Physical and Chemical Properties of Amino Trimethylene Phosphonic Acid (ATMP)

Amino trimethylene phosphonic acid (ATMP)

[Structural formula]

Amino trimethylene phosphonic acid is abbreviated as ATMP, which is a cathodic corrosion inhibitor.
Its monomer structure has 3 phosphonic acid groups, which can dissociate into 6 positive ions and 6 negative ions in water, and can interact with calcium and magnesium.
The other metal ions form multiple chelate compounds and are dispersed in the water in a loose form, which destroys the normal crystallization of calcium scale and magnesium scale
.

[Physical and chemical properties] Colorless or slightly yellow transparent liquid, or white granular solid, easily soluble in water, low toxicity or non-toxic, good thermal stability, good chemical stability, not easy to be damaged by acid and alkali, and also It is not easy to hydrolyze, has good chelating solubilization, low-limit inhibition and lattice distortion, and can prevent various inorganic salts in water from forming hard scales
.

[Preparation]

(1) It is prepared by the reaction of formaldehyde , ammonium chloride , phosphorus trichloride and water at a certain temperature.
The reaction formula is as follows:

Add the metered ammonium chloride and water into the reaction kettle, turn on the stirrer to mix them, and slowly add phosphorus trichloride and formaldehyde
.

(2) The reaction between triacetoxyamine and phosphorous acid has a high yield, good product quality, and raw materials are rare, and the cost is relatively high
.

N[CH ₂ COOH] ₃ +3H ₃ PO ₄ →N[CH ₂ PO(OH) ₂ ] ₃ +CO ₂ +3H ₂ O

[Technical Standard]HG/T2841-2005

Related Links: Application of Ethylenediamine Tetramethylene Phosphonic Acid (EDTMP)