Methylamine: CH3NH2 Properties: Also known as monomethylamine, it is a colorless gas or liquid with an ammonia odor at room temperature. It is flammable, and its vapor can form an explosive mixture with air, with explosion limits of 5%-21% (4.95%-20.75%). Relative density 0.662, melting point -93.5℃, boiling point -6.3～-6.7℃, -19.7℃ (53.3kPa), -32.4℃ (26.7kPa), -43.7℃ (13.3kPa), -73.8℃ (1.33kPa), decomposition temperature 250℃, flash point (closed cup) 0℃, autoignition point 430℃, vapor pressure (25℃) 202.65Pa, critical temperature 156.9℃, critical pressure 4.073kPa, refractive index 1.351. It produces fumes after liquefaction and is more alkaline than ammonia. Easily soluble in water, ethanol, and ether.
Ethylamine: CH3CH2NH2 A colorless liquid or gas with a strong ammonia odor; vapor pressure 53.32 kPa/20℃; flash point: <-17.8℃; melting point -80.9℃; boiling point 16.6℃; solubility: soluble in water, ethanol, ether, etc.; density: relative density (water=1) 0.70; relative density (air=1) 1.56; stability: stable; hazard markings: 4 (flammable gas), 14 (toxic substance); main uses: used in dye synthesis and as an extractant, emulsifier, pharmaceutical raw material, reagent, etc.
