Mainly used as solvent and organic synthesis intermediates, used for making gas purifying agent (CO2), lubricating oil additive, emulsifying agent, photographic chemicals, surface active agent, fabric finishing agents, paper strengthening agent, complexone, ash-free additives, metal, hydrometallurgy of heavy metals and chelating agent without cyanide electroplating diffusion agent, brightener, ion exchange resin and polyamide resin, etc