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Amino Trimethylene Phosphonic Acid, ATMP Chemical

Production Info:

The three main raw materials for ATMP production are phosphorous acid, ammonium chloride, and formaldehyde. The first two are added into the reactor and heated and stirred until dissolved completely.

Then, formaldehyde will be dropwise. Phosphorus acid can be from the hydrolysis of PCl3 or the production of other chemicals. If chlorine content needs to be lower than the normal specs, the steam-heating time will be extended.

CAS No.: 6419-19-8

Molecular Formula: N(CH2PO3H2)3

Molecular Weight: 299.05

Structural Formula:



Amino trimethylene phosphonic acid has excellent chelation. Its threshold inhibition is low and chemical stability is high. ATMP is an excellent antiscalant and chelating agent to most metal ions like Ca, Ba, Mg, Fe and Pb, especially Calcium Carbonate (CaCO3). In the water system, it is difficult to hydrolyze and can distort the lattice. In a higher concentrated system, ATMP is also a good corrosion inhibitor.

ATMP acid is used in industrial circulating cool water system of thermal power plant and oil refinery plant. ATMP can decrease scale formation and inhibit the corrosion of metal equipment and pipeline. ATMP acid can be used as a chelating agent in woven and dyeing industries and as a metal surface treatment agent.

Usually, it is compounded with organophosphorus acid/salt, polycarboxylic acid/salt. Amino trimethylene phosphonic acid solid as crystal powder can also be supplied for cold areas, particularly in water. It is easy to dissolve. ATMP is suitable for usage in winter and freezing districts. Because of its high purity, ATMP can be used in woven & dyeing industries and as a metal surface treatment agent.


AppearanceColorless or pale yellow transparent liquid White crystal powder
Active Acid, %48.0-52.095 Min.
Chloride (as Cl-), %2.0 Max.1.0 Max.
pH (1% Solution)2.0 Max.2.0 Max.
Fe, mg/L20.0 Max.20.0 Max.
Density (20℃), g/cm31.30 Min.-
Colour APHA (Hazen)40 Max.-


ATMP is usually used together with organophosphorus acid, polycarboxylic acid, and salt to built all organic alkaline water treatment chemicals. Amino trimethylene phosphonic acid is broadly applied in recirculated cooling water systems for the power station, oil field, and central air-conditioning, etc.

It is also used in the woven and dyeing industry. As an antiscalant and chelating agent, the recommended dosage is 1-20mg/L. This will increase to 20-60mg/L is used as a corrosion inhibitor.

Package and Storage:

Liquid: 200L plastic drum, IBC (1000L), customers’ requirement. Solid: 25kg/bag, customers’ requirement Storage for ten months in a shady room and dry place.

Safety Protection:

Acidity, Avoid contact with eye and skin, once contacted, flush with water.

Transport Info:

Corrosive. IMO class 8, UN 3265.

Synonyms: ATMPA, ATMP(A), Tris(Methylene Phosphonic Acid) Amine, Dequest 2000, Mayoquest 1320, Belclene 640, Unihib 305, Excel Codex 8503, Briquest 301-50A.