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What are the preparation methods for sodium bromide?
 
Neutralization method: Use sodium bicarbonate as raw material: dissolve sodium bicarbonate in water, then neutralize with 35%-40% hydrobromic acid, and the reaction is obtained to obtain a sodium bromide solution, which is concentrated and cooled to precipitate sodium bromide dihydrate. Filtrate, dissolve the dihydrate with a small amount of water, and add bromine water dropwise until the color of the bromine just appears. Heat, decolorize with aqueous hydrogen sulfide solution and boil. Anhydrous crystals were precipitated at high temperature, and then dried and moved into a dryer, and kept at 110 for 1 hour. Then cool in a drying retention device equipped with calcium bromide desiccant to obtain anhydrous sodium bromide (reagent grade).   Using 40% liquid alkali as raw material: put hydrobromide into the reaction pot, slowly add 40% liquid alkali solution with constant stirring, neutralize to pH 7.5-8.0, and react to form a sodium bromide solution. Centrifuge the sodium bromide solution and filter it into a dilute sodium bromide solution storage tank. Then pour it into the evaporation tank to concentrate, and feed it 1-2 times in the middle. When the specific gravity is about 1.55°Be, centrifuge filter and filter it into the storage tank of concentrated sodium bromide liquid. Then press it into a crystallization tank, cool the crystals under stirring, and then centrifuge the crystals to obtain the finished product. The mother liquor returns to the dilute sodium bromide liquid storage tank.   Urea reduction method: In the alkaline-calcification tank, dissolve the soda ash in hot water at a temperature of 50-60°C, then add urea and dissolve it to obtain a 21°Be solution. Then transfer to the reduction reaction pot, slowly pass bromine, control the reaction temperature to 75-85°C, and when the pH reaches 6-7, the reaction end point is reached, stop bromine and stirring, and obtain a sodium bromine solution.   Adjust the pH to 2 with hydrobromic acid, and then adjust the pH to 6-7 with urea and sodium hydroxide to remove the bromate. The solution was heated to boiling, and a saturated solution of barium bromide was added at pH 6-7 to remove the sulfate. If the barium salt is excessive, dilute sulfuric acid can be added to remove it. After removing the miscellaneous reaction material, add activated carbon and leave it for 4-6 hours. After the solution is clear, suction filter, evaporate at normal pressure, and feed it several times in the middle. Stop adding 2 hours before crystallization. Adjust the pH to 6-7 1 hour before crystallization. Separate and dry in a drum dryer to obtain sodium bromide.   Other preparation methods: direct iron and bromine to form ferrous bromide and then azeotrope with sodium carbonate. The by-product is alkali ferrous carbonate, which becomes a colloidal compound of ferrous and high-speed iron after boiling, and is filtered slowly. To avoid this disadvantage, adding bromine twice, mainly iron oxides are obtained, so filtration and washing are easy.
 

  

 

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