Hydrogen chloride is a colorless, non-flammable gas with an extremely irritating odor and a white haze in the air. Hydrogen chloride gas can be used as catalyst, organic synthesis raw materials and ultra-pure reagent raw materials, can also be absorbed by pure water to produce high-purity hydrochloric acid, used in reagents, food industry, fine chemical industry, medicine, etc., high-purity hydrogen chloride gas is a very wide range of industrial gases. Because of the wide use area and large demand, the preparation of hydrogen chloride gas is very important.

The following are some common hydrogen chloride gas preparation methods:

1. The industrial drying HCL is made by dropping concentrated hydrochloric acid into concentrated sulfuric acid (heat absorption), which is dried by concentrated sulfuric acid and buffered by a buffer tank. Because the mixture of sodium chloride and concentrated sulfuric acid is hard, it is not a good idea.

2. Large-scale industrial manufacturing method is to generate hydrogen and chlorine gas through electrolysis of sodium chloride solution, and then combustion in the synthesis furnace to generate hydrogen chloride gas; If you need less, you can buy hydrochloric acid solution (31%) from a chlor-alkali factory, then gas extraction produces hydrogen chloride gas, and then dry hydrogen chloride gas through concentrated sulfuric acid or freeze drying.

3. Concentrated hydrochloric acid is commonly used in industrial production. The cost of HCl rigid bottle is high and the production is inconvenient.

4. With chlorosulfonic acid drops added to hydrochloric acid, then dry with concentrated sulfuric acid.

5. In non-chlorine-alkali enterprises, hydrogen chloride is generally prepared by adding hydrochloric acid to phosphorus trichloride, and phosphite is also produced by side. There is one authorized to sell hydrogen chloride gas cylinders in China. It is very convenient to use hydrogen chloride gas cylinders, but the price is a little higher.

6. It is better to drop concentrated hydrochloric acid into concentrated sulfuric acid to generate hydrogen chloride gas to participate in the reaction.

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