International name: Calcium hypochlorite

Synonyms: calcium hypochlorite, hypochlorous acid

Chemical formula: CaCl2

Appearance: light powder with a pungent odor

Production: Bulgaria

Packing and storage: bag 20 kg; 1-3 years

 

Description

Lime chloride is a mixture of the diacids of calcium hypochlorite, oxychloride, chloride and calcium hydroxide. It is used as a strong oxidizer in the textile and paper industry for the bleaching of fabrics and cellulose, in some chemical industries for the production of chloroform, chloropicrin, as a decontamination and disinfectant, for disinfecting the soil near granaries from granary pests.

 

Properties

Odor is acrid chlorine. Density (bulk density) at 20 ° C: 0.6 g / cm3. Melting point: decomposes at 177 ° C (350 ° F), releases oxygen. The vapor density (air r = 1): 6.9. Solubility: Soluble in water, reacts by releasing chlorine gas. Chlorine consists of calcium chloride, calcium hypochlorite and hydrate, calcium oxide in various ratios depending on the technical conditions of production and storage conditions of the preparation. Obtained by passing gaseous chlorine through slaked lime (puschku). White powder with a pungent odor, slightly soluble in water. The substance is not combustible. When interacting with acids and moisture, it liberally releases chlorine at room temperature. Technical bleach is unstable. In the open air, it adds moisture and carbon dioxide and turns into a semi-liquid or lumpy mass. In the presence of air, sunlight, heat and moisture, as well as organic impurities (sawdust, coal dust, oil) and metals acting catalytically (iron, copper, zinc, tin, cobalt, nickel), lime decomposes, which sometimes results in spontaneous combustion with a flash and explosion.

 

Receiving

Depending on the method of obtaining lime, chlorine is produced in two grades: A and B. Chlorine lime grade A is obtained by chlorination of pushers in a fluidized bed, grade B - by chlorination of cotton grass in Buckman apparatus.

 

Application

Bleached lime is used:

- in the textile industry for bleaching a variety of fabrics;
- in the paper industry as a strong oxidant for the production of cellulose;
- indispensable in the technological processes of obtaining chloroform and chloropicrin;
- as a disinfectant, degassing and disinfecting agent, for example, for water purification.

Safety requirements

Dust of bleached lime and evolved chlorine irritates the mucous membranes of the respiratory tract, as well as the skin of a person.
Lime chlorine is not flammable, but, being a strong oxidizer, can come into contact with organic products and cause them to burn. When working with chlorine lime, use protective clothing, filtering gas mask.
Chlorine, which is released from bleach, refers to substances of the 2nd class of danger.

 

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