Amino Trimethylene Phosphonic Acid (ATMP) 6419-19-8
Product description
Amino Trimethylene Phosphonic Acid (ATMP) is one of the most widely used organophosphonates in industrial water treatment. Its structure consists of a central nitrogen atom bonded to three phosphonic acid groups ($-\text{CH}_2\text{PO}_3\text{H}_2$), giving it exceptional chelating ability and strong threshold scale inhibition properties.
Technical Specifications
| Items | Index | |
|---|---|---|
| Standard | Solid | |
| Appearance | Clear, Colorless to pale yellow aqueous solution | White crystal powder |
| Active content, % | 50.0min | 95.0min |
| Chloride (as Cl-), % | 1.0 max | 1.0 max |
| pH (1% water solution) | 2.0 max | 2.0 max |
| Fe, mg/L | 20.0max | 20.0max |
| Density (20℃), g/cm3 | 1.30 min | - |
Key Features & Mechanisms
- Threshold Effect: ATMP operates far below stoichiometric ratios. Even at very low dosages (sub-ppm to a few ppm), it adsorbs onto active crystal growth sites, distorting the crystal lattice and stopping calcium carbonate scale from hardening onto equipment walls.
- Multi-Ion Chelation: It forms stable hexadentate complexes with divalent and trivalent metal ions like $\text{Ca}^{2+}$, $\text{Mg}^{2+}$, $\text{Fe}^{3+}$, and $\text{Zn}^{2+}$, keeping them solubilized.
- Corrosion Inhibition: Works synergistically with zinc salts and chromates/molybdates to form a thin, protective passivating film on carbon steel surfaces.
- Limitation (Chlorine Sensitivity): Unlike HEDP or PBTC, ATMP is vulnerable to degradation by free chlorine and oxidizing biocides, which cleave the central $\text{C}-\text{N}$ bond.
Primary Applications
1. Industrial Circulating Cooling Water
- Used as a primary scale and corrosion inhibitor in thermal power plants, petroleum refineries, and HVAC cooling towers operating under moderate water hardness and alkalinity.
2. Boiler & Oilfield Water Systems
- Oilfield Injection: Prevents calcium scale formation in produced water and reinjection wells.
- Low-Pressure Boilers: Controls scale deposits on heat exchanger tubes, often blended with polycarboxylic acid dispersants (like PAA or MA/AA).
3. Textile Processing & Bleaching
- Serves as a chelating stabilizer in hydrogen peroxide bleaching baths, complexing trace heavy metal ions ($\text{Fe}^{3+}, \text{Cu}^{2+}$) that otherwise trigger catalytic decomposition of peroxide and damage fabric fibers.
4. Detergent & Metal Finishing
- Functions as a metal cleaning agent, scale builder, and de-rusting additive in heavy-duty industrial cleaners and printed circuit board (PCB) processing baths.
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