Method for co-producing tetrabromobisphenol A sodium salt and tetrabromobisphenol A
A technology of tetrabromobisphenol and sodium salt, which is applied in the field of preparation of organic bromides, can solve the problems of heavy chlorobenzene odor, high solubility of tetrabromobisphenol A, incomplete recovery of chlorobenzene solvent, etc., and achieve the goal of eliminating volatilization loss Effect
Inactive Publication Date: 2012-01-11
HUAIHAI INST OF TECH
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Problems solved by technology
But tetrabromobisphenol A has high solubility in chlorobenzene, and in the hot water washing process, the reclaiming of chlorobenzene solvent is not thorough, and the mass percentage of doping in the tetrabromobisphenol A crude product of centrifugal dehydration drying is 8~12% Chlorobenzene solvent
As a result, the dispersion of chlorobenzene gas in the centrifugal drying area is large, and the smell of chlorobenzene is heavy, which affects the health of operators
The tetrabromobisphenol A crude product added with miscellaneous chlorobenzene solvent is sent to the drying workshop, and it is easy to cause the tetrabromobisphenol A crude product to melt and agglomerate in the airflow drying furnace, blocking the hot gas pipe of the airflow drying furnace and tetrabromobisphenol A powder funnel
According to the estimated annual production of 100,000 tons of tetrabromobisphenol A products in mainland China in 2007, 8,000 to 12,000 tons of chlorobenzene entered the atmosphere, polluting the space environment
Method used
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Embodiment Construction
[0017] Step 1: Tetrabromobisphenol A sodium salt aqueous solution preparation and chlorobenzene solvent separation process
[0018] at 3M 3 1000 kg of 16.2% caustic soda aqueous solution is pumped into the reactor. Open the stirring and cooling water valve of the reactor to maintain the material temperature in the reactor at 45-60°C. 1800 kg of tetrabromobisphenol A chlorobenzene solution with a mass percentage of 58% was continuously fed into the reactor within 1 hour from the washing and bromine removal section. Control the pH value of the material in the reaction kettle to be 9.0-9.5, keep the temperature at 60°C and stir for 1 hour, and keep the temperature at 60°C for 1 hour. Open the discharge valve at the bottom of the reaction kettle, and the lower layer of material in the reaction kettle is the tetrabromobisphenol A sodium salt solution that is released from the reaction kettle first. The upper layer material in the reactor is the chlorobenzene solvent which is dir...
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The invention provides a method for co-producing tetrabromobisphenol A sodium salt and tetrabromobisphenol A, which concretely includes steps of finishing bisphenol A bromination process and bromine-removing washing process to obtain tetrabromobisphenol A chlorobenzene solution, directly using sodium hydroxide aqueous solution with quality percent of 5%-25% to extract, dissolving tetrabromobisphenol A sodium salt into water phase to obtain tetrabromobisphenol A sodium salt water solution. By the simple method, the tetrabromobisphenol A and chlorobenzene solvent can be completely separated, and volatilization loss of chlorobenzene solvent at centrifugal work area and drying work area, atmosphere environment pollution and operator body harm are eliminated. The tetrabromobisphenol A sodium salt aqueous solution can be directly used for production of bromoepoxy resin or tetrabromobisphenol A bi(2,3-dibromopropyl)ether, can used in spray-drying process to produce tetrabromobisphenol A sodium salt, and can be acidified to produce tetrabromobisphenol A.
Description
technical field [0001] The invention relates to a method for preparing an organic bromide, in particular to a co-production method of tetrabromobisphenol A sodium salt and tetrabromobisphenol A. technical background [0002] Tetrabromobisphenol A white crystal, chemical formula C 15 h 12 o 2 Br 4 , molecular weight 543.88, melting point 180-184 ℃, soluble in ethanol and caustic soda aqueous solution, hardly soluble in water, can be recrystallized with 70-80% acetic acid aqueous solution. As a reactive flame retardant, tetrabromobisphenol A is mainly used in brominated epoxy resin, brominated polycarbonate, brominated phenolic resin, brominated unsaturated resin, etc. As an additive flame retardant, tetrabromobisphenol A is used synergistically with antimony trioxide, and is widely used in flame retardancy of engineering plastics such as ABS, HIPS, PP, PBT, etc. As a reaction intermediate, tetrabromobisphenol A is used in the synthesis of flame retardant tetrabromobisphe...
Claims
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IPC IPC(8): C07C39/367C07C39/44C07C37/62C07C37/66C08K5/136
Inventor 张田林夏井兵刘立文
Owner HUAIHAI INST OF TECH