidized bed reaction system.

The present invention belongs to the field of electrochemical analysis and specifically relates to the preparation and application of a PILs / PPy / GO modified glassy carbon electrode. 1-(10-(4-methylthiophene-3-oxy)decyl)-3-vinyl imidazole bromide is reacted with PPy / GO-(CH2)4Br nanosheets in DMF to prepare PILs / PPy / GO nanosheets; the PILs / PPy / GO nanosheets are dispersed in an organic solvent to prepare a composite modifier; and the composite modifier is drop-coated on the surface of the glassy carbon electrode to obtain a PILs / PPy / GO modified glassy carbon electrode. The PILs / PPy / GO modified glassy carbon electrode prepared by the present invention exhibits strong sulfophilic properties due to the presence of sulfur-containing groups in the PILs. This allows the PILs / PPy / GO nanosheets to enrich polysulfides in the solution on the surface of the working electrode, optimizes the electron transport process of the electrocatalytic oxidation of polysulfides, and enables the detection of polysulfides under conditions close to those used in actual batteries.

The present invention discloses a corrosion-resistant polyionic liquid coating and a preparation method thereof. In the present invention, the ionic liquid monomer 3-ethyl-1-vinylimidazolium bromide is used to prepare polyionic liquid (PIL) by free radical polymerization, and then it is coated on the Cu@Cu(OH)2 filter material with superhydrophilic Cu(OH)2 nanoneedles coated copper mesh. Using the polyionic liquid as a protective coating for Cu(OH)2, the prepared Cu@Cu(OH)2-PIL filter material not only has the ability of oil-water separation in wastewater environment, but also has the ability to separate organic solvents with different polarities to a certain extent. XRD, SEM, XPS and other methods are used to analyze Cu@Cu(OH)2 and Cu@Cu(OH)2-PIL, as well as Cu@Cu(OH)2 and Cu@Cu(OH)2-PIL after being soaked in acid, alkali and salt solutions. It is found that the structure of the copper hydroxide layer on the surface of Cu@Cu(OH)2 collapses seriously after being soaked in NaOH and NaCl; after being soaked in HCl, the surface Cu(OH)2 completely reacts with HCl and loses the separation ability. However, the Cu@Cu(OH)2-PIL coated with PIL still retains a complete nano-copper hydroxide layer after being soaked in NaOH and NaCl, and still retains part of Cu(OH)2 after being soaked in HCl.

The present invention belongs to the technical field of dust suppressants, and specifically discloses a preparation method and application of a magnesium powder dust suppressant with high agglomeration and flame retardancy, including the following components: 1-ethyl-3-methylimidazolium ethyl sulfate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, N-butyl imidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium trifluoromethanesulfonate, 1-butyl-3-methylimidazolium bromide, plant glycosides, sodium sulfate, magnesium chloride, and the remainder is water; the weight percentage of the water to all the above components is 60-80%. The present invention adopts the preparation method and application of the above-mentioned magnesium powder dust suppressant with high agglomeration and flame retardancy, solves the problem that a single-component metal magnesium dust suppressant in the prior art cannot meet the current metal magnesium production dust prevention demand, and has effective explosion suppression capability to ensure the safety of the staff and the factory during the metal magnesium processing.

The invention discloses a synthesis method of 9-bromoanthracene, and belongs to the technical field of organic synthesis. According to the method, anthracene is used as a raw material, inorganic bromine salt is used as a bromine source, hydrogen peroxide is used as an oxidizing agent, and 9-bromoanthracene is synthesized in a mixed solvent in a high-selectivity manner under the catalysis of composite Lewis acid; and purifying the crude product through stepped step-by-step recrystallization to obtain a high-purity product. Through the synergistic effect of the composite catalytic system and the mixed solvent, generation of a 9, 10-dibromoanthracene byproduct difficult to remove is inhibited from the source, and efficient separation of the product and key impurities can be realized without column chromatography in combination with a gradient cooling fractional crystallization process. The method is green and safe in process, simple to operate, low in cost and easy to industrialize, and the prepared 9-bromoanthracene can meet the application requirements of OLED photoelectric materials and other high-end fields.

The application discloses a kind of polyether sulfone microspheres, preparation method and application, comprising the following steps: step 1: vinyl imidazole bromide salt, acrylic acid and azobisdimethylvaleronitrile are dissolved in solvent, stirring is carried out under nitrogen protection condition, fully reacts, precipitates, and is filtered to obtain polymer;Step 2: the polymer obtained in step 1 is dissolved in solvent to obtain polymer solution;Step 3: the polymer solution obtained in step 2 and polyether sulfone solution are blended, and polyether sulfone microspheres are obtained by electrospinning;The polyether sulfone microspheres obtained by the application have a diameter of 500-800 μm, have a loose porous structure, have a large specific surface area, and have good bilirubin adsorption effect.

The application discloses an alumina-coated diaphragm in the field of lithium ion batteries and a preparation method thereof. The diaphragm comprises alumina particles, a fluorine-containing porous organosilicon compound, a phosphorus-heterocyclic covalent organic framework, a binder, a dispersing agent and deionized water. The fluorine-containing porous organosilicon compound is formed by mixing methyltrimethoxysilane and perfluorohexyltrimethoxysilane with water, reacting to form a sol-gel system after adjusting pH with ammonia water, continuously reacting by adding aminosilane, and then performing rotary evaporation, calcination and grinding; the phosphorus-heterocyclic covalent organic framework is formed by dissolving cyanuric chloride and triphenylphosphine oxide in anhydrous tetrahydrofuran, reacting to form an intermediate by adding imidazole bromide, continuously reacting by adding ethylene glycol, and then performing vacuum drying and grinding. The diaphragm synergistically enhances the interface adhesion and electrolyte wettability through the bifunctional compound, and improves the thermal stability and cycle performance.

The application discloses a ternary eutectic solvent, a hybrid self-lubricating material, a polymer self-lubricating composite material and a preparation method thereof. The raw materials of the ternary eutectic solvent include choline chloride, oxalic acid dihydrate and 1-hexadecyl-3-methyl imidazole bromide; wherein the amount of choline chloride is 25-30 parts, the amount of oxalic acid dihydrate is 35-40 parts, and the amount of 1-hexadecyl-3-methyl imidazole bromide is 0.5-1.0 parts in terms of the weight fraction ratio. The application initiatively synchronously pretreats lignocellulose and two-dimensional materials by using ternary DES (choline chloride / oxalic acid dihydrate / ionic liquid crystal), solves the core problems of poor dispersibility of lignocellulose and agglomeration of two-dimensional materials from the source by using the interfacial activity of ionic liquid and the deconstruction ability of DES, and realizes efficient activation of biomass raw materials.

The invention relates to a preparation method and application of an ionic liquid electrolyte for electrocatalytic reduction of carbon dioxide. The electrolyte is composed of an ionic liquid and an inorganic salt solution, the ionic liquid is one or more of 1-butyl-3-methylimidazolium bromide, 1-butyl-3-methylimidazolium hexafluorophosphate, tetrabutyl ammonium tetrafluoroborate and tetrabutyl ammonium hexafluorophosphate, and the inorganic salt solution is a potassium bicarbonate solution. The ionic liquid electrolyte can optimize the contact between a catalyst interface and the electrolyte, realizes good ion transmission, enhances the conductivity of the system, enhances the activation of CO2, and promotes the electrochemical reduction reaction of CO2. According to the electrolyte disclosed by the invention, in a relatively wide voltage range, CO2 is subjected to electrochemical reduction under the action of a catalyst to obtain an HCOOH product.

The application belongs to the technical field of photocatalysts, and particularly relates to a Z-type heterojunction photocatalyst and a preparation method and application thereof. The preparation method provided by the application comprises the following steps: mixing Na2MoO4.2H2O, Bi(NO3)3.5H2O, Bi(NO3)3.5H2O, BSB-Vs and water to perform a second hydrothermal reaction to obtain BSB-Vs@BMO. 19 S 27 Br3 and water to perform a first hydrothermal reaction to obtain the BSB@BMO, or mixing thiourea, 1-hexadecyl-3-methyl imidazole bromide, Bi(NO3)3.5H2O, polyvinylpyrrolidone and ethylene glycol to perform a solvothermal reaction to obtain BSB-Vs; mixing Na2MoO4.2H2O, Bi(NO3)3.5H2O, BSB-Vs and water to perform a second hydrothermal reaction to obtain BSB-Vs@BMO. The Z-type heterojunction semiconductor material provided by the application has a low photogenerated carrier recombination rate and excellent photocatalytic performance.

Reaction of bleach with a soluble bromide salt to produce brightly colored hypobromite ion enables easy colorimetric measurement of active chlorine, or NaOCl content of bleach. Water of dilution and a suitable buffer are combined with bleach to provide a stable color over a wide range of bleach composition. This analytical method is well suited for use outside the laboratory at sites where bleach is stored or used; for example, but not limited to industrial sites that use bleach, places where bleach is used to destroy microbes and / or hazardous substances in water, and commercial laundries. In addition to analyzing bleach itself, process water streams containing some amount of bleach or another source of active chlorine can be analyzed over a wide range of NaOCl concentration.

The invention discloses a spinning solution, a preparation method of regenerated cellulose fiber, a compound, and a preparation method and application of the compound. The preparation method comprises the following steps: mixing cellulose, an N-methylmorpholine-N-oxide aqueous solution, dimethyl sulfoxide and morpholine bromine salt to obtain a spinning solution; according to the method, the viscosity of the spinning solution can be reduced, and the breaking strength of the regenerated cellulose fiber can be improved.