13 results about "Bromine Compounds" patented technology

The present application relates to a method for liquid phase oxidation of durene, which comprises: a first stage, in the presence of a catalyst, with acetic acid as a solvent, a liquid phase oxidation reaction of an oxidant source and durene to produce an intermediate mixture, the catalyst containing Co salt, Mn salt, Zr salt and bromide compound; a second stage, adding a mixture of bromide and pure water to the intermediate mixture, and continuing the oxidation reaction with the oxidant source to produce pyromellitic acid; wherein the concentration of oxidant in the oxidant source of the first stage is lower than the concentration of oxidant in the oxidant source of the second stage. By controlling the concentration of oxidant in the oxidant source of the first stage to be lower than the concentration of oxidant in the oxidant source of the second stage in the liquid phase oxidation process of durene, the yield of pyromellitic acid and the purity of crude pyromellitic acid are significantly improved.

The application belongs to the field of organic photovoltaics, and relates to a kind of polymer photovoltaic material and its preparation method and application. Double bromide compound A and double side tin compound B are subjected to Stille cross coupling reaction under the action of palladium catalyst, and the polymer photovoltaic material is obtained. The polymer photovoltaic material prepared by the application has an ultra-wide absorption spectrum range from 300 nm to 1200 nm. Such material exhibits an ultra-wide spectral range and a high extinction coefficient, and embodies excellent light absorption capacity. The strong light absorption capacity of the polymer photovoltaic material prepared by the application will help to improve the device efficiency of organic photovoltaics and improve the energy conversion efficiency of the device. The polymer photovoltaic material prepared by the application provides reference value for the design of functional materials in many fields of organic photoelectricity and solar energy utilization and conversion.

The embodiment provides a reliable method for analyzing bromine compounds. [Solution] The method for analyzing bromine compounds according to the embodiment includes the steps of: measuring the bromine concentration in a sample by X-ray fluorescence analysis; measuring the bromine concentration in a sample by mass spectrometry; and evaluating the difference between the bromine concentration in the sample measured by X-ray fluorescence analysis and the bromine concentration in the sample measured by mass spectrometry.

To provide a method for producing aryldiadamantylphosphine derivatives, obtained by introducing a diadamantylphosphine group (-P(Ad)2) into a compound having an aryl skeleton, in a highly industrially advantageous manner and in high yield, without the use of a palladium catalyst. [Solution] A method for producing an aryldiadamantylphosphine derivative, comprising: a lithiation step of reacting a bromo compound with alkyllithium to obtain a lithide; and a reaction crystallization step of reacting the obtained lithide with diadamantylchlorophosphine in a solvent to produce and precipitate an aryldiadamantylphosphine derivative.

This invention discloses a high color rendering index (Ra) and long lifespan magnetic ring-coupled plasma light source and its preparation method. The light source is an electrodeless source, comprising a bulb shell, an inorganic ceramic protective layer, a luminescent filler encapsulated inside the bulb shell, a mixed buffer gas, and a magnetic ring coupler fitted outside the bulb shell. The luminescent filler contains sulfur (S), selenium (Se), rare earth triiodine compounds, alkali metal bromine compounds, and alkali metal iodine compounds. The mixed buffer gas is a mixture of argon (Ar) and krypton (Kr) or argon (Ar) and xenon (Xe). The preparation method includes five steps: bulb shell pretreatment, inorganic ceramic protective layer preparation, luminescent filler filling, vacuuming and gas filling, and fusion sealing. This invention achieves ultra-high color rendering indexes (Ra>95, R9>90) by optimizing the luminescent formula and structural design. It contains no toxic substances and meets environmental standards, solving the technical pain points of poor color rendering, short lifespan, and insufficient environmental friendliness of traditional plasma light sources.

The invention relates to the technical field of organic synthesis, in particular to chiral alpha-amino acid and a preparation method thereof, and a synthesis method of a spanishneedles cyclic peptide natural product. N-(diphenylmethylene) glycine tert-butyl ester is used as a substrate, alkyl halide is used as a coupling reagent, copper salt is used as a catalyst, tBuFOXAP is used as a ligand, asymmetric coupling is completed under an alkali and solvent system, high enantioselectivity conversion of unactivated primary / secondary alkyl halide and alpha-carbonyl bromide compounds is achieved, and a series of chiral non-natural alpha-amino acids are prepared. Besides, through a 4 + 3 linear synthesis strategy, the chiral alpha-amino acid 3w is taken as a key raw material, and the total synthesis of the spanishneedles cyclic peptide natural product is completed for the first time through multi-step reaction, so that the substrate range of the chiral alpha-amino acid is expanded, and a new path is provided for synthesis of the cyclic peptide natural product.

