Chlorine gas and hydrogen gas in the synthesis furnace combustion generally can reach the highest 2000 degrees, generated hydrogen chloride gas after cooling packing insulation absorption, absorption of the falling film to produce hydrochloric acid. Concentrated hydrochloric acid is separated in an analytical tower, and azeotropic hydrochloric acid is obtained at the bottom and hydrous hydrogen chloride gas is obtained at the top. The hydrogen chloride gas is cooled by circulating water, chilled or washed with concentrated sulfuric acid to obtain dry hydrogen chloride.

In chlor-alkali production enterprises, chlorine gas and hydrogen are usually used to synthesize hydrogen chloride directly, and hydrochloric acid is prepared by absorbing hydrogen chloride with water.

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Hydrogen chloride (HCl), a molecule of hydrogen chloride made up of one chlorine atom and one hydrogen atom, is a colorless, pungent gas. Its aqueous solution is commonly known as hydrochloric acid, scientific name hydrochloric acid. The relative molecular weight is 36.45. Hydrogen chloride is easily soluble in water, at 0℃, 1 volume of water can dissolve about 500 volumes of hydrogen chloride.

Hydrogen chloride is mainly used in the preparation of dyes, spices, drugs, various chlorides and corrosion inhibitors.