Dimethylamine is used as a raw material to produce agents that remove suspended solids for water clarification in industrial and municipal raw, potable, and wastewater treatment plants. They are used to improve solid/liquid separation in sedimentation, filtration, and flotation operations.
Polyelectrolytic cationic flocculants made from DMA, such as dimethyldiallylammonium chloride (DMDAC) or epichlorohydrindimethylamine, are homopolymerized or copolymerized with acrylamide. Also, DMA can be reacted with formaldehyde and polyacrylamide to make Mannich polymers. These polymers can be quarternized with dimethyl sulfate or methyl chloride to improve their performance at high pHs. Dimethylaminoethanol (DMAE) methacrylate-acrylamide copolymers are also used as cationic flocculants.