Manufacture of cyanuric acid

Details Manufacture of cyanuric acid Manufacture of cyanuric acid

C - Chemistry, Metallurgy

07

D

260/248.4

C07D 251/32 (2006.01)

Patent

CA 1049013

TITLE: IMPROVEMENT IN THE MANUFACTURE OF CYANURIC ACID ABSTRACT: Acid digester discharge liquor, from the manufacture of cyanuric acid, containing dissolved triazines, ammonium salts and iron, is treated with a mineral base until the pH is about 2.5 to 4 whereby triazines are precipitated while most of the iron remains dissolved. The triazines are separ- ated and recycled back to the digester. The pH of the filtrate is increased to about 11, ammonia is stripped off and recovered leaving an essentially nitrogen free aqueous solution. This can be discarded or concentrated to recover the salts.

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