cyanic acid Chemical Properties
- Melting point:
- Boiling point:
- bp760 23.5°
- d420 1.140; d4-20 1.156
- refractive index
- 1.4300 (estimate)
- 3.7(at 25℃)
- Exposure limits
- No exposure limit has yet been set for this compound.
- EPA Substance Registry System
- Cyanic acid (420-05-3)
cyanic acid Usage And Synthesis
Cyanic acid is prepared in the laboratory by dry distillation of cyanuric acid, C3N3(OH)3.
Cyanic acid decomposes on heating. Rapid heating may cause explosion. When heated to high temperatures, it decomposes forming carbon dioxide, water, and nitrogen oxides:
4NCOH + 7O2 4CO2 + 4NO2 + 2H2O
It dissolves in water decomposing to carbon dioxide and ammonia. Although the reaction occurs at ordinary temperatures, it is slow in dilute aqueous solutions at ice temperature.
NCOH + H2O → CO2 + NH3
The compound polymerizes on standing, forming cyanuric acid, an oxygen heterocylic compound, 1,3,5-trioxane-2,4,6-triimine, C3H3N3O3.
Colorless liquid or gas with an acrid smell; mp -86°C (-122.8°F); bp 23.5°C (74.3°F); density 1.140 at 20°C (68°F); soluble in water, alcohol, ether, benzene, and toluene.
In formation of some cyanates.
Hydrogen cyanate is used in the preparation of cyanates.
cyanic acid: An unstable explosiveacid, HOCN. The compound has thestructure H–O–C≡N, and is also calledfulminic acid. Its salts and esters arecyanates (or fulminates). The compoundis a volatile liquid, whichreadily polymerizes. In water it hydrolysesto ammonia and carbondioxide. It is isomeric with anotheracid, H–N=C=O, which is known asisocyanic acid. Its salts and esters areisocyanates.
Hydrogen cyanate is a severe irritant to the eyes, skin, and mucous membranes. Exposure to this compound can cause severe lacrimation. Inhalation can produce irritation and injury to the respiratory tract. LD50 values are not reported.
Flammable; the liquid can explode when heated rapidly.
Hydrogen cyanate can be disposed of in the drain in small amounts. It decomposes in water forming CO2 and NH3.
cyanic acid Preparation Products And Raw materials
- TETRABUTYLAMMONIUM CYANATE
- POTASSIUM CYANATE, [14C]
- 4,4-BIS(PHENYL CYANATE)METHANE
- TETRAETHYLAMMONIUM CYANATE
- PHENYL CYANATE
- Sodium cyanate
- cyanic acid
- P-NITROPHENYL CYANATE
- SODIUM CYANATE, [14C]
- DIALLYLBISPHENOL A CYANATE ESTER
- SILVER CYANATE
- LEAD CYANATE
- 4-METHOXYPHENOL CYANATE ESTER
- Potassium cyanate