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Solvents

(Mono- and Dimethylamine)

Solvents are the biggest use for dimethylamine (DMA) and a growing use for monomethylamine (MMA). They are used to make the polar, aprotic solvents dimethylformamide (DMF), dimethylacetamide (DMAc), and n-methylpyrrolidone (NMP).

DMF is made from the reaction of DMA and carbon monoxide or methyl formate. Its uses include urethane coatings, spinning solvent (primarily for acrylics), reaction solvent, extraction solvent (such as butadiene extraction), and processing solvent (including solvent for dicyandiamide for epoxy-laminated printed circuit boards).

DMAC is made from the reaction of DMA and acetic acid or acetic anhydride. It is also used as a spinning solvent and reaction solvent as well as for the manufacture of dyes, pharmaceuticals, and vinyl polymers.

NMP uses MMA reacted with gammabutyrolactone. Its varied uses include reaction solvent (engineering resins), extraction solvent (lube oil refining), spinning solvent, paint stripper (replacing methylene chloride), electronics (for strippers and cleaners), and enamel coatings (magnet wire with polyamide/imide resins).

MMA is also used for extractive distillation of butylene and butadiene by forming an azeotrope with butylene. DMA can be reacted with phosphorous trichloride in the presence of trimethylamine to make tris-(dimethylamido)-phospate. This has been used to dissolve polyacrylonitrile, as a solvent for polyvinylidene chloride, and as a selective solvent for acetylene.