Preparation methods of Cyanamide CAS 420-04-2

It can be made by using lime nitrogen (CaCN2) as raw material and reacting with sulfuric acid. Put water in the reactor, cool with ice brine, put in lime nitrogen, keep the temperature between 0-15℃, add 5% sulfuric acid solution dropwise, adjust pH=6, keep for 20min, filter, wash with water, and return to the reactor , Then add lime nitrogen, repeat the above operation 2 times, the obtained filtrate is thin-film concentrated, keeping a certain temperature, after concentration, the content reaches 50%-55%, and a 50% cyanamide solution is obtained. Reaction equation:

It can also be prepared by reacting calcium cyanamide with carbon dioxide and water.

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Names and Identifiers of Cyanamide CAS 420-04-2
Name Cyanamide
Synonyms Cyanamide calcium derivative
Cyanamide solution
Hydrogen cyanamide
CAS 420-04-2
EINECS 206-992-3
InChI InChI=1/CH2N2/c2-1-3/h2H2

Physico-chemical Properties of Cyanamide CAS 420-04-2
Molecular Formula CH2N2
Molar Mass 42.04 g/mol
Density 1.282
Melting Point 45℃
Boling Point 260℃
Flash Point 141℃
Solubility 775 g/L
Refractive Index 1.405

Risk and Safety of Cyanamide CAS 420-04-2
Hazard Symbols T – Toxic
Toxic
Risk Codes R21 – Harmful in contact with skin
R25 – Toxic if swallowed
R36/38 – Irritating to eyes and skin.
R43 – May cause sensitization by skin contact
Safety Description S22 – Do not breathe dust.
S3 – Keep in a cool place.
S36/37 – Wear suitable protective clothing and gloves.
S45 – In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
UN IDs UN 2811

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CAS 420-04-2, Cyanamide, CH2N2
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