What is methylamine


Methylamines, the primary, secondary and tertiary methyl derivatives of ammonia. They are the simplest compounds from the series of aliphatic amines. Monomethylamine (Methylamine, Aminomethane), CH3-NH2; M.p. -93.5 ° C, b.p. -6.3 ° C. Dimethylamine, (CH3)2NH; M.p. -93 ° C, b.p. 7.4 ° C. Trimethylamine, (CH3)3N; M.p. -117.2 ° C, b.p. 2.9 ° C, nD.20 1,3631.

M. are flammable gases that smell like ammonia and dissolve well in water, alcohol, ether and glycols. Water-soluble methylammonium salts are formed with mineral acids. The action of nitrous acid on dimethylamine produces a yellow, poisonous nitrosamine. Trimethylamine and alkyl halides form trimethylalkylammonium salts.

Methylamines are very corrosive to the skin and mucous membranes. The effect of higher concentrations on the mucous membranes of the eyes can cause temporary or permanent blindness. Inhaling large amounts can lead to pulmonary edema.

M. occur as metabolic products in plants and animals. Mono- and trimethylamine are found in bone oil and in distillation products from wood. Di- and trimethylamines are also formed when proteins are broken down in yeast, cheese and fish. They are also found in herring brine and sugar beet molasses.

The M. is produced by reacting methanol and ammonia in the presence of aluminum oxide catalysts at pressures of 1.5Â · 106 to 3Â · 106 Pa and 350 to 450 ° C. The product mixture contains approximately 1 part monomethylamine, 2 parts dimethylamine and 7 parts trimethylamine, which can be separated by fractional distillation. M. are mainly used in the chemical and pharmaceutical industries. They are primarily used as intermediate products in the manufacture of dyes, pharmaceuticals and pesticides. Monomethylamine is also used in the production of textile auxiliaries, sarcosine and dimethylurea. From dimethylamine are dimethylformamide, dimethylacetamide, N,N-Dimethylethanolamine, vulcanization accelerators and quaternary ammonium salts accessible. It is also used as a depilatory in the leather industry and as a solvent for synthetic fibers. Trimethylamine is used in the manufacture of choline and choline salts, emulsifiers, disinfectants and quaternary ammonium salts.