Trichloroisocyanuric acid
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| General | ||||||||||||||||
| Surname | Trichloroisocyanuric acid | |||||||||||||||
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| Molecular formula | C 3 Cl 3 N 3 O 3 | |||||||||||||||
| Brief description |
white solid with a pungent odor |
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| properties | ||||||||||||||||
| Molar mass | 232.41 g mol −1 | |||||||||||||||
| Physical state |
firmly |
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| density |
2.07 g cm −3 |
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| Melting point |
225–230 ° C (decomposition) |
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| solubility |
little in water (12 g l −1 at 20 ° C) |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||||||||
Trichloroisocyanuric acid (1,3,5-trichloro-1,3,5-triazine-2,4,6-trione) is a chemical compound that forms colorless, moisture-sensitive crystals.
Manufacturing
Trichloroisocyanuric acid by chlorination of cyanuric acid or isocyanuric acid produced.
properties
Trichloroisocyanuric acid forms hypochlorous acid with water . This breaks down with disproportionation to chloric acid and hydrochloric acid .
use
Trichloroisocyanuric acid is mainly used for the long-term chlorination of water in swimming pools . This is done using massive tablets weighing up to 250 g. Due to the low solubility, the active ingredient is only released slowly, which enables the long-term effect.
Similar, but easily soluble and fine-grained substances are used for shock chlorination.
The problem is the accumulation of cyanuric acid in the water, as this reduces the effectiveness of the chlorine. In the case of higher concentrations of cyanuric acid in the pool water (from around 40 mg / l), the dosage of chlorine-based disinfectants must therefore be increased in order to achieve constant germicidal action.
In the laboratory, trichloroisocyanuric acid can be used to produce elemental chlorine by adding dropwise hydrochloric acid :
N -chloroisocyanate can be obtainedfrom trichloroisocyanuric acidby thermolysis .
proof
Trichloroisocyanuric acid can be easily detected due to its oxidizing properties and z. B. determine iodometrically . For this purpose, a sample dissolved in water is mixed with potassium iodide and the iodine formed immediately is titrated with sodium thiosulphate solution and starch as an indicator .
Related links
Individual evidence
- ↑ a b c d e f Entry on trichloroisocyanuric acid in the GESTIS substance database of the IFA , accessed on February 1, 2016(JavaScript required) .
- ↑ a b Entry on trichloroisocyanuric acid. In: Römpp Online . Georg Thieme Verlag, accessed on December 2, 2016.
- ↑ Entry on Symclosene in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .
- ↑ E. Nachbaur, W. Gottardi: Presentation and properties of chloroisocyanate . In: Monthly magazine for chemistry . tape 97 , no. 1 , 1966, p. 115-120 , doi : 10.1007 / bf00905495 ( PDF ).