Dimethylamine, anhydrous

  • N-Methylmethanamine
  • N,N-Dimethylamine
Formula
(CH3)2NH
Structure
Description
A colorless gas smelling of fish at low concentrations and of ammonia at higher concentrations.
Uses
Accelerator in vulcanizing rubber, tanning, manufacture detergent soaps, attracting boll weevils to exterminate them former use, reagent for magnesium.

Registry Numbers and Inventories.
CAS
124-40-3
EC (EINECS/ELINCS)
204-697-4
EC Index Number
612-001-01-9
EC Class
Extremely flammable; Harmful; Corrosive
RTECS
IP8750000
RTECS class
Mutagen; Primary Irritant
UN (DOT)
1032
Merck
12,3278
Beilstein/Gmelin
605257
Beilstein Reference
4-04-00-00128
RCRA
U092
Swiss Giftliste 1
G-1555
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C2H7N
Formula mass
45.08
Melting point, °C
-92.8
Boiling point, °C
6.9
Vapor pressure, mmHg
1520 (20 C)
Vapor density (air=1)
1.6
Evaporization number
>1 (butyl acetate=1)
Odor Threshold Odor threshold 47 ppb
Critical temperature
164
Critical pressure
52.7
Density
0.938 g/cm3
Solubility in water
237 g/L
Viscosity
1.7 cp @ 15.5C
Surface tension
26.34 g/s2 @ 25 C
Refractive index
1.350 (17C)
Dipole moment
1.01 D
Dielectric constant
5.26 (25 C)
pKa/pKb
3.27 (pKb)
Partition coefficient, pKow
-0.38
Thermal expansion
0.0018/K at 20 C
Heat of fusion
5.9 kJ/mol
Heat of vaporization
25.1 kJ/mol
Heat of combustion
-1744 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Do not store in direct sunlight. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.
A B1 E
Handling
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed. All five-gallon pails and larger metal containers, including tank cars and tank trucks, should be grounded and/or bonded when material is transferred.
Protection
Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Respirators
Recommendations are based on maximum exposure concentrations. 250 ppm Any supplied-air respirator. 500 ppm Any self-contained breathing apparatus with a full facepiece. Any supplied-air respirator with a full facepiece. Escape - Any air-purifying respirator with a full facepiece and a canister providing protection against this substance. Any appropriate escape-type, self-contained breathing apparatus. For Unknown Concentrations or Immediately Dangerous to Life or Health - Any supplied-air respirator with full facepiece and operated in a pressure-demand or other positive-pressure mode in combination with a separate escape supply. Any self-contained breathing apparatus with a full facepiece.
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors. Vapor knockdown water is corrosive or toxic and should be diked for containment. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash, cement powder, or commercial sorbents. Neutralize with sodium bisulfate (NaHSO4).
Stability
Vapor forms explosive mixtures with air. Highly reactive. Contact with mercury can produce an explosive reaction.
Incompatibilities
Reacts violently with acids, acrylaldehyde, maleic anhydride, oxidizing agents, mercury, some metals, chlorine, fluorine, nitrates, nitric acid, permanganates, halogens, and peroxides. Incompatible with aluminum, tin, copper, galvinized iron, and zinc.
Decomposition
Products of decomposition include carbon monoxide, carbon dioxide, hydrocarbons and toxic oxides of nitrogen as well as toxic amine vapors.

Fire.
Flash Point,°C
-18
Autoignition, °C
400
Upper exp. limit, %
14.4
Lower exp. limit, %
2.8
Fire fighting
Move container from fire area if it can be done without risk. Cool containers with water spray until well after the fire is out. Stay away from the ends of tanks. For fires in cargo or storage area: If this is impossible then take the following precautions: Keep unnecessary people away, isolate hazard area and deny entry. Let the fire burn. Withdraw immediately in case of rising sound from venting safety device or any discoloration of tanks due to fire. For tank, rail car or tank truck: Let burn unless leak can be stopped immediately. For smaller tanks or cylinders, extinguish and isolate from other flammables. Evacuation radius: 800 meters (1/2 mile). Do not attempt to extinguish fire unless flow of material can be stopped first. Flood with fine water spray. Do not scatter spilled material with high-pressure water streams. Cool containers with water spray until well after the fire is out. Apply water from a protected location or from a safe distance. Avoid inhalation of material or combustion by-products. Stay upwind and keep out of low areas. Stop flow of gas.
Fire potential
Severe fire hazard. Moderate explosion hazard.
Hazards
Flashback along vapor trail may occur. May explode if ignited in an enclosed area. Vapors are eye, skin and respiratory irritants.
Combustion products
Toxic gases and vapors (such as oxides of nitrogen and carbon monoxide) may be released in a fire.
Health
3
 
Flammability
4
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV (as TWA): 10 ppm; 18 mg/m3 (ACGIH 1992-1993). MAK: 10 ppm; 18 mg/m3; (1992). OSHA PEL: TWA 10 ppm (18 mg/m3) NIOSH REL: TWA 10 ppm (18 mg/m3) NIOSH IDLH: 500 ppm
Poison_Class
3
Exposure effects
Chronic ingestion may cause liver damage.
   Ingestion
Causes gastrointestinal tract burns. May cause liver damage. May be harmful if swallowed.
   Inhalation
Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.
   Skin
Severe skin irritation and/or burns may occur.
   Eyes
Causes eye burns. May result in corneal injury. Lachrymator.

First aid
 
   Ingestion
Do NOT induce vomiting. 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
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
1032
Response guide
Hazard class
2.1
USCG CHRIS Code
DMA
 
7 Aliphatic amines
Std. Transport #
4907820
 
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
S/P