Calcium Cyanamide

Title: Calcium Cyanamide
CAS Registry Number: 156-62-7
Additional Names: Calcium carbimide; "cyanamide"; nitrolime
Molecular Formula: CCaN2
Molecular Weight: 80.10
Percent Composition: C 14.99%, Ca 50.03%, N 34.97%
Line Formula: NºCN=Ca
Literature References: Prepn: Kastens, McBurney, Ind. Eng. Chem. 43, 1020 (1951); Franck, Heimann, Angew. Chem. 44, 372 (1931); Owen, Trans. Faraday Soc. 57, 670 (1961); Dedman, Owen, ibid. 678.
Properties: Commercial grades may occur as grayish-black lumps of powder. While pure calcium cyanamide is nonvolatile and noncombustible, commercial grades may contain small amounts of calcium carbide which will produce acetylene in containers and processing vessels. Other contaminants are carbon, Ca(OH)2, CaO, and CaCO3. Pure calcium cyanamide occurs as glistening, hexagonal crystals belonging to the rhombohedral system. mp ~1340°; d420 2.29. Sublimes at 1150-1200°. Heat of formn from CaC2 + N2: -69.0 kcal/mole (25°). Heat of fusion 1.29 cal/g. Essentially insol in water, but undergoes partial hydrolysis to the sol calcium hydrogen cyanamide, a source of cyanamide ions. No known solvent will bring about soln without decompn.
Melting point: mp ~1340°
Density: d420 2.29
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, respiratory system; headache, vertigo, rapid breathing, low blood pressure, nausea, vomiting; skin burns and sensitization; cough; Antabuse-like effects. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 46.
Use: As fertilizer, defoliant, herbicide, pesticide; manuf and refining of iron; manuf of calcium cyanide, melamine, dicyandiamide.
Therap-Cat-Vet: Has been used as an anthelmintic.
Calcium Cyanamide Citrated Calcium Cyanide Calcium Cyclamate Calcium Dichromate(VI) Calcium D-Saccharate

Calcium cyanamide
Calcium cyanamide.png
CAS number 156-62-7 YesY
PubChem 4685067
ChemSpider 21106503 N
UNII ZLR270912W YesY
EC number 205-861-8
UN number 1403
RTECS number GS6000000
Jmol-3D images Image 1
Molecular formula CaCN2
Molar mass 80.102 g/mol
Appearance White solid (Often gray or black from impurities)
Odor odorless
Density 2.29 g/cm3
Melting point 1340 °C [1]
Boiling point 1150-1200 °C (sublim.)
Solubility in water Reacts
EU Index 615-017-00-4
EU classification Harmful (Xn)
Irritant (Xi)
R-phrases R22 R37 R41
S-phrases (S2) S22 S26 S36/37/39
NFPA 704
NFPA 704.svg
Flash point Non-flammable
Related compounds
Related compounds Cyanamide
Calcium carbide
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Calcium cyanamide or CaCN2 is a calcium compound used as fertilizer,[2] first synthesized in 1898 by Adolph Frank and Nikodem Caro (Frank-Caro process).[3] It is formed when calcium carbide reacts with nitrogen. It is commercially known as Nitrolime.

CaC2 + N2 → CaCN2 + C

The reaction takes place in large steel chambers. An electric carbon element heats the reactants to red heat. Nitrogen is pressurised at 2 atmospheres.

It crystallizes in hexagonal crystal system with space group R3m and lattice constants a = 3.67, c = 14.85 (.10−1 nm).[4]