Purification of cyanuric acid

Details Purification of cyanuric acid Purification of cyanuric acid

1989-12-21

1990-10-16

Ford, John M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C07D25132

Patent

active

049636740

ABSTRACT:
A process for the purification of crude cyanuric acid containing aminotriazine compounds as impurities which comprises digesting the crude cyanuric acid in an aqueous solution containing low concentrations of a mineral acid. The mineral acid is, for example sulfuric acid, nitric acid, hydrochloric acid, or phosphoric acid. The digestion is operated at a temperature in the range of from about 120.degree. C. and about 220.degree. C. and autogenous pressure using a stoichiometric ratio of sulfuric acid to aminotriazine compounds of less than 1, to produce a slurry of purified cyanuric acid in an acid depleted ammonium sulfate solution.
Purification of cyanuric acid by the process of the present invention permits a substantial reduction in the amounts of acid used in the digestion and the base required for ammonia stripping and neutralization of the spent acid from the digestion. This provides significant cost savings in the digestion and waste treatment methods.

REFERENCES:
patent: 2943088 (1960-06-01), Westfall
patent: 3107244 (1963-10-01), Robertson
patent: 3969352 (1976-07-01), Berkowitz
patent: 4029660 (1977-06-01), Berkowitz
Japanese 76-059133 Derwent Abstract 11/26/77.

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