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| Product Name: | ISOCYANIC ACID | | Synonyms: | Bayhydur XP 2451/1;Polyisocyanates;HN=C=O;HNCO;Hydrogen isocyanate;ISOCYANIC ACID;Isocyanic acid(6CI,8CI,9CI);JACS-75-13-8 | | CAS: | 75-13-8 | | MF: | CHNO | | MW: | 43.02 | | EINECS: | | | Product Categories: | | | Mol File: | 75-13-8.mol |  |
| | ISOCYANIC ACID Chemical Properties |
| Melting point | -86 °C | | Boiling point | 41.91°C (rough estimate) | | density | 1.04±0.1 g/cm3(Predicted) | | refractive index | 1.4300 (estimate) | | PH | 3.35(1 mM solution);2.76(10 mM solution);2.23(100 mM solution) | | EPA Substance Registry System | Isocyanic acid (75-13-8) |
| | ISOCYANIC ACID Usage And Synthesis |
| Chemical Properties | Isocyanic acid (HNCO) is a volatile, moderately acidic compound, and the simplest member of the isocyanate family.
Isocyanic acid is a colourless, volatile, poisonous inorganic compound with the formula HNCO; the simplest stable chemical compound that contains carbon, hydrogen, nitrogen, and oxygen, the four most commonly-found elements in organic chemistry and biology. It is a hydracid and a one-carbon compound. It is a conjugate acid of a cyanate. It is a tautomer of a cyanic acid.
| | Physical properties | Isocyanic acid (ICA, Cas no. 75-13- 8) is a strong organic acid with a kPa of 3.5. ICA is a very reactive compound that can readily transform into other substances. It can lose a proton in an aqueous environment under certain conditions, particularly if a strong base is present, forming an isocyanate. ICA is a tautomer of the less stable, cyanic acid (CAS no. 420-05-3). These forms interchange by a tautomerisation reaction, involving the migration of a hydrogen atom or proton accompanied by a switch of a double bond. ICA is an unstable liquid above 0o C with a tendency to polymerise. The primary polymerisation product, which is also generated in the gas form, is cyanuric acid (CAS no. 108-80-5), a cyclic trimer. ICA is soluble in water, but disintegrates both via ionisation and by formation of ammonia and carbon dioxide.
| | Uses | The primary use of methyl isocyanate (MIC, CAS no. 624-83-9) is as a chemical intermediate in the production of carbamate pesticides. MIC is also used to produce polyurethane foam and plastics (ATSDR, 2002). Isocyanic acid (ICA, Cas no. 75-13- 8) does not have commercial uses because of its instability. The potential for occupational exposure to ICA largely arises when it is generated as a thermal degradation product of other industrial processes. Ethyl isocyanate is a liquid used commercially to make pharmaceuticals and pesticides (NJDHSS, 2000). Phenyl isocyanate (PIC, CAS no. 103-71-9) is a trace constituent in commercial diphenyl methane diisocyanate products.
| | Preparation | Isocyanic acid was prepared in pure form by reaction of KOCN or NaOCN with stearic or oxalic acid in good yield.
| | Definition | ChEBI: A colourless, volatile, poisonous inorganic compound with the formula HNCO; the simplest stable chemical compound that contains carbon, hydrogen, nitrogen, and oxygen, the four most commonly-found elements in organic chemistry and biology. | | Hazard | Severe explosion risk. Strong irritant to eyes, skin and mucous membranes. |
| | ISOCYANIC ACID Preparation Products And Raw materials |
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