Sodium diethylenetriamine pentamethylene phosphonate

Sodium diethylenetriamine pentamethylene phosphonate (CAS 22042-96-2) is a phosphonate chelating agent; also marketed as Dequest 2066.

Where is Sodium diethylenetriamine pentamethylene phosphonate used?

• Industrial water treatment: prevents calcium carbonate scale
• Cooling towers, boilers and reverse osmosis systems: prevents calcium sulfate and barium sulfate scale
• Oilfield injection and produced water circuits: suppresses mineral deposition
• Textile and leather processing: sequesters hardness ions in process baths, improving dye uptake and preventing metal-induced fabric damage
• Pulp and paper: stabilizes peroxide bleaching baths by deactivating trace metal ions
• It controls scale formation and inhibits corrosion under high-temperature or high-hardness conditions.

Good to know: Controls scale and inhibits corrosion where conventional phosphonates underperform, particularly under high-temperature or high-hardness conditions.

Commercial specifications

• Aqueous solution, typically around 20–30% active content
• Bulk supply in IBC containers and drums