Application and synthesis methods of Trimethylamine

Physical and chemical properties

Relative density ：0.6709 (0/4 ℃),

Melting point ：-117 ℃, boiling point 3.2-3.8 ℃,

Vapor pressure ：(× 103Pa), 13.332 (-40.3 ℃), 191.0 (20 ℃).

Refractive index ：1.36 Chemicalbook31 (0 ℃).

Flash point ：-6 ℃

Application

Used as disinfectants, natural gas alarm agents, analytical reagents, and organic synthesis materials, as well as raw materials for pharmaceuticals, pesticides, photographic materials, rubber additives, explosives, chemical fiber solvents, surfactants, and dyes.

synthesis methods

The crude mixed methylamine was prepared by reacting methanol and ammonia (1:2.5) at high temperature (420 ℃) and high pressure (4900kPa) using activated alumina as a catalyst, and then fractionated to obtain trimethylamine. Formaldehyde can be used as a raw material for small-scale production. During production, ammonium chloride is added to the reaction pot, and formaldehyde is added dropwise while heating up. The distillate is collected until the temperature reaches 148 ℃, which is the endpoint of the methylation reaction. Discharge and obtain trimethylamine hydrochloride ([593-81-7]). Steam out the formaldehyde solution for later use. Mix trimethylamine hydrochloride with sodium hydroxide solution and heat to 80 ℃ to release trimethylamine gas.