Chlorine stabilizer Cyanuric Acid tablet/ granular/ powder swimming pool chemical water treatment chemicals1

Preparation methods of Cyanuric Acid
There are mainly urea pyrolysis method and semi-cyclic method.
(1) Urea pyrolysis method:
According to the different ways of pyrolysis, it is divided into solid-phase melting method and liquid-phase method. Solid-phase method will heat the urea to 200~300 ℃, pyrolysis to get crude cyanuric acid, and then add 15~20% sulfuric acid (or nitric acid, hydrochloric acid), steaming, in the after filtration, washing, drying to get the finished product. This is the main method of industrial production of Cyanuric Acid. The purity of industrial products ≥95%, each ton of product consumption of urea 1200kg. liquid-phase method is carried out in aromatics or mineral oil solvents, the reaction is complete, separation of solvents, washing, drying to get the finished product, the reaction conditions are gentle, corrosiveness is small, but the yield is low.
(2) Half-cycle method:

Cyanuric Acid powder into the rolling disc, in the gradual addition of urea, its molar ratio of 1.7 ~ 2, heating to 190 ℃, continue for half an hour, stop heating, continue to roll until no ammonia generation. Remove a small portion, crushed, dissolved in sulfuric acid, boiling, centrifugal filtration, washing and drying to get the finished product. The rest of the parts continue to cycle rolling.