8 results about "2,4,6-Tribromophenol" patented technology

The invention discloses an application of an electronic waste pollution human body exposure fingerprint spectrum in exposure risk prediction, and the human body exposure fingerprint spectrum is composed of more than three of exposure markers of 2, 4, 6-tribromophenol, 2, 4, 5-trichlorophenol, 4-bromophenol, 1-hydroxypyrene and bisphenol A. The invention further discloses an application of the electronic waste pollution human body exposure fingerprint spectrum in exposure risk prediction. According to the method, a systematic method of urine pollutant exposure omics is adopted for the first time, comprehensive screening and characterization of pollutant exposure markers related to specific components and by-products are achieved in electronic waste exposure worker groups, and the method is the most systematic organic pollutant exposure research known in the field at present.

The invention relates to the technical field of fine chemical engineering and flame retardant preparation, and discloses a preparation method of bromo-triazine capable of improving thermal stability, and the preparation method comprises the following steps: mixing phenol, water and dichloromethane, controlling the temperature, and carrying out oxidative bromination reaction to prepare an organic phase containing tribromophenol; then, under the action of an organic amine catalyst, carrying out condensation reaction on the organic phase, liquid caustic soda and cyanuric chloride; after the reaction, washing with water to remove impurities; and in the presence of process water, firstly controlling the temperature at 38-42 DEG C for azeotropic desolvation, then raising the temperature to 85-95 DEG C for high-temperature crystallization and crystal growing, and finally cooling, filtering and drying to obtain the bromo-triazine product. By utilizing the high selectivity of the organic amine catalyst and a two-stage azeotropic crystallization process, the side reaction is effectively reduced, the solvent wrapped in the crystal is eliminated, the prepared product is high in main content and extremely low in volatile component, the temperature can reach 370 DEG C or above when the thermal weight loss is 2%, and the thermal stability is remarkably improved.

This invention discloses the application of human exposure fingerprinting of electronic waste pollution in exposure risk prediction. The human exposure fingerprinting consists of three or more of the following exposure markers: 2,4,6-tribromophenol, 2,4,5-trichlorophenol, 4-bromophenol, 1-hydroxypyrene, and bisphenol A. This invention is the first to employ the systematic method of urinary contaminant exposure profiling to achieve comprehensive screening and characterization of contaminant exposure markers related to specific components and byproducts in workers exposed to electronic waste. This is currently the most systematic organic contaminant exposure study known in this field.

The invention relates to the technical field of flame retardant preparation, in particular to a method for improving the quality of a bromo-triazine product based on a high-shear homogenization technology. According to the method, after a synthetic reaction of tribromophenol and a bromo-triazine product is completed, high-shear homogenization treatment is carried out on an organic solution of the tribromophenol and the bromo-triazine product, and the treatment can effectively crush coarse crystals and aggregates, so that wrapped impurities are exposed and further efficiently removed in the subsequent washing process. According to the method provided by the invention, the particle size of the product can be obviously optimized, the purity of the product is improved, and the dispersing performance of the product in a high polymer material is improved, so that a flame-retardant product with excellent performance is obtained. The method provided by the invention is simple and convenient in process, can fundamentally solve the problem of the quality pain point of the bromo-triazine product by introducing a simple and efficient high-shear homogenization treatment process, is convenient for industrial production, and has remarkable industrial application value and economic benefit.

The application discloses a method for continuously preparing tris(tribromophenoxy) triazine, relates to the technical field of organic chemical synthesis, and is characterized in that 2,4,6-tribromophenol, cyanuric chloride and sodium hydroxide are used as raw materials, a complex organic solvent system is constructed, mixed solution A and mixed solution B are prepared respectively, and the two solutions and a sodium hydroxide solution are continuously fed into a multi-stage series reactor to react; the obtained crude product after the reaction is sequentially subjected to alkali washing, acid washing, water washing and a micro-washing system, and then subjected to a continuous solvent recovery and pressure filtration step, so that a high-purity tris(tribromophenoxy) triazine product is finally obtained. The method realizes full-liquid continuous feeding through the complex solvent, improves feeding stability and reaction control precision, strengthens reaction conversion efficiency and inhibits byproduct generation through the multi-stage liquid-liquid heterogeneous reaction system, improves washing efficiency and impurity control ability through the micro-washing system, and significantly improves product purity, yield and thermal stability, so that the method has a good industrial application prospect.

The invention relates to the field of flame-retardant products, and particularly discloses a preparation method of bromotriazine capable of improving reaction selectivity. Comprising the following specific steps: adding phenol, water and dichloromethane into a reaction container, dropwise adding hydrogen peroxide into a reaction system for reaction, dropwise adding bromine into the reaction system for mixed reaction to obtain a reaction solution, treating the reaction solution with sodium sulfite, washing with water, and separating to obtain an organic phase containing tribromophenol, the method comprises the following steps: mixing an organic phase containing tribromophenol with magnesium oxide, a catalyst and cyanuric chloride for reaction to obtain a crude product solution, washing the crude product solution, mixing the washed crude product solution with process water, heating for azeotropic desolvation, and finally crystallizing and drying to obtain bromotriazine; the catalyst is a multi-walled carbon nanotube loaded amine compound; according to the present invention, the amine compound is loaded by using the tubular structure of the multi-walled carbon nanotube, such that the reaction rate of the main reaction can be improved through the multiple effects, the side reaction can be inhibited, and the yield and the purity of the bromo-triazine product can be improved.

The application relates to the field of chemical substance preparation and purification, and particularly discloses a highly purified brominated triazine and a preparation method thereof. The preparation method of the highly purified brominated triazine comprises the following steps: (1) a bromination reaction: phenol, bromine and hydrogen peroxide are reacted in a mixed solvent of water and dichloromethane at 5-40 DEG C to obtain a bromination reaction liquid; (2) washing treatment: after the bromination reaction liquid is reacted with a sodium sulfite solution, washing is performed to obtain tribromophenol; (3) a condensation reaction: tribromophenol, liquid alkali, a recyclable catalyst and cyanuric chloride are subjected to a condensation reaction in a synthesis kettle; (4) crystallization and post-treatment: process water is added into the condensation reaction liquid in an amount equal to that of the condensation reaction liquid, crystallization is performed, and the final product is obtained through filtration and drying; in addition, the preparation method has the advantages of improving the product purity of a brominated triazine synthesis process.

The application belongs to the technical field of organic chemical synthesis, and specifically provides a preparation method of tri(trisbromophenoxy) triazine, which comprises the following steps: S1, a bromination reaction is performed to obtain 2,4,6-trisbromophenol, and a phase transfer catalyst is prepared in situ after purification of a by-product aqueous phase containing sodium bromide generated in the reaction; S2, mixed preparation solutions A and B are prepared; S3, the mixed solution is reacted with a sodium hydroxide solution to obtain a crude product solution; S4, the crude product solution is subjected to alkaline washing, acid washing and water washing, and an organic phase of a washing product is obtained after phase separation; S5, waste water after water washing and a back-extraction solvent are back-extracted to obtain an organic phase; S6, waste liquid after alkaline washing and acid washing is collected, and is regenerated into inorganic alkali aqueous solution and inorganic acid aqueous solution for reuse in alkaline washing and acid washing; and S7, the organic phase of the washing product in step S4 and the organic phase back-extracted in step S5 are combined, and tri(trisbromophenoxy) triazine is obtained through continuous solvent recovery and continuous pressure filtration.