Cyanuric acid

Yellowish, crystalline solid

Fixed

2.5 g · cm -3

320 ° C ( decomposition)

Sparingly soluble in water: 2 g · l-1 (20 ° C)

Attention

7700 mg · kg -1 ( LD50, rat, oral)

Template: Infobox chemical / molecular formula search available

Cyanuric acid (1,3,5- triazine-2 ,4,6 -triol ), and isocyanuric acid (1,3,5- triazine-2 ,4,6 -trione ) are tautomeric to each other chemical compounds with the empirical formula C3H3N3O3. Cyanuric acid forms colorless crystals containing 2 mol per mol of cyanuric acid crystal water which escapes in dry air. The connection is one of the heterocycles; cyanuric acid only has aromatic character.

Production and representation

Cyanuric acid can be prepared by hydrolysis of cyanuric chloride, win decomposition of melamine by acids or by heating of biuret or urea at 200-300 ° C. On an industrial scale cyanuric acid is obtained by pyrolysis of urea. The reaction starts at about 175 ° C.

Properties

Cyanuric acid and Isocyanuric are the trimerization of cyanic acid and are in equilibrium, which means that a form may pass into the other. Therefore, cyanuric acid and isocyanuric acid can be distinguished only in its derivatives.

In water, the compound is not very soluble, wherein the pH of the saturated solution is from 3.8 to 4.

When heated cyanuric acid can monomerize to cyanic acid in a violent reaction.

Use

In particular, cyanuric acid is used as starting material for the Trichlorisocyanursäuresynthese. This is an important disinfectant and is also used for the chlorination of swimming pools. The problem is the accumulation of cyanuric acid in the water, since the validity of the chlorine is reduced. At higher concentrations of cyanuric acid in the bath water (from about 40 mg / l), the dosage of chlorine- based disinfectants must therefore be increased in order to achieve consistent germ killing.

However, cyanuric acid is also used in the production of varnish auxiliaries, and as raw material for the lab scale Cyansäuregewinnung use.

Isocyanuric is used as the starting material for production of triglycidylisocyanurate, a curing agent for powder coatings.