Calcium cyanamide: Difference between revisions
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(Created page with "{{Compound|chemf=CaCN2|group=salts |mm=80.102|density=2.29|mp=1340|sol_aq=reacts |stp_p=solid|stp_q=white }} ==Uses== ===Other=== * Production of sodium cyanide * Production of ammonia * Production of cyanamide ==Natural occurrence== * '''Does not''' occur naturally. ==Hazards== ==Character== ==Production== ===Extraction=== ===Synthesis=== ====from urea==== # Add calcium oxide to molten urea and maintain heat until it is a (mostly) anhydrous s...") |
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===Synthesis=== | ===Synthesis=== | ||
====from urea==== | ====from urea==== | ||
# Add [[calcium oxide]] to molten [[urea]] and maintain heat until it is a (mostly) anhydrous solid | # Add [[calcium oxide]] to molten [[urea]] and maintain heat until it is a (mostly) anhydrous solid '''calcium cyanate''' | ||
#:{{#Chem: CaO + 2 CO(NH2)2 = Ca(OCN)2 + 2 NH3 + H2O }} | #:{{#Chem: CaO + 2 CO(NH2)2 = Ca(OCN)2 + 2 NH3 + H2O }} | ||
# Calcine at 800 °C in the '''absence''' of [[oxygen]], converting the cyanate to cyanamide | # Calcine at 800 °C in the '''absence''' of [[oxygen]], converting the cyanate to cyanamide | ||
Latest revision as of 22:43, 4 December 2024
| Chemical formula | CaCN2 |
|---|---|
| OTP appearance | white solid |
| Molar Mass(g/mol) | 80.102 |
| Density(g/cc) | 2.29 |
| Melting Point(°C) | 1340 |
| Solubility in water(g/L) | reacts |
| NFPA 704 |  0
0
0
|
Uses
Other
- Production of sodium cyanide
- Production of ammonia
- Production of cyanamide
Natural occurrence
- Does not occur naturally.
Hazards
Character
Production
Extraction
Synthesis
from urea
- Add calcium oxide to molten urea and maintain heat until it is a (mostly) anhydrous solid calcium cyanate
- CaO + 2 CO(NH2)2 → Ca(OCN)2 + 2 NH3 + H2O
- Calcine at 800 °C in the absence of oxygen, converting the cyanate to cyanamide
- Ca(OCN)2{CaCN2 + CO2800 °C}→
- Ca(OCN)2 + 3 O2{2 CaCO3 + 2 N2 + 2 CO2 // incorrect: oxygen available800 °C}→
- Ca(OCN)2
from air nitrogen
- Calcium carbide powder is heated at about 1,100 °C in an electric furnace into which nitrogen is passed for several hours. The product is cooled to ambient temperatures and any unreacted carbide is leached out cautiously with water.[1]
- CaC2 + N2{CaCN2 + C1100°C}→
- A similar process, called the "Tunnel Kiln" process uses calcium chloride as a coreactant occurs at a much lower temperature[1]
- CaC2 + N2{CaCl2CaCN2 + C700°C}→
Testing
Purification
Storage
Watertight dry container
Disposal
See Also
References
- ↑ 1.0 1.1 (1978) "Calcium Cyanamide"
Encyclopedia of Chemical Processing and Design 6; pp41-46. Marcel Dekker
ISBN: 0-8247-2456-9