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[Chemical Knowledge]：The production and manufacturing method and process of bromine.

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The manufacturing method
of bromine
1. Introduction

Bromine is an important chemical production raw material, widely used in medicine, pesticides, dyes, spices, photographic materials, fire extinguishing agents and other fields. Therefore, it is of great significance to study the manufacturing method of bromine for improving the production efficiency of bromine, reducing the cost and improving the quality of products. This paper will introduce the manufacturing method of bromine, including raw material selection, production process, operation points and so on.

2. raw material selection

bromine manufacturing raw materials are mainly seawater, pyrite, sulfuric acid and so on. Among them, seawater is the most commonly used raw material, because seawater is rich in bromide. When selecting raw materials, it is necessary to consider the purity, cost, source and other factors of the raw materials.

3. production process
The manufacturing process of
bromine mainly includes air blowing method, steam distillation method, absorption method and so on. Among them, the air blowing method is the most commonly used production process.

1. Air blowing method

air blowing method is to pass chlorine into seawater containing bromide, to oxidize bromide into bromine, then blow out bromine with air, and then absorb bromine with absorbent. The specific steps are as follows:

(1) Acidify seawater and add chlorine to oxidize bromide to bromide.

(2) air is introduced into sea water to blow out the bromine element to form bromine-containing air.

(3) Absorbs the bromine element in the bromine-containing air with an absorbent to obtain a bromine product.

2. Water vapor distillation method

Water vapor distillation method is a method of distilling bromide in seawater with water, exporting water vapor and bromine vapor together, and then absorbing bromine vapor with absorbent. The specific steps are as follows:

(1) the sea water is heated to boiling, water vapor is introduced, and the water vapor and bromine vapor are exported together. The extracted vapor is cooled

(2), and the bromine vapor is absorbed by an absorbent to obtain a bromine product.

3. Absorption method

absorption method is a method of directly absorbing bromide in seawater with absorbent to obtain bromine products. The specific steps are as follows:

(1) Acidify seawater and add an absorbent to absorb bromide by the absorbent. The bromine in the absorbent is extracted

(2) to obtain a bromine product.

4. operating points

In the manufacturing process of bromine, the following operating points need to be paid attention to:

1. Control the reaction temperature and pH value to ensure the smooth progress of the reaction.

2. Control the proportion of chlorine and air to avoid excessive chlorine corrosion of equipment and excessive air on bromine purity.

3. Select the appropriate absorbent to ensure the purity and yield of bromine.

4. Strengthen equipment maintenance and maintenance to ensure the normal operation of equipment and product quality stability.

5. Conclusion There are many manufacturing methods of

bromine, among which the air blowing method is the most commonly used production process. In the manufacturing process, it is necessary to pay attention to the selection of raw materials, production process, operation points, etc., in order to improve the production efficiency of bromine, reduce costs, and improve product quality.

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