BHMTPMPA: Scale Inhibitor for High-Hardness Water
BHMTPMPA — bis(hexamethylene triamine penta(methylene phosphonic acid)), CAS 34690-00-1 — is a high-molecular-weight (≈685 g/mol) chelating scale inhibitor with exceptional calcium tolerance across a wide pH range, ideal for high-hardness, high-alkalinity, high-cycle cooling water. Its many phosphonic groups give strong threshold inhibition at low phosphorus content, and it works in oilfield and boiler water too.
What is BHMTPMPA?
BHMTPMPA (molecular formula C₁₇H₄₄O₁₅N₃P₅, relative molecular mass ≈685) is a large, multi-nitrogen organic polyphosphonate — essentially two hexamethylene-triamine phosphonate units bridged together. That high molecular weight combined with many phosphonic groups gives outstanding chelation and threshold scale inhibition while keeping the total phosphorus lower than smaller phosphonates such as ATMP or HEDP. It is supplied as a liquid acid or partially neutralized sodium salt.
Why BHMTPMPA suits high-hardness, high-cycle water
BHMTPMPA has high calcium-ion tolerance over a wide pH range and heat tolerance to about 120 °C, and is very effective against carbonate and sulfate scale. Because it holds so much hardness in solution, it lets cooling systems run at higher cycles of concentration — saving make-up water and blowdown while its lower phosphorus contribution eases discharge compliance.
Applications of BHMTPMPA
- Circulating cooling water — high-hardness, high-alkalinity, high-cycle towers.
- Oilfield water — scale control in water injection and produced water.
- Boiler and other industrial systems needing strong chelation at low dosage.
BHMTPMPA dosage
BHMTPMPA is typically dosed at 1–15 ppm in cooling water; its strong chelation makes it effective at low dosage even in severe scaling conditions, and it is often blended with AA/AMPS or PAAS dispersants for a complete program.
BHMTPMPA vs ATMP and HEDP
| Property | BHMTPMPA | ATMP | HEDP |
|---|---|---|---|
| Molecular weight | High (≈685) | Low (299) | Low (206) |
| Total phosphorus | Lower | Higher | Higher |
| Calcium tolerance | Very high | Good | Good |
| Cycles of concentration | Higher | Moderate | Moderate |
| Heat tolerance | ~120 °C | Good | Better |
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Frequently asked questions
What is BHMTPMPA used for?
BHMTPMPA is a high-molecular-weight scale and corrosion inhibitor for high-hardness, high-alkalinity circulating cooling water, oilfield water and boilers. Its high calcium tolerance lets systems run at higher cycles of concentration.
What is the dosage of BHMTPMPA?
BHMTPMPA is typically dosed at 1–15 ppm in cooling water; because of its strong chelation it is effective at low dosage even in severe scaling conditions, and is often blended with AA/AMPS or PAAS dispersants.
How is BHMTPMPA different from ATMP and HEDP?
BHMTPMPA has a much higher molecular weight (≈685) and lower total phosphorus, with very high calcium tolerance — so it supports higher cycles of concentration and eases phosphorus-discharge limits, while ATMP and HEDP are lower-cost for general duty.
Does BHMTPMPA lower phosphorus discharge?
Yes. Its high molecular weight means less total phosphorus per unit of scale-inhibition performance, which helps sites meet phosphorus-discharge limits while running at high cycles of concentration.
Is VCYCLETECH a BHMTPMPA manufacturer?
Yes. VCYCLETECH manufactures BHMTPMPA factory-direct in China, ISO 9001/14001/45001 certified, with a COA on every batch, free samples and OEM/ODM service. Email sales@vcycletech.com for a quotation.
About the manufacturer
VCYCLETECH is a China-based manufacturer of water treatment chemicals — antiscalants, scale & corrosion inhibitors, coagulants, flocculants, biocides, dispersants and paper chemicals — ISO 9001 / 14001 / 45001 certified, with a COA on every batch and OEM/ODM service. See our quality & certifications.
References
- Phosphonates — Wikipedia
- Hard water & calcium scale — Wikipedia
- Cooling tower & cycles of concentration — Wikipedia
Related: BHMTPMPA product · All phosphonates · Cooling water treatment · Green antiscalants