Sodium cyanate

Structural formula
General
Surname	Sodium cyanate
Molecular formula	NaOCN
Brief description	colorless odorless solid
External identifiers / databases
EC number	213-030-6
ECHA InfoCard	100,011,846
PubChem	517096
Wikidata	Q412708
properties
Molar mass	65.01 g mol −1
Physical state	firmly
density	1.89 g cm −3
Melting point	550 ° C
solubility	moderate in water (110 g l −1 at 20 ° C)
safety instructions
GHS hazard labeling from Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary Caution
H and P phrases	H: 302-412
	P: 273
Toxicological data	1500 mg kg −1 ( LD 50 , rat , oral )
Thermodynamic properties
ΔH f 0	−405.4 kJ / mol
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Sodium cyanate is the sodium salt of cyanic acid with the formula NaOCN.

properties

NaOCN is a colorless, odorless and water-soluble salt with a melting point of 550 ° C. It decomposes before boiling point, producing hydrogen cyanide , sodium oxide , nitrogen oxides , carbon monoxide, and carbon dioxide . Its aqueous solution has an alkaline reaction. In an aqueous solution , it slowly hydrolyzes to ammonia and formate .

Manufacturing

Sodium cyanate is produced in the laboratory by introducing air into a sodium cyanide melt.

{\ displaystyle \ mathrm {2 \ NaCN \ + \ O_ {2} \ \ longrightarrow \ 2 \ NaOCN}}

In technology, it is produced by melting urea and sodium carbonate together .

{\ displaystyle \ mathrm {2 \ CO (NH_ {2}) _ {2} \ + \ Na_ {2} CO_ {3} \ \ longrightarrow}}

{\ displaystyle \ mathrm {2 \ NaOCN \ +2 \ NH_ {3} \ + \ CO_ {2} \ + \ H_ {2} O}}

use

Sodium cyanate is used in the manufacture of herbicides as a bridging agent between reactive molecules. Some manufacturers of the insecticide methyl isocyanate use an alternative reaction procedure using sodium cyanate. In steel processing , both sodium and potassium cyanate are used to harden the surface of steel parts. An example of this are the running surfaces of the cylinders in piston engines.

Sodium cyanate is used as a textile auxiliary for protein fibers and for the production of substituted ureas.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Entry for CAS no. 917-61-3 in the GESTIS substance database of the IFA , accessed on April 13, 2011(JavaScript required) .
↑ Entry on sodium cyanate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers and / or distributors can expand the harmonized classification and labeling .
↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-20.

[GESTIS-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Entry for CAS no. 917-61-3 in the GESTIS substance database of the IFA , accessed on April 13, 2011(JavaScript required) .

[CLP_100.011.846-2] Entry on sodium cyanate in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on February 1, 2016. Manufacturers and / or distributors can expand the harmonized classification and labeling .

[CRC90_5_20-3] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-20.