Bis(hexamethylene)triaminopenta(methylene-phosphonic acid) is used as an intermediate in the manufacture of disperse dyes, alizarin, and vat dyes, and can also be used as a raw material for plastics and insulating materials. BHMTPh·PN(Nax) is a highly efficient chelating scale inhibitor with good scale inhibition effects on carbonate and sulfate scales. It has excellent water solubility and thermal stability over a wide pH range and at a high temperature of 120°C, and has high tolerance to calcium ions.