Methylamine, aqueous solution

  • Monomethylamine
  • Methanamine
  • Aminomethane
Formula
CH3NH2
Structure
Description
A colorless gas or a liquid. Pungent fishy odor resembling odor of ammonia.
Uses
Used in organic synthesis, tanning.

Registry Numbers and Inventories.
CAS
74-89-5
EC (EINECS/ELINCS)
200-820-0
EC Index Number
612-001-01-6
EC Class
Extremely flammable; Harmful; Corrosive
R 12 20/22 34
S 3 16 26 29 36/37/39 45
RTECS
PF6300000
RTECS class
Mutagen; Primary Irritant
UN (DOT)
1235
Merck
12,6095
Beilstein/Gmelin
741851
Beilstein Reference
4-04-00-00118
Swiss Giftliste 1
G-2423
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
CH5N
Formula mass
31.06
Melting point, °C
-38
Boiling point, °C
48
Vapor pressure, mmHg
485 (20 C)
Vapor density (air=1)
1.07
Odor Threshold Odor threshold 10 ppm
Critical temperature
157
Critical pressure
73.6
Density
0.900 g/cm3 (20 C)
Solubility in water
Soluble
Viscosity
0.186 cP (liquid)
Surface tension
19.19 g/s2 at 25 C
Refractive index
1.37 (20 C)
pKa/pKb
3.34 (pKb)
Partition coefficient, pKow
-0.57
Heat of fusion
6.14 kJ/mol
Heat of vaporization
23.4 kJ/mol
Heat of combustion
-1086 kJ/mol

Hazards and Protection.
Storage
Outdoor or detached preferred. Insure against accidental contact with mercury. Keep well closed.
B2 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.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. 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). Water spill: Use natural barriers or oil spill control booms to limit spill travel. Use surface active agent (e.g. detergent, soaps, alcohols), if approved by epa. Inject universal gelling agent to solidify encircled spill and increase effectiveness of booms.
Stability
Stable, liquid solutions are flammable. Vapor forms explosive mixtures with air. Contact with mercury can produce explosive reaction.
Incompatibilities
Oxidizing agents, acids, aluminum, copper, copper alloys, halogenated agents, perchlorates, zinc, mercury, nitromethane, chlorine, hypochlorite, zinc alloys.
Decomposition
Nitrogen oxides, carbon monoxide, carbon dioxide, ammonia and/or derivatives, amines.

Fire.
Flash Point,°C
-40
Autoignition, °C
430
Upper exp. limit, %
20.7
Lower exp. limit, %
4.9
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
FLAMMABLE.
Hazards
POISONOUS GASES MAY BE PRODUCED IN FIRE. Containers may explode in fire. Flashback along vapor trail may occur. Vapor may explode if ignited in an enclosed area. Toxic nitrogen oxides may be formed. Vapors are heavier than air and may travel considerable distance to a source of ignition and flash back.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
4
 
 
Reactivity
0
 

Health.
Poison_Class
2
Exposure effects
Repeated or prolonged exposure may result in liver disorders and/or adverse effects to respiratory system (like bronchopneumonia), eyes or skin. Effects may be delayed.
   Ingestion
Harmful if swallowed. Causes gastrointestinal tract burns.
   Inhalation
Causes chemical burns to the respiratory tract. May cause pulmonary edema and severe respiratory disturbances. May cause liver abnormalities. Inhalation of methylamine may cause coughing, nausea and pulmonary edema. Allergic or chemical bronchitis was reported in a worker exposed to methylamine in an unpublished report. It is unclear from this report what the actual exposure concentrations were.
   Skin
Causes skin burns. May be absorbed through the skin. May cause dermatitis. Methylamine is readily absorbed through the skin and may cause malaise, discomfort, injury and death unless treated promptly.
   Eyes
Causes eye burns. May result in corneal injury. May cause chemical conjunctivitis and corneal damage. May cause tearing, conjunctivitis and corneal edema when vapor is absorbed into the tissue of the eye.

First aid
 
   Ingestion
DO NOT INDUCE VOMITING. Corrosive chemicals will destroy the membranes of the mouth, throat, and esophagus and volatile chemicals have a high risk of being aspirated into the victim's lungs during vomiting. Thus, the risk of increasing the medical problems by inducing vomiting of a volatile corrosive chemical is very high. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. IMMEDIATELY transport the victim to a hospital.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
1235
Response guide
Hazard class
2.3
USCG CHRIS Code
MSZ
 
7 Aliphatic amines
Std. Transport #
4907840
 
IMO Pollution Category
(C MSZ)
IMO Hazard code
(S/P MSZ)