Penta Sodium Salt of Amino Trimethylene Phosphonic Acid (ATMP.Na5)

ATMP·Na5 (the pentasodium salt of Amino Trimethylene Phosphonic Acid) is a high-performance, cost-effective scale inhibitor and chelating agent, valued for its h3 efficacy against calcium carbonate scale and its good compatibility with other treatment chemicals in alkaline water systems.

Here is a summary of its key chemical properties and characteristics:

​Basic Identity and Form

Chemical Name: Penta Sodium Salt of Amino Trimethylene Phosphonic Acid

CAS Numbers: 2235-43-0 (for the 5-Na salt); 20592-85-2 (for X-Na salt, a common commercial form)

Molecular Formula: C₃H₇NO₉P₃Na₅

Molecular Weight: 409

Typical Appearance: Colorless or light yellow, transparent aqueous solution

Typical Technical Specifications (as a 38-42% solution)

The following data are based on typical commercial product specifications:

Main Functions and Applications

As a sodium salt of ATMP, this product is designed for convenient handling and use in alkaline formulations. Its core functions are:

Scale Inhibition: It is particularly effective at preventing the formation of calcium carbonate scale in water systems. Research also indicates that the parent acid (ATMP/NTMP) is highly effective at inhibiting gypsum (calcium sulfate) scale, a function where similar compounds like HEDP show no effect.

Corrosion Inhibition: It provides good corrosion protection for metal surfaces, especially when used in combination with zinc salts and phosphates.

Chelation: It has h3 chelating properties, meaning it can bind to metal ions in water, preventing them from participating in scale-forming reactions.

Due to these properties, ATMP·Na5 is widely used in:

Industrial Water Treatment: In circulating cooling water systems, boiler water treatment, and power plants.

Oilfield Operations: For scale control in oil refinery plants and oilfield refill water systems.

Other Industrial Applications: Such as in detergents, textile bleaching, and as a sequestering agent.

Practical Application Notes

Usage: It is typically used in conjunction with other organic phosphonic acids, polycarboxylic acids, or salts to form comprehensive alkaline water treatment formulations.

Storage: It has a shelf life of 10 to 12 months when stored in a cool, dry place.

Safety: As a weak alkaline solution, it should be handled with care. Avoid contact with eyes and skin; flush with plenty of water if contact occurs.