Tetra Sodium Salt of Amino Trimethylene Phosphonic Acid (ATMP.Na4)

Tetra Sodium Salt of Amino Trimethylene Phosphonic Acid (ATMP·Na₄) is the fully neutralized sodium salt of ATMP, offering a ready-to-use, pre-neutralized form with a near-neutral pH.

🔬 Key Properties & Specifications
Property Details
CAS Number 20592-85-2
Molecular Formula C₃H₈NO₉P₃Na₄
Molecular Weight ~387
Appearance Colorless to light yellow transparent liquid
Active Content (as ATMP) 29.4% – 32.4%
Active Content (as ATMP·Na₄) 38.0% – 42.0%
pH (1% solution) 6.0 – 8.0 (near neutral)
Density (20°C) 1.35 – 1.45 g/cm³
⚙️ Core Functions & Mechanism
ATMP·Na₄ functions as a highly effective scale inhibitor and chelating agent, with its performance driven by its phosphonic acid groups.

Scale Inhibition: It is particularly effective at inhibiting calcium carbonate (CaCO₃) scale formation. Under NACE testing protocols, the ATMP scaffold (its acid form) ranks #1 in CaCO₃ inhibition performance, outperforming HEDP and various phosphorus-free polymers. It works by interfering with crystal growth and, at higher dosages, promotes the formation of aragonite—a less adhesive crystalline form—over calcite.

Chelation & Dispersion: It chelates metal ions (e.g., calcium, magnesium) to keep them in solution, preventing them from forming insoluble scale deposits.

Corrosion Inhibition: In synergistic formulations, particularly with zinc salts, it provides good corrosion protection for carbon steel. One study showed ATMP reduced carbon steel corrosion by 87% compared to a blank in treated wastewater. It has also been reported to offer excellent steel corrosion inhibition.

🏭 Key Application Areas
ATMP·Na₄ is a versatile product used across multiple industrial sectors:

Application Area Specific Uses
Industrial Water Treatment Scale and corrosion inhibitor in circulating cooling water systems (power plants, refineries), oilfield injection water systems, and reverse osmosis membranes.
Boiler Water Treatment Used to treat boiler scale, particularly in high-temperature and high-alkali conditions (often combined with products like EDTMP·Na5).
Detergent Formulations Used as a chelating agent to enhance the cleaning power of liquid alkali, especially under high-temperature and high-alkali conditions.
Other Industries Applicable in metal surface treatment for descaling and corrosion prevention, as well as in the paper and textile industries.
📈 Key Advantages
Pre-Neutralized & Convenient: Unlike acidic ATMP, ATMP·Na₄ is a salt that provides a consistent dissolution pH and is easier to handle, generating no ammonia odor in neutral to acidic conditions.

Excellent Compatibility: It has good synergistic effects with other additives, including organophosphonic acids, polycarboxylic acids, and zinc salts.

High Calcium Tolerance & Iron Control: It offers good calcium tolerance and effective iron control in water systems.

Superior CaCO₃ Inhibition: As noted, it is a top performer in comparative studies for CaCO₃ scale inhibition.

⚙️ Usage & Handling
Recommended Dosage: Typically used at a dosage of 3–15 mg/L in circulating cooling water systems, often formulated with other water treatment chemicals.

Safety & Handling:

ATMP·Na₄ is mildly irritating to skin and eyes, though less so than the acid form.

Use appropriate protective equipment (gloves, goggles) during handling. In case of contact, flush with plenty of water.

It is very toxic to aquatic life. While it is of low acute toxicity to fish (LC₅₀ ≥ 250 mg/L), it can show effects on algae and aquatic invertebrates.

Storage: Store in a cool, dry, and well-ventilated place, away from direct sunlight and moisture. The typical shelf life is 10–12 months in original sealed containers.

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