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EC number: 203-618-0
CAS number: 108-80-5
This patent provides data on the pyrolysis of urea to CYA in diphenyl
and diphenyl oxide solvents at 220-258ºC for 2-3 hours. The isolated
yield of CYA was 90% or higher.
Cyanuric acid was produced by the pyrolysis of urea to using sulfolane
or 3 -methylsulfolane solvent at 205-210ºC for 2.5 hours. The isolated
yield of CYA was 93-97%.
Cyanuric acid is stable in acetone, tetrahydrofuran, dioxane, methyl
ethyl ketone, ethylene glycol ethers, ethyl acetate, isopropyl acetate,
butyl acetate, alkyl ethers, ethylene glycol dimethyl ether, ethylene
glycol monomethyl ether acetate, ethylene glycol diethyl ether, ethylene
glycol monoethyl ether acetate. These are suitable solvents which are
used as reaction medium for the acylation of cyanuric acid.
This patent provides data on the pyrolysis of urea to CYA in
N-cyclohexylpyrrolidone solvent at 225-240ºC for 0.5-4 hours. The
isolated yield of CYA was 95-99%.
Ratio ml solvent/g urea
Cyanuric acid %
Cresol (USP) as solvent
Tetramethylurea as solvent
Diethylene glycol monomethyl ether solvent
Dipropylene glycol monomethyl ether solvent
Dimethylformamide as solvent
Diethylacetamide as solvent
The quantities of materials and rates of urea addition along with the
results obtained are shown in table 1.
Cyanuric acid purity as a function of urea addition time
Urea addition time (hrs)
G of urea per hour per grams of solvent
Total ammelide and ammeline %
A number of United States patents have been cited which demonstrate that
cyanuric acid can be prepared by the pyrolysis of urea. The production
of cyanuric acid involves dissolving the urea in a suitable organic
solvent and heating to a high temperature. The patents demonstrate that
often high yields of cyanuric acid are obtained by this method and
therefore provide a reasoned weight of evidence that cyanuric acid is
stable in a variety of organic solvents.
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