Hydrogen chloride is widely used in industry. Electronic grade hydrogen chloride is mainly used in the electronic industry.

1. Organic synthesis
For example, under the condition of 180 ℃ ~ 200 ℃ and mercury salt (such as HgCl2) as catalyst, hydrogen chloride reacts with acetylene to produce vinyl chloride, and then polymerizes into polyvinyl chloride under the action of initiator.

2. Bleaching and dyeing industry
For example, hydrogen chloride should be used in the pickling of cotton cloth after bleaching and the neutralization of residual alkali after mercerization of cotton cloth. In the process of printing and dyeing, some dyes are insoluble in water and need to be treated with hydrochloric acid to form soluble hydrochloride before they can be used.

3. Metal processing
For example, for the pretreatment of iron and steel parts, first wash them with caustic soda solution to remove oil stains, and then soak them in hydrochloric acid; Before metal welding, it is necessary to apply a little hydrochloric acid on the welded junction, which can dissolve the metal oxide to remove the rust. In this way, the metal surface can be plated and welded firmly. The material can also be removed by corrosion through dissolution reaction with some metals (such as aluminum).

4. Food industry
For example, when making chemical soy sauce, soak the boiled soybean cake and other raw materials in a solution containing a certain amount of hydrochloric acid and maintain a certain temperature. Hydrogen chloride has a catalytic effect, which can promote the hydrolysis of complex proteins. After a certain time, it will produce delicious amino acids, which are neutralized with caustic soda (or soda) to obtain sodium amino acid. The principle of making monosodium glutamate is similar.

5. Production of inorganic and organic drugs
Hydrogen chloride is a strong acid. It can react with some metals, metal oxides, metal hydroxides and most metal salts (such as carbonate, sulfite, etc.) to form hydrochloride. Therefore, hydrochloric acid is used in the production of many inorganic drugs.

In medicine, many organic drugs, such as novocaine and thiamine hydrochloride (preparation of vitamin B1), are also made of hydrochloric acid. Yanhe chemical specializes in 3.0N ~ 5.0N hydrogen chloride.