DMAC purification

DMAC is mainly used as a solvent, for example, as a solvent for solution spinning of an elastic polyurethane block copolymer and a solvent for producing hollow fibers, which are known under the trademarks Spandex(R) or Lycra(R).

In order to be able to obtain high quality fibers by solution spinning, some specifications are required for the dimethylacetamide used here with a water content of <100 ppm, a pH between 6.5 and 7, and a specific conductivity of <0.6 μS/cm, or <0.2 μS/ Cm. Pure DMAC produces a significant electrical conductivity by its impurity content, such as an acid, particularly acetic acid; and a salt, especially an amine salt of acetic acid. The specification of pure dimethylacetamide relative to pH and conductivity corresponds to an acetic acid content of less than 50 ppm by weight.

① Used as a raw material for synthetic fibers and an excellent polar solvent for organic synthesis; used in organic synthesis, and also used as a solvent, catalyst and paint remover;

②DMAC is mainly used as a solvent for synthetic fiber (acrylonitrile) and polyurethane spinning and synthetic polyamide resin. It is also used as an extraction distillation solvent to separate styrene from the C8 fraction, and is widely used in polymer films; coatings and medicines, etc. . It is currently widely used in medicine and pesticides to synthesize antibiotics and pesticides.

③Can be used as a reaction catalyst; electrolytic solvent; paint remover and a variety of crystalline solvent adducts and complexes.

④ Used as solvent, paint remover, catalyst and in organic synthesis.