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[Chemical Knowledge]：Manufacturing method and process flow of industrial synthetic acid

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The manufacturing method
of industrial synthetic acid
1. Introduction

In the field of industrial chemical production raw materials, industrial synthetic acid is an important compound, widely used in various industries, such as metallurgy, medicine, pesticides, food and so on. Common industrial synthetic acids are sulfuric acid, nitric acid, hydrochloric acid, etc. This article will detail the manufacturing methods of these industrial synthetic acids. Manufacturing method of

2. sulfuric acid
manufacturing method of
sulfuric acid mainly adopts contact method. The specific steps are as follows:

1. Pyrite roasting: pyrite (mainly composed of FeS2) and air are roasted at high temperature to generate sulfur dioxide gas.
2. Sulfur dioxide oxidation: sulfur dioxide gas is introduced into the catalyst layer, and air is introduced for oxidation reaction to generate sulfur trioxide gas.
3. Sulfur trioxide absorption: Sulfur trioxide gas is absorbed by concentrated sulfuric acid to generate sulfuric acid. The manufacturing method of

3. nitric acid The manufacturing method of

nitric acid mainly includes the following steps:

1. Ammonia oxidation: ammonia gas is mixed with air, passed into the platinum mesh catalyst layer, and oxidation reaction is carried out at high temperature to generate nitric oxide gas.
2. nitric oxide oxidation: nitric oxide gas is mixed with air again, and the manganese dioxide catalyst layer is introduced to carry out oxidation reaction to generate nitrogen dioxide gas.
3. Nitrogen dioxide absorption: absorption of nitrogen dioxide gas with water to generate nitric acid. Production method of

4. hydrochloric acid

hydrochloric acid is mainly produced by reacting common salt (sodium chloride) with sulfuric acid. The specific steps are as follows:

1. Salt electrolysis: salt is dissolved in water and electrolyzed by direct current to generate chlorine, hydrogen and sodium hydroxide.
2. Chlorine and hydrogen reaction: chlorine and hydrogen are mixed in a certain proportion, ignited reaction, hydrogen chloride gas is generated.
3. Hydrogen chloride absorption: Absorb hydrogen chloride gas with water to generate hydrochloric acid.
Precautions for
5.

In the process of manufacturing industrial synthetic acid, the following matters need to be paid attention to:

1. Strictly control the reaction temperature and pressure to ensure that the reaction proceeds within a safe range.
2. Use a suitable catalyst to increase the reaction rate and product selectivity.
3. Effective separation and treatment of reaction products and by-products to avoid environmental pollution.
4. Strengthen equipment maintenance and overhaul to ensure normal operation of equipment and improve production efficiency.

6. conclusion

industrial synthetic acid has a wide range of applications in the field of chemical production raw materials, and its manufacturing methods vary with different types of acid. In the manufacturing process, it is necessary to strictly control the reaction conditions, use appropriate catalysts, effectively treat the products and by-products, and pay attention to equipment maintenance and overhaul. By mastering these manufacturing methods, enterprises can improve production efficiency, reduce costs, and contribute to the green development of the chemical industry.

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