Malononitrile

  • Propanedinitrile
  • Methylene cyanide
  • Dicyanomethane
  • Cyanoacetonitrile
Formula
NCCH2CN
Structure
Description
A white-colored crystalline solid.
Uses
Organic synthesis, leaching agent for gold.

Registry Numbers and Inventories.
CAS
109-77-3
EC (EINECS/ELINCS)
203-703-2
EC Index Number
608-009-00-7
EC Class
Toxic; Dangerous for the Environment
R 23/24/25 50/53
S 23 27 45 60 61
RTECS
OO3150000
RTECS class
Primary Irritant
UN (DOT)
2647
Merck
13,5733
Beilstein/Gmelin
773697
Beilstein Reference
4-02-00-01892
RCRA
U149
Swiss Giftliste 1
G-2381
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H2N2
Formula mass
66.06
Melting point, °C
30 - 32
Boiling point, °C
220
Vapor pressure, mmHg
0.13 (25 C)
Vapor density (air=1)
2.3
Density
1.191 g/cm3 (20 C)
Solubility in water
130 g/L
Viscosity
2.85 cp (32.7 C)
Surface tension
47.9 g/s2 (36 C)
Refractive index
1.41259 (34.2 C)
pKa/pKb
11.40 (pKa)
Partition coefficient, pKow
-0.60
Heat of fusion
10.0 kJ/mol
Heat of vaporization
45.5 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Disposal code
9
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents - strong acids - strong bases - strong reducing agents.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.

Fire.
Flash Point,°C
112
Autoignition, °C
365
Upper exp. limit, %
19
Lower exp. limit, %
2.9
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.
Fire potential
Combustible when exposed to heat or flame.
Hazards
When heated to decomposition, malononitrile emits highly toxic fumes (cyanide). May polymerize violently on prolonged heating. Avoid heat. Hazardous polymerization may occur, at prolonged heating at 266F or contact with strong bases at lower temperatures.
Combustion products
When heated to decomposition it emits toxic fumes of nox and cn- nitrogen oxides and cyanides.
Health
2
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
NIOSH REL: TWA 3 ppm (8 mg/m3)
Poison_Class
2
Exposure effects
Part of the initial presentation of cyanide poisoning may be hyperpnea and rapid breathing. Hypoventilation progressing to apnea may be seen in the later phases of cyanide poisoning and is a major cause of death. Rapid heart rate and elevated blood pressure may be seen in the initial phases of cyanide poisoning. Low heart rate and abnormally low blood pressure are seen in the late phases of cyanide poisoning. When malononitrile was administered to humans intravenously for the treatment of mental illness in doses of 1 to 6 milligrams/kilogram, rapid heart rate was noted. Headache, CNS stimulation with anxiety, agitation, and combative behavior, coma, and seizures may be seen.
   Ingestion
Harmful if swallowed. Causes digestive tract irritation.
   Inhalation
Not available.
   Skin
Causes skin irritation. Harmful if absorbed through the skin.
   Eyes
Not available.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
2647
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
PPD
 
HS Code
2926 90 95
 
Std. Transport #
4921590