Methylamine solution , ~30wt.%inH2O , 74-89-5
Synonym(s):
Monomethylamine
CAS NO.：74-89-5
Empirical Formula: CH5N
Molecular Weight: 31.06
MDL number: MFCD00008104
EINECS: 200-820-0
PRODUCT Properties
| Melting point: | -93 °C(lit.) |
| Boiling point: | -6.3 °C(lit.) |
| Density | 0.785 g/mL at 25 °C |
| vapor density | 1.08 (20 °C, vs air) |
| vapor pressure | 27 psi ( 20 °C) |
| refractive index | n |
| Flash point: | 61 °F |
| storage temp. | Store below +30°C. |
| solubility | highly soluble in water (108g/100g) at 25°C; soluble in alcohol and
miscible with ether; HCl salt is soluble in water and absolute alcohol; compound
is insoluble in chloroform, acetone, ether, and ethyl acetate |
| pka | 10.63(at 25℃) |
| form | Gas |
| Specific Gravity | 0.901 (20℃/4℃) (40% Soln.) |
| PH | 14 (H2O, 20°C) |
| explosive limit | 4.9-20.8% |
| Odor Threshold | 0.035ppm |
| Water Solubility | Miscible with water, ethanol, benzene, acetone and ether. |
| Merck | 14,6014 |
| BRN | 741851 |
| Henry's Law Constant | (x 10-5 atm?m3/mol):
1.11 at 25 °C (Christie and Crisp, 1967) |
| Exposure limits | TLV-TWA 10 ppm (～12.3 mg/m3)(ACGIH,
MSHA, and OSHA); IDLH 100 ppm
(NIOSH). |
| Dielectric constant | 10.0（18℃） |
| Stability: | Stable. Highly flammable. Note wide explosion limits. Incompatible with oxidizing agents, acids, alkalies, alkaline earth metals, copper and its alloys, zinc and its alloys. |
| LogP | -0.570 |
Description and Uses
Methylamine is a colorless gas with a fish- or ammonia-like odor; at low concentrations a fishy odor. Shipped as a liquefied compressed gas. The odor threshold is 3.2 ppm. Molecular weight= 31.07; Specific gravity (H2O:1)= 0.7 (liquid);Boiling point=6℃; Freezing/ Melting point=94℃; Relative vapor density (air= 1)= 1.08; Vapor pressure= 3 atm; Flash point=flammable gas; Autoignition temperature=430℃. Explosive limits: LEL= 4.9%; UEL= 20.7%. Hazard Identification (based on NFPA-704 M Rating System): Health 3, Flammability 4, Reactivity 0. Soluble in water.
Methylamine is used in dyeing and tanning;in photographic developer, as a fuel additive,and as a rocket propellant. It is also usedin organic synthesis and as a polymerizationinhibitor. It occurs in certain plants, such asMentha aquatica.
Safety
| Symbol(GHS) |    GHS02,GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H225-H314-H335 |
| Precautionary statements | P210-P233-P240-P280-P303+P361+P353-P305+P351+P338 |
| Hazard Codes | F+,Xn,C,F,T |
| Risk Statements | 12-20-37/38-41-34-20/22-11-39/23/24/25-36/37/38-23/24/25-40-19 |
| Safety Statements | 7-16-26-36/37-45-29-36/37/39-3/7-3-39-33 |
| OEB | A |
| OEL | TWA: 10 ppm (12 mg/m3) |
| RIDADR | UN 3286 3/PG 2 |
| WGK Germany | 2 |
| RTECS | PF6300000 |
| F | 4.5-31 |
| Autoignition Temperature | 806 °F |
| TSCA | Yes |
| DOT Classification | 2.1 (Flammable gas) |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29211100 |
| Toxicity | LD50 orally in rats: 100-200 mg/kg (Kinney); LC50 in rats: 0.448 ml/l (Sarkar, Sastry) |
| IDLA | 100 ppm |
