Calcium hypochlorite production line manufacturers take you to understand the production method of industrial calcium hypochlorite

Calcium hypochlorite production line manufacturers tell you that the quality of industrial calcium hypochlorite and bleaching powder is measured by the content of available chlorine (referring to the active chlorine released when reacting with hydrochloric acid), storage stability and solubility in water. The effective chlorine of commercial bleaching powder is 30% to 35%, which is easily decomposed by heat and moisture. Calcium hypochlorite production line manufacturers tell you that the available chlorine content of industrial calcium hypochlorite is 70% to 75%, and it contains less water-absorbing calcium chloride, so it is stable, easy to store and transport, and is usually processed into fine granules.

The production methods of industrial calcium hypochlorite can be divided into three types:
1. Caustic soda lime chlorination method
Sodium hydroxide is added to lime milk Ca(OH)2, and chlorine gas is used for chlorination, and Ca(ClO)2·NaClO·NaCl·12H2O trimeric salt crystals are precipitated. The manufacturer of Calcium hypochlorite production line tells you that the separation method is to chlorinate the trimeric salt crystals with lime milk to obtain a suspension containing calcium chloride. When the molar ratio of calcium chloride and sodium hypochlorite in the trimeric salt reaches 1:2, the sodium hypochlorite will dissolve. All converted to calcium hypochlorite. Then, the precipitation is separated from the mother liquor to obtain industrial calcium hypochlorite containing more than 70% of available chlorine. This method has easy-to-obtain raw materials and stable operating conditions.
2. Lime chlorination method
It is prepared by the interaction of milk of lime and chlorine gas. According to the change of lime milk concentration and chlorination conditions, products of different purities can be obtained. At 40 ℃, the concentrated lime milk is chlorinated, and the initially precipitated solid phase component is Ca(ClO)2·2Ca(OH)2. After separation and drying, a product containing 45% available chlorine can be obtained. When continuing to chlorinate the Ca(ClO)2 2Ca(OH)2 suspension, depending on the operating conditions used, the 3Ca(ClO)2 2Ca(OH)2 2H2O precipitation can be obtained, or the neutral Ca(ClO) )2·3H2O precipitation. The manufacturer of the Calcium hypochlorite production line tells you that the former is easy to be filtered out from the mother liquor, and a product containing about 60% of available chlorine can be obtained. After the neutral calcium hypochlorite is dried at low temperature, an anhydrous calcium hypochlorite product containing 70% to 80% of available chlorine in industry can be obtained.
3. Hypochlorite lime neutralization method
It is prepared by neutralizing hypochlorous acid with calcium hydroxide (solid or slurry). The manufacturer of the Calcium hypochlorite production line tells you that the main difficulty of this method lies in the preparation of pure hypochlorous acid with a relatively high concentration, and hypochlorous acid is obtained by chlorination of an aqueous alkali solution (alkali metal hydroxide or carbonate).