This invention belongs to the field of building materials, specifically relating to a preservative for polycarboxylate superplasticizers containing an isothiazolinone composition and its preparation method. The invention comprises, by weight, the following raw materials: 1-15 parts of preservative monomer, 0.5-2.0 parts of bactericidal monomer, 1-2 parts of stabilizer, and 50-90 parts of water. The bactericidal monomer is an isothiazolinone composition, including isothiazolinone derivatives and isothiazolinone quaternary ammonium salts; the preservative monomer is an organic bromine compound. This invention, using organic bromine compounds and isothiazolinone derivatives, provides a preservative for polycarboxylate superplasticizers that exhibits excellent antibacterial properties and tolerance, and can be widely applied in various fields.

This invention relates to a composite modification method for coating lithium phosphorus, sulfide, and bromine compounds with nano-oxides, and pertains to the field of solid-state electrolyte technology. The method involves drying lithium phosphorus, sulfide, and bromine powder, adding a dispersant, and performing graded ball milling to obtain a lithium phosphorus, sulfide, and bromine substrate powder. Nano-alumina powder is dispersed in anhydrous ethanol, and oleic acid and polyvinylidene fluoride are added to obtain a nano-oxide coating solution. The lithium phosphorus, sulfide, and bromine substrate powder is slowly added to the coating solution to perform an in-situ coating reaction, forming a coating precursor. The coating precursor is then vacuum dried and subjected to low-temperature crystallization to obtain a primary composite modified material. The primary composite modified material is then subjected to secondary ball milling and sieving to obtain a nano-oxide-coated lithium phosphorus, sulfide, and bromine compound composite modified material. This invention can significantly improve the room temperature ionic conductivity, water and oxygen stability, and battery cycle performance of the material.

This invention provides a catalyst for the liquid-phase oxidation of terephthalic acid and its application. The catalyst comprises a cobalt salt, a zirconium salt, a bromine-containing compound, and an auxiliary agent; the mass ratio of Co, Zr, Br, and the auxiliary agent in the catalyst is 500:(250–350):(500–1200):(30–80); the auxiliary agent is selected from compounds with the structure shown in formula (1), wherein R is selected from C1–C4 alkyl groups. The catalyst for the liquid-phase oxidation of terephthalic acid provided by this invention has a low Br content and good catalytic performance; its application in the liquid-phase oxidation of p-xylene to terephthalic acid can reduce the impurity content in the product and effectively improve the product yield.

This invention belongs to the field of membrane material technology and discloses a high-flux, acid-resistant polyquaternary ammonium nanofiltration membrane and its preparation method. The method includes: (1) coating an aqueous solution containing cyclic tertiary nitrogen oligomers onto a porous support substrate membrane, wetting it, and then removing excess liquid; (2) subsequently coating the surface of the material obtained in step (1) with a hexane solution containing benzyl bromide, wetting it so that the tertiary nitrogen atoms on the cyclic tertiary nitrogen oligomers undergo a quaternization reaction with the benzyl bromide, gradually forming a dense separation membrane at the water-hexane interface; after the reaction is completed, it is dried to obtain the nanofiltration membrane. The nanofiltration membrane prepared by this invention overcomes the disadvantages of traditional polyquaternary ammonium membranes, which require several hours to prepare and have low permeability. A defect-free nanofiltration separation membrane can be prepared in just 1 minute. After soaking in 1M sulfuric acid for 30 days, it can still maintain high permeability and rejection rate, showing good application prospects.

The application discloses an amine bromine two-electron flow battery electrolyte and application and a flow battery, and belongs to the flow battery field. The amino compound with an electron-withdrawing group at the ortho position is used in the electrolyte, and reacts with the bromine charged to the positive valence to form an amine bromine compound, thereby stabilizing the positive valence bromine, and realizing the reversible two-electron transfer reaction of the bromine ion to the amino compound. The amine compound has different solubilities and generates different voltages according to the difference of the substituents, and thus has wide adjustability and applicability, and can be used in an acidic, neutral and weak alkaline flow battery system. The flow battery assembled by using the electrolyte prepared by the reaction has the advantages of low cost and high energy density, and can obtain a long cycle life and high battery efficiency.

The application discloses a kind of waste old containing bromine flame-retardant foamed polystyrene high-efficiency separation, harmless digestion and recovery method, innovatively using high-efficiency extraction technology, and the fat bromine flame retardant is separated with polystyrene material with high efficiency, and then respectively through polymer recovery granulation, strong base debromination under phase transfer catalysis and bromine extraction technology, realize polystyrene material and bromine resource complete recovery and recycling.The application can realize 100% complete recovery of polystyrene material and bromine resource, the removal rate of fat bromine compound is greater than 99.9%, and the whole recovery process does not produce harmful waste, with green sustainable development concept.

The invention discloses a preparation method of a siloxane-based fluorescent material for detecting trifluralin under sunlight, and particularly relates to the field of high polymer materials, vinyl siloxane and various brominated compounds are used as raw materials, and the siloxane-based fluorescent material is prepared based on a Heck reaction under the action of a catalyst; the siloxane-based material synthesized by the method disclosed by the invention has the fluorescence quantum yield up to 90%, and emits macroscopic blue-violet light under sunlight; according to the invention, trifluralin can be detected under sunlight, and the method has the characteristics of low detection limit, high sensitivity, good selectivity and rapid response.