Sodium bromide (NaBr) is an importantinorganic compound with various preparation methods and wide application fields.
Preparation method
1. Neutralization method: This is a commonmethod of preparing sodium bromide, which can be achieved by the reaction of sodium hydroxide (NaOH) with hydrobromic acid (HBr).
- When using sodium carbonate (Na2CO3) as araw material, it can react with hydrobromic acid to form sodium bromide.
- In the neutralization process, sodiumbicarbonate (NaHCO3) can also be used as a raw material, through the neutralization reaction with hydrobromic acid to obtain sodium bromide
solution, followed by concentration, cooling, filtration and drying steps to obtain anhydrous sodium bromide.
2. Reduction method: Urea reduction methodis a method of converting bromine into sodium bromide under alkaline conditions, using urea as a reducing agent.
- In this process, sodium carbonate isdissolved in hot water, after adding urea, slowly add bromine, control the reaction temperature at 75-85℃, until the pH value reaches 6-7, to complete the preparation of sodium bromide.
3. Ion exchange method: Although thespecific process of ion exchange method is not described in detail in the search results, it is a method of preparing sodium bromide by ion exchange
resin.
Application field
1. Photographic industry: Sodium bromide isused to prepare film photographic solution and is an indispensable chemical in the photographic process.
2. Medical field: In medicine, sodiumbromide is used in the production of diuretics and sedatives for the treatment of neurasthenia, nervous insomnia and other conditions.
3. Flavor industry: Sodium bromide is usedin the production of synthetic flavors and is an important raw material for the manufacture of certain flavors.
4. Printing and dyeing industry: In theprinting and dyeing industry, sodium bromide is used as a brominating agent to help improve the dyeing effect.
5. Analytical reagents: Sodium bromide canbe used for trace determination of cadmium and other metal elements, is an important reagent in analytical chemistry.
6. Other industrial applications: Sodiumbromide is also used in the electroplating industry, fire protection system, dye industry and other fields, as an additive or intermediate to improve
product quality and performance.
Security and storage
Although sodium bromide is low toxic, ithas certain irritants and needs to be properly stored and disposed of.
- Should be stored in a dry, cool,well-ventilated place, avoid contact with fire and heat sources, to prevent sunlight exposure.
- When handling, avoid ingestion,inhalation, and contact with skin and eyes to reduce health risks.
In summary, the preparation methods ofsodium bromide mainly include neutralization method, reduction method, etc., and its application fields involve many aspects such as photographic industry, medicine, fragrance industry, printing and dyeing industry. In the operation and storage process, it is necessary to pay attention to safety precautions to
ensure the health of personnel and environmental safety.