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2020
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Main components of bleaching powder
CAS: harmful substances
Active ingredient: Ca (CLO) 2 -- calcium hypochlorite
Preparation: chlorine gas is introduced into lime milk
2 Cl2 + 2 Ca(OH)2 → CaCl2 + Ca(ClO)2 +2 H2O
Bleaching powder is made by the reaction of chlorine with calcium hydroxide (hydrated lime). Because absolutely dry calcium hydroxide does not react with chlorine, chlorine can only be absorbed by calcium hydroxide. Therefore, in industry, hydrated lime containing less than 1% free water is used for chlorination, and the chlorine gas used also contains less than 0.06% water. The free water in these raw materials is used to hydrolyze chlorine to produce acids (HClO, HCl), which are neutralized by hydrated lime.
Then, the water precipitated from calcium hydroxide during the chlorination reaction makes the chlorine continue to hydrolyze, so that more calcium hydroxide participates in the reaction process and forms a series of compounds. Bleaching powder is a complex of these compounds.
Bleaching powder is easy to be exposed to air and fail: Ca (CLO) 2 + 2H2O + 2co2 → Ca (HCO3) 2 + 2hclo
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