Polyamine is an organic compound that has more than two amino groups. Alkyl polyamine occurs naturally, but some are synthetic. Alkyl polyamines are colorless, hygroscopic, and soluble in water. Near neutral pH, they exist as ammonium derivatives. Most aromatic polyamines are crystalline solids at room temperature.
Polyamine is a kind of organic coagulant which can be applied together with inorganic coagulant such as PAC Alum etc. Its applications include: water treatment, wastewater treatment, paper industry, textile, mining, oil field, etc